Earth/Ground Measurements With 2 Clamps; Data Storage - AEMC 6471 User Manual

Measurement of auxiliary electrodes R
Measurement
Range
Resolution
Operating error
The START button must be pressed for more than 2 s. For frequencies between
41 and 128Hz, the resistance of the auxiliary earth electrodes is measured at the
test frequency set. At higher frequencies the resistance is measured at 128Hz.
3.2.7

Earth/Ground Measurements with 2 Clamps

Measuring method: Voltage/Current measurement with a rectangular AC signal
Induced short circuit current: < 26Arms (with SR182) < 5Arms (with MN82)
Signal frequency: Automatic: 1611Hz - Manual: 128, 1367, 1611 or 1758Hz
Noise suppression: > 80 dB at frequencies differing by 20% or more from the
test frequency
Max. interfering current: 20A
Max. value for R
H
Measuring time: approx. 7 s for the first value of R
Measurement Range
Measurement frequency
Resolution
Operating error
(1)
(without external current)
Measurement Range
Measurement frequency
Resolution
Operating error
(1)
(without external current)
(1): Observe the minimum distance between the two clamps according to table in § 5.7.

3.3 Data Storage

Memory Capacity: 512 test results (64kB)
Communication: Optically isolated USB
22
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0.14 to 10.0 to
9.99Ω 99.9Ω
0.1Ω 0.1Ω
peak
, R : 100kΩ
S
SR182
MN82
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, R , R
ρ ρ ρ
-H -S -ES
100 to
999Ω
1Ω
± (10% + 2cts)
, then 3 meas. per s.
Loop
0.10 to 9.99Ω 10.0 to 99.9Ω
1367Hz - 1611Hz - 1758Hz
0.01Ω
± (10% + 1cts)
± (20% + 2cts)
0.10 to 9.99Ω
0.01Ω
SR182
MN82
Ground Resistance Tester Model 6471
, R
ρ
-E
1.00 to 10.0 to
9.99kΩ 99.9kΩ
10Ω 100Ω
100 to 500Ω
0.1Ω 1Ω
10 to 30Ω
128Hz
0.1Ω
± (20% + 2cts)
not specified
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