User manual

381676A-en-US_V1.1 08/15
2
Introduction
ThankyouforselectingtheExtechModel381676A.ThisinstrumentmeasuresAC/DCVoltage
andCurrent,Resistance,Diode,Continuity,Logic,andincludesanon‐contactVoltageDetector
(NCV).FeaturesincludeMAXHold,DataHold,AutomaticPowerOFF(APO),andAuto/Manual
Range.Thisdeviceisshippedfullytestedandcalibratedand,withproper
use,willprovideyears
ofreliableservice.PleasevisittheExtechInstrumentswebsite(www.extech.com)tocheckfor
thelatestversionofthisUserGuide.

Safety
WARNING:Improperuseofthisdevicecanresultinelectricshockordamagetothe
meter.Followallsafetyguidelinespresentedinthismanualandtheusualsafety
precautionsusedwhenworkingwithelectricalcircuits.

ThisinstrumentconformstoGB/T13978‐92fordigitalMultimetertechnicalstandards,aswell
as
GB4793.1‐1995(IEC‐61010‐1:2001)safetystandardsforelectronicmeasuringinstruments
withasafetycategoryofCATIII600Vandpollutiondegree2.

PreliminarySafety
Whenusingthemeter,observeallnormalsafetyrulesconcerning:
 Protectionagainstthedangersofelectricalcurrent
 Protectionofthemeteragainstmisuse

Whenthemeterisdelivered,checkfortransitdamage.Whencheckingvoltage,alwaystestthe
meteronaknownlivecircuitfirst.Testleadsmustbeingoodcondition.Beforeuse,verifythat
thetestleadinsulationisintactandfreefromleadwireexposureorotherdamage.Useonly
the
suppliedtestleads.
Safetyduringuse
 Besuretosettheappropriatefunctionandrangebeforeuse
 Neverexceedthelimitsindicatedinthespecificationtableofthismanual.
 Nevertouchprobes,testleads,oralligatorclipwhenconnectedtolivecircuit.
 Donotmeasurevoltageonterminalsthatexceed600Vaboveearth
ground.
 Alwaysusecautionwhenworkingwithvoltagesabove60VDCor30VACrms.Keepfingersbehindprobe
barrierwhentakingmeasurements.
 Neverconnecttestleadsacrossavoltagesourcewhiletherotaryswitchisintheresistance,continuity,or
diodemodeofoperation.
 Neverperformresistance,continuity,or
diodetestsonlivecircuits.
 Whentakingnon‐contactvoltagemeasurementsensurethatthepositivetestleadisNOTexposedand
thatthenegative(common)testleadisnotconnectedtothebottomofthemeter.
 Beforechangingfunctionsusingtherotaryfunctiondial,besuretodisconnectthe
meter’stestleads
fromanycircuitundertest.
 Neverusethemeterinanexplosiveenvironmentorwheredust,dirt,orsteamexists.
 Neverusethemeterifthehousingorbatterycompartmentisopen.
 Donotstoremeterindirectsunlight,hightemperature/humidity,orcondensation.

Iftheequipmentisusedinamannernotspecifiedbythemanufacturer,theprotectionprovidedbythe
equipmentmaybeimpaired.
 ALWAYSdischargefiltercapacitorsinpowersuppliesanddisconnectthepowerwhenmakingresistance
ordiodetests.