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Digital Ground Resistance Tester Model 3640 and 4610

2.4 Over-range Indication

Over-rangeisindicatedwhenthedisplayreads1,orwhenthedisplayis

blinkingandtheindicatorislit.

2.5 Fault LED Indication – Tips and Solutions

TheLEDindicatorsshowexcessive electrode resistance andexcessive

transientnoiseand/orstraycurrent.

Intheeventofanincorrectmeasurementindication:

• Improvethequalityoftheconnectiontoearthofauxiliaryground

electrodesYandZ.Zisthemostlikelysourceofproblemscaused

byexcessiveelectroderesistance.

• Checkconnectionsforcontinuitybetweenleadsandelectrodes.

• Be sure that electrodes are properly inserted; they should be

buriedasmuchaspossible.

• Ifhighelectroderesistancestillexistsafterproperlyinsertingaux-

iliaryelectrodesintotheearth,trypouringwateronandaround

theauxiliaryelectrodes.Thiswillimprovetheirelectricalconnec-

tiontoearth.

• Ifstraycurrentsaresuspected,onesolutiontoreducetheirinu-

enceistomovebothYandZelectrodesinanarcrelativetotheX

electrode(try,e.g.,a90°shift),andtestagain.

• Displayof0.00:XvandYareshort-circuited.

• Displayof<0:XandZorXvandYrodsarereversed.

NOTE: Accuracy may be affected by auxiliary ground rod (Ry, Rz) resistance

levels and by stray signal levels (earth currents).

AEMC 3640 User Manual

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