10/ 2019
BENNING CM 9-2
13
E13 Contact current caused by common-mode
rejection
-
E14 Frequency
-
E15 Repeatability
-
Intrinsic uncertainty (A)
see measuring accuracy, sections 7.1
Operating uncertainty (B)
10 A/ m
30 A/ m
Measured value 3.5 mA to 10 mA
< 15 %
< 20 %
Measured value > 10 mA
< 10 %
< 12.5 %
8. Measuring with the BENNING CM 9-2
8.1 Preparing the measurement
Operate and store the BENNING CM 9-2 at the specified storage and operating
temperatures only! Do not permanently expose the device to sunlight.
- Strong sources of interference in the vicinity of the BENNING CM 9-2 might
involve unstable readings and measuring errors.
8.2 Current measurement
Do not exceed the maximum permitted voltage with respect to
earth potential!
Electrical danger!
- Press the ON/OFF key
8
to switch on the BENNING CM 9-2.
- If necessary, press the LPF key
5
to enable the low-pass filter (50 Hz to
60 Hz) or the device filter (1 kHz).
- Operate opening lever
3
, clamp
1
single wire live conductor centrally by
means of the BENNING CM 9-2 current probe.
- Read off the digital display unit
6
.
8.2.1 Leakage current measurement at the ground conductor
See figure 2:
Leakage current measurement at the ground conductor
8.2.2 Differential current measurement at single-phase systems
See figure 3:
Differential current measurement at single-phase systems
8.2.3 Leakage current measurement via ground conductor (charge
eliminator) for three-phase supply
See figure 4:
Leakage current measurement via ground conductor (charge
eliminator) for three-phase supply
8.2.4 Differential current measurement, load supplied in three-phase,
without N-type conductor
See figure 5:
Differential current measurement, load supplied in three-
phase, without N-type conductor
8.2.5 Differential current measurement, load supplied in three-phase,
with N-type conductor
See figure 6:
Differential current measurement, load supplied in three-
phase, with N-type conductor
8.2.6 Alternating current measurement
See figure 7:
Alternating current measurement
9. Maintenance
Before opening the BENNING CM 9-2, make sure that it is free of
voltage! Electrical danger!
9.1 Securing the instrument
Under certain circumstances safe operation of the BENNING CM 9-2 is no
longer ensured, for example in the case of:
- Visible damage of the casing.
- Incorrect measurement results.
- Recognisable consequences of prolonged storage under improper condi
-
tions.
- Recognisable consequences of extraordinary transportation stress.
