METREL A 1501, Instruction Manual

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Flex current clamps A 1501, A 1502 and A 1503
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6.1 Effective current measuring range
Technical specification of current clamp present many different errors which are
influenced by various parameters (position, temperature). Most of them can be
minimised in controlled laboratory use. However in the field ideal measurement
condition can hardly be met. Therefore we recommend selecting clamp measuring
range according to the
Effective measurement range , shown in table below.
Effective measurement range is range where measurement error is less than 5 % of
measured value (reading), and includes all relevant errors (residual noise, clamp
accuracy, position sensitivity and instrument accuracy).
Effective measuring range
3A 30A
300A
3000A 30000A
3000A range
Error > 5%
Pure sin
wave
Effective measuring range
Pure sin
wave
15A
600A
Effective measuring range
Pure sin
wave
60A
300A range
30A range
6000A
Error > 5%
80A
Error > 5%
1A
45A
450A
4500A
Figure 3: A 1501 and A 1502 effective measuring range (error is <5% of m.v.)
Effective measuring range
6A
60A
600A
6000A 60000A
6000A range
Error > 5%
Pure sin
wave
Effective measuring range
Pure sin
wave
30A
1200A
Effective measuring range
Pure sin
wave
120A
600A range
60A range
12kA
Error > 5%
160A
Error > 5%
1A
90A
900A
9000A
Figure 4: A 1503 effective measuring range (error is <5% of m.v.)