Telewave Wattmeter Model 44A/APTelewave, Inc. Model 44A/AP Page 5 3 PHYSICAL DESCRIPTION 3.01 The controls and indicators of the Model 44A/AP Broadband RF Wattmeter are illustrated

Model 44A/APBROADBAND RFWATT METER

OPERATION MANUAL

®

Telewave, Inc.Model 44A/AP

Page 1

MODEL 44A/AP BROADBAND RF WATTMETERDESCRIPTION AND OPERATION

CONTENTS PAGE

1. SPECIFICATIONS 2

2. GENERAL DESCRIPTION 3

3. PHYSICAL DESCRIPTION 5

4. FUNCTIONAL DESCRIPTION

Schematic and Parts List 6 Functional Description 7 Accessory List 8

5. OPERATION

Unpacking and Connections 9 Power Measurements 10 VSWR Calculations 11 True Power at Load Calculation 11 Directivity and Insertion Error 12

6. MAINTENANCE

Warranty Service and Calibration 13 Parts Location 14 Calibration / Adjustment Procedure 15

7. REFERENCE

VSWR Nomograph 17 Low Frequency Correction Chart 18 Jumper Cable Cutting Chart 19

Telewave, Inc. • 660 Giguere Court • San Jose, CA 951331-800-331-3396 • 408-929-4400 • www.telewave.com

TWDS-8007 Rev. 3/11 • All Contents © 2011 Telewave, Inc.

Page 2


1 SPECIFICATIONS

1.01 Table 1-1 lists specifications for the Telewave Model 44A/APBroadbandRFWattmeter.Theseareprovidedtoassisttheuserinformulatingacceptancecriteria,determiningapplications,andforperiodic recalibration of the instrument.Minor deviations fromthesespecificationswhichdonotaffectperformanceoftheModel44A/APWattmetershouldnotbeconsideredawarrantyissue.

Table 1-1: Model 44A/AP RF Wattmeter Specifications

Parameter CharacteristicsFrequencyRangeAccuracy:20to150MHz150to1000MHz

20to1000MHz

±6%offullscaleaftercorrection(Fig.7-2)±6%offullscale(SpecifiedwithNconnectorsonly)

PowerRanges 5,15,50,150and500WattsPrimaryLineImpedanceVSWRInsertionLoss

50ohmsnominal1.1maximum0.1dBmaximum

RFSamplePort(44AP) -40dB+/-2dBRFConnectorsStandardOptional

QC-“Quick-Change”typeN-FemaleUHF,BNC,TNC,7-16DINM/FNote: UHFconnectorsreducemeasurementaccuracyinthe400to1000MHzrange.

DimensionsHeightWidthDepthWeight

6.625in.(16.83cm)4in.(10.16cm)3.25in.(8.26cm)3lb.(1.36kg)


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2 GENERAL DESCRIPTION

2.01 Thismanualprovides thephysicaland functionaldescriptionandoperatingtheorynecessaryforeffectiveuseoftheTelewaveModel44A/APBroadbandRadioFrequency(RF)Wattmeter.Itsfeaturesinclude:

•Displaysfivepowerranges

•Measures1to500watts

•Doesnotrequireinserts•Doesnotrequirebandswitching

•Fullyoperableinfreezingconditions

•Provides5wattsfullscalerange

•Interchangeableconnectors(QC)

•Lightweight,ruggedandeasytocarry

•-40dBRFsamplingport(Model44AP)

2.02 The instrument integrates two broadband directional couplers formeasuring incident and reflected power, ranging, calibration anddisplay.Thewidecoverageanddynamicrangeofthisinstrumenteliminates any inserts or band switching.A20uA taut bandme-termovementisusedtodisplaythemeasuredpower,providingthemeasurementaccuracynecessarytotunelowpowerportabletrans-mitters.

2.03 Aconvenient, easy to read, voltage standingwave ratio (VSWR)chart is provided on the rear of the instrument for determiningVSWRfromthemeasuredincidentandreflectedpowerlevels.Theinstrumentisdesignedforruggedfielduseandishousedinadiecastmetalcasewithaleathercarryingstrap.Themeasurementcircuitsinthewattmeteraredrivendirectlybythecurrentdevelopedinthecoupler,makingitunnecessarytosupplyACpowerorbatteries.Acarryingcase(ModelTC44)isavailableasanoption.TheModel44A/AP is ideallysuited formobile,marine,andaircraftapplica-tionsaswellasbasestations.

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1

87

65

4

3

2

Figure 2-1: Model 44A/AP Broadband RF WattmeterControls and Indicators

9

10


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3 PHYSICAL DESCRIPTION

3.01 Thecontrols and indicatorsof theModel44A/APBroadbandRFWattmeterareillustratedinFigure2-1,andthefunctionsof theseelementsaredescribedinTable3-1.

Key Item Description

1 CarryStrap Forcarryingorhangingtheinstrument.

2 IdentificationLabel Containsmodel and serial numberof theinstrument.

3 Meter Displaysmeasuredpower.

4 SamplePort Connection point for external measure-mentorsignalinjection(Model44AP).

5 InputConnector

ConnectionpointfortheRFsource,suchas an RF power amplifier or transmitter.Mates with Type N or UHF connector(typical).

6 OutputConnectorConnectionfortheRFload,suchasanan-tennaordummyload.MateswithTypeNorUHFconnector(typ.)

7 ModeSwitch

(1)OFF– Transit. Provides protectionfor meter during instrumentmovement.

(2)FWD– Displaysforwardorincidentpower.

(3)REV– Displaysthereflectedpower.

8 PowerRangeSwitch Selectsoneof5fullscalepowerranges.

9 VSWRChartProvides a method to calculate VSWRfrom themeasured forward and reflectedpower.

10 CorrectionFactorProvidesamethodtodeterminethescalecorrection for measurements below 150MHz.

Table 3-1 : Model 44A/AP Description

Page 6


Figure 3-1: Model 44A/AP RF Wattmeter Schematic

R2

R16

R12

R8

R4

R15

R11

R7

R3

R18R17

R14R13

R10R9

R6R5

S1

S2

OFFREVFWD

M1+ -

500

150

50

15

5

500

150

50

15

5

RFSOURCE

RFLOAD

Dual Directional Coupler

R1

JP JP

CU1 CU2

Table 3-2 : Model 44A/AP Parts ListREF DESCRIPTION MFG MFG P/N

CU1,2 COUPLER HEAD ASSEMBLY TELEWAVE 7988M1 METER: 20 UA TRIPLETT 7034MP1 KNOB RAYTHEON MS-91528-1P2BMP2 SCREW: BUMPER 6-32 TELEWAVE TB44MP6 STRAP: LEATHER TELEWAVE HH44MP8 SCREW: TRUSS HEAD 10-52 ICO/RALLY SCR-813MP9 SHOCK RING: EDM TELEWAVE 7099QC N FEMALE CONNECTOR TELEWAVE QC44NQC UHF FEMALE CONNECTOR TELEWAVE QC44SQC BNC FEMALE CONNECTOR TELEWAVE QC44BQC TNC FEMALE CONNECTOR TELEWAVE QC44TQC 7-16 DIN FEMALE CONNECTOR TELEWAVE QC44DR1 RESISTOR: VAR CC 0.25W 10/% 2.5K OHMR2 RESISTOR: VAR CC 0.25W 10/% 2.5K OHMR3 RESISTOR: VAR CC 0.25W 10/% 10K OHMR4 RESISTOR: FXD CC 0.50W 5/% 1.8K OHMR5 RESISTOR: FXD CC 0.50W 5/% 1.8K OHMR6 RESISTOR: VAR CC 0.25W 10/% 10K OHMR7 RESISTOR: VAR CC 0.25W 10/% 25K OHMR8 RESISTOR: FXD CC 0.50W 5/% 13K OHMR9 RESISTOR: FXD CC 0.50W 5/% 13K OHMR10 RESISTOR: VAR CC 0.25W 10/% 25K OHMR11 RESISTOR: VAR CC 0.25W 10/% 25K OHMR12 RESISTOR: FXD CC 0.50W 5/% 30K OHMR13 RESISTOR: FXD CC 0.50W 5/% 30K OHMR14 RESISTOR: VAR CC 0.25W 10/% 25K OHMR15 RESISTOR: VAR CC 0.25W 10/% 25K OHMR16 RESISTOR: FXD CC 0.50W 5/% 62K OHMR17 RESISTOR: FXD CC 0.50W 5/% 62K OHMR18 RESISTOR: VAR CC 0.25W 10/% 25K OHMS1,2 SWITCH: ROTARY 2 POLE 5 POS ELECTROSWITCH D3G0205N-4096


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4 FUNCTIONAL DESCRIPTION

4.01 TheModel44A/APWattmeterismadeupoftwomajorsections.RefertotheschematicdiagraminFigure3-1forthisdescription.

(a)ADualRFDirectionalCouplerwithdirectivityofgreaterthan25dB.

(b)Avoltmetercircuit.Fiverangesareprovided.

4.02 The50ohmDualDirectionalCouplerA1samplesasmallamountoftheincidentorforwardRFpowerdeliveredtotheload.Thecou-pler incorporates twoRF detectorswhich produce aDC voltageproportional to thesampledRFpower.Asmallamountofpowerreflectedfromtheloadisalsosampled.

4.03 ModeSwitchS1determineswhichofthesevoltagesisdisplayedonthemeter,M1.TheRFPowerRangeSwitchS2,selectstheappro-priaterangeandcalibrationresistorsforthepowertobemeasured.Eachrangeisprovidedwithanadjustableinternalpotentiometerforrangecalibration.

4.04 MeterM1displaysfivescaleswhichcorrespondtotheRFPowerRangeSwitchpositions.Thelowerthirdofthemeterscaleisshadedred,alertingtheusertoswitchtoalowerpowerrangeforimprovedaccuracy.AnOFFpositionisprovidedonModeSwitchS1,whichshunts out themetermovement.This provides protection for thesensitivemeterwhentheinstrumentisbeingtransported.

4.05 Model44APprovidesanRFsamplingportwithanoutputof-40dB(+/-2dB)belowthetransitionallineleveltouseformeasurementoffrequency,spectrumanalysis,toinjectasignalformeasurementof receiver sensitivity,orotherapplications.Theport coupling isnotdirectional;inahighVSWRsystem,thesamplingportoutputwillbe -40dBbelow the totalpowerpassing through the instru-ment.

Page 8


Part Number DescriptionTC44 LeathercarrycasewithaccessorypouchTWL-35 CoaxialDryLoad-35wattsTWL-50 CoaxialDryLoad-50wattsTWL-60 CoaxialDryLoad-60wattsTWL-75 CoaxialDryLoad-75wattsTWL-100 CoaxialDryLoad-100wattsTWL-150 CoaxialDryBenchLoad-150wattsTWL-300 CoaxialDryBenchLoad-300wattsQC44B QuickChangeBNC-femaleconnectorQC44D QuickChange7-16DIN-femaleconnectorQC44N QuickChangeN-femaleconnectorQC44S QuickChangeUHF-femaleconnectorQC44T QuickChangeTNC-femaleconnectorANTA-02-5 Jumper-RG-213/U,5ft.,N-MaleANTD-03-5 Jumper-RG-142B/U,5ft.,N-Male

Figure 4-1: Optional TC44 Carrying Case and RF Loads

Optional Accessories

4.06 ThetablebelowliststhemostcommonaccessoriesfortheModel44A/APWattmeter.Consult thecurrentpricelistorourwebsiteforcurrentpricing.


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5 OPERATION

Unpacking

5.01 AftertheModel44A/APWattmeterarrives,examinetheshippingcontainerforvisiblelossordamage.Carefullyunpackthewatt-meterandexaminetheexteriorfordamage.

IMPORTANT

The Model 44A/AP Wattmeter is carefully tested, inspected, and packed before leaving the Telewave factory. Claims for loss or damage sustained in transit should be made upon the carrier, NOT TO Telewave, Inc., as follows:

(1) Visible Loss or Damage - Any evidence must be noted on the freight bill or express delivery sheet. The form required to file such a claim will be supplied by the carrier.

(2) Concealed Loss or Damage - This damage does not be-come evident until after the wattmeter is unpacked. When the damage is discovered, make a written request for in-spection by the carrier’s agent within fifteen (15) days of the delivery date. File a claim with the carrier.

RF Connections

5.02 The following procedurewill assist the user in preparation formakinganRFpowermeasurement.RefertoFigure2-1.

Step Procedure1 RemovetheRFpowerfromthetransmissionline.

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Step Procedure2 SettheRFRangeSwitchtothe500Wattposition.3 ConnecttheRFSourcetotheModel44A/APFWDinput

connector,locatedontheleftsideoftheinstrumentnearestthemodeswitch.

4 ConnecttheRFLoadtotheModel44A/APFWDoutputconnector,locatedontherightsideoftheinstrumentnearesttherangeswitch.

Forward Power Measurement

5.03 Thefollowingprocedurewillassisttheuserinmakinganincidentorforwardpowermeasurement.RefertoFigure2-1.

Step Procedure1 SettheModeSwitchtotheFWDposition.2 ApplyRFpowertothetransmissionline.3 MovetheRFRangeSwitchtoalowerrangeifnecessaryto

obtainareadingintheupperthirdofthescale.4 Notethemeterreading.Applyappropriatecorrectionfactor

ifthefrequencyisbetween20-150MHz.RefertoFigure7-2.

Reflected Power Measurement

5.04 Thefollowingprocedurewillassisttheuserinmakingareflectedorreversepowermeasurement.

Step Procedure1 SettheModeSwitchtotheREVposition.2 RepeatStep2of5.03.3 RepeatStep3of5.03.4 RepeatStep4of5.03.


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VSWR Calculation

5.05 The followingprocedurewill assist theuser indetermining theVoltageStandingWaveRatio.

Step Procedure1 Performtheproceduresoutlined in5.03and5.04.Record the

trueincidentandreflectedpower.2. RefertotheVSWRChartontherearoftheinstrumentorFigure

7-1.ApplythereadingsfromStep1tothechart.3. TheVSWRisreadfromthenearestslopingline.Forhigher

accuracy,calculatetheVSWRbytheformula:

True Power at Load Calculations

5.06 The followingprocedurewill assist theuser indetermining theactualpowerdeliveredtotheload.

Step Procedure1 Performtheproceduresoutlinedin5.03and5.04.Recordthe

trueincidentandreflectedpower.2 Subtractthereflectedpowerfromtheincidentpower.

Thisdifferenceisthetruepowerattheload.

VSWR=

1+PREV(Watts)PFWD(Watts)

1 -PREV(Watts)PFWD(Watts)

Page 12


Directivity Error

5.07 DirectivityerrorresultsfromtheeffectofimperfectdirectivityintheDualDirectionalCoupler.Directivityistheabilityofthecouplertosensepowerflowinginonedirectionandbeinsensitivetoanypowerwhichmaybeflowinginthereversedirection.Thedirectivityerrorisincludedwithinthespecifiedinstrumentaccuracy.

Insertion Error

5.08 WhentheRFloadandRFsourcearewellmatched,anyerrorcon-tributedby inserting theModel44A/APWattmeteralone isnegli-gible.However,theuseofajumpercabletoconnectthewattmeterinthesystemwillchangethecharacteristicimpedanceoftheline,especially ina systemwithhighVSWR.Since the impedanceoneithersideof1/2wavelengthisidentical,thejumpercableaddedtotheinputoroutputoftheModel44A/APshouldbeofanappropriatelengthtoequal1/2wavelengthatthefrequencyofoperation,thuseliminatinganyerrorduetotheadditionallength.

5.09 ThechartshowninFigure7-3showstherequiredlength(includingconnectors)ofRG-213/Ucabletoactasa1/2wavelinesectionatfrequenciesfrom25-500MHz.


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6 MAINTENANCE6.01 TheModel44A/APWattmeterisdesignedwithhighreliabilitycom-

ponentsandoperatesonlowDCpowerlevels.Itcanbeexpectedtooperateatpeakperformanceforlongintervals.PeriodiccalibrationbyTelewaveoranRFstandardlaboratoryisrecommendedtomain-tainpeakinstrumentperformance.

Warranty Service6.02 TheModel44A/APWattmeter is coveredunderTelewave’s stan-

dard 1 yearwarranty. See the inside back cover for exact terms.Faultyunitsshouldbereturnedto:

Telewave, Inc.ATTN: Repairs

660 Giguere CourtSan Jose, CA 95133

1-800-331-3396 / +1 408-929-4400

6.03 A ReturnMaterialAuthorization (RMA) is required when prod-ucts are returned toTelewave.The following informationwill berequestedinordertoassignanRMA:

• TheModel44A/APserialnumber.TheIDplateislocated onthetopoftheinstrument.Includethedateofpurchaseand PurchaseOrdernumberifknown.

• Abriefstatementoftheproblem.

• Contactname,telephonenumber,andreturnshippingaddress.

Calibration6.04 AdjustmentstotheinstrumentshouldbeperformedbyTelewave,or

otherRFcalibrationlaboratory.Calibrationoradjustmentshouldbemadeatafrequencyof467MHzwhenpossible.Ifitisnecessarytoperformcalibrationbelow150MHz,consultFigure7-1forthecorrectionfactor.TheadjustmentpotentiometersarelocatedonthemainPCboardinsidetheinstrument.RefertoFigure3-1and6-1.

Page 14


Figure 6-1: Adjustment Potentiometers and Parts Location

FORWARDRANGESR1 5wattrangeR3 15wattrangeR7 50wattrangeR11 150wattrangeR15 500wattrange

REVERSERANGESR2 5wattrangeR6 15wattrangeR10 50wattrangeR14 150wattrangeR18 500wattrange

CU2CU1

R18 R2 R1 R15

R6 R3

R14 R11R10 R7

R13

R17

R5

R9

R8

R4 R12

R16


Page 15

6.05 Calibration / Adjustment Requirements and Equipment

a) Theambienttemperatureduringcalibrationmustbe72.4 degrees.

b) TheTelewavemetermustbecalibratedintheintendedoperating position,eitherverticalorhorizontal.Metersarecalibratedby Telewaveintheverticalposition.

c) TheTelewavewattmeterandanyinterconnectionsmustuseonly TypeNconnectors.

d) AnRFpowersourcecapableofproducingatleast325watts continuouspowerat467Mhz.

e) Alowpassfiltercapableofhandlingatleastthemaximum continuouspowerusedduringcalibrationmustbeinstalled betweentheRFsourceandtheTelewavemeter.

f) Acalibrateddigitalpowermeterandremotesensor,with accuracyof+/-0.5%orbetter,traceabletoNIST.Insertionloss ofalltestequipmentmustbecharacterized.

g) A50ohminlineattenuatorcapableofhandlingthemaximum continuouspowerthatwillbeusedduringcalibration.

Note:Acorrectionfactorisrequiredformeasurementsatfrequenciesbelow150MHz.ThespecifiedpowerlevelisfedtotheTelewavewatt-meter,andthecorrectpercentagefactorfromthefrequencychartonPage19inthemanualisaddedtothedisplayedpowermeasurement.

Caution: Do not drive the meter beyond full scale, and do not apply more than 500 watts input power at any time.

Figure 6-2: Calibration / Adjustment Equipment Setup

VariableRF Power

Source

LowPassFilter

Model 44AUnder

Calibration

In-LineCalibratedAttenuator

PowerSensor► ► ►►

Page 16


6a DisabletheRFsourceoutput6b SetthewattmeterModeSwitchtoREVposition.6c ReversethewattmeterRFconnectionsintheRFline.6d RepeatSteps1cthrough5cforthe5,15,50,150and500watt

ranges,usingadjustmentpointsR2,R6,R10,R14,andR18.6e Reinstalltherearpanelandbumperscrews.

6.08 Reverse Mode Adjustment

2a SetthewattmeterRFRangeSwitchtothe15wattscale.2b SettheRFsourcetoproduce11wattsoutput.2c AdjustR3untiltheTelewavewattmeterreads11watts.




Step Procedure1a SettheRFsourceto467MHz.1b SetthewattmeterModeSwitchtoFWDposition.1c SetthewattmeterRFRangeSwitchtothe5wattrange.1d SettheRFsourceto4wattsoutput.1e AdjustR1untiltheTelewavewattmeterreads4watts.

6.06 Removethefourbumperscrewsfromtherearpanel.Remove therearpanel.Figure6-1illustratestheadjustmentlocations.

RefertoFigure6-2,EquipmentSetup.Performthecalibration/adjustmentforForwardandReversedirectionasfollows:

6.07 Forward Mode Adjustment


Page 17

Figure 7-1: VSWR Chart

FORWARD POWER - WATTS (PFWD)

REFLECTED

POWERWATTS

(PREV)

10.00

5.00

4.00

3.00

2.50

2.00

1.75

1.60

1.50

1.40

1.30

1.25

1.20

1.15

1.12

1.10

100

50

20

10

5

2

1

0.5

0.2

0.1500200100502010521

VSWRCHART

8

7 REFERENCE

7.01 Part7containsadditionaldatafortheModel44A/APRFWatt-meterwhichishelpfulinmakinglowfrequencyandVSWRmea-surements.

7.02 Figure 7-1 (below) shows a nomograph for estimatingVSWRfromthemeasuredincidentandreflectedpower.See5.05forcal-culationprocedures.

7.03 Figure 7-2 (pg. 18) shows thewattmeter correction factor forpowermeasurementsbelow150MHz.Forexample:

Frequency=43MHz IndicatedPower=275Watts CorrectionFactorfor43MHz=+12% 275x1.12=308Watts(+/-6%ofFSI)

Page 18


Figure 7-2: Model 44A/AP RF Wattmeter CorrectionFactor for Frequencies below 150 MHz

FREQ

UEN

CY (M

Hz)

CORRECTION FACTOR (%)

25150

125100

7550

0 +5

+10

+15

+20

+25

+30

+35

+40


Page 19

7.04 Figure7-3showsachartforajumpercabletobeusedinlinewiththeModel44A/APWattmetertominimizepotentialmeasurementerrorsinsystemswithhighVSWR.Thechartshowslengthsfora50-ohm,RG-213jumpercable,includingNconnectors,usingavelocityfactorof0.66forthecableandconnectors.Thejumpercable andwattmetertogethershouldequalascloseto1/2wave-lengthequivalentaspossible,atthetestfrequency.

Figure 7-3: RG-213 Jumper Cable with N-Male Connectors

MHZ INCHES 25 = 153.23 30 = 127.25 35 = 108.69 40 = 94.78 45 = 83.95 50 = 75.29 55 = 68.21 60 = 62.30 65 = 57.31 70 = 53.03 75 = 49.32 80 = 46.07 85 = 43.20 90 = 40.66 95 = 38.38100 = 36.33105 = 34.47110 = 32.78115 = 31.24120 = 29.83125 = 28.53130 = 27.33135 = 26.22140 = 25.19145 = 24.23150 = 23.34155 = 22.50160 = 21.71165 = 20.98170 = 20.28175 = 19.63180 = 19.01

MHZ INCHES185 = 18.42190 = 17.87195 = 17.34200 = 16.84205 = 16.37210 = 15.92215 = 15.48220 = 15.07225 = 14.68230 = 14.30235 = 13.94240 = 13.60245 = 13.26250 = 12.95255 = 12.64260 = 12.35265 = 12.06270 = 11.79275 = 11.53280 = 11.28285 = 11.03290 = 10.80295 = 10.57300 = 10.35305 = 10.14310 = 9.93315 = 9.73320 = 9.54325 = 9.35330 = 9.17335 = 8.99340 = 8.82

MHZ INCHES 345 = 8.65350 = 8.49355 = 8.34360 = 8.18365 = 8.04370 = 7.89375 = 7.75380 = 7.61385 = 7.48390 = 7.35395 = 7.22400 = 7.10405 = 6.98410 = 6.86415 = 6.75420 = 6.64425 = 6.53430 = 6.42435 = 6.32440 = 6.22445 = 6.12450 = 6.02455 = 5.92460 = 5.83465 = 5.74470 = 5.65475 = 5.56480 = 5.48485 = 5.39490 = 5.31495 = 5.23500 = 5.15

TELEWAVE, INC.660 Giguere Court

San Jose, CA 95133 USA1-800-331-3396+1 408-929-4400

PRODUCT WARRANTYProducts sold by Telewave, Inc. and covered by this Warranty are warranted to be free from defects in material and work man ship at the time of and for a period of one (1) year after delivery to the Buyer. Seller’s entire warranty obligation is limited to making adjustments by repair, replacement, or refunding the purchase price of any product which is returned to the Seller as provided below within one (1) year from the date of shipment by the Seller. In no event shall Seller be liable for direct, special, or consequential damages for breach of warranty.

Adjustment will not be allowed for products which have been damaged by lightning, subjected to abuse, im prop er application or installation, alteration or accident, or negligence in use, storage, trans por ta tion or han dling. Alteration or removal of the serial number or identifi cation markings voids the Warranty. Seller shall have the right of fi nal determination as to the existence and cause of a defect, whether adjustment will be allowed, and if allowed, whether adjustment will be by repair, replacement, or refund. Where adjustment is not allowed, a charge of 5% of the original purchase price will be made to the Buyer to cover the Seller’s cost of in-spection and handling.

Shipping and packaging instructions must be obtained from the Seller before prod-ucts are returned for ad just ment. The Buyer will pay for packing, transportation, and transit insurance costs for returned products. The Seller reserves the right to dis con tin ue models at any time or change spec i fi ca tions, design, or price without notice and without incurring any obligation. Products will be returned to the Buyer with trans por ta tion cost collect.

Subject to the provisions of its “Patent Indemnity” clause, the Seller also warrants that it has the right to sell its products, that the Buyer shall have and enjoy quite possession thereof as against any lawful claims existing at the time of the sale by the Seller, and that said products are free from any charge of encumbrance in favor of third persons existing at the time of sale by the Seller.

The foregoing constitutes the Seller’s entire warranty, express, implied or statutory with respect to its products and states the full extent of its liability for breach of War-ranty and for damages, whether direct, special or consequential resulting form any such breach. No change what so ev er thereto shall be binding upon the seller unless made in writing and signed by a duly authorized representative of the Seller.

Documents

Telewave Wattmeter Model 44A/APTelewave, Inc. Model 44A/AP Page 5 3 PHYSICAL DESCRIPTION 3.01 The controls and indicators of the Model 44A/AP Broadband RF Wattmeter are illustrated