AEMC 6471 - Environmental; Safety

22 Ground Resistance Tester Model 6471
Measurement of auxiliary electrodes R
ρ
-H
, R
ρ
-S
, R
ρ
-ES
, R
ρ
-E
Measurement
Range
0.14 to
9.99Ω
10.0 to
99.9Ω
100 to
999Ω
1.00 to
9.99kΩ
10.0 to
99.9kΩ
Resolution 0.1Ω 0.1Ω 1Ω 10Ω 100Ω
Operating error ± (10% + 2cts)
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
peak
Max. value for R
H
, R
S
:100kΩ
Measuringtime:approx. 7 s for the rst value of R
Loop
, then 3 meas. per s.
Measurement Range 0.10 to 9.99Ω 10.0 to 99.9Ω 100 to 500Ω
Measurement frequency 1367Hz - 1611Hz - 1758Hz
Resolution 0.01Ω 0.1Ω 1Ω
Operating error
(1)
(without external current)
SR182
± (10% + 1cts)
MN82 ± (20% + 2cts)
Measurement Range 0.10 to 9.99Ω 10 to 30Ω
Measurement frequency 128Hz
Resolution 0.01Ω 0.1Ω
Operating error
(1)
(without external current)
SR182
± (20% + 2cts)
MN82 not specified
(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
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