EXTECH EX381676A [8/13] Ac and dc current measurements

381676A-en-GB_V1.1 08/15

ACandDCCURRENTMEASUREMENTS

WARNING:Riskofelectricshock.Topreventdamagetothemeterorpersonalinjury,never

measurecurrentwhereopencircuitvoltagesexceed250V.

NOTE:‘OL’indicatesanover‐rangeconditioninmanualmode.Ahigherrangeshouldthenbe

selected.

1. UsetheprobecoverifmakingmeasurementsoncategoryIIIoraboveinstallations

2. SetthefunctiondialtothemAposition.

3. UsetheMode(M)buttontoselectACor

.

4. Inserttheblacktestleadbananapluginto

thenegativejackatthebottomofthe

meter.

5. Connectthetestleadsinserieswiththe

circuitundertest.

6. Touchtheblacktestprobetiptothenegativesideofthecircuit.

7. Touchthepositivetestprobe

tiptothepositivesideofthecircuit.

8. Readthecurrentreadingonthedisplay.Themeterautomaticallysele ctstheoptimum

rangeortheusermaymanuallyselectarangebypressingtheRange(R)button.Press

andholdtheRange(R)buttontoreturntotheAUTORange

mode.



DIODETEST

NOTES:Thedisplayshowstheapproximateforwardvoltagedrop.Iftheconnectionsarereversed

ortheleadsarenotconnected,thedisplaywillshow‘OL’.

1. UsetheprobecoverifmakingmeasurementsoncategoryIIIoraboveinstallations

2. Setthefunctionswitchtotheposition.

3. Use

theMode(M)buttontoselectthediode

function 

4. Inserttheblacktestleadbananaplugintothenegative

(common)jackatthebottomofthemeter.

5. Touchthetestprobestothediodeundertest.

6. Agooddiodewillindicateapprox.0.3V(germanium

diodes)to0.7V(silicondiodes)forthe

forwardtestand

“OL”forthereversetest.

7. Ashorteddiodewillindicatethesamevalueofvoltageinboththereverseandforward

testdirections.Anopendiodewillindicate“OL”inbothtest

directions.

