Measuring With The Benning Cm; Electrical Hazard - Benning CM 12 Bedienungsanleitung

7.8 Measuring input of flexible AC current transformer
Function
A AC
A AC HFR
PEAK-HOLD
INRUSH
Frequency
THD
H01 - H12
The measuring accuracy of the flexible current transformer BENNING CFlex 1
[1]
(item no. 044068) has not been taken into consideration.
Measuring range below 300 digits plus 3 digits
[2]
Trigger current: > 1 % of the measuring range
[3]
Indication below the minimum sensitivity (< 30 A
[4]
8.

Measuring with the BENNING CM 12

8.1 Preparation for measuring
Store and use the BENNING CM 12 only under the correct temperature condi-
tions stated. Always avoid longer exposure to sunlight.
- Check the rated voltage and rated current stated on the safety measuring
leads. The safety measuring leads supplied with the unit are suitable for the
rated voltage and current of the BENNING CM 12.
- Check the insulation of the safety measuring leads. If the insulation is dam-
aged in any way, do not use the leads.
- Check the continuity of the safety measuring leads. If the conductor in the
safety measuring lead is interrupted, do not use the leads.
- Before selecting another function with the rotating switch 5 , always discon-
nect the safety measuring leads from the measuring point.
- Sources of strong current in the vicinity of the BENNING CM 12 may cause
unstable or incorrect readings.
8.2 Voltage and current measurement
Always observe the maximum voltage to earth potential!


Electrical hazard!

The maximum voltage which may be applied to the sockets,
- COM socket O
- socket + P
of the BENNING CM 12 to earth is 600 V CAT IV/ 1000 V CAT III.
8.2.1 Voltage measurement
- Use the rotary switch 5 to select the desired function
MODE key 8 to select the coupling mode at the BENNING CM 12.
- Connect the black safety measuring lead to the COM socket O on the
BENNING CM 12.
- Connect the red safety measuring lead to the socket + P on the
BENNING CM 12.
- Connect the safety measuring leads to the measuring points. Read the
measurement value displayed in the digital display J .
See figure 2:
See figure 3:
8.2.2 Current measurement
- Use the rotary switch 5 to select the desired function
MODE key 8 to select the coupling mode at the BENNING CM 12.
Press the null balance key ZERO 9 (2 seconds) to switch the
-
BENNING CM 12 to the initial mode (coupling mode: DC, AC+DC).
- Operate the opening lever 4 and clamp the single-wire live conductor cen-
trally by means of the clamp 1 .
- Read the measurement value displayed in the digital display J of the
BENNING CM 12.
See figure 4:
08/ 2018
Measuring range
(1mV/1A)
300.0 A/ 3000 A
300.0 A/ 3000 A
420.0 A/ 4200 A
300.0 A/ 3000 A
99.99 Hz/ 999.9 Hz
99.9 %
99.9 %
Direct voltage measurement
Alternating voltage (frequency measurement)
Direct current/ Alternating current measurement (frequency
BENNING CM 12
Measurement accuracy
± 1 % + 5 digits (50 Hz - 500 Hz)
± 1 % + 5 digits (50 Hz - 60 Hz)
± 5 % + 5 digits (61 Hz - 400 Hz)
± 3 % + 80 digits (50 Hz - 500 Hz)
± 2 % + 10 digits (50 Hz - 60 Hz)
± 0.5 % + 3 digits (< 500 Hz)
± 5 % + 10 digits
± 5 % + 10 digits
): „rdy"
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
[1]
[2]
[2]
[2]
[3]
[4]
[4]
and press the
and press the
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