Fluke 1623 Fluke 1623 and 1625 Geo Earth Ground Testers Datasheet - Page 8

Selective measurement of the earthing, resistance R - manual

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Automatic switchover of measuring resolution in dependence to auxiliary earth electrode resistance RH RH with Umeas = 48 V < 300 7 RH with Umeas = 20 V < 250 7 Resolution 1 m7 < 6 k7 < 2.5 k7 10 m7 < 60 k7 < 25 k7 100 m7 < 600 k7 < 250 k7 17 Selective measurement of the earthing resistance (RE ) Measuring method Open circuit voltage Short circuit current Measuring frequency Noise rejection Max. overload Current and voltage measurement with probe as per EN61557-5 and current measurement in the individual branch with additional current transformer (patent applied for). 20/48 V ac 250 mA ac 94, 105, 111, 128 Hz selected manually or automatically (AFC), 55 Hz (R*) 120 dB (162/3, 50, 60, 400 Hz) Max. Urms = 250 V (measurement will not be started) Measuring Range 0.020 7 to 30 k7 Display range 0.001 to 2.999 7 3.00 to 29.99 7 30.0 to 299.9 7 0.300 to 2.999 k7 3.00 to 29.99 k7 * With recommended current clamps/transformers. Additonal error because of probe- and auxiliary earth typ. electrode resistance Resolution 0.001 7 0.01 7 0.1 7 17 10 7 Intrinsic error* Operating error* ± (7 % of rdg + 2 digit) ± (10 % of rdg + 5 digit) Measuring error of RH and RS Measuring time Minimal current in single branch to be measured Max. interference current through transformer Typ. of 10 % of RETOTAL + RS + RH Typ. 8 sec. with a fixed frequency 30 sec. max. with AFC and complete cycle of all measuring frequencies 0.5 mA With transformer (1000:1) 0.1 mA With transformer (200:1) 3A With a transformer (1000:1) 8 Fluke Corporation 1623 and 1625 GEO Earth Ground Testers

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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
< 250
1m
< 6 k
< 2.5 k
10 m
< 60 k
< 25 k
100 m
< 600 k
< 250 k
1
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
to 30 k
0.001 to 2.999
0.001
± (7 % of rdg + 2 digit)
± (10 % of rdg + 5 digit)
3.00 to 29.99
0.01
30.0 to 299.9
0.1
0.300 to 2.999 k
1
3.00 to 29.99 k
10
* 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
3A
With a transformer (1000:1)