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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 kΩ 0.300...2.999 kΩ 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 resis-
tance:
digits
R
RR
ETOTAL
SH
5%1025.1
)2000(
6
+××
Ω+
−
Measuring error of RH
and RS:
typ.of 10% of
HSETOTAL
RRR ++
Measuring time:
typ. 8 sec. with a fixed frequency 30 sec.max.
with AFC and complete cycle of all measuring
frequencies