AEMC 6471 - Earth;Ground Measurements with 2 Clamps; Data Storage

20 Ground Resistance Tester Model 6471
3-Pole earth resistance measurement R
E
Measurement
Range
0.09 to
9.99Ω
10.0 to
99.9Ω
100 to
999Ω
1.00 to
9.99kΩ
10.0 to
99.9kΩ
Resolution 0.01Ω 0.1Ω 1Ω 10Ω 100Ω
Intrinsic error ± (2% + 1ct)
Operating conditions: R
E
< 3 x R
H
, U
OUT
= 32V
Operating error for R
E
Values for R
H
, R
S
and R
E
Frequency (Hz)
(R
H
+ R
S
) / R
E
< 3000
R
H
≥ 0Ω, Rs ≤ 3kΩ 41 to 513 ± (3% + 2cts)
R
H
> 3kΩ, Rs ≤ 30kΩ 41 to 513 ± (10% + 2cts)
(R
H
+ R
S
) / R
E
< 5000
R
H
> 30kΩ, Rs < 100kΩ 41 to 128 ± (10% + 3cts)
Note: For a test voltage U
OUT
of 16V, halve the value for R
H
.
4-Pole earth resistance measurement R
E
Measurement
Range
0.01 to
9,999Ω
10.00 to
99.99Ω
100.0 to
999.9Ω
1.000 to
9.999kΩ
10.00 to
99.99kΩ
Resolution 0.001Ω 0.01Ω 0.1Ω 1Ω 10Ω
Intrinsic error ± (2% + 1ct)
Operating conditions: R
E
< 3 x R
H
, U
OUT
= 32V
Operating error for R
E
Values for R
H
, R
S
and R
E
Frequency (Hz)
(R
H
+ R
S
) / R
E
< 3000
R
H
≥ 0Ω, Rs ≤ 3kΩ 41 to 513 ± (3% + 2cts)
R
H
> 3kΩ, Rs ≤ 30kΩ 41 to 513 ± (10% + 2cts)
(R
H
+ R
S
) / R
E
< 5000
R
H
> 30kΩ, Rs < 100kΩ 41 to 128 ± (10% + 3cts)
Note:With a test voltage U
OUT
of 16V, halve the value of R
H
.
Selective 4-Pole earth resistance measurement with SR182 or MN82 clamp
Same characteristics as 4-Pole earth measurements with the following particular
conditions:
Minimum current: SR182, I
ES
>0.5mA
MN82, I
ES
>2mA
Maximum R
SEL
/R
E
ratio: SR182, (R
SEL
/R
E
) <500
MN82, (R
SEL
/R
E
) <120
with R
H
+ R
E
<20Ω
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