Amprobe GP-2 Geo-Test - Manual (Page 30)

GP-2 GeoTest
EN - 30
Resistivity measurement
ρρ
Range (**) Resolution Accuracy (*)
0.6-125.6
Ω
m 0.1
Ω
m
0.125 – 1.256 k
Ω
m 0.001 k
Ω
m
1.25-19.99 k
Ω
m 0.01 k
Ω
m
20.0 – 199.9 k
Ω
m 0.1 k
Ω
m
±
(2% reading + 3 digits)
(*) If R
P
> 100R
E
and/or R
C
> 100R
E
, R
P
> 50k
Ω
and/or R
C
> 50k
Ω
, if the instrument carries out the test
the accuracy of the instrument is
±
(10%Reading)
R
P
= resistance of the voltage circuit
R
C
= resistance of the current circuit
R
E
= earth resistance
ρ
= 2
π
DR
E
= calculated resistivity
(**) Automatic selection of the range
Measuring frequency 125Hz / 75Hz/ 41.66Hz
Measuring current 10mA
Open-terminal measuring voltage 25Vrms
Waveform of measuring voltage: sine wave
Interfering voltage:
-
amperometric circuit: the measurement is taken with the stated accuracy if the interfering voltage is
≤
3V,
while for interfering voltages between 3 and 30V inclusive, the accuracy decreases progressively; with an
interfering voltage of about 30V the instrument does not perform the test.
- voltmetric circuit: the measurement is taken if the interfering
voltage is
≤
3V; in case of higher voltages the instrument does
not perform the test.
Interfering voltage measurement
Range
(V)
Resolution
(V)
Accuracy
500 1
±
(2% reading + 2 digits)
Safety standards
This instrument complies with EN 61010, EN 61557-1, EN 61557-5 standards.
Insulation class 2, double insulation
Pollution 2
Maximum altitude 2000m
Surge voltage category CAT III 250V (phase to earth)