AEMC 4500 User Manual

Table of Contents1. INTRODUCTION ....................................................................31.1 International Electrical Symbols .....................................................41.2 Receiving Your Shipment ...............................................................41.3 Ordering Information ......................................................................41.3.1 Accessories and Replacement Parts ................................42. PRODUCT FEATURES............................................................62.1 Description .....................................................................................62.2 Detaching the Cover ......................................................................72.3 Control Features ............................................................................83. SPECIFICATIONS ..................................................................93.1 Electrical Specifications .................................................................93.2 Accuracy ......................................................................................103.3 Table of Influencing Parameters .................................................. 113.4 Influence of Stray Voltage ............................................................123.5 Influence of Auxiliary Resistances ...............................................123.6 Mechanical Specifications............................................................133.7 Safety Specifications....................................................................144. OPERATION .........................................................................154.1 Grounding Electrode Resistance .................................................154.1.1 Effect of Electrode Size/Depth on Resistance .................174.1.2 Effects of Soil Resistivity on Electrode Resistance .........184.1.3 Factors Affecting Soil Resistivity......................................184.1.4 Effect of Ground Electrode Depth on Resistance ............214.2 Ground Resistance Values ..........................................................224.3 Ground Resistance Testing Principle ...........................................244.3.1 Position of Auxiliary Electrodes in Measurements .................254.4 Measuring Resistance of Ground Electrodes ..............................264.4.1 Auxiliary Electrode Spacing .............................................284.5 Ground Resistance Measurement Procedures ............................294.5.1 Over-range Indication ......................................................304.5.2 Incorrect Measurements ..................................................304.6 2-Point Measurement (Simplified Measurement) .....................30