Earth/Ground Tester
Specifications
15
A = intrinsic error
En = variations
R = routine test
T = type test
[]
100% x
valuefiducial
B
%B ±=
Measuring
Range
Display Range Resolution
Instrinsic
Error
Max. Op-
erating
Error
0.001 Ω...2.999 Ω 0.001 Ω
3.00 Ω...29.99 Ω 0.01 Ω
0.020 Ω 30.0 Ω...299.9 Ω 0.1 Ω
300 kΩ 0.300 kΩ...2.999 kΩ 1 Ω
± ( 2 % of
mv +2 digit )
± ( 5% of
mv +5
digit )
3.00 kΩ...29.99 kΩ 10 Ω
30.0 kΩ...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:
digits
R
RR
E
SH
5%1025.1
)2000(
6
+××
Ω+
−
Measuring error of RH and
RS:
typ. 10 % of
HsE
RRR ++
Max. probe resistance: ≤ 1 M Ω
Max. auxiliary earth elec-
trode 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 resis-
tance, a measurement error of higher than 30 % is assumed because of the in-
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