Datasheet

7 Fluke Corporation 1623-2 and 1625-2 GEO Earth Ground Testers
Measuring
Range Display Range Resolution Accuracy Operating Error
0.020 Ω to 0.001 Ω to 2.999 Ω 0.001 Ω ± ( 2 % of rdg + 2 digit ) ± ( 5 % of rdg + 5 digit )
300 kΩ 3.00 Ω to 29.99 Ω 0.01 Ω
30.0 Ω to 299.9 Ω 0.1 Ω
0.300 kΩ to 2.999 kΩ 1 Ω
3.00 kΩ to 29.99 kΩ 10 Ω
30.0 kΩ to 299.9 kΩ 100 Ω
Measuring time typ. 8 sec. with a fixed frequency
30 sec. max. with AFC and complete cycle of all measuring frequencies
Additional error because of probe-and auxiliary earth
electrode resistance
Measuring error of RH and RS typ. 10 % of R
E
+ R
S
+ R
H
Max. probe resistance ≤ 1 MΩ
Max. auxiliary earth electrode resistance ≤ 1 MΩ
Automatic check if error is kept within the limits required by IEC61557-5.
If after a measurement of probe-, auxiliary earth electrode- and earthing resistance, a measurement error of higher than 30 % is assumed because of the influencing
conditions (see diagram), the display shows a warning symbol
!
and a notice that R
S
or R
H
are too high.
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 Ω < 250 Ω 1 mΩ
< 6 kΩ < 2.5 kΩ 10 mΩ
< 60 kΩ < 25 kΩ 100 mΩ
< 600 kΩ < 250 kΩ 1 Ω
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 Ω to 30 kΩ 0.001 to 2.999 Ω 0.001 Ω ± (7 % of rdg + 2 digit) ± (10 % of rdg + 5
digit)
3.00 to 29.99 Ω 0.01 Ω
30.0 to 299.9 Ω 0.1 Ω
0.300 to 2.999 kΩ 1 Ω
3.00 to 29.99 kΩ 10 Ω