Extech Instruments EX650 - Page 13

EX65x‐en‐GB_V1.67/16
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ACVoltageMeasurements
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. Turnthefunctionswitchtothe
position.UsetheM(MODE)buttontoselectAC.
3. ReadtheWarningandCautionstatementsabovetodeterminewhetherornottousethe
testleadprobecovers.
4. Touchthetestprobetipstothecircuitundertest.
5. Readthedigitalvalueandthe60‐segmentbargraph
(EX655only)onthedisplay.The
meterisAutoRanging(AutodisplayedonLCD)andthereforeselectstheproperdecimal
pointposition.Themeteralsodisplaysthemeasurementtype,unitsymbols,andother
relevantmultifunctionicons.
6. UsetheMbuttontoviewthefrequency(Hz)ofthemeasuredvoltage(EX655only).
Importantnote:Waituntilthemeterissetupandactivelymeasuringthevoltagesignal
beforeaccessingtheHzmeasurementmode.
7. Notethevoltagealertsymbol
whenvoltageispresent.
8. ThemeteriscapableofdetectingACvoltagesto750V.
9. ForEX655only:PressandholdtheLPFbuttontoengagetheLowPassFiltercircuit(the
LPFiconwilldisplay).PressandholdLPFagaintoexitthismode.SeetheLowPassFilter

sectionformoredetails.
10. SetthefunctionswitchtotheLoZpositiontoengagethelowimpedancecircuit(the
impedancewillnowbeapproximately3kΩ).SeethededicatedLoZsectionofthisguide.
AC Hz
EX655

Fig4‐1ACVOLTAGEMEASUREMENTS
