Ac Earth/Ground Resistance Measurements - AEMC 6471 User Manual

4-Pole mΩ measurement
Measurement
Range
Resolution
Intrinsic error
Operating error
3.2.5
Measuring method: Voltage/Current measurement (EN 61557 part 5)
Open circuit voltage: 16 or 32Vrms square wave (if current > 240mA the output
voltage is reduced to 10Vrms)
Test frequency: Selectable from 41 to 513Hz (see table in § 6.2)
Short circuit current: > 200mA
Noise suppression: > 80 dB for frequencies 20% or more above or below the
test frequency
Max. overload: 250Vrms
Max. value for R
Measuring time:
The following error indications refer to reference conditions with a test voltage of
32V, test frequency of 128Hz, R
The operating error of AC resistance measurements can be less than that speci-
fied for voltage or current because frequency characteristics of the voltage channel
are matched to those of the current channel.
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 256Hz, the resistance of the auxiliary earth electrodes is measured at the
test frequency set. At higher frequencies the resistance is measured at 256Hz.
18
Find Quality Products Online at:
0.020 to
9.999Ω
0.001Ω

AC Earth/Ground Resistance Measurements

AC
& R : 100kΩ
H S
Short push on START: approx. 7 s for first value of R
128Hz, then 3 measurements per s.
Long push on START: approx. 15 s for first value of R
128Hz, then 3 measurements per s.
0.14 to
9.99Ω
0.1Ω
GlobalTestSupply
www.
10.00 to 100.0 to
99.99Ω 999.9Ω
0.01Ω 0.1Ω
± (2% + 2cts)
± (5% + 5cts)
and R = 1kΩ, no external voltage.
H S
, R , R , R
H S ES E
10.0 to 100 to
99.9Ω 999Ω
0.1Ω 1Ω
± (10% + 2cts)
Ground Resistance Tester Model 6471
1.000 to 10.00 to
9.999kΩ 99.99kΩ
1Ω 10Ω
at
E
at
E
1.00 to 10.0 to
9.99kΩ 99.9kΩ
10Ω 100Ω
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