User's Manual

Extech Instruments
17 GX900-GX930-EN V1.1 5/14

ACVOLTAGEMEASUREMENTS
WARNING:RiskofElectrocution. Theprobetipsmaynotbelongenoughtocontactthelivepartsinside
some240Voutletsfor appliancesbecausethecontactsarerecessed deepinthe outlets.As a result,the
readingmayshow0voltswhentheoutletactuallyhasvoltageonit.Makesuretheprobetipsaretouching
themetalcontactsinsidetheoutletbeforeassuming that novoltageispresent.
CAUTION:DonotmeasureACvoltagesifamotoronthecircuitisbeingswitchedONorOFF.Largevoltage
surgesmayoccurthatcandamagethemeter.
1. SetthefunctionswitchtotheV~position.
2. InserttheblacktestleadbananaplugintothenegativeCOM
jack.InsertredtestleadbananaplugintothepositiveVjack.
3. Touchtheblacktestprobetiptotheneutralsideofthecircuit.
Touchtheredtest
probetiptothe“hot”sideofthecircuit.
4. Readthevoltageinthedisplay.
dBm/dBVACMEASUREMENTS
ThemeteriscapableofdisplayingACvoltageasadBvalue;relative
to1milli‐watt(dBm),relativeto1V(dBV),ortoacustomreference
value.
1. SetthefunctionswitchtotheV~position
2. PresstheF1key(MENU)ontheLCDandthen
navigatetothe
dBm/dBVfieldusingthearrowkeys
andthenpressOK.
3. NavigatetothemenuitemlabeleddBmandthen
pressOK.
4. Inserttheblacktestleadbananaplugintothe
negativeCOMjack.InsertredtestleadbananaplugintothepositiveVjack.
5. Touchtheblack
testprobetiptotheneutralsideofthecircuit.Touchtheredtest
probetiptothe“hot”sideofthecircuit.
6. ReadthedBmintheprimarydisplayareaandreadtheVoltageinthesecondary
displayarea.