8 Fluke Corporation 1623 and 1625 GEO Earth Ground Testers
Automatic switchover of measuring resolution in
dependence to auxiliary earth electrode resistance R
H
RH with U
meas
= 48 V RH with U
meas
= 20 V Resolution
< 300 7 < 250 7 1m7
< 6 k7 < 2.5 k7 10 m7
< 60 k7 < 25 k7 100 m7
< 600 k7 < 250 k7 1 7
Selective measurement of the earthing
resistance (R
E
)
Measuring method Current and voltage measurement with
probe as per EN61557-5 and current
measurement in the individual branch
with additional current transformer
(patent applied for).
Open circuit voltage 20/48 V ac
Short circuit current 250 mA ac
Measuring frequency 94, 105, 111, 128 Hz selected manually
or automatically (AFC), 55 Hz (R*)
Noise rejection 120 dB (16
2
/3, 50, 60, 400 Hz)
Max. overload Max. U
rms
= 250 V (measurement will
not be started)
Measuring Range Display range Resolution Intrinsic error* Operating error*
0.020 7 to 30 k7 0.001 to 2.999 7 0.001 7 ± (7 % of rdg + 2 digit) ± (10 % of rdg + 5 digit)
3.00 to 29.99
7 0.01 7
30.0 to 299.9 7 0.1 7
0.300 to 2.999 k7 1 7
3.00 to 29.99 k7 10 7
* With recommended current clamps/transformers.
Additonal error because of probe- and auxiliary earth
typ. electrode resistance
Measuring error of R
H
and R
S
Typ. of 10 % of R
ETOTAL
+ R
S
+ R
H
Measuring time Typ. 8 sec. with a fixed frequency 30 sec. max. with AFC and complete cycle of
all measuring frequencies
Minimal current in single branch to be measured 0.5 mA With transformer (1000:1)
0.1 mA With transformer (200:1)
Max. interference current through transformer 3 A With a transformer (1000:1)
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