2200811_PM_EN

7/30/2019 2200811_PM_EN

1/4

42-Range Digital Multimeter

Users Guide 22-811

Thank you for purchasing your 42-Range Digital Multimeter from RadioShack. Please read this users guide beforeinstalling, setting up, and using your new multimeter.

2008. RadioShack Corporation. All rights reserved. RadioShack an dRadioShack.com are trademarks used by RadioShack Corporation.

22-811AO0070ACA1

10A08Printed in China

q Use the buttonsSELECT Togglesamong functions.

RANGE Selects manualmode and ranges.

REL Takes relativemeasurements.

HOLD Tests displayand holds a reading.

o Connect the test leads1. Remove the rubber capsfrom the test

leads.

2. Plug the black lead into the COMjack and the red lead into the+V..mA jack.

To measure current greater than 400mA,

plug the red test lead into +10A MAX.

Note: The buzzer sounds after connectingto the+10A MAXjack to measureanything except current. Thisrem indsyo uno tto touch the testlead sto the circuit.

p Set the function switchV Measures AC and DC voltages.

A/A , mA/A Measures AC andDC amperage.

/ Measures resistance andcapacitance.

/ Checks continuity and diodes.

Hz/Duty Measures frequency andduty cycle.

EF r#HECKSELECTRICELDS

OFF Turns off the meter.

n Install the batteryBefore installing battery, make sure the

function switch is set to OFF and testleadsare disconnected.

1. Remove the screwon theback to open the batterycompartment cover.Install one 9Vbattery(notincluded).

2. Replace the coverand secure it withthe screw.

Whats Included

42-Range Digital Multimeter

Test Leads (2)

Spare Fuse (in the case)

Users Guide

WARNINGS: To avoid electric shock,disconnect

bo th testlead sfrom the circuitund ertestbefore you replace the

batteryand fuse. D o notop erate the m eterun til

the batteryisprop erly installedand the back cover and b atterycom partm en tcoverare in placeand secured.

The sup plied testlead sare rated1000V.Use only testleads ofthesam e rating,butdo notuse them eterto m easure voltages greaterthan 600V D C o rAC .

Care and Service Keep your meter dryand clean.

If it gets wet or dirty, wipe it dryor clean immediately with a clothlightlyd ampened with water. Donot use harsh chemicals, cleaningsolvents, or strong detergents toclean the meter.

Use and store the meter in normaltemperature environmentsonly.Handle your meter carefully. D onot drop it.

M odifying or tampering themetersinternal componentscan cause malfunction andmight i nvalidate itswarranty. Ifyour meter isnot performing asit should, take it to your localRadioShack store for assistance.

Battery Notes:

W hen displaysor the m eterstops op erating properly,replacethe battery.

Use only a fresh batteryoftherequired size and type.D ispose

ofold batteries prom ptly andproperly.D o notb urn orb ury them .

Ifyou do notplan to use yourm eterfora m onth orm ore,rem o ve thebattery.Batteries can leak chem icalsthatm ay dam age electronic parts.

Range DisplayRangesare indicated asbelow on thedisplay:

Position Range Display Position Range Display

V

400mV 000.0mV

/

400 000.04V 0.000V 4. 0.000.

40V 00.00V 40. 00.00.

400V 000.0V 400. 000.0.

600V 000V 40 0.0000

A/A

400A 000.0A 400 00.000

4mA 0.000mA 4nF 0.000nF

4A 0.000A 40nF 00.00nF

10A 00.00A 400nF 000.0nF

mA/A

40mA 00.00mA 4F 0.000F

400mA 000.0mA 40F 00.00F

4A 0.000A

10A 00.00A

www.radioshack.com

7/30/2019 2200811_PM_EN

2/4

Using MeasurementSettings

Selecting Ranges

1. Set the function switch to a p osition.

2. PressSELECTto choose a function(such ascontinuity( ) or diode ( )check function under / ). Themeter is in auto mode. The wordAUTO displays, and the meterautomaticallyselectsa range

according to the rating of the circuitunder test.You can pressRANGE to entermanual mode. AUTO disappears.

3. In manual mode, pressRANGE toselect a range. The m easuring unitand decimal point position togetherdenote a range.

Refer to the Range Displaytable onpage 1fo r range indications on thedisplay.

To return to auto mode, pressand holdRANGE for 2 seconds.

Using Zero Offset

Thisappliesto the V , A/ A , mA/A ,/ , and Hz functions.

The m eter showszero offset for someranges, especiallythe 4nF range of the

capacitance ( ) function. You can useREL to remove zero offset.

To take measurements without zerooffset:

1. Remove the test leadsfrom anycircuit for the capacitance function,or touch them together for otherfunctions.

2. When you see a small value (zerooffset), pressREL . The meter isinmanual mode.

3. Take measurementswith RELdisplayed. You get exact measuredvalues.

Using Relative Measurments

You can take measurementsrelativeto a reference value. This applies tothe V , A/ A , mA/A , / , and Hzfunctions. Take resistance measurement

asan example.

1. Set the function switch to / tomeasure a resistor whose value youwant to use asthe reference value.

2. When you see the resistancereading, pressREL .

3. M easure another resistor with RELdisplayed. You get the tolerance ofthis resistor from the reference value.

To exit the relative measurementfunction, press REL again.

Testing the Display

Pressand hold the HOLD buttonwhen you turn on the meter. T hemeter turnson and all segmentsonthe displayappear. R eleaseHOLD toNISHTESTING

Holding a Reading

When you see a reading you want tokeep o n the display, pressHOLD . Thereading staysuntil you pressa buttonor set the function switch to another

position.

Operating the MeterAl waysset the function switch to OFFwhen you are not using the meter. Yourmeter automaticallyturnsoff after 30minuteswhen left unattended.

To deactivate auto power-off, pressand hold both HOLD and SELECT andturn on the meter. PLOCdisplaysuntil yourelease HOLD and SELECT. Then themeter does not turn off automatically.To activate auto power-off, turn off themeter and turn on again.

Accurate reading condition:temperature: 65F to 83F (18C to28C); relative humidity:

7/30/2019 2200811_PM_EN

3/4

Measuring Resistance

1. Set the function switch to / .

2. PressSELECT to choosethe resistance function(, ., or 0 appearsafterreadings).

3. Power off the circuit under test anddischarge all capacitors.

4. Connect the test leads acrossthe circuit. O r remove o ne of thecomponentsleadsfrom itscircuit

and touch the test leads acrossthecomponent.

5. Read the measurement.

Note:The m eterh as an internalresistance of sm allvalue (zero offset).To getaccurate m easurem en ts,you cansim p ly touch the testlead stog ethertom easure the internalresistance ,andthen subtractthe internalresistancefrom a m easurem ent.Also refertoUsing Zero Offset on page 2.

Measuring Capacitance


2. PressSELECT to choosethe capacitance function(nF or F appearsafter readings).


4.Connect the test leadsto thecapacitor, matching the polaritiesof the capacitor; or remove oneof the leads of the capacitor fromitscircuit and touch the test leadsacrossthe capacitor.


Notes:

Electrolytic capacitorshavepolarities.Be sure the testleadsm atch the polarities ofsuchcapacitors.

The voltage sapp lied acrosselectrolytic cap acitors affectthe m easured values.Thatis,am easurem e nttaken w ith a lowvoltage islow erthan thattakenwith a voltage thatapp roache sthecapacitorsvoltage rating.Thism etercanno tuse high vo ltage to settheelectrolyte;itcannotm e asure the

absolute capacitance value.

M easurem entso flow -valuecapacitorsm ightm atch orb e closeto the actualinputcapacitanceofthe m eter.To m easure suchcap acitors,use the relativem easurem ent function (see UsingRelative Measurments on p age 2).

T he accuracyo fcapacitancem easurem entde pend so n them easurem ent m ethod and type ofacapacitor.The m etergivesreferencem easurem en tsonly.

Checking Continuity

You can check for op en or shortedelectriccircuits.


2. Repeatedly pressSELECTto choosethe continuityfunction ( appears).


4. Connect the test leads acrossthecircuit.

Shrt

appearsand the buzzersoundsi f the circuit resistance islessthan 50, meaning the circuitis continuousor shorted.

opEn appearsif the circuitresistance is greater than 50,meaning the circuit isnotcontinuous.

Checking Diodes

You can check diodes, transistors, andother semiconductorsfor opens, shorts,and normal operation, and determinethe forward voltage and polarity fordiodes. You can also check LEDs.


2. PressSELECTto choose the diodefunction ( appears).


4. Connect the test leadsacrossthe device, or remove one of thecomponentsleadsfrom itscircuitand touch the test leads acrossTHECOMPONENT/BSERVETHERSTreading.

5. Reverse the test leads and observethe second reading.

If one reading showsa value andthe other showsO.F, then thedevice isgoo d. As the meter showsa value reading, the anode (+)side iswhere the red test lead isconnected.

IfO.Fdisplaysfor both readings,then the device isopen.

I f both readings showsmall valuesor zero, then the device is shorted.

Notes:

The values thatdisplayd uring the

diode check show the actualforw ardvoltage (M ax.2.0V).Ifthe voltageexceed s2.0V,then O.Fapp ears,m eaning this m etercanno tcheckthe diode.

W he n you check a silicon -typesem iconductor,the values m ightvaryaccording to the tem perature.

Measuring Frequency/Duty Cycle

You can measure frequencies from 10Hzto 4M Hz and a dutycycle with signalfrequencies from 10Hz to 100KHz. Theamplitude of a signal is under the peakvalue of 10V.

1. Set the function switch to Hz/Duty.

2. PressSELECTto choose thefrequencyfunction (Hz, KHz, or MHzdisplays) or the dutycycle functio n(% displays).

3. Connect the black test lead to aground reference for the signal,and the red test lead to the signalsource.


Measuring an Electric Field

You can detect the presence of A Cvoltage near AC power cords, wallswitches, or cabling behind a wall. Thisletsyou easilydetect a break in anelectriccircuit or locate the source of anELECTRICELD

1. Set the function switch to EF.

2. Remove the test leadsfrom themeter.

3. Hold the meter and point itstop(where the built-in antenna is) tothe object under test. For bestsensitivity, hold the meter behindthe function switch.

)FTHEMETERDETECTSANELECTRICELD1 to 5barsdi splay(corresponding toSTRENGTHOFTHEELDANDTHEBUZZERsounds.

Replacing the FuseIf the meter stopsworking, you mightneed to replace the fuse. Use the sparefuse or a 500mA, 250V, 5 20mm f ast-acting ceramic fuse.

To replace the fuse:

WARNING: B efore rep lacing the

fuse,m ake sure bo th testleads are

disconn ected from the circuitun de rtest.

1. Set the function switch to OFF anddisconnect the test leads.

2. Remove the top and bottom screwson the back to open the case.

3. Remove the b lown fuse and wrapthe red ribbon around the new fuse.Replace the fuse.

4. Replace the back cover and secure itwith the screws.

Page 3

Fuse Installed Spare Fuse

7/30/2019 2200811_PM_EN

4/4

Safety Precautions Do not use the meter if you are unfamiliar

with electriccircuitsand testing

procedures.

This meter isfor measuring household AC

voltages. Do N O T try to measure 3-phase,

line-to-line voltages. Use extreme caution

when measuring current and voltage

in comm ercial electrical panels; always

wear protective leather gloves, a face

SHIELDANDREPROOFARMANDUPPERBODYprotection.

p 4OREDUCETHERISKOFREORSHOCKHAZARD

do not expose the meter to rain ormoisture. It is for indoor use only.

Use extreme caution when working with

voltagesabove 30V. A lwayspower off the

circuit under test before you connect the

test leadsto high-voltage points.

Neverapplyvoltagesto themeterthat

EXCEEDTHELIMITSGIVENINTHESPECICATIONSNeverapplymore than600V DC and AC

betweenthe inputjacksand ground.

Never tryto probe with both test leadsat

the same time or hold both test leadsin

one hand.

Alwaysdischarge anycapacitorsof the

circuit under test before you attach the test

leads.

Because manyAC/D C setshave a

potentiallyhot chassis, be sure the top o f

YOURWORKBENCHANDTHEOORUNDERNEATHit are m ade of non-conductive materials.

Use the meterasinstructed here, orthe

protection it providesmay be impaired. To

avoid damage, have the meterrepaired by

QUALIEDSERVICEPERSONNELONLY

Special Panel Markings

500VMAX

To avoid electric shock anddamage to the meter, do notconnect the common inputterminal (theCOM jack) to anysource that exceeds 500V withrespect to ground.

600V400mAMAX

The maximum input limitfor voltage measurementis 600V AC or DC, and themaximum input limit for currentmeasurement is 400mA DC orAC at the +V..mA jack.

Caution: RISK OF ELECTRICSHOCK! Refer to the completeoperating instructions.

Caution: Be extremely carefulwhen taking high-voltagemeasurements. DO NOTTOUCH TERMINALS OR TESTLEAD ENDS.

CAT IIThis equipment is rated forinstallation category II (3600 VAmax.).

+10A MAXUNFUSED

The maximum input limit forcurrent measurement using thisjack is 10A DC or AC. This jack isnot fuse-protected.

The meter is protected bydouble insulation.

Note:The UL mark does not indicatethat this product has been evaluated byUnderwriters Laboratories for the accuracyof its readings.

SpecificationsPower Supply................One 9V battery (not included)

Low Battery Indication.................................6.3V 0.3V

Maximum Common Mode Voltage......................................................................................500V DC or RMS AC

Input Impedance.............................. 10M (DCV/ACV)

Diode Check...............Open circuit voltage: 50 30

Open circuit voltage:

Documents

2200811_PM_EN