User Manual
MA140‐en‐GB_V1.01/15
2
Introduction
ThankyouforselectingtheExtechMA140300AACTrueRMSMiniClampMeterwithNon ‐Contact
VoltageDetector.TheMA140issmallinsizebutruggedinperformance.
TheMA140measuresACcurrentto300AandoffersaSmartDataHoldfeature,displayBacklight,
In‐rushCurrentmode,LowPass
Filtering(LPF),anda non‐contactVolt‐Detectionfeaturethat
senseselectricalsourcessafely.
Thisdeviceisshippedfullytestedandcalibratedand,withproperuse,willprovideyearsofreliable
service.Pleasevisitourwebsite(www.extech.com)tocheckforthelatestversionofthisUser
Guide,ProductUpdates,ProductRegistration,andCustomerSupport.
SafetyInformation–PleaseReadFirst
Toensurethesafeoperationandserviceofthemeter,followtheseinstructionsclosely.Failureto
observewarningscanresultinsevereinjury.
WARNINGS
WARNINGSidentifyhazardousconditionsandactionsthatcouldcauseBODILYHARMorDEATH.
IndividualprotectiveequipmentshouldbeusedifHAZARDOUSLIVEpartsintheinstallationwhere
measurementsaretobecarriedoutcouldbeaccessible.
Iftheequipmentisusedinamannernotspecifiedbythemanufacturer,theprotectionprovidedbythe
equipmentmaybeimpaired.
Toreducetheriskoffireorelectricshock,donotexposethisproducttorainormoisture.
Verifythemeteroperationbymeasuringaknownvoltage.Ifindoubt,havethemeterserviced.
Donotapplymorethantheratedvoltageasmarkedonthemeter.
Toavoidfalse
readingsthatcanleadtoelectricshockandinjury,replacebatteryassoonasthelow
batteryindicatorappears.
Donotusethemeterinoraroundexplosivegasorvapor.
Pleasekeepfingersandhandsbehindthefingerguards.
Donotexposemetertoextremesintemperature
orhighhumidity.
De‐energizetheinstallationundertestorwearsuitableprotectiveclothingwhenplacingorremoving
thecurrentclampfromatestsetup.
Donotapply/removethecurrentclampto/fromUNINSULATEDHAZARDOUSLIVEconductorswhichmay
causeelectricshock,electricburn,orarcflash.