Ground Resistance Tester Model 6471
3
5. AUTOMATIC MODE ........................................................................ 27
5.1 Switching the Test Voltage .................................................................27
5.2 Resistance Measurement m
Ω
(2-Wire)
..............................................27
5.2.1 Lead Compensation Measurement ......................................28
5.2.2 Alarm Function ......................................................................29
5.3 Resistance Measurement mΩ (4-Wire)
..............................................30
5.4 Earth/Ground Measurement (3-Pole)
.................................................31
5.4.1 62% Method ..........................................................................31
5.4.2 Full Method ...........................................................................33
5.4.3 Recommendations for a Reliable Measurement ...................34
5.5 Earth/Ground Measurement (4-Pole)
.................................................35
5.5.1 Measurement without a Clamp .............................................35
5.5.2 Measurements with a Clamp ................................................36
5.6 Soil Resistivity Measurements (
ρ
Position) ........................................38
5.6.1 Advantages/Disadvantages of Wenner & Schlumberger
......38
5.6.2 Changing the Measurement Method.....................................39
5.6.3 Programming the Distance for Electrode Placement ............39
5.6.4 Wenner Method
....................................................................40
5.6.5 Schlumberger Method...........................................................41
5.7 Earth/Ground Measurements with Two Clamps .................................43
6. MANUAL MODE ............................................................................ 45
6.1 Switching the Test Voltage .................................................................45
6.2 Measurement Frequency Selection ...................................................45
6.3 Manual Settings for m
Ω
Measurements ............................................46
6.3.1 Continuity Test ......................................................................46
6.4 3-Pole Earth/Ground Measurements & Coupling
................................ 47
6.4.1 3-Pole Earth/Ground Measurements
....................................47
6.4.2 Earth/Ground Coupling Measurements ................................47
6.5 4-Pole Earth/Ground Measurements
.................................................49
6.6 Soil Resistivity Measurements
...........................................................49
6.7 Measurements with Two Clamps .......................................................49
6.8 Smoothing ..........................................................................................49
7. MEMORY FUNCTION ..................................................................... 50
7.1
Saving Measurements into Memory
...................................................50
7.2 Recalling Measurements from Memory .............................................51
7.3 Erasing Measurements from Memory ................................................51
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