Walk-Through Metal Detector Standard for Public Safety - JustNet

U.S. Department of Justice Office of Justice Programs National Institute of Justice

Walk-Through Metal Detector Standard for Public Safety

NIJ Standard-0601.03 January 2011 NCJ xxxxx

U.S. Department of Justice Office of Justice Programs National Institute of Justice

John H. Laub Director

Ellen Scrivner Deputy Director

Davis Hart

Division Director, Operational Technologies Division

Debra Stoe Physical Scientist, Operational Technologies Division

Frances Scott

Physical Scientist, Information Sensor and Technology Division

The preparation of this document was sponsored by the National Institute of Justice.

The National Institute of Justice is a component of the Office of Justice Programs, which also includes the Bureau of Justice Assistance; the Bureau of Justice Statistics; the Community Capacity Development Office; the Office for Victims of Crime; the Office of Juvenile Justice and Delinquency Prevention; and the Office of Sex Offender Sentencing, Monitoring, Apprehending, Registering, and Tracking (SMART).


Special Technical Committee This standard was developed by a Special Technical Committee of practitioners, technical experts, and others with experience in standards development and conformity assessment. Committee members, their organizations and their professional affiliations are listed in Table 1 and Table 2.

Table 1. Practitioners

Type Name Organization Professional Affiliation

Table 2. Technical Experts and Others

Type Name Organization Expertise

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Advisory Working Group The work of the Special Technical Committee was reviewed by an Advisory Working Group (AWG) made up of senior-level representatives from stakeholder organizations and individuals with experience in standards development and conformity assessment. Members and their organizations are listed in Table 3 below.

Table 3. AWG Members

Member Organization Title

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FOREWORD

This document is a voluntary performance standard published by the National Institute of Justice (NIJ) for walk-through metal detectors used by public safety. It defines both performance requirements and the methods used to test performance. Details on the test objects required for testing may be found in NIJ Report 100-07, Metal Detector Test Objects Report. In order for a manufacturer or other entity to claim that a particular hand-held metal detector model satisfies this NIJ standard, the model must be in compliance with this standard as determined in accordance with this document and the associated document, Public Safety Walk-Through Metal Detector Certification Program Requirements, NIJ CR-0601.03. Both this standard and the associated certification program requirements document are produced as a part of the Standards and Testing Program of the U.S. Department of Justice, Office of Justice Programs, NIJ, as is a third associated document, the Public Safety Selection and Application Guide to Walk-Through Metal Detectors, NIJ Guide-0601.03.

All requirements stated in this standard, including those that explicitly employ mandatory language (e.g., “shall”) are those necessary to satisfy the standard. Nothing in this document is intended to require or imply that commercially available walk-through metal detectors for use by public safety must satisfy this standard.

This document is a performance and testing standard and, therefore, provides precise and detailed test methods.

Publication of NIJ Standard-0602.03 does not render unsuitable or obsolete any walk-through metal detectors currently in use by public safety agencies. Although NIJ is not suggesting the removal of any existing walk-through metal detectors from service, agencies are advised to require that future procurements specify that equipment shall meet or exceed the most recent version of this standard.

NIJ standards are subject to continued research, development and testing, and to review and modification as appropriate on an ongoing basis. Users of this standard are advised to check www.justnet.org on a regular basis to determine whether it has been revised or superseded.

Technical comments and recommended revisions are welcome. Please send all written comments and suggestions to Director, National Institute of Justice, Office of Justice Programs, U.S. Department of Justice, 810 Seventh St., N.W., Washington, DC 20531.

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Nothing in this document is intended to create any legal or procedural rights enforceable against the United States. Moreover, nothing in this document creates any obligation for manufacturers, law enforcement agencies, or others to follow or adopt this voluntary law enforcement technology equipment standard.

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CONTENTS

1. SCOPE, PURPOSE AND APPLICATION........................................................ 1

1.1 Scope .................................................................................................................. 1

1.2 Purpose ............................................................................................................... 1

1.3 Application ......................................................................................................... 2

2. REFERENCES ................................................................................................... 3

2.1 Associated Publications ...................................................................................... 3

2.2 Referenced Publications ..................................................................................... 3

2.3 American Conference of Governmental Industrial Hygienists Publications ..... 3

2.4 American National Standards Institute Publications .......................................... 3

2.5 International Commission on Illumination Publications .................................... 3

2.6 International Electrotechnical Commission Publications .................................. 3

2.7 National Institute of Justice (NIJ) Publications .................................................. 5

2.8 National Institute of Standards and Technology (NIST) Publications ............... 5

2.9 U.S. Military Publications .................................................................................. 5

3. DEFINITIONS ................................................................................................... 7

3.1 General ............................................................................................................... 7

3.2 Standard-Specific Definitions ............................................................................ 7

4. FORM AND FIT REQUIREMENTS ............................................................... 15

4.1 WTMD Model Requirements ........................................................................... 15

4.2 Controls and Adjustments for WTMD Models ................................................ 16

4.3 Indication Requirements for WTMD Models .................................................. 16

4.4 Equipment Protection Requirements for WTMD Models ............................... 16

5. PERFORMANCE REQUIREMENTS ............................................................. 17

5.1 Acceptance Criteria .......................................................................................... 17

5.2 Safety Requirements ........................................................................................ 17

5.3 Detection Performance Requirements .............................................................. 18

5.4 WTMD Demonstration Requirements ............................................................. 19

5.5 Operator Control Requirements ....................................................................... 20

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5.6 Program Storage Requirements ........................................................................ 20

5.7 Alarm Indicator Requirements ......................................................................... 20

5.8 Status Alarm Indicator Tests ............................................................................ 20

5.9 Metallic Interference Requirements ................................................................. 21

5.10 Electrical Requirements ................................................................................... 21

5.11 Mechanical Requirements for Resistance to Shock ......................................... 22

5.12 Environmental Requirements ........................................................................... 22

5.13 Electromagnetic Interference Requirements .................................................... 23

6. TEST METHODS ............................................................................................ 25

6.1 General Test Requirements .............................................................................. 25

6.2 General Test Conditions ................................................................................... 25

6.3 Test Objects and Equipment ............................................................................ 25

6.4 Safety Tests ...................................................................................................... 27

6.5 Detection Performance Tests ........................................................................... 27

6.6 WTMD Demonstration Test ............................................................................. 33

6.7 Operator Control Test ....................................................................................... 34

6.8 Program Storage Test ....................................................................................... 34

6.9 Audible Alarm Indicator Test .......................................................................... 34

6.10 Visible Alarm Indicator Test ............................................................................ 35

6.11 Metal Object Detection Alarm Indicator Test .................................................. 35

6.12 System Status Alarm Indicator Test ................................................................. 35

6.13 Detection Ready State Alarm Indicator Test .................................................... 35

6.14 Speed Range Violation Alarm Indicator Test (Optional) ................................. 36

6.15 Electrical Tests ................................................................................................. 36

6.16 Test for Operation Near a Stationary Metal Object ......................................... 37

6.17 Test for Operation Near a Steel Floor .............................................................. 37

6.18 Test for Operation Near Steel Reinforced Floor .............................................. 38

6.19 Metallic Moving Object Test (Metal Door Interference Test) ......................... 38

6.20 Multiple Object Interference Test .................................................................... 39

6.21 Mechanical Resistance to Shock Test .............................................................. 40

6.22 Indoor or Sheltered Outdoor Temperature Stability and Range Test ............... 40

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6.23 Outdoor Temperature Stability and Range Test ............................................... 40

6.24 Relative Humidity Stability and Range Test .................................................... 40

6.25 Environmental Protection, Indoor Test ............................................................ 40

6.26 Environmental Protection, Sheltered Outdoor Test ......................................... 40

6.27 Environmental Protection, Outdoor Test ......................................................... 41

6.28 Radiated Emissions Test .................................................................................. 41

6.29 Conducted Emissions Test ............................................................................... 41

6.30 Radiated Magnetic Field Test (Low-Frequency Magnetic Field Susceptibility Test) .................................................................................................................. 41

6.31 Radiated RF Electromagnetic Field Immunity Test ......................................... 43

6.32 60 Hz Radiated Magnetic Field Test ................................................................ 43

6.33 Electrostatic Discharge Test ............................................................................. 43

6.34 Fast Transients Test .......................................................................................... 43

6.35 Surge Test ......................................................................................................... 44

6.36 RF Common Mode Test ................................................................................... 44

6.37 Voltage Interruptions and Dips Test ................................................................ 44

7. LABELING AND INFORMATION ................................................................ 45

7.1 General Product Label Requirements .............................................................. 45

7.2 User Information to Be Provided by the Manufacturer of the WTMD ............ 45

APPENDIX: INNOCUOUS ITEM TEST OBJECTS ............................................................. 47

EQUATIONS

Equation 1: Average position. ...................................................................................... 42

FIGURES Figure 1. Diagram of Walk-Through Metal Detector .................................................... 8

Figure 2. WTMD Front View ...................................................................................... 10

Figure 3. WTMD Side View ........................................................................................ 11

Figure 4. Specific Test Measurement Locations .......................................................... 12

Figure 5. Mechanical Drawing of Eyeglass Replica .................................................... 48

Figure 6: Innocuous Item Test Object Locations. ........................................................ 49

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ABBREVIATIONS, SYMBOLS, PREFIXES AND CONVERSIONS

ACGIH American Conference of Government Industrial Hygenists ASTM American Society for Testing and Materials International CIE International Commission on Illumunation IEC International Electrotechnical Commission ISO International Standards Organization MIL-STD Military Standard NLECTC National Law Enforcement and Corrections Technology Center NIJ National Institute of Justice NIST National Institute of Standards and Technology OLES Office of Law Enforcement Standards OSHA Occupational Safety and Health Administration TOP Test Operations Procedure WTMD Walk-Through Metal Detector X Average of the adjacent horizontal zone widths xi Horizontal zone width Y Average of adjacent vertical zone spans yi Vertical zone span

Commonly Used Symbols and Abbreviations

A ampere H henry nm nanometer ac alternating current h hour No. number AM amplitude modulation hf high frequency o.d. outside diameter cd candela Hz hertz Ω ohm cm centimeter i.d. inside diameter p. page CP chemically pure in inch Pa pascal c/s cycle per second IR infrared pe probable error d day J joule pp. pages dB decibel kN Kilo newton ppm parts per million dc direct current L liter qt quart °C degree Celsius Lb pound rad radian °F degree Fahrenheit lbf pound force rf radio frequency diam diameter lbf⋅in pound force inch rh relative humidity emf electromotive force lm lumen s second eq equation ln logarithm (base e) SD standard deviation F farad log logarithm (base 10) sec. section fc footcandle M molar SWR standing wave ratio fig. figure m meter uhf ultrahigh frequency FM frequency modulation min. minute UV ultraviolet ft foot mm millimeter V volt ft/s foot per second mph miles per hour vhf very high frequency g acceleration m/s meter per second W watt g gram N newton λ wavelength gr grain N⋅m newton meter wt weight

area = unit2 (e.g., ft2, in2, etc.); volume = unit3 (e.g., ft3, m3, etc.)

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Prefixes

d deci (10-1) da deka (10) c centi (10-2) h hecto (102) m milli (10-3) k kilo (103) µ micro (10-6) M mega (106) n nano (10-9) G giga (109) p pico (10-12) T tera (1012)

Common Conversions

0.30480 m = 1 ft 4.448222 N = 1 lbf 2.54 cm = 1 in 1.355818 J = 1 ft⋅lbf 0.4535924 kg = 1 lb 0.1129848 N.m = 1 lbf⋅in 0.06479891 g = 1 gr 14.59390 N/m = 1 lbf/ft 0.9463529 L = 1 qt 6894.757 Pa = 1 lbf/in2 3600000 J = 1 kW⋅h 1.609344 km/h = 1 mph


1. SCOPE, PURPOSE AND APPLICATION

1.1 Scope

1.1.1 This document is a voluntary standard. All requirements stated in this standard, including those that explicitly employ mandatory language (e.g., “shall”) are those necessary to satisfy the standard. Nothing in this document is intended to require or imply that commercially available walk-through metal detectors (WTMDs) used by public safety must satisfy this standard. In order for a manufacturer or other entity to claim that a particular WTMD model satisfies this NIJ standard, however, the model must be found to comply with this standard as determined in accordance with this document and the associated document, Public Safety Walk-through Metal Detector Certification Program Requirements, NIJ CR-0601.03.

1.1.2 This standard specifies the minimum requirements for form and fit, performance, testing, documentation, and labeling of active WTMDs used by public safety to detect concealed metallic weapons and contraband.

1.1.3 This standard shall establish requirements for new, unused WTMDs.

1.1.4 This standard shall not be understood as addressing all of the safety concerns associated with the use of WTMDs used by public safety.

1.1.5 This standard shall not be understood as addressing the safety concerns, if any, associated with the use of this standard by testing facilities.

1.1.6 No manufacturer or other entity shall claim compliance with only selected portions of this standard. The WTMD model shall meet all applicable stated requirements.

1.1.7 As appropriate (e.g., for models that employ materials or forms of construction that were not anticipated when this standard was developed or are not addressed by this standard), NIJ may modify the test methods of the standard or establish new ones.

1.1.8 Nothing herein shall be understood to restrict any WTMD manufacturer from exceeding the requirements of this standard.

1.2 Purpose

1.2.1 The purpose of this standard is to specify minimum performance requirements and methods for testing active WTMDs used by public safety for the detection of metallic weapons or contraband carried on a person and/or concealed by a nonmetal object.

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1.2.2 The purpose of the test methods in this standard is to assess performance and should not be understood to specify performance levels for all situations and hazards to which public safety personnel may be exposed.

1.2.3 This standard is not intended to be used as a detailed manufacturing or purchase specification but may be referenced in purchase specifications as minimum requirements.

1.3 Application

1.3.1 This standard provides for three classifications of WTMDs based on the test objects can be detected by the WTMD: MD Class 1, MD Class 2 and MD Class 3 (See Section 3.2.21).

1.3.2 All measurement units used in this document are metric. Length units are abbreviated: meter (m), centimeter (cm) and millimeter (mm). Where useful, English units are indicated in parentheses immediately following the metric units, such as “2.54 cm (1 in).”

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2. REFERENCES

2.1 Associated Publications

The following document is a companion publication to NIJ Standard-0601.03, NIJ Report 100-07, and NIJ CR-0601.03.

NIJ Guide-0601.03, Public Safety Selection and Application Guide to Walk-through Metal Detectors, Washington, DC: U.S. Department of Justice, National Institute of Justice.

2.2 Referenced Publications

The following references form a basis and provide support for the requirements and procedures described in this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document applies, including any amendments.

2.3 American Conference of Governmental Industrial Hygienists Publications

2.3.1 ACGIH-0302:1996. Documentation of the Threshold Limit Values, Sub-Radio Frequency (30 kHz and below) Magnetic Fields. Cincinnati, OH: American Conference of Governmental Industrial Hygienists.

2.4 American National Standards Institute Publications

2.4.1 ANSI/ISA-61010-1:2005. 2005. Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use – Part 1: General Requirements. Washington, DC: American National Standards Institute.

2.4.2 ANSI/NEMA WD 6:2002. 2002. American National Standards Institute and National Electrical Manufacturing Association. Wiring Devices - Dimensional Specifications. Washington, DC: American National Standards Institute.

2.4.3 ANSI S1.4:1983. 1983. Specifications for General Purpose Sound Level Meters. Washington, DC: American National Standards Institute.

2.5 International Commission on Illumination Publications

2.5.1 ISO/CIE 23539:2005. 2005. Photometry – The CIE System of Physical Photometry. Vienna, Austria: Commission Internationale de l´Eclairage.

2.6 International Electrotechnical Commission Publications

2.6.1 CISPR 22. 2008. Information Technology Equipment – Radio Disturbance Characteristics – Limits and Methods of Measurement. Geneva, Switzerland: International Electrotechnical Commission.

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2.6.2 IEC 60068–2–27. 2008. Basic Environmental Testing Procedures, Part 2-27: Tests – Test Ea and Guidance: Shock. Geneva, Switzerland: International Electrotechnical Commission.

2.6.3 IEC 60068-2-30. 2005. Environmental Testing, Part 2-30: Tests – Test Db: Damp Heat, Cyclic (12 h + 12 h Cycle). Geneva, Switzerland: International Electrotechnical Commission.

2.6.4 IEC 60529. 2001. Degrees of Protection Provided by Enclosures (IP Code). Geneva, Switzerland: International Electrotechnical Commission.

2.6.5 IEC 61000-4-2. 2001. Electromagnetic Compatibility (EMC), Part 4-2: Testing and Measurement Techniques – Electrostatic Discharge Immunity Test. Geneva, Switzerland: International Electrotechnical Commission.

2.6.6 IEC 61000-4-3. 2008. Electromagnetic Compatibility (EMC), Part 4-3: Testing and Measurement Techniques – Radiated, Radio-Frequency, Electromagnetic Field Immunity Test. Geneva, Switzerland: International Electrotechnical Commission.

2.6.7 IEC 61000-4-4. 2001. Electromagnetic Compatibility (EMC), Part 4-3: Testing and Measurement Techniques – Radiated, Radio-Frequency, Electromagnetic Field Immunity Test. Geneva, Switzerland: International Electrotechnical Commission.

2.6.8 IEC 61000-4-5. 2004. Electromagnetic Compatibility (EMC), Part 4-5: Testing and Measurement Techniques – Surge Immunity Test. Geneva, Switzerland: International Electrotechnical Commission.

2.6.9 IEC 61000-4-6. Electromagnetic Compatibility (EMC, Part 4-6: Testing and Measurement Techniques - Immunity to Conducted Disturbances, Induced by Radio-Frequency Fields. Geneva, Switzerland: International Electrotechnical Commission.

2.6.10 IEC 61000-4-8. 2001. Electromagnetic Compatibility (EMC), Part 4-8: Testing and Measurement Techniques – Power Frequency Magnetic Field Immunity Test. Geneva, Switzerland: International Electrotechnical Commission.

2.6.11 IEC 61000-4-11. 2004. Electromagnetic Compatibility (EMC), Part 4-11: Testing and Measurement Techniques – Voltage Dips, Short Interruptions and Voltage Variations Immunity Tests. Geneva, Switzerland: International Electrotechnical Commission.

2.6.12 IEC 61000-6-1. 2005. Electromagnetic Compatibility – Generic Immunity Standard, Part 1: Residential, Commercial, and Light Industry. Geneva, Switzerland: International Electrotechnical Commission.

2.6.13 IEC 61000-6-3. 2006. Electromagnetic Compatibility – Generic Emission – Emission Standard for Residential, Commercial, and Light-Industrial Environments. Geneva, Switzerland: International Electrotechnical Commission.

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2.7 National Institute of Justice (NIJ) Publications

2.7.1 NIJ CR-0601.03, Public Safety Walk-Through Metal Detector Certification Program Requirements. Washington, DC: U.S. Department of Justice, National Institute of Justice.

2.7.2 NIJ Report 100-07. Metal Detector Test Object. Washington, DC: U.S. Department of Justice, National Institute of Justice.

2.8 National Institute of Standards and Technology (NIST) Publications

2.8.1 NIST Technical Note 1297. 1994. Guidelines for Evaluating and Expressing the Uncertainty of NIST Measurement Results. Gaithersburg, MD: National Institute of Standards and Technology.

2.9 U.S. Military Publications

2.9.1 MIL-STD-810F:2000 Method 501.4. 2000. Test Method Standard for Environmental Engineering Considerations and Laboratory Tests, Method 501.4, High Temperature. Washington, DC: U.S. Department of Defense.

2.9.2 MIL-STD-810F:2000 Method 502.4. 2000. Test Method Standard for Environmental Engineering Considerations and Laboratory Tests, Method 502.4, Low Temperature. Washington, DC: U.S. Department of Defense.


3. DEFINITIONS

3.1 General

The definitions contained in this chapter shall apply to these terms as used in this standard. Where terms are not defined in this chapter or within another chapter, they shall be defined using their ordinarily accepted meanings within the context in which they are used.

3.2 Standard-Specific Definitions

3.2.1 Alarm indication instance: The time in the recorded waveform of the alarm indication at which the alarm indication changes states.

3.2.1.1 Final alarm indication instance: The instant when the alarm indication changes from the on-state to the off-state as the test object is moving away from the WTMD.

3.2.1.2 Initial alarm indication instance: The instant when the alarm indication changes from the off-state to the on-state as the test object is moving toward the WTMD.

3.2.2 Alarm indication: A signal to the operator indicating the detection of a metal object.

3.2.3 Alarm indicator: A visible or audible device used to provide awareness of detection of a metal object.

3.2.4 Alarm reset time: The amount of time required for the WTMD to be ready to sense another metallic test object after sensing a first metallic test object.

3.2.5 Calibration artifacts: Objects used to transfer standardization from one system to another and/or from one time to another. These objects are defined by the WTMD manufacturer and used to provide traceability to documented results.

3.2.6 Care: Cleaning, decontamination and storage of WTMDs.

3.2.7 Clean test subject: A person who is verified not to be carrying any electrically conductive or magnetizable objects such as metallic belt buckles, metal buttons, a cardiac pacemaker, coins, metal-frame eyeglasses, a hearing aid, jewelry, keys, pens, pencils, shoes with metal arches or supports, metallic surgical implants, undergarment support metal, metal zippers, or similar items that would significantly alter the signal produced when this person carries a test object.

3.2.7.1 Alternative: A clean test subject may be replaced by a human simulator that approximates the mass and mass distribution of an average adult male. The human simulator shall be constructed of carbon impregnated fuoroelastomer with a conductivity of approximately 0.25 S/m over a range of 200 Hz to 3 MHz. The human simulator shall be equipped with casters and a means to push it through the detector at speeds between 0.2 m/s ± 0.1 m/s and 2.0 m/s ± 0.1m/s.

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3.2.8 Detection: The discovery or finding of a metallic object.

3.2.8.1 Detector axis: An imaginary line passing through and perpendicular to the WTMD’s plane. This line is centered vertically and horizontally within the portal and points in the direction of the test subject’s motion through the portal. (See Figure 1.)

3.2.8.2 Detector floor: The bottom plane of the WTMD’s portal, which rests on the top surface of the WTMD’s platform.

3.2.8.3 Detector plane: An imaginary two-dimensional surface parallel to the portal that bisects the sensor region into two symmetric halves. This “surface” contains two orthogonal axes labeled as the x axis and the z axis. (See Figure 1.)

3.2.8.4 Detector platform: A nonconductive, nonmagnetic platform on which the WTMD rests. The WTMD mount locates the detector floor at a height of 32.5 cm (12.8 in) and contains grooves or a shelf located at 10 cm (4 in) below its top surface to facilitate the metal floor test required in Section 6.15.

Figure 1. Diagram of Walk-Through Metal Detector

y axis

z axis

x axis

detector planedetector axis

detector floor

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3.2.9 Detector response: An electrical signal generated by the sensor or sensor circuit of a walk-through metal detector, caused by a metallic object interacting with the magnetic field generated by the device; the basis on which an alarm indication is derived.

3.2.10 Manufacturer: A commercial enterprise engaged in fabricating a product.

3.2.11 Maintenance: Inspection, repair and retirement of WTMDs.

3.2.12 Measurement coordinate system: A mutually orthogonal three-dimensional Cartesian scheme referenced to the detector axis and the detector plane. The three axes are labeled x-axis, y-axis and z-axis, where the y-axis is parallel to the detector axis, and the x and z axes are located in the detector plane. The origin of the x-y-z axes is located on the detector floor midway between the sides of the portal. The orientation of the test objects and direction of the magnetic field is referenced to this scheme. (See Figure 1.)

3.2.13 Minimum detection condition: During the Detection Sensitivity Test (refer to Section 5.3.2), each test measurement grid location has a recorded maximum detection signal for each test object at each orientation. From those recorded maximum detection signals, indicate the lowest of those values for each test object at each orientation. For that lowest value, record the test object, orientation and test measurement grid location as the minimum detection condition for a single object class. The result is one minimum detection condition per test object class.

3.2.14 Model: The manufacturer’s design, with unique specifications and characteristics, of a particular item.

3.2.15 Object classes: A categorization scheme based on the ability to detect metal objects of a certain size and electromagnetic characteristics. A WTMD may meet the requirements for one, two or three object classes: MD Class 1, MD Class 2 and MD Class 3. (Refer to Test Object definitions in Section 3.2.21.)

3.2.16 Portal: The open area of the WTMD through which a person walks to be assessed for the presence of metallic objects. Refer to Figure 2 and Figure 3.

3.2.16.1 Portal depth: Distance between the portal entry face and the portal exit face.

3.2.16.2 Portal entry face: The first edge of the portal that a person or a test object passes during the detection process.

3.2.16.3 Portal exit face: The last edge of the portal that a person or a test object passes during the detection process.

3.2.16.4 Portal height: The distance between the detector floor and the ceiling of the portal.

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3.2.16.5 Portal width: The distance between the interior sides or walls of the portal.

3.2.17 Product: One unit of a particular model.

3.2.18 Product label: A marking affixed by a manufacturer to each unit of a compliant model or to the compliant model package, which contains required model information and the mark of conformity.

3.2.19 Sample: A WTMD that is subjected to testing. A sample is to be representative of a model.

3.2.20 Specific test measurement location: The nine positions in the detector plane (x-z plane) through which the test object(s) shall be passed. These positions are based on the size of an average adult male and are defined at points along the x-axis and z-axis of the coordinate system. There are two positions at ankle height separated approximately by hip width, two at hip height separated approximately by hip width, two at shoulder height separated approximately by torso width, one at top of head height centered along the z-axis, one at slightly below armpit height centered along the z-axis and one at crotch height centered along the z-axis. (See Figure 4.) These positions are a subset of the test measurement grid locations.

Figure 2. WTMD Front View

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Figure 3. WTMD Side View

3.2.21 Test object: An item used to assess the detection performance of a WTMD. It may simulate a threat or be an innocuous item as defined below:

3.2.21.1 MD Class 1 test objects: Items used to test the detection performance of WTMDs that locate items nominally the size of a handgun. MD Class 1 test objects were previously referred to as large size test objects.

3.2.21.2 MD Class 2 test objects: Items used to test the detection performance of WTMDs that locate items nominally the size of a paring knife. MD Class 2 test objects were previously referred to as medium size test objects.

3.2.21.3 MD Class 3 test objects: Items used to test the detection performance of WTMDs that locate items such as short sections of hacksaw blades, hand-held paint scraper blades, small stainless steel knives, screwdriver bits, small caliber ammunition and handcuff keys. MD Class 3 test objects were previously referred to as small size test objects.


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3.2.21.4 Innocuous item test objects: Items used to test the discrimination capability of MD Class 1 and MD Class 2 WTMDs. Details for the innocuous items are provided in Appendix A.

3.2.22 Test measurement grid location: Grid pattern with its origin at the intersection of the x-z axes and with 5 cm ± 0.5 cm spaces located within the detector plane (See Section 3.2.12). The z-axis limits are 0 cm + 0.5 cm/- 0 cm and 180 cm ± 1.0 cm. The x-axis limits shall be as close as possible to 10 cm ± 0.5 cm from the inside surfaces of each of the WTMD’s sides.

Figure 4. Specific Test Measurement Locations


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3.2.23 Test object axes: Three mutually orthogonal lines that are referenced to, and have a one-to-one correspondence with, the corresponding lines of the measurement coordinate system.

3.2.24 Three-axis positioning system: A scheme providing mutually orthogonal directions of linear translation used to place test objects in the WTMD’s magnetic field. A Cartesian robot may be used in this scheme, but is not required.

3.2.25 Throughput rate: The amount of time required for the WTMD to be ready to sense a metallic test object after sensing an innocuous test object.

3.2.26 Verification test: An abbreviated set of performance tests used to ensure the WTMD’s performance prior to use.

3.2.27 Walk-through metal detector (WTMD): A device using magnetic induction to detect objects of specific types. The device generates energy within its portal and contains source electronics that generate a magnetic field and detector electronics that sense magnetic fields. The interaction of the generated magnetic field with certain types of objects in the portal and the ability to detect this interaction is the basis of operation.

3.2.28 WTMD manufacturer: Supplier of a WTMD who submits a model for certification.


4. FORM AND FIT REQUIREMENTS

To be tested under the performance requirements of this standard, WTMD models shall satisfy the requirements of this chapter.

4.1 WTMD Model Requirements

4.1.1 The WTMD shall be designed to detect metallic concealed weapons and contraband items passing through the detector portal.

4.1.2 The WTMD shall be classified by the WTMD manufacturer as MD Class 1, MD Class 2 and/or MD Class 3 (Refer to NIJ Report 100-07).

4.1.2.1 If the WTMD is classified by the WTMD manufacturer for multiple classes, the WTMD shall be designed with a sensitivity adjustment and shall be tested for each MD Class.

4.1.3 The intended operating environment for the WTMD shall be specified by the WTMD manufacturer as indoor, outdoor sheltered or outdoor, and the WTMD shall be tested according to the appropriate requirements of Section 5.12.

4.1.4 The WTMD shall be designed so that the portal meets the following dimensional limits:

• Portal height, minimum: 195 cm (77 in).

• Portal width, minimum: 71 cm (28 in).

• Portal depth, maximum: 91 cm (36 in).

4.1.5 The WTMD shall have a mass no greater than 100 kg (220 lbs).

4.1.6 The WTMD shall be provided with an input power connector socket on both sides of the WTMD, unless the operation and function of the WTMD is the same for traffic flow in both directions, in which case an input power connector is required only on one side of the portal. To provide a secure connection, the power connector socket shall not be exposed and shall provide a means to prevent unintentional disconnection of the power cord.

4.1.7 The WTMD shall have an electrical connector from which either an analog or digital output signal is obtained. This signal represents the magnitude of the detector response to a test object and is the signal on which an alarm indication is based. If the output signal is analog, the connector shall be coaxial where the inner conductor provides the signal path and the outer conductor provides signal ground or return.

4.1.8 Calibration artifacts shall be provided by the WTMD manufacturer for each WTMD. The WTMD manufacturer shall define the x-z test positions and calibration artifact

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orientations, if applicable, for which the WTMD shall be tested with each calibration artifact. The WTMD manufacturer shall record the magnitude of the detection response from the WTMD for a pass of each calibration artifact and its specified orientation(s) through the portal at each test location.

4.2 Controls and Adjustments for WTMD Models

4.2.1 With the exception of the power on/off switch and audio alarm on/off switch, controls and adjustments that affect the performance of the WTMD (e.g., sensitivity settings) shall be capable of being secured against access by the operator.

4.3 Indication Requirements for WTMD Models

4.3.1 The WTMD shall be designed to provide visible and audible alarm indication in the event that a metallic object within the appropriate object class is detected.

4.4 Equipment Protection Requirements for WTMD Models

4.4.1 All circuits, wiring or cables (other than input power cables) shall be enclosed.

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5. PERFORMANCE REQUIREMENTS

5.1 Acceptance Criteria

5.1.1 To declare conformity with this standard, all performance requirements defined in the following sections shall be met for each of the categories listed below:

• Safety requirements (Section 5.2).

• Detection performance requirements (See Section 5.3).

• Operator control requirements (See Section 5.4).

• Program storage requirements (See Section 5.6).

• Alarm indicator requirements (See Section 5.7).

• Status indicator requirements (See Section 5.8).

• Metallic interference requirements (See Section 5.9).

• Electrical requirements (See Section 5.10).

• Mechanical requirements (See Section 5.11).

• Environmental requirements (See Section 5.12).

• Electromagnetic interference requirements (See Section 5.13).

5.1.2 The WTMD shall meet the detection performance requirements for each MD Class for which it is intended to operate.

5.1.3 The detection performance shall be evaluated by the test methods described in Section 6, and all tests referenced in this section shall include the requirements of Sections 6.1 and 6.2.

5.1.4 The safety tests shall be performed first, followed by the detection performance tests. Environmental tests shall follow mechanical tests on a single unit. No other specific test sequence is required.

5.2 Safety Requirements

5.2.1 The WTMD shall meet the fire, electrical, thermal and mechanical safety requirements of ANSI/ISA-61010-1, as applicable.

5.2.2 The WTMD shall comply with the magnetic field exposure requirements as specified in ACGIH–0302:1996, as amended.

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5.3 Detection Performance Requirements

5.3.1 The WTMD shall be tested as specified in Section 6.5, Detection Performance Tests, for all object classes for which the WTMD manufacturer states it can meet the performance specifications. General guidelines and initial procedures as specified in Sections 6.5.1 and 6.5.2 shall apply.

5.3.2 The WTMD shall be tested as specified in, Section 6.5.3, Detection Sensitivity Test. The detector response shall be measured at all test measurement grid locations and shall provide a positive alarm indication for each test object of the appropriate MD Class for each allowed orientation of the test object axes with respect to the measurement coordinate system moving at a speed of 1.0 m/s ± 0.1 m/s. The minimum detection condition for each appropriate MD Class recorded during the Detection Sensitivity Test shall be applied in other subsequent tests.

5.3.3 The WTMD shall be tested as specified in Section 6.5.4, Speed Test. The WTMD shall provide a positive alarm indication for the minimum detection condition for each appropriate MD for the test object moving at all specified scan speeds.

5.3.4 The WTMD shall be tested according to Section 6.5.5, Repeatability Test. The WTMD shall provide a positive alarm indication without failure for the minimum detection condition for each appropriate MD Class for the test object moving at the specified scan speed.

5.3.5 The WTMD shall be tested as specified in Section 6.5.6, Discrimination Test. The WTMD shall not provide a positive alarm indication for at least 20 of 25 consecutive trials for innocuous item test objects moving at the specified scan speed.

5.3.6 The WTMD shall be tested as specified in Section 6.5.7, Alarm Indication Timing Test, for a test object of the appropriate MD Class and its orientation according to the minimum detection conditions as determined in Section 6.5.3. The alarm indication shall be detected after the test object reaches the portal entry face, but before the test object passes the midpoint of the portal. The alarm indication shall remain activated for 1.0 sec ± 0.1 sec for each trial.

5.3.7 The WTMD shall be tested in accordance with Section 6.5.8, Throughput Rate Test, and shall demonstrate a throughput time of no greater than 1.2 seconds.1

5.3.8 The WTMD shall be tested in accordance with Section 6.5.9, Alarm Reset Test, and shall demonstrate an alarm reset time of no greater than 2.0 seconds.2

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1 Time of 1.2 seconds corresponds to a rate of at least 50 clean subjects/min. 2 Time of 2.0 seconds corresponds to a rate of at least 25 metallic objects/min.


5.3.9 Zonal Detection and Object Location (optional)

5.3.9.1 The WTMD manufacturer shall declare whether or not the WTMD provides zonal detection and object location. This feature is optional.

5.3.9.2 If the WTMD is claimed to provide zonal detection and object location, the following requirements shall be met.

5.3.9.3 Regardless of whether the WTMD provides zonal detection and object location, the WTMD shall comply with all other detection performance requirements of Section 5.3. The WTMD shall be tested using the test object orientation for the minimal detection condition for each appropriate MD Class test object. The test object shall also be tested at each of the nine specific test measurement locations.

5.3.9.4 If the WTMD is claimed to have horizontal zones, the WTMD shall meet the following requirements: The horizontal width, xi, of each zone shall be specified, where it indicates the horizontal zone number. X shall be calculated and recorded as the average of the adjacent horizontal zone widths. The sum of the horizontal zone widths (Σxi) shall equal the portal width.

5.3.9.5 If the WTMD is claimed to have vertical zones, the WTMD shall meet the following requirements: The vertical span, yj of each zone along the z-axis shall be specified, where j indicates the vertical zone number. Y shall be calculated and recorded as the average of the adjacent vertical zone spans. The sum of the vertical zone spans (Σyi) shall equal the portal height, and the portal height shall be spanned by at least three zones.

5.3.9.6 The indication accuracy of any metallic objects of the appropriate object class shall be ± 0.5*X in the x-axis direction and ± 0.5*Y in the z-axis direction as measured from the geometric center of the test object for its given orientation to the geometric center of the WTMD manufacturer-defined horizontal and vertical zones.

5.3.9.7 The WTMD shall correctly indicate the location of all test objects of the appropriate size class by highlighting the corresponding zone. This test shall be performed a total of five times.

5.4 WTMD Demonstration Requirements

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5.4.1 The WTMD shall be tested as specified in Section 6.6, WTMD Demonstration Test, and shall provide a positive alarm indication for the test object located within the appropriate measurement plane for each required orientation of the test object axes and at each required speed. The WTMD shall not provide a positive alarm indication in the absence of the test object.

Note: The WTMD Demonstration Test is performed within several test methods of Chapter 6 to verify proper operation of the WTMD. The above WTMD demonstration requirements shall be met in every case.


5.5 Operator Control Requirements

5.5.1 The WTMD shall be tested as specified in Section 6.7, Operator Control Test, for the operator control functions of power on/off and audio alarm on/off. The WTMD shall successfully perform all functions.

5.6 Program Storage Requirements

5.6.1 The WTMD shall be tested for program and detection sensitivity settings storage as specified in Section 6.8, Program Storage Test, and the program parameters prior to AC power interruption shall be identical to those recorded after a 5-minute interruption in AC power.

5.7 Alarm Indicator Requirements

5.7.1 All audible alarm indicators (excluding any earphone) shall be tested as specified in Section 6.9, Audible Alarm Indicator Test, and shall produce an alarm-state sound pressure level of at least 75 dB ± 5 dB at 0.8 m ± 0.08 m from the WTMD as measured during the test. For status indicators, the audible alarm shall be a two-state audible alarm: active (alarm state) and inactive (nonalarm state). The two-state alarm indicator shall produce no sound in the nonalarm state.

5.7.2 Any visible alarm indication shall be tested as specified in Section 6.10, Visible Alarm Indicator Test, and shall be readily perceptible. The visible alarm indicators shall be a two-state visible alarm: active and inactive. The active indication shall be illuminating, and the inactive indication shall be non-illuminating.

5.7.3 The WTMD shall be tested for metal object detection as specified in Section 6.11, Metal Object Detection Alarm Indication Test, and shall have a two-state audible alarm indicator and a visible alarm indicator that shall alarm to indicate the presence of a test object in the portal region. The alarm state for the metal object detection visible alarm indicator shall be active (illuminating) and the nonalarm state shall be inactive (nonilluminating). The metal object detection visible alarm indicator shall be distinct from any other visible alarm indicators.

5.8 Status Alarm Indicator Tests

5.8.1 The WTMD shall be tested as specified in Section 6.12, System Status Alarm Indicator Test, and shall have a two-state audible alarm indicator or a visible alarm indicator to indicate the operational state of the WTMD and shall be activated if the operational state of the WTMD can cause a degradation of the detection performance required by this standard. The system status visible alarm indicator shall be inactive (nonilluminating) if the system status is acceptable and shall be active (illuminating) if a system status problem exists. The system status visible alarm indicator shall be distinct from any other visible alarm indicators.

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5.8.2 The WTMD shall be tested as specified in Section 6.13, Detection Ready State Alarm Indicator Test, and shall have a visible indicator showing the ready state of the WTMD clearly visible to approaching traffic and the operator. The ready state shall be indicated by a green and red visible indicator; the green visible indicator shall denote readiness and the red visible indicator shall denote lack of readiness. The green light (or Go light) shall indicate that the WTMD is ready for a person to enter and pass through the portal, and the red light (or Stop light) shall indicate that the WTMD is not ready for a person to enter. The WTMD shall have a two-state audible alarm indicator or a visible alarm indicator to indicate passage of a person through the portal when it is not in the ready state, and shall be activated if a person attempts to pass through the portal when it is not in the ready state. The visible alarm indicator shall be active (illuminating) if a person attempts to pass through the portal when it is not in the ready state and inactive (nonilluminating) otherwise.

5.8.3 Optional Requirement. The WTMD shall be tested as specified in Section 6.14, Speed Range Violation Alarm Indicator Test, and shall contain a visible alarm indicator that is activated if the speed of a person walking through the portal is outside the speed range of 0.2 m/s ± 0.1m/s to 2.0 m/s ± 0.1 m/s.

5.9 Metallic Interference Requirements

5.9.1 The WTMD shall be tested in accordance with Section 6.16, Test for Operation Near a Stationary Metal Object, and shall not produce a positive alarm indication when no test object is presented to the WTMD.

5.9.2 The WTMD shall be tested in accordance with Section 6.17, Test for Operation Near a Steel Floor, and shall not produce a positive alarm indication when no test object is presented to the WTMD.

5.9.3 The WTMD shall be tested in accordance with Section 6.18, Test for Operation Near a Steel Reinforced Floor, and shall not produce a positive alarm indication when no test object is presented to the WTMD.

5.9.4 The WTMD shall be tested in accordance with Section 6.19, Metallic Moving Object Test. The WTMD shall not produce a positive alarm indication when operated near a moving metal door and shall not fail to produce a positive alarm indication when a test object is passed through the portal.

5.9.5 Requirement for MD Class 1 only. The WTMD shall be tested in accordance with Section 6.20, Multiple Object Interference Test, and shall produce a positive alarm indication.

5.10 Electrical Requirements

5.10.1 The WTMD shall be tested for AC power operation as specified in Section 6.15.1, AC Power Test. While operating at power line voltages equal to ± 10% of the nominal value and with variations in frequency ± 5% of the nominal value of 60 Hz, the

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WTMD shall provide a positive alarm indication for the test object located at the nine test measurement grid locations for each required orientation of the test object axes and at each required speed. The WTMD shall not provide a positive alarm indication in the absence of the test object.

5.10.2 The WTMD shall be tested for battery backup as specified in Section 6.15.2, Battery Backup Test. The battery backup shall automatically activate in the event that AC voltage falls below the minimum power required for operation (see Section 5.10.1) and shall be capable of providing at least 20 minutes of uninterrupted power to a fully functional and operational WTMD.

5.11 Mechanical Requirements for Resistance to Shock

5.11.1 The WTMD and all of its components and their interconnections shall be tested as specified in Section 6.21 for shock and shall exhibit no observable changes.

5.12 Environmental Requirements

5.12.1 The WTMD and all of its components and their interconnections shall meet the requirements of this section. The requirements of sections 5.2 and 5.11 shall not be affected by the tests identified in this section.

5.12.2 The requirements given in this section shall be applied appropriately for either indoor, sheltered outdoor or outdoor WTMD models.

5.12.3 The tests identified in this section shall be performed on the same sample.

5.12.4 The WTMD shall be tested as specified in Section 6.22, Indoor or Sheltered Outdoor Temperature Stability and Range Test, and shall operate over an ambient temperature range of at least 0°C to 46°C (32 F to 115°F).

5.12.5 The WTMD shall be tested as specified in Section 6.23, Outdoor Temperature Stability and Range Test, and shall operate over an ambient temperature range of at least -37°C to 65°C (-35°F to 149°F).

5.12.6 The WTMD shall be tested as specified in Section 6.24, Relative Humidity Stability and Range, and shall meet or exceed the requirements of IEC 60068-2-30.

5.12.7 The WTMD shall be tested as specified in Section 6.25, Environmental Protection, Indoor Test, and shall meet or exceed the requirements for compliance to IEC 60529 Classification IP41.

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5.12.8 The WTMD shall be tested as specified in Section 6.26, Environmental Protection, Sheltered Outdoor Test, and shall meet or exceed the requirements for compliance to IEC 60529, Classification IP53.


5.12.9 The WTMD shall be tested as specified in Section 6.27, Environmental Protection, Outdoor Test, and shall meet or exceed the requirements for compliance to IEC 60529, Classification IP55.

5.13 Electromagnetic Interference Requirements

5.13.1 The WTMD shall be tested for radiated emissions as specified in Section 6.28, Radiated Emissions Test, and shall meet the requirements of Table 1 of IEC 61000-6-3:2006, as amended.

5.13.2 The WTMD shall be tested for conducted emissions as specified in Section 6.29, Conducted Emissions Test, and shall meet the requirements of Table 1 of IEC 61000-6-3:2006, as amended.

5.13.3 While operating in a radiated magnetic field as specified in Section 6.30, Radiated Magnetic Field Test, the WTMD shall not provide a positive alarm indication in the absence of a test object and shall not fail to provide a positive alarm indication in the presence of an MD Class 1 test object.

5.13.4 The WTMD shall be tested as specified in Section 6.31, Radiated RF Electromagnetic Field Immunity Test, and shall not provide a positive alarm indication in the absence of a test object and shall not fail to provide a positive alarm indication in the presence of an MD Class 1 test object.

5.13.5 The WTMD shall be tested as specified in Section 6.32, 60 Hz Radiated Magnetic Field Test, and shall not provide a positive alarm indication in the absence of a test object and shall not fail to provide a positive alarm indication in the presence of an MD Class 1 test object

5.13.6 The WTMD shall be tested as specified in Section 6.33, Electrostatic Discharge Test, and shall not provide a positive alarm indication in the absence of a test object and shall not fail to provide a positive alarm indication in the presence of an MD Class 1 test object.

5.13.7 The WTMD shall be tested as specified in Section 6.34, Fast Transients Test, and shall not provide a positive alarm indication in the absence of a test object and shall not fail to provide a positive alarm indication in the presence of an MD Class 1 test object.

5.13.8 The WTMD shall be tested as specified in Section 6.35, Surges Test, and shall not provide a positive alarm indication in the absence of a test object and shall not fail to provide a positive alarm indication in the presence of an MD Class 1 test object.

5.13.9 The WTMD shall be tested as specified in Section 6.36, RF Common Mode, and shall not provide a positive alarm indication in the absence of a test object and shall not fail to provide a positive alarm indication in the presence of an MD Class 1 test object.

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5.13.10 The WTMD shall be tested as specified in Section 6.37, Voltage Interruptions and Dips Test, and shall not provide a positive alarm indication in the absence of a test object and shall not fail to provide a positive alarm indication in the presence of an MD Class 1 test object.

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6. TEST METHODS

6.1 General Test Requirements

6.1.1 Each test shall be performed on one sample representative of the production model. Unless specified otherwise within a test method, the WTMD manufacturer shall specify whether a new, untested sample is used for each test.

6.1.2 All test data and observations shall be recorded and reported.

6.2 General Test Conditions

6.2.1 Test location. The distance between any metal object other than a test object shall be at least 32.5 cm from the detector floor, at least 50 cm from the topmost part of the WTMD and at least 0.8 m from any side or outward projections of any side of the WTMD.

6.2.2 Environment. All tests, except for the environmental tests, shall be performed at conditions of 22°C ± 5°C (71.6°F ± 9.0°F), with relative humidity of 30% to 75% noncondensing, and atmospheric pressure of 86 kPa to 106 kPa (645 mm HG to 795 mm Hg)3.

6.2.3 Preparations. The WTMD shall be installed according to the WTMD manufacturer’s instructions. Any setup or calibration adjustments specified in the operator’s manual shall be performed if required.

6.3 Test Objects and Equipment

6.3.1 Test objects. Test objects, allowed orientations and positions are provided in NIJ Report 100-07.

6.3.2 Three-axis positioning system. The three-axis positioning system shall meet the following requirements:

• Displacement, x axis: ≥ 1 m.

• Displacement, y axis: ≥ 1.2 m

• Displacement, z-axis: ≥ 2 m.

• Position accuracy, each axis: 1 mm.

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• Position repeatability, each axis: 1 mm.

3 ANSI N42.44-2008, American National Standard for the Performance of Checkpoint Cabinet

X-Ray Imaging Security Systems.


• Maximum speed, y-axis: 2 m/s.

6.3.3 Magnetic field sensor. The magnetic field sensor shall have a frequency response bandwidth at least five times greater than the bandwidth of the generated magnetic field, shall provide a rms voltage output and shall have dimensions less than or equal to 4 cm x 4 cm x 4 cm.

6.3.4 Voltmeter. The AC voltmeter shall have a bandwidth at least five times greater than the bandwidth of the generated magnetic field, allow computer control and data retrieval, and have a variable gain input with at least 10-bit resolution full scale.

6.3.5 Microphone. A microphone shall be used to detect an audible positive alarm indication as described in Section 5.7, Alarm Indicator Requirements, and shall provide an analog output that can be interfaced to the computer controller (see Section 6.3.12).

6.3.6 Sound pressure level meter. A sound pressure level meter shall be used to measure the magnitude of the audible alarm indication and shall comply with ANSI S1.4:1983, for type 2, A-weighting, reference pressure of 20 μPa.

6.3.7 Light detector. A light detector shall be used to detect a visible positive alarm indication as described in Section 5.7, Alarm Indicator Requirements, and shall provide an analog electrical output that can be interfaced to the computer controller (see Section 6.3.12). The light detector shall have a coaxial output connector and an output impedance of ≥ 50 Ω.

6.3.8 Illumination meter. An illumination meter shall be used to measure the intensity of the background light level and the visible alarm indication. The illumination meter shall be capable of measuring light levels of 25 lm/m2 and 10,000 lm/m2 with an error of not more than 10%. The integrated spectral response shall be within 10% of the Commission Internationale de l’Eclairage photopic curve found in ISO/CIE 23539:2005.

6.3.9 Oscilloscope or waveform recorder: This device shall have at least three channels, a sensitivity range of at least 10 mV to 10 V and a minimum bandwidth of 20 MHz.

6.3.10 Detector platform. The WTMD shall have a nonconductive, nonmagnetic platform on which it rests. The WTMD mount locates the detector floor at a height of 32.5 cm (12.8 in) and contains grooves or a shelf located at 10 cm (4 in) below its top surface.

6.3.11 Test object support platform. The test object support platform shall be constructed of nonconductive, nonmagnetic materials. The purpose of this platform is to provide a

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rest for the test objects at the test measurement location heights of: 80 cm ± 1 cm, 130 cm ± 1 cm and 180 cm ± 1 cm.

6.3.12 Computer controller. The computer controller shall have installed and operational all necessary hardware and software for providing instrument control and data acquisition.

6.3.13 Test probe. The test probe shall be a 38-turn, single-layer coil of 24 AWG copper magnet wire wound on an air-core spool of 200 mm ± 5 mm diameter and 22 mm width. The maximum diameter of the insulated wire shall be 0.559 mm. The leads from the coil shall be brought together as a twisted pair with a twist pitch of approximately 100 mm. A noninductive resistor with a power dissipation of approximately 50 W shall be added in series with the test lead to bring the total resistance of the resistor plus test leads plus coil to 5 Ω ± 0.25 Ω. The axis of the coil is the line that passes through the center of the coil and is perpendicular to the plane formed by the coil.

6.3.14 Signal generator/source. The signal generator must be capable of generating four different sine-waves at (1) 60 Hz ± 1 Hz, (2) 15.75 kHz ± 10 Hz, (3) 40 kHz ± 10 Hz and (4) 20 Hz ± 1 Hz with an amplitude of 15 V peak-to-peak ± 1 V into a 5 Ω load (the test probe). The signal generator must also generate pulses with a repetition rate of 20 Hz ± 1 Hz and a pulse width of 0.5 ms ± 0.1 ms with an amplitude of 15 V ± 1 V.

6.4 Safety Tests

6.4.1 The WTMD shall be tested for magnetic field exposure as specified in ACGIH–0302:1996, as amended. The result of this test is a pass if the WTMD complies when tested as specified. Observations and results shall be recorded.

6.5 Detection Performance Tests

6.5.1 General Guidelines

6.5.1.1 For WTMDs that contain more than one generator and/or sensor, the WTMD response recorded shall be the one from which an alarm indication is derived.

6.5.1.2 If the WTMD can be adjusted to provide an alarm indication for both MD Class 1 test objects and MD Class 2 test objects, the detection performance test shall be performed for each object class. The detection performance shall be evaluated by the test methods described in this section.

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6.5.2 Initial Procedures

6.5.2.1 These initial procedures shall apply to all Detection Performance Tests.

• Ensure that the required test equipment and components (e.g., voltmeter, alarm indication detector and three-axis positioning system) are connected to the computer controller and that the detection signal output connector is connected to the voltmeter for analog signals or to the computer for digital signals.

• Turn on the required test equipment and verify proper operation of the measurement system.

• Ensure that the WTMD is securely located and positioned in the measurement coordinate system.

• Adjust the WTMD to the appropriate sensitivity setting.

• Select the appropriate test object and orientation from NIJ 100-07. Attach the test object with the proper orientation to the positioning system.

• Turn on the WTMD and ensure that its output functions properly by noting a change in the alarm indicator detector reading and activation of the alarm indication as a metal object is brought near the WTMD.

• Ensure that the test object does not hit any objects while in motion.

6.5.3 Detection Sensitivity Test

The purpose of this test is to assess the WTMD capability to detect test objects of a specified size and orientation at multiple locations within the portal.

6.5.3.1 Test procedure

• The x-axis scan limits shall be 10 cm ± 0.5 cm from the inside surface of the WTMD side.

• Set the computer program to perform a y-axis scan of length equal to the portal depth + 0.2 m (with a tolerance of ± 0.5 cm) and symmetric about the detector plane. The y-axis scan speed shall be 1.0 m/s ± 0.1 m/s.

• Set the x-axis position to its most positive limit and the z-axis position to zero and indicate this positioning as the initial measurement location.

• Perform a y-axis scan and do the following:

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Record the detection signal value(s) for each y-axis scan and report the maximum of these values for each test measurement grid location.

Record any positive alarm indication using the alarm indication detector as the y-axis scan is being performed

• Increment the x-axis in 5 cm ± 0.1 cm steps and repeat the y-axis scan measurement for each x-axis increment until the most negative x-axis limit is reached.

• Increment the z-axis in 5 cm ± 0.1 cm steps while repeating the x-axis incremented motion and the y-axis scan measurement until the z-axis positive limit is reached.

• This test must be repeated for each test object and its orientation as indicated in NIJ100-07.

• The test object, its orientation with respect to the measurement coordinate system, and the specific test measurement grid location of this test object that provide the smallest signal for the appropriate MD Class shall be recorded as the minimum detection condition.

6.5.4 Speed Test

The purpose of this test is to assess the WTMD capability to perform effectively when the test object is passed through the portal at a range of speeds.


• Set the computer program to perform a y-axis scan of length equal to the portal depth + 0.2 m (with a tolerance of ± 0.5 cm) and symmetric about the detector plane at the minimum detection condition. The y-axis scan shall be performed at four speeds:

0.2 m/s ± 0.1 m/s.

0.5 m/s ± 0.1 m/s.

1.0 m/s ± 0.1 m/s.

2.0 m/s ± 0.1 m/s.

• Record any positive alarm indication using the alarm indication detector as each y-axis scan is being performed.

• The above steps shall be repeated nine times for a total of 10 trials at each scan speed, and the results shall be recorded.

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6.5.5 Repeatability Test

The purpose of this test is to assess the WTMD capability to detect each appropriate test object every time it is passed through the portal.

6.5.5.1 The WTMD shall be tested according to Section 6.5.4, Speed Test, with the modification that only one scan speed shall be used: 1.0 m/s ± 0.5 m/s. The WTMD shall be tested at the minimum detection condition for each appropriate MD Class for for 50 consecutive trials under the following conditions:

• The delay between subsequent trials of a given test object shall be no more than 5 seconds.

• The WTMD sensitivity shall not be readjusted between trials of a given test object or between trials of the test objects of a given MD Class.

6.5.5.2 Observations and results shall be recorded.

6.5.6 Discrimination Test

The purpose of this test is to assess the WTMD capability to not detect innocuous test objects


• Set the computer program to perform a y-axis scan of length equal to the portal depth + 0.2 m (with a tolerance of ± 0.5 cm) and symmetric about the detector plane at the x-axis position of 0 cm ± 0.5 cm and z-axis position of 60 cm ± 0.5 cm. The y-axis scan speed shall be 1.0 m/s ± 0.1 m/s.

• Attach the three-axis positioning system to the innocuous item test object holder at the designated location on the innocuous item test object holder.

• Perform the y-axis scan and record any positive alarm indication using the alarm indication detector as the y-axis scan is being performed.

6.5.7 Alarm Indication Timing Test

6.5.7.1 The purpose of this test is to assess that the alarm indication is not activated until the test object passes the portal entry face and remains activated only until the test object passes the portal exit face.


• A total of three trials shall be performed with the z-axis position of the test object being different for each trial and as specified below:

1) 80 cm ± 0.5 cm.

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2) 145 cm ± 0.5 cm. 3) 180 cm ± 0.5 cm.

• Set the computer program to perform a y-axis scan of length equal to the portal depth + 0.2 m (with a tolerance of ± 0.5 cm) symmetric about the detector plane and at the minimum detection condition. The test object travel speed shall be set at 1 m/s ± 0.1 m/s.

• Trigger the waveform recorder to acquire data from the channel to which the alarm indication detector is connected from the start of the scan to the end of the scan. Perform the forward-going y-axis scan. Record as tenter the time at which the test object passes the portal entry face. Record as t1 the time at which the alarm indication is activated. Record as t2 the time at which the alarm indication ceases. Record as texit the time at which the test object passes the portal exit face.

• Repeat the forward-going y-axis scan changing the z-axis position of the test object.

• Record all results and observations.

6.5.8 Throughput Rate Test

The purpose of this test is to assess the WTMD capability to be ready within a specified time to detect a test object after an innocuous test object has passed through the portal.

6.5.8.1 Initial procedures

• Position the test object support platform so that the detector axis is parallel to and the detector plane perpendicular to the top surface of the support platform, and the z-axis of the detector is centered ± 1 cm in both the width and the length of the support platform.

• This procedure requires two test objects: (1) belt buckle innocuous test object and (2) MD Class 1 or MD Class 2 test object, as appropriate.


• Set the computer program to perform a y-axis scan of length equal to 1.4 m (with a tolerance of ± 0.5 cm) and symmetric about the detector plane at the specified measurement conditions.

• Attach the belt buckle innocuous test object to the positioning system such that the belt buckle passes through the portal first and the relative spacing of the test objects is equal to the portal depth + 0.2 m (with a tolerance of ± 0.5 cm). Set the x and z coordinates of the test object location to 0 cm ± 1 cm and 80 cm ± 1 cm respectively.

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• Perform the forward-going y-axis scan at 1.0 m/s ± 0.1 m/s.

• Record any positive alarm indication using the alarm indication detector as the y-

axis scan is being performed, and record the time at which the y-axis scan terminated.

• Repeat the y-axis scan 9 times in the forward direction for a total of 10 trials.

6.5.9 Alarm Reset Test

The purpose of this test is to assess the WTMD capability to be ready within a specified time to detect another test object after a first test object has been detected.

6.5.9.1 Initial procedures

• Position the test object support platform so that the detector axis is parallel to and the detector plane perpendicular to the top surface of the support platform, and the z-axis of the detector is centered ± 1 cm in both the width and the length of the support platform.

• This procedure requires two test objects of the appropriate MD Class. These objects are referred to within this test as “Object A” and “Object B”. The test objects to be used for each MD Class are specified below:

MD Class 1: Steel handgun. MD Class 2: Aluminum knife. MD Class 3: Nonferromagnetic knife.

• For a WTMD that is classified to detect multiple MD Classes simultaneously,

Object A shall be of the MD Class producing the highest detection response, and Object B shall be of the MD Class producing the lowest detection response. For example, if a WTMD is classified to detect MD Class 1, MD Class 2, and MD Class 3, then Object A shall be the MD Class 1 test object, and Object B shall be the MD Class 3 object.


• Set the computer program to perform a y-axis scan of length equal to 1.4 m (with a tolerance of ± 0.5 cm) and symmetric about the detector plane.

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• Attach the test objects to the positioning system such that Object A passes through the portal prior to Object B and such that the relative spacing of the test objects is equal to the portal depth + 0.2 m (with a tolerance of ± 0.5 cm). Set the x and z coordinates of the test object location to 0 cm ± 1 cm and 80 cm ± 1 cm respectively.


• Perform the forward-going y-axis scan at 0.5 m/s ± 0.1 m/s.

• Record any positive alarm indication using the alarm indication detector as the y-

axis scan is being performed, and record the time at which the y-axis scan terminated.

• Repeat the forward-going y-axis scan nine times.

6.6 WTMD Demonstration Test


• Ensure that the required test equipment and components (e.g., voltmeter, alarm indication detector and three-axis positioning system) are connected to the computer controller and that the detection signal output connector is connected to the voltmeter for analog signals or to the computer for digital signals.

• Turn on the required test equipment and verify proper operation of the measurement system.

• Ensure that the WTMD is securely located and positioned in the measurement coordinate system.

• Adjust the WTMD to the appropriate sensitivity setting.

• Attach the test object of the appropriate MD Class with the proper orientation to the positioning system.

• Ensure that the test object does not hit any objects while in motion.

• Turn on the WTMD and ensure that its output functions properly by noting a change in the alarm indicator detector reading and activation of the alarm indication as an MD Class 1 test object is passed through the portal.

6.6.2 Test procedure

• Set the computer program to perform a y-axis scan of length equal to the portal depth + 0.2 m (with a tolerance of ± 0.5 cm) and symmetric about the detector plane at the minimum detection condition. The y-axis scan speed shall be 1.0 m/s ± 0.1 m/s.

• Record any positive alarm indication using the alarm indication detector as the y-axis scan is being performed.

• The test shall be performed 10 times, and the results shall be recorded.

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6.7 Operator Control Test

6.7.1 The power on/off switch shall be cycled and the WTMD shall be observed to cease to function during power off and be observed to function during power on. Functionality shall be checked by passing an MD Class 1 test object through the WTMD and observing an alarm indication. Observations and results shall be recorded.

6.7.2 The audible alarm shall be disabled and the WTMD shall be observed to not give an audible alarm indication when an MD Class 1 test object is passed through. The audible alarm shall then be enabled and the WTMD shall be observed to provide an audible alarm indication when the same test object is passed through. Observations and results shall be recorded.

6.8 Program Storage Test

6.8.1 Remove or disconnect the battery backup unit from the WTMD. Connect the WTMD to AC power and switch on the WTMD. Ensure the WTMD is operating properly by noting an alarm indication when an MD Class 1 test object is passed through the portal. Set the WTMD to operate for a specific MD Class and record all program parameters stored by the WTMD. Disconnect the WTMD from the AC power and leave it disconnected for approximately 5 minutes. Reconnect the WTMD to the AC power and turn it on. Record program parameters and compare to those parameters recorded prior to AC power interruption.

6.9 Audible Alarm Indicator Test

6.9.1 Test Procedure

• Perform the test in an anechoic chamber or at an outdoor location, at least 6 m (20 ft) from any large object, where the ambient sound pressure level at the time of the test is not more than 53 dBSPL.

• Position the sound pressure level meter microphone 0.80 m (31 in) from the detector.

• Measure the sound pressure level with the detector power applied and the alarm indicator in the nonalarm state.

• Cause the WTMD to produce an alarm and again measure the sound pressure level.

• Observations and the sound pressure levels shall be recorded.

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6.10 Visible Alarm Indicator Test

6.10.1 Test Procedure

• Position the WTMD with its alarm indicator 0.80 m ± 0.05 m from the eyes at a test site where the ambient illumination is 10,000 lm/m2 ± 1000 lm/m2.

• After waiting at least 3 minutes to allow for eye accommodation, turn on the WTMD and move a metal object near enough to the WTMD to cause an alarm.

• Observe the indication.

• Repeat the test at a test site where the ambient illumination is 25 lux ± 2.5 lux.

• Observations and results shall be recorded.

6.11 Metal Object Detection Alarm Indicator Test

6.11.1 Pass an MD Class 1 test object through the WTMD portal at a speed greater than or equal to 0.2 m/s and less than or equal to 2.0 m/s. The test object shall pass through the detector portal at the detector axis +/- 10 cm. The result of this test is a pass if a positive alarm indication is obtained from both the visible and audible alarm indicators.

6.12 System Status Alarm Indicator Test

6.12.1 The WTMD manufacturer shall provide a means to force the WTMD into a system failure. While the WTMD is in a system failure mode, observe whether the system status alarm is activated. Remove the failure mode and observe whether the system status alarm is not activated. Observations and results shall be recorded.

6.13 Detection Ready State Alarm Indicator Test

6.13.1 The WTMD power shall be cycled from off to on, and it shall be observed that the WTMD enters a ready mode by not displaying a ready state violation alarm indication.

6.13.2 A clean tester shall carry an MD Class 1 test object through the portal. Ensure the WTMD is operating properly by noting a positive alarm indication when the test object passes through the portal. Also note whether the detection ready state violation alarm indication is activated immediately after the clean tester passes through the portal.

6.13.3 Once the alarm indication is deactivated, the clean tester shall carry an MD Class 1 test object through the portal. Again, note activation followed by deactivation of the detection ready state violation alarm indication.

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6.13.4 Observations and results shall be recorded.

6.14 Speed Range Violation Alarm Indicator Test (Optional)

6.14.1 A clean tester shall pass through the portal at a speed below 0.2 m/s ± 0.1m/s and again above 2.0 m/s ± 0.1 m/s. The speed range violation alarm indicator shall indicate a violation on each pass.

6.14.2 Observations and results shall be recorded.

6.15 Electrical Tests

6.15.1 AC Power Test

6.15.1.1 Connect the WTMD to an AC power source at highest rated supply voltage plus 10% at nominal frequency and switch the WTMD on. Perform the WTMD Demonstration Test as specified in Section 6.6. Switch the WTMD off and disconnect from the AC power source. Observations and results shall be recorded.

6.15.1.2 Connect the WTMD to an AC power source at lowest rated supply voltage minus 10% at nominal frequency and switch on the WTMD. Perform the WTMD Demonstration Test as specified in Section 6.6. Switch the WTMD off and disconnect from the AC power source. Observations and results shall be recorded.

6.15.1.3 Connect the WTMD to an AC power source at nominal voltage at 5% less than the lowest rated supply frequency and switch the WTMD on. Perform the WTMD Demonstration Test as specified in Section 6.6. Switch the WTMD off and disconnect from the AC power source. Observations and results shall be recorded.

6.15.1.4 Connect the WTMD to an AC power source at nominal voltage at 5% greater than the highest rated supply frequency and switch the WTMD on. Perform the WTMD Demonstration Test as specified in Section 6.6. Switch the WTMD off and disconnect from the AC power source. Observations and results shall be recorded.

6.15.2 Battery Backup Test

6.15.2.1 Connect the WTMD to an AC power source at nominal voltage and switch the WTMD on. Disconnect the AC power source so that battery backup power automatically switches on. Perform the WTMD Demonstration Test as specified in Section 6.6 repeatedly for 20 min ± 0.5 min.


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6.16 Test for Operation Near a Stationary Metal Object

6.16.1 Test Equipment

6.16.1.1 Metal test panel. The metal test panel shall be cold-finished sheet carbon steel AISI C1015 to C1020 with dimensions of 1 m ± 0.01 m by 1 m ± 0.01 m by 1.25 mm ± 0.13 mm and may be mounted in a nonelectrically conductive, nonmagnetizable frame to prevent bowing and bending of the metal test panel.

6.16.2 Test procedure.

6.16.2.1 The metal test panel shall be positioned such that its large surfaces are perpendicular to the detector plane, the x-axis of the measurement coordinate system passes through the center of the metal test panel and the x-axis separation between the metal test panel and the closest surface of the WTMD is 30 cm ± 1 cm.

6.16.2.2 Any positive alarm indication shall be recorded after the panel is positioned. Perform the WTMD Demonstration Test, as specified in Section 6.6, without moving the metal test panel. Perform the test on both sides of the portal.


6.16.3 A clean test subject shall walk through the center of the portal at a speed of approximately 1.0 m/s. Any positive alarm indication using the alarm indication detector shall be recorded as the clean test subject passes through the portal.

6.17 Test for Operation Near a Steel Floor


6.17.1.1 Metal test panel, steel reinforced floor. The metal test panel is as described in Section 6.16.1.1.


6.17.2.1 Position the metal test panel such that it is parallel to and 10 cm ± 1 cm below the detector floor, allowing the necessary time for automatic adjustment. Any positive alarm indication after the panel is positioned shall be recorded.

6.17.2.2 Readjust the floor gain control of the WTMD, if necessary, and note the new gain settings.

6.17.2.3 Perform the WTMD Demonstration Test, as specified in Section 6.6, without moving the metal test panel.


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6.18 Test for Operation Near Steel Reinforced Floor


6.18.1.1 Steel reinforced floor test panel. The test floor shall be constructed of 1.6 cm ± 0.1 cm diameter steel AISI C1015 to C1020 rod. The rod shall be arranged to form a square grid pattern with overall dimensions of 1 m ± 0.01 m by 1 m ± 0.01 m. The rod shall be placed on a 30 cm ± 0.01 m by 30 cm ± 0.01 m center-to-center square grid spacing.


6.18.2.1 Position the metal test panel such that it is parallel to and 10 cm ± 1 cm below the detector floor (see Figure 1), allowing the necessary time for automatic adjustment.

6.18.2.2 Any positive alarm indication after the panel is positioned shall be recorded.

6.18.2.3 Readjust the floor gain control of the WTMD, if necessary, and note the new gain settings.

6.18.2.4 Perform the WTMD Demonstration Test, as specified in Section 6.6, without moving the metal test panel.


6.19 Metallic Moving Object Test (Metal Door Interference Test)


6.19.1.1 Metal test door. The metal test door shall consist of a metal plate made of cold-finished sheet carbon steel AISI C1015 to C1020 with dimensions of 2 m ± 0.02 m by 1 m ± 0.02 m by 2 mm ± 0.2 mm attached with hinges to a stationary wooden frame such that the metal plate can swing 180° without obstruction.


6.19.2.1 Position the metal test door such that the plane of the door is parallel to the detector plane and the edge of the door in its closest possible position is 2 m ± 0.1 m from the closest surface of the WTMD.

6.19.2.2 Rotate the metal test door 90° in one direction and then rotate the metal test door180° in the opposite direction in 4 s ± 1 s.

6.19.2.3 Any positive alarm indications shall be recorded.

6.19.2.4 Rotate the metal test door back and forth as specified in Section 6.19.2.2, while passing an appropriate MD Class test object through the portal.

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6.19.2.5 Any failure to provide a positive alarm indication when the test object is passed through the portal shall be recorded.

6.20 Multiple Object Interference Test


6.20.1.1 Ensure that the alarm indication detector and three-axis positioning system are connected to the computer controller.

6.20.1.2 Turn on the alarm indication detector, the computer controller and the three-axis positioning system and verify proper operation of the measurement system.

6.20.1.3 Ensure that the WTMD is securely located and positioned within the measurement coordinate system.

6.20.1.4 Adjust the WTMD to the appropriate sensitivity setting.

6.20.1.5 Attach the test object with the proper orientation to the three-axis positioning system.

6.20.1.6 Turn on the WTMD and ensure that its output functions properly by noting a change in the alarm indication detector reading as a metal object is brought near the portal region.

6.20.1.7 Ensure that the test object does not hit any objects while in motion.

6.20.1.8 Attach the MD Class 1 steel handgun replica with Orientation 2 (see mechanical drawing of the encased test object, NIJ Report 100-07) to the three-axis positioning system.

6.20.1.9 Attach the MD Class 1 aluminum handgun replica (using the same orientation as that of the steel handgun replica) to the steel handgun replica using nonelectrically conductive nonmagnetic tape so that the aluminum handgun is to the right of the steel handgun and making maximum physical contact.

6.20.2 Test procedure

6.20.3 Set the computer program to perform a y-axis scan of length equal to the portal depth + 0.2 m (with a tolerance of ± 0.5 cm) and symmetric about the detector plane. The y-axis scan speed shall be 1.0 m/s ± 0.1 m/s, and the y-axis scan shall occur at the x-axis position of 0 cm ± 1 cm centered on the z-axis at the z-axis position of 80 cm ± 1 cm.

6.20.4 Perform the y-axis scan and record any positive alarm indication using the alarm indication detector as the y-axis scan is being performed.

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6.20.5 Repeat the y-axis scan for the z-axis position of 110 cm ± 1 cm and 130 cm ± 1 cm and record any positive alarm indication using the alarm indication detector as the y-axis scan is being performed.

6.21 Mechanical Resistance to Shock Test

6.21.1 The WTMD shall be tested for mechanical shock in accordance with the requirements of IEC 60068-2-27:2008, as amended, using the half-sine pulse shape with a nominal peak acceleration of 5 g (50 m/s2) and nominal pulse duration of 30 ms. Observations and results shall be recorded.

6.22 Indoor or Sheltered Outdoor Temperature Stability and Range Test

6.22.1 The WTMD shall be conditioned in accordance with MIL-STD-810F:2000 Method 501.4, Procedure II, at 46°C ± 3°C for 24 hours ± 1 hour. After being exposed to that temperature continuously for 24 hours ± 1 hour, perform the WTMD Demonstration Test, as specified in Section 6.6. The WTMD then shall be cooled to 0°C ± 3°C within 4 hours ± 0.5 hour. After being exposed to that temperature continuously for 24 hours ± 1 hour, perform the WTMD Demonstration Test, as specified in Section 6.6.

6.23 Outdoor Temperature Stability and Range Test

6.23.1 The WTMD shall be conditioned in accordance with MIL-STD-810F:2000 Method 501.4, Procedure II, at 65°C ± 3°C for 24 hours ± 1 hour. After being exposed to that temperature continuously for 24 hours ± 1 hour, perform the WTMD Demonstration Test, as specified in Section 6.6. The WTMD then shall be cooled to -37 °C ± 3°C within 4 hours ± 0.5 hour. After being exposed to that temperature continuously for 24 hours ± 1 hour, perform the WTMD Demonstration Test, as specified in Section 6.6.

6.24 Relative Humidity Stability and Range Test

6.24.1 The WTMD shall be conditioned in accordance with the requirements of IEC 60068-2-30, as amended. The most severe test described in IEC 60068-2-30, Section 5.2 b shall be used: six cycles at 55˚C. The temperature transition set forth in IEC 60068-2-30, Section 7.3.3, Variant 2 shall be followed. After conditioning, perform the WTMD Demonstration Test, as specified in Section 6.6.

6.25 Environmental Protection, Indoor Test

6.25.1 The WTMD shall be tested as specified in IEC 60529, Classification IP41.

6.26 Environmental Protection, Sheltered Outdoor Test


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6.27 Environmental Protection, Outdoor Test


6.28 Radiated Emissions Test

6.28.1 The WTMD shall be tested as specified in CISPR 22:2008, Class B, as amended, for the frequency ranges and limits given in Table 1 of IEC 61000-6-3:2006, as amended. Observations and results shall be recorded.

6.29 Conducted Emissions Test

6.29.1 The WTMD shall be tested as specified in CISPR 22:2008, Class B, as amended, for the frequency ranges and limits given in Table 1 for the AC Mains Port of IEC 61000-6-3:2006, as amended. Observations and results shall be recorded.

6.29.2 The WTMD shall be tested as specified in CISPR 22:2008, Class B, as amended, for the frequency ranges and limits given in Table 1 for the Signal, Control, DC Power Input or Output Ports of IEC 61000-6-3:2006, as amended. Observations and results shall be recorded.

6.30 Radiated Magnetic Field Test (Low-Frequency Magnetic Field Susceptibility Test)

6.30.1.1 Place the WTMD on the detector platform and mark on the detector platform (and surrounding area, depending on the size of the detector platform) three lines that are parallel to the detector plane and the detector floor. Locate these lines so that the middle line is coplanar with the detector plane and the other two lines are on opposite sides of this middle line and separated from the middle line by 30 cm ± 1 cm.

6.30.1.2 Ensure that the test probe (see Section 6.3.13) is oriented so that its axis is parallel to the detector plane and detector floor with a tolerance of 5°.

6.30.1.3 Program the signal source to provide the 60 Hz signal described in Section 6.3.14 and connect the test probe to the signal source. Ensure that the probe is being excited by the signal source by placing a second and similarly constructed probe next to the test probe. Connect the second test probe to an oscilloscope or spectrum analyzer and verify the test probe is receiving a signal from the signal source.

6.30.1.4 Position the test probe so that its axis is coplanar to within 1 cm with the leftmost marked line, 10 cm ± 1 cm above the detector floor and 2 m ± 10 cm from the outer surface of the WTMD.

6.30.1.5 Move the test probe toward the WTMD at a speed of 0.2 m/s ± 0.1 m/s while changing its vertical position or coplanarity by no more than 1 cm and record the distance, di, from the WTMD, at which the WTMD provides a positive alarm indication.

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6.30.1.6 Repeat Section 6.30.1.5 four additional times.

6.30.1.7 Record the average position, 10,ld , for the leftmost line using Equation 1:

Equation 1: Average position.

,5

1,10, ∑

=

=i

ill dd

where the l subscript refers to the leftmost line.

6.30.1.8 Repeat sections 6.30.1.4 through 6.30.1.7 except with the test probe axis is at a height above the detector floor of 100 cm ± 10 cm and obtain the average position, 100,ld , at a height of 100 cm ± 10 cm, at which the WTMD provides a positive alarm indication.

6.30.1.9 Repeat sections 6.30.1.4 through 6.30.1.7 except with the test probe at a height above the detector floor of 200 cm ± 10 cm and obtain the average position, 200,ld , at a height of 200 cm ± 10 cm, at which the WTMD provides a positive alarm indication.

6.30.1.10 Repeat sections 6.30.1.4 through 6.30.1.7 except with the test probe axis aligned with the middle line but at a height of 10 cm ± 1 cm and obtain the average position, 10,md , at which the WTMD provides a positive alarm indication.

6.30.1.11 Repeat sections 6.30.1.8 through 6.30.1.9 except with the test probe axis aligned with the middle line and obtain the average position, 100,md , at a height of 100 cm ± 10 cm, at which the WTMD provides a positive alarm indication, and the average position, 200,md , at a height of 200 cm ± 10 cm, at which the WTMD provides a positive alarm indication.

6.30.2 Repeat sections 6.30.1.10 and 6.30.1.11 except with the test probe located at the rightmost line and obtain the average position, 10,rd , at a height of 10 cm ± 1 cm, at which the WTMD provides a positive alarm indication; the average position, 100,rd , at a height of 100 cm ± 10 cm, at which the WTMD provides a positive alarm indication; and the average position, 200,rd , at a height of 200 cm ± 10 cm, at which the WTMD provides a positive alarm indication.

6.30.3 Repeat sections 6.30.1.4 through 6.30.1.7, except with the test probe axis aligned perpendicular to the middle line but at a height of 200 cm ± 1 cm and obtain the average position, 200,cd , at which the WTMD provides a positive alarm indication.

6.30.4 Program the signal source to provide the 15.75 kHz signal described in Section 6.3.14 and connect the test probe to the signal source. Ensure that the probe is being excited

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by the signal source by placing a second and similarly constructed probe next to the test probe. Connect the second test probe to an oscilloscope or spectrum analyzer and verify the test probe is receiving the signal transmitted from the signal source. Repeat sections 6.30.1.4 through 6.30.3.

6.30.5 Program the signal source to provide the 40 kHz signal described in Section 6.3.14 and connect the test probe to the signal source. Ensure that the probe is being excited by the signal source by placing a second and similarly constructed probe next to the test probe. Connect the second test probe to an oscilloscope or spectrum analyzer and verify the test probe is receiving the signal transmitted from the signal source. Repeat sections 6.30.1.4 through 6.30.3.

6.30.6 Program the signal source to provide the 20 Hz pulse signal described in Section 6.3.14 and connect the test probe to the signal source. Ensure that the probe is being excited by the signal source by placing a second and similarly constructed probe next to the test probe. Connect the second test probe to an oscilloscope or spectrum analyzer and verify the test probe is receiving the signal transmitted from the signal source. Repeat sections 6.30.1.4 through 6.30.3.

6.31 Radiated RF Electromagnetic Field Immunity Test

6.31.1 The WTMD shall be tested as specified in IEC 61000-4-3:2008, as amended, for Level 2 (3V/m), for the requirements given in Table 1, Entry 1.2, of IEC 61000-6-1:2005, as amended. Observations and results shall be recorded.

6.32 60 Hz Radiated Magnetic Field Test

6.32.1 The WTMD shall be tested as specified in IEC 61000-4-8:2001, as amended, for testing at 60 Hz, Level 2 (3A/m), and continuous exposure for 30 min ± 5 min for the requirements given in Table 1, Entry 1.1, of IEC 61000-6-1:2005, as amended. Observations and results shall be recorded.

6.33 Electrostatic Discharge Test

6.33.1 The WTMD shall be tested as specified in IEC 61000-4-2:2001, as amended, for the requirements given in Table 1, Entry 1.5, of IEC 61000-6-1:2005, as amended. Observations and results shall be recorded.

6.34 Fast Transients Test

6.34.1 The WTMD shall be tested as specified in IEC 61000-4-4:2004, as amended, for the requirements given in Table 2, Entry 2.2; Table 3, Entry 3.3; and Table 4, Entry 4.5, of IEC 61000-6-1:2005, as amended. Observations and results shall be recorded.

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6.35 Surge Test

6.35.1 The WTMD shall be tested as specified in IEC 61000-4-5:2005, as amended, for the requirements given in Table 3, Entry 3.2 and Table 4, Entry 4.4, of IEC 61000-6-1:2005, as amended. Observations and results shall be recorded.

6.36 RF Common Mode Test

6.36.1 The WTMD shall be tested as specified in IEC 61000-4-6:2006, as amended, for the requirements given in Table 2, Entry 2.1; Table 3, Entry 3.1; and Table 4, Entry 4.1, of IEC 61000-6-1:2005, as amended. Observations and results shall be recorded.

6.37 Voltage Interruptions and Dips Test

6.37.1 The WTMD shall be tested as specified in IEC 61000-4-11:2004, as amended, for the requirements given in Table 4, entries 4.2 and 4.3, of IEC 61000-6-1:2005, as amended. Observations and results shall be recorded.

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7. LABELING AND INFORMATION

7.1 General Product Label Requirements 7.1.1 The WTMD shall have product labels permanently and visibly attached to, stamped

on or printed on the WTMD.

7.1.2 All text on the required product label shall be at least in English.

7.1.3 At least the following information shall also be printed legibly on the product label(s) in letters at least 3.2 mm (0.125 in) high:

• Legal name of the WTMD manufacturer and phone number or email address.

• Model, style and serial number.

• MD Class(es).

• Date of manufacture.

• Intended operating environment (indoor, sheltered outdoor or outdoor).

• Power requirements.

7.2 User Information to Be Provided by the Manufacturer of the WTMD 7.2.1 The WTMD manufacturer shall provide user information including, but not limited

to, warnings, information and instructions with each WTMD.

7.2.2 The WTMD manufacturer shall provide at least the following user information with each WTMD:

• MD Class and intended operating environment.

• Description of controls and adjustments.

• Description of detection principles and WTMD capabilities.

• List of operating features.

• Instructions for proper use and installation as intended by the WTMD manufacturer, including placement and safety considerations.

• Technical specifications containing, at a minimum, the following information:

o Each class for which the WTMD qualifies.

o WTMD dimensions and weight.

o Operating ambient temperature range.

o Battery backup operational time.

• Calibration instructions.

• Field test and performance verification procedures.

• Warranty information.

• WTMD manufacturer contact information, including address of

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manufacturing location (city, state/province, country) and phone number.

• Care and maintenance4 instructions, including guidelines for inspection, proper storage recommendations, and a detailed list of the technical skills, computer hardware and software tools required.

7.2.3 The WTMD manufacturer shall have available a training package that will provide operators with the information necessary to acquire the technical and operational skills required to conduct effective screening with the device.

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4 See definitions for care and maintenance in Chapter 3.


APPENDIX: Innocuous Item Test Objects

MD Class 1 Innocuous Item Test Objects. The innocuous item test objects for the MD Class 1 are a set of coins and replicas of a set of coins, a belt buckle, eyeglasses and a watch.

• Set of coins. The set of coins shall consist of two each of U.S. pennies, nickels, dimes and quarters minted between the years 1990 and 2000.

• Belt buckle. The replica of the belt buckle shall be a continuous circle made from a rod of stainless steel, classification UNS S30400, with the rod having a diameter of 6.4 mm ± 0.4 mm, and the circle an inside diameter of 50 mm ± 5 mm.

• Eyeglasses. Figure 5 provides the mechanical drawings for the eyeglasses replica.

• Watch. The watch replica shall be made from a disc-shaped object with the following properties:

• Diameter: 30 mm ± 5 mm

• Thickness: 5 mm ± 1 mm

• Material: UNS S30400

MD Class 2 Innocuous Item Test Objects. The innocuous item test objects for the MD Class 2 are replicas of eyeglasses (see Figure 5) and a belt buckle. The belt buckle shall be a continuous circle made from a rod of stainless steel, classification UNS S30400, with the rod having a diameter of 3.0 mm ± 0.4 mm, and the circle an inside diameter of 30 mm ± 5 mm.

MD Class 3 Innocuous Item Test Objects. There are no innocuous item test objects for the MD Class 3.

Innocuous item test object holder. Figure 6 shows the location of the innocuous item test objects on the innocuous item test object holder and the subsequent mechanical drawings are of the parts of the innocuous item test object holder and its assembly (to be added). All components of the holder shall be constructed of nonelectrically conductive and nonmagnetic materials.

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48

Figure 5. Mechanical Drawing of Eyeglass Replica

NATIONAL INSTITUTE

OF

STANDARDS AND TECHNOLOGY


49

Figure 6: Innocuous Item Test Object Locations.

Documents

Walk-Through Metal Detector Standard for Public Safety - JustNet