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Megger CM500 - Page 38

Megger CM500
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Basic and Service Error Calculation (Contd.)
38
Max.
Indicated
reading
1,2
1,7
2,2
2,6
3,1
4,0
5,0
5,9
6,9
7,8
12,5
17,2
21,9
26,6
31,3
36,0
40,7
45,4
54,8
Limit
70,0
80,0
90,0
100
150
200
250
300
350
400
450
500
600
700
800
900
1,00 k
1,50 k
2,00 k
Max.
Indicated
reading
64,2
73,6
83,0
92,4
139
183
230
277
324
371
418
465
559
653
747
841
935
1,41 k
2,00 k
Loop Resistance and Earth Electrode Resistance
Limit
0,10
0,15
0,20
0,25
0,30
0,35
0,40
0,45
0,50
0,60
0,70
0,80
0,90
1,00
Limit
20,0
25,0
30,0
35,0
40,0
50,0
60,0
70,0
80,0
60,0
100
150
200
250
Limit
300
350
400
450
500
600
700
800
900
1,00
1,50
2,00
2,50
3,00
Max.
Indicated
reading
0,03
0,08
0,12
0,17
0,21
0,26
0,30
0,35
0,39
0,48
0,57
0,66
0,75
0,84
Max.
Indicated
reading
17,0
21,5
26,0
30,5
35,0
44,0
53,0
62,0
71,0
80,0
89,0
125
170
215
Max.
Indicated
reading
260
305
350
395
440
530
620
710
800
0,86
1,31
1,76
2,21
2,66
Limit
1,50
2,00
2,50
3,00
3,50
4,00
4,50
5,00
6,00
7,00
8,00
9,00
10.0
15,0
Max.
Indicated
reading
1,29
1,74
2,19
2,64
3,09
3,54
3,99
4,44
5,34
6,24
7,14
8,04
8,94
12,5
Use these tables to determine the minimum indicated reading
for a limit, taking into account the maximum service error of
the instrument.
Loop Resistance 2 k 50 mA
Limit
3,0
3,5
4,0
4,5
5,0
6,0
7,0
8,0
9,0
10,0
15,0
20,0
25,0
30,0
35,0
40,0
45,0
50,0
60,0

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