Grounding Resistance Measurement (3P) - AEMC 6422 User Manual

2.3.3 Grounding Resistance Measurement
For the first grounding resistance test, we recommend starting with the 62%
distance.
1. Place the H and S rods in a line with the grounding electrode under test.
The distance between the S rod and the grounding electrode must be
approximately 62% of the distance (d) between the H rod and the
grounding electrode. (To avoid electromagnetic interference, we
recommend using the full length of the cables, placing them several
inches apart and avoiding loops.)
2. Connect the cables to the H and S terminals.
3. Power down the installation and isolate the ground under test from other
ground systems and connections.
4. Connect the E terminal to the grounding electrode to be tested.
5. Press TEST to take a measurement in automatic mode.
The TEST button blinks red, then the measurement is displayed. It
remains frozen (HOLD) until you press TEST again.
(Model 6424) R
Ground Tester Models 6422/6424
and U values are displayed.
H SE
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