Fluke 1625 FE 1625 Users Manual - Page 25

Selective Measurement of the Earthing Resistance (RE(), Measuring, Range, Display Range, Resolution

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Earth/Ground Tester Specifications Selective Measurement of the Earthing Resistance (REA) 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. Urms = 250 V (measurement will not be started) Measuring Range Display Range Resolution Intrinsic Error * Operating Error * 0.001...2.999 Ω 0.001 Ω 3.00...29.99 Ω 0.01 Ω 0.020 Ω... 30 kΩ 30.0...299.9 Ω 0.300...2.999 kΩ 0.1 Ω 1 Ω ± (7 % of m.v. +2 digit) ± (10% of m.v. +5 digit) 3.00...29.99 kΩ 10 Ω * With recommended current clamps / transformers. Additonal error because of probe- and auxiliary earth typ.electrode resistance: RH (RS + 2000Ω) ×1.25 ×10−6% + 5digits RETOTAL Measuring error of RH and RS: typ.of 10% of RETOTAL + RS + RH Measuring time: typ. 8 sec. with a fixed frequency 30 sec.max. with AFC and complete cycle of all measuring frequencies 17

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Earth/Ground Tester
Specifications
17
Selective Measurement of the Earthing Resistance
(R
E
A
)
Measuring method:
Current and voltage measurement with probe as per
EN61557-5 and current measurement in the individual
branch with additional current transformer (patent ap-
plied for).
Open circuit volt-
age:
20 / 48 V AC
Short circuit current:
250 mA AC
Measuring fre-
quency:
94, 105, 111, 128 Hz selected manually or automati-
cally (AFC), 55 Hz (R
*
)
Noise rejection:
120 dB (16 2/3 , 50 , 60 , 400 Hz)
Max. overload:
max. Urms = 250 V (measurement will not be started)
Measuring
Range
Display Range
Resolution
Intrinsic
Error *
Operating
Error *
0.001...2.999
Ω
0.001
Ω
3.00...29.99
Ω
0.01
Ω
0.020
Ω
...
30.0...299.9
Ω
0.1
Ω
30 k
Ω
0.300...2.999 k
Ω
1
Ω
± (7 % of
m.v. +2
digit)
± (10% of m.v.
+5 digit)
3.00...29.99 k
Ω
10
Ω
* With recommended current clamps / transformers.
Additonal error because
of probe- and auxiliary
earth typ.electrode resis-
tance:
digits
R
R
R
ETOTAL
S
H
5
%
10
25
.
1
)
2000
(
6
+
×
×
Ω
+
−
Measuring error of RH
and RS:
typ.of 10% of
H
S
ETOTAL
R
R
R
+
+
Measuring time:
typ. 8 sec. with a fixed frequency 30 sec.max.
with AFC and complete cycle of all measuring
frequencies