LEM A188506510, Operating Instructions Manual

Page: 14 / 66

12
Earthing resistance (RE)
Measuring method: current and voltage measurement with probe as
IEC61557-5/EN61557-5
Open circuit voltage:
20 / 48 V, AC
Short circuit current: 250 mA AC
Measuring frequency: 94 , 105 , 111 , 128 Hz selected manually or
automatic.(AFC) 55 Hz in function R*
Noise rejection: 120 dB ( 16
2
/
3
, 50 , 60, 400 Hz )
Max. overload: Urms = 250 V
Intrinsic error or
influence quantity
Reference conditions
or specified operating
range
Designation code Requirements or test in
accordance with the
relevant parts of
IEC 1557
Type of
test
Intrinsic error Reference conditions A Part 5, 6.1 R
Position Reference position
±
90°
E 1 Part 1, 4.2 R
Supply voltage At the limits stated by
the manufacturer E 2 Part 1, 4.2, 4.3 R
Temperature 0 °C and 35 °C E 3 Part 1, 4.2 T
Series interference
voltage See 4.2 and 4.3 E 4 Part 5, 4.2, 4.3 T
Resistance of the
probes and
auxiliary earth
electrodes 0 to 100 x R
A
but
≤
50 k
Ω
E 5 Part 5, 4.3 T
System frequency 99 % to 101 % of the
nominal frequency E 7 Part 5, 4.3 T
System voltage 85 % to 110 % of the
nominal voltage E 8 Part 5, 4.3 T
Operating error
)
8
2
E
7
2
E
6
2
E
5
2
E
4
2
E
3
2
E
2
2
E
1
2
E 15 , 1 A ( B
+ ± =
Part 5, 4.3 R
A = intrinsic error
E
n
= variations
R = routine test
T = type test
[ ]
100% x
value fiducial
B
% B
± =
table 6-1
Measuring
range
Display range Resolution
instrinsic error
max.
operating
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
± ( 2 % of mv
± ( 5% of mv
300 k
Ω
0.300 k
Ω
...2.999 k
Ω
1
Ω
+2 digit ) +5 digit )
3.00 k
Ω
...29.99 k
Ω
10
Ω