AEMC 6471 - Soil Resistivity Measurement p

Ground Resistance Tester Model 6471 19
4-Pole mΩ measurement
Measurement
Range
0.020 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% + 2cts)
Operating error ± (5% + 5cts)
3.2.5 AC Earth/Ground Resistance Measurements
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: > 200mAAC
Noisesuppression:> 80 dB for frequencies 20% or more above or below the
test frequency
Max.overload:250Vrms
Max. value for R
H
& R
S
:100kΩ
Measuringtime: ShortpushonSTART:approx. 7 s for rst value of R
E
at
128Hz, then 3 measurements per s.
LongpushonSTART: approx. 15 s for rst value of R
E
at
128Hz, then 3 measurements per s.
The following error indications refer to reference conditions with a test voltage of
32V, test frequency of 128Hz, R
H
and R
S
= 1kΩ, no external voltage.
The operating error of AC resistance measurements can be less than that speci-
ed for voltage or current because frequency characteristics of the voltage channel
are matched to those of the current channel.
Measurement of auxiliary electrodes R
H
, R
S
, R
ES
, R
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 256Hz, the resistance of the auxiliary earth electrodes is measured at the
test frequency set. At higher frequencies the resistance is measured at 256Hz.
www.ShopAEMC.com
Shop for AEMC products online at:
1.888.610.7664