Extech Instruments EX650 - Lo Z AC Voltage Measurements

EX65x‐en‐GB_V1.67/16
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‘LoZ’ACVoltageMeasurements
Thenormalhighinputimpedance(voltagemeasurement position)wouldtypicallybeused
forallACvoltagetests.However,ifavoltageonanon‐energizedlineisdetectedusetheLoZ
settingtodetermineifthevoltageisreallythereorisitaghostvoltage.
WhenthefunctionswitchisturnedtotheLoZ 
positionalowimpedance(Z)testcircuitis
engagedthateliminatesghostvoltagesonnon‐energizedlines.RefertotheVoltage
MeasurementssectionearlierinthisguideforSafetyinformationandconnectiondiagrams.
*TheLoZimpedanceisapprox.3kΩ.
1. Inserttheblacktestleadbananapluginto
thenegative(COM)jackandtheredtestlead
bananaplugintothepositive(V/Ω)jack.
2. MovetheFunctionSwitchtotheLoZposition.
3. TouchthetestprobetipstotheACcircuitundertest.Besuretoobservethecorrect
polarity(redleadtopositive,black
leadtonegative).
4. Readthedigitalvalueandthe60‐segmentbargraphrepresentationofthemeasurement
(EX655)inthedisplay.Thedisplaywillalsoindicatetheproperdecimalpointand
measurementtype/unitssymbols.
5. ThemeteriscapableofdetectingACvoltagesto600VinLoZmode.Note
thevoltage
alertsymbolwhenvoltageispresent.