AEMC 3640 User Manual

Digital Ground Resistance Tester Model 3640 and 4610 1Table of Contents1. INTRODUCTION ............................................................................... 31.1 International Electrical Symbols................................................31.2 Definition of Measurement Categories .....................................41.3 Receiving Your Shipment..........................................................41.4 Ordering Information .................................................................41.4.1 Kits, Accessories and Replacement Parts ....................52. PRODUCT FEATURES ...................................................................... 62.1 3640 Control and Connector Identification ...............................62.2 4610 Control and Connector Identification ...............................72.3 Fault Indicator LEDs .................................................................82.3.1 X-Z Fault .......................................................................82.3.2 X-Y High Resistance (3640)Xv-Y High Resistance (4610) ............................................... 82.3.3 X-Y High Noise (3640)Xv-Y High Noise (4610) ...................................................82.4 Over-range Indication ...............................................................92.5 Fault LED Indication – Tips and Solutions ................................93. SPECIFICATIONS........................................................................... 103.1 Electrical .................................................................................103.2 Mechanical.............................................................................. 113.3 Environmental ......................................................................... 113.4 Safety Specifications .............................................................. 113.5 Auto-ranging ...........................................................................124. OPERATION .................................................................................. 134.1 Grounding Electrode Resistance ............................................134.1.1 Effect of Ground Electrode Size and Depthon Resistance .............................................................154.1.2 Effects of Soil Resistivity on Ground ElectrodeResistance ..................................................................164.1.3 Factors Affecting Soil Resistivity .................................174.1.4 Effect of Ground Rod Depth on Resistance ................19