Soil Resistivity Measurement Ρ - AEMC 6471 User Manual

3.2.6
Measuring method: Voltage/Current measurement (EN 61557 part 5)
Open circuit voltage: 16 or 32Vrms square wave
Test frequency: Selectable from 41 to 128Hz (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
Calculation formula, Wenner: ρ
Calculation formula, Schlumberger: ρ
Maximum value of
Measuring time:
Measurement
Range
Resolution
Intrinsic error
The intrinsic error specified refers to reference conditions with a test voltage of
32V, test frequency of 128Hz, R
Operating conditions : R
R is the resistance of the earth rods R
rod
cal.
Note: With a test voltage U
20
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Soil Resistivity Measurement
AC
, R , R , R : 100kΩ
H S ES E
ρ
: 999kΩm (display in kΩft is not possible)
Short push on START: approx. 8 s for first value of R
128 Hz, then 3 measurements per s.
Long push on START: approx. 20 s for first value of R
128 Hz, then 3 measurements per s.
0.00 to
9.99Ω
0.01Ω
< 3 x R
S-ES
≤ 100kΩ
R
electrode
≤ 2000
R / R
electrode S-ES
≤ 50kΩ
R
electrode
≤ 10,000
R / R
electrode S-ES
≤ 10kΩ
R
electrode
≤ 20,000
R / R
electrode S-ES
of 16V, halve the value of R
OUT
GlobalTestSupply
www.
ρ
= 2p d R
W S-ES
= (p (d² - (A/2)²) / A) R
S
10.0 to 100 to
99.9Ω 999Ω
0.1Ω 1Ω
± (2% + 1ct)
, R , R and R = 1kΩ, no external voltage.
ρ-H ρ-S ρ-ES ρ-E
and: Operating error for R
ρ
-H
, R , R , R
ρ ρ ρ
-E -ES -E
Ground Resistance Tester Model 6471
S-ES
S-ES
S-ES
1.00 to 9.99kΩ 10.0 to 99.9kΩ
10Ω 100Ω
S-ES
± (7% + 2cts)
± (15% + 3cts)
± (20% + 1ct)
assumed to be identi-
ρ
-H
.
rod
.com
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at