Extech Instruments EX655

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EX65x‐en‐GB_V1.67/16

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

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Fig4‐1ACVOLTAGEMEASUREMENTS

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