Fluke 1623-2 Datasheet - Page 7

Selective measurement of the, earthing resistance R

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Measuring Range 0.020 Ω to 300 kΩ Display Range 0.001 Ω to 2.999 Ω 3.00 Ω to 29.99 Ω 30.0 Ω to 299.9 Ω 0.300 kΩ to 2.999 kΩ 3.00 kΩ to 29.99 kΩ 30.0 kΩ to 299.9 kΩ Resolution 0.001 Ω 0.01 Ω 0.1 Ω 1 Ω 10 Ω 100 Ω Accuracy ± ( 2 % of rdg + 2 digit ) Operating Error ± ( 5 % of rdg + 5 digit ) Measuring time Additional error because of probe-and auxiliary earth electrode resistance typ. 8 sec. with a fixed frequency 30 sec. max. with AFC and complete cycle of all measuring frequencies Measuring error of RH and RS Max. probe resistance Max. auxiliary earth electrode resistance typ. 10 % of RE + RS + RH ≤ 1 MΩ ≤ 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 RS or RH are too high. Automatic switchover of measuring resolution in dependence to auxiliary earth electrode resistance RH RH with Umeas = 48 V < 300 Ω < 6 kΩ < 60 kΩ < 600 kΩ RH with Umeas = 20 V < 250 Ω < 2.5 kΩ < 25 kΩ < 250 kΩ Resolution 1 mΩ 10 mΩ 100 mΩ 1 Ω 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 Ω to 30 kΩ Display range 0.001 to 2.999 Ω 3.00 to 29.99 Ω 30.0 to 299.9 Ω 0.300 to 2.999 kΩ 3.00 to 29.99 kΩ * With recommended current clamps/transformers. Resolution 0.001 Ω 0.01 Ω 0.1 Ω 1 Ω 10 Ω Intrinsic error* Operating error* ± (7 % of rdg + 2 digit) ± (10 % of rdg + 5 digit) MyFlukeStore Shop for Fluke products online at: www. .com 1.877.766.5412

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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 k
Ω
3.00
Ω
to 29.99
Ω
0.01
Ω
30.0
Ω
to 299.9
Ω
0.1
Ω
0.300 k
Ω
to 2.999 k
Ω
1
Ω
3.00 k
Ω
to 29.99 k
Ω
10
Ω
30.0 k
Ω
to 299.9 k
Ω
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 M
Ω
Max. auxiliary earth electrode resistance
≤
1 M
Ω
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 m
Ω
< 6 k
Ω
< 2.5 k
Ω
10 m
Ω
< 60 k
Ω
< 25 k
Ω
100 m
Ω
< 600 k
Ω
< 250 k
Ω
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 k
Ω
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 k
Ω
1
Ω
3.00 to 29.99 k
Ω
10
Ω
* With recommended current clamps/transformers.
Shop for Fluke products online at:
1.877.766.5412
www.
MyFlukeStore
.com