Extech Instruments MA440 - DC Current Measurement

MA44x‐en‐GB_V1.08/16
9
DCCurrentMeasurements(MA445)
WARNING:Donothandlethemeterabovethefinger/handguardbarrier.
 CAUTION:ObserveCATIII600VwithrespecttoEarthGroundfortheJaw.
CAUTION:Measureinthetemperaturerangeof0~40
o
Conly.
1. RotatethefunctionswitchtotheDCCurrentposition .
2. TheAandtheDCsymbolswillappearonthedisplayindicatingDCAmperes(Amps).The
AUTOiconwillalsodisplayindicatingautomaticranging.
3. ZeroanyresidualmagnetismbypressingandholdingtheRELZERObuttonwithno
conductorinthejaws.SeeFig.3andFig.4

4. Pressthejawtriggertoopentheclampjaw.Positiontheclamparoundonlyone
conductor.SeeFig.2(previoussection)forcorrectandincorrectclampingtechniques.
5. Readthecurrentinthedisplay.Thedisplaywillindicatetheproperdecimalpointand
value.
NOTES:
Toensuremaximumaccuracy,
placetheconductoratthecenteroftheclamphead,otherwise
additionalerror(±1.0%)mayapply.
Ifthereadingsarepositive,thecurrentisflowinginadownwarddirection(faceplatetobackof
meter).
Donotreleasethetriggersuddenly;theimpactmayleadtoachangeinreadingssince
theHall
elementissensitivenotonlytomagnetismbutalsotoheatandmechanicalstresstosome
extent.
A
DC

A
DC

Fig.3–DCAZerobeforemeasurementFig.4–DCAMeasurement