AEMC 6471 - Earth;Ground Measurement (3-Pole); 62% Method

Ground Resistance Tester Model 6471 31
3. Start the measurement by pressing the START/STOP button.
DC
H
E
±
AUTO
S
ES
Ω
DC
ALARM
Ω
Ω
±
4. To display the measurement parameters, press DISPLAY several times.
The device displays the following parameters:
R+, R-, +U
H-E
, +I
H-E
, -U
H-E
, -I
H-E
, U-Act (U
H-E
and its frequency)
5.4 Earth/Ground Measurement (3-Pole)
This function is used to measure an earth (ground) resistance with 2 auxiliary
electrodes.
There are several measurement methods, the full and simplied (62% method) will
be discussed in this section.
5.4.1 62% Method
1. Set the switch to
Ω
.
2.
Place electrodes H (Z) and S (Y) to form a straight line with the earth electrode
under test.
The distance between electrode S (Y) and the earth electrode is 62% of
the distance between electrode H (Z) and the earth electrode; the distance
between the electrodes H (Z) and E (X) should be 8 to 10 times the depth of
the rod you are testing.
Ω
Ω
H (Z)
S (Y)
distance d - 62% d
distance A > 80 m
In order to avoid electromagnetic interference, it is best to unwind the full length of
each cable from the reel, to keep the cables as far apart as possible on the ground,
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