Digital Ground Resistance Tester Model 3640 and 4610
1
Table of Contents
1. INTRODUCTION ............................................................................... 3
1.1 International Electrical Symbols ................................................3
1.2 DenitionofMeasurementCategories .....................................4
1.3 ReceivingYourShipment ..........................................................4
1.4 OrderingInformation .................................................................4
1.4.1 Kits,AccessoriesandReplacementParts ....................5
2. PRODUCT FEATURES ...................................................................... 6
2.1 3640ControlandConnectorIdentication ...............................6
2.2 4610ControlandConnectorIdentication ...............................7
2.3 FaultIndicatorLEDs .................................................................8
2.3.1 X-ZFault .......................................................................8
2.3.2
X-YHighResistance(3640)
Xv-YHighResistance(4610) ............................................... 8
2.3.3 X-YHighNoise(3640)
Xv-YHighNoise(4610) ...................................................8
2.4 Over-rangeIndication ...............................................................9
2.5 FaultLEDIndication–TipsandSolutions ................................9
3. SPECIFICATIONS........................................................................... 10
3.1 Electrical .................................................................................10
3.2 Mechanical ..............................................................................11
3.3 Environmental .........................................................................11
3.4 SafetySpecications ..............................................................11
3.5 Auto-ranging ...........................................................................12
4. OPERATION .................................................................................. 13
4.1 GroundingElectrodeResistance ............................................13
4.1.1 EffectofGroundElectrodeSizeandDepth
on Resistance .............................................................15
4.1.2 EffectsofSoilResistivityonGroundElectrode
Resistance ..................................................................16
4.1.3 FactorsAffectingSoilResistivity .................................17
4.1.4 EffectofGroundRodDepthonResistance ................19
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