Table of Contents
Advertisement
3.2.6
Soil Resistivity Measurement
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
AC
, R
, R
, R
: 100kΩ
H
S
ES
E
W
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
10.0 to
9.99Ω
99.9Ω
0.01Ω
0.1Ω
, R
ρ-H
< 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
ρ
= 2p d R
S-ES
= (p (d² - (A/2)²) / A) R
S
100 to
999Ω
1Ω
± (2% + 1ct)
, R
and R
ρ-S
ρ-ES
and:
ρ
-H
, R
, R
ρ
ρ
-E
-ES
Ground Resistance Tester Model 6472
S-ES
1.00 to
9.99kΩ
10Ω
= 1kΩ, no external voltage.
ρ-E
Operating error for R
± (7% + 2cts)
± (15% + 3cts)
± (20% + 1ct)
, R
assumed to be identi-
ρ
ρ
-E
-H
.
rod
at
S-ES
at
S-ES
10.0 to
99.9kΩ
100Ω
S-ES
Advertisement
Table of Contents
