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Digital Ground Resistance Tester Model 3640 and 4610

2.3 Fault Indicator LEDs

The three indicators described below conrm the correct measurement

beingtakenifnoneofthemarelit.

2.3.1 X-Z Fault

ThisLEDsignalsthatvoltagebetweenterminalsXandZexceeds30Vpeak.

Therearefourpossiblecauses:

• theresistanceofthecurrentcircuitbetweenXandZistoohigh

• interferencevoltageinthecurrentcircuitistoohigh

• thefuseisblown

• thecircuitisopen(leadnotconnected)

2.3.2

X-Y High Resistance (3640) - Xv-Y High Resistance (4610)

ThisLEDsignalsthattheresistanceinthevoltagecircuit(betweenXvand

YorXandY)istoohigh(approx50kΩ)orthatthecircuitmaybeopen.

• Flashing willcontinue throughout the measurement, evenif the

resistancedropsbelowthethreshold(e.g.afterreconnectingor

loweringauxiliaryrodresistance).

• Inthiscase,you mustreleasethepush-buttonandpressagain

afterthefaulthasbeencorrected.

• Occasionally, a stray voltage above 6VDC may also set off this

light.

• Checktheleadsforapossiblesolution.

2.3.3 X-Y High Noise (3640) - Xv-Y High Noise (4610)

ThisLEDsignalsthepresenceofexcessivenoise(approx13Vpeak)in

thevoltagecircuit(betweenXvandYorXandY).

• Oneremedyistouseshieldedleadsfromtheinstrumenttothe

auxiliaryelectrodes.

• Connectalltheshieldstotherodundertest.

AEMC 3640 User Manual

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