Current Measurement; Maintenance - Benning CM 9-1 Bedienungsanleitung

8.3 Current measurement

Do not apply any voltage to the input jacks J and K of the

BENNING CM 9-1! Any possibly connected safety measuring
leads have to be removed.
- Use the rotary switch 5 to select the required function mA
BENNING CM 9-1.
- If necessary, press the ZERO key 6 for 2 seconds to enable the low-pass
filter (LPF).
- Press the "ZERO" button 6 to set the BENNING CM 9-1 to the starting
point.
- Operate opening lever 4 , clamp 1 single wire live conductor centrally by
means of the BENNING CM 9-1 current probe.
- Read off the digital display unit 9 .
8.3.1 Leakage current measurement at the ground conductor
See figure 4:
8.3.2 Differential current measurement at single-phase systems
See figure 5:
8.3.3 Leakage current measurement via ground conductor (charge
eliminator) for three-phase supply
See figure 6:
8.3.4 Differential current measurement, load supplied in three-phase,
without N-type conductor
See figure 7:
8.3.5 Differential current measurement, load supplied in three-phase,
with N-type conductor
See figure 8:
8.3.6 Alternating current measurement
See figure 9:
8.4 Resistance measurement
- Select the function
CM 9-1.
- The black safety measuring lead has to be contacted with the COM jack J
on the BENNING CM 9-1.
- Connect the red safety measuring lead to the V-Ω jack K , marked in red.
- Bring the safety measuring leads into contact with the measuring points,
read off measured value on the digital display 9 on the BENNING CM 9-1.
Note:
- To obtain a correct measurement, ensure that no voltage is applied to the
measuring point.
See figure 10:
8.5 Continuity testing with buzzer
- Use the rotary switch 5 to select the required function
BENNING CM 9-1 and press the „PEAK" key 7 .
- The black safety measuring lead has to be contacted with the COM jack J
on the BENNING CM 9-1.
- Connect the red safety measuring lead to the V-Ω jack K , marked in red.
- Apply the safety measuring leads to the measuring points. If the resistance
between the measuring points falls below approx. 45 Ω, the integrated buzz-
er of the BENNING CM 9-1 sounds.
See figure 11:
9.

Maintenance

Before opening the BENNING CM 9-1, make sure that it is free of

voltage! Electrical danger!
Work on the opened BENNING CM 9-1 under voltage may be carried out only
by skilled electricians with special precautions for the prevention of ac-
cidents.
Make sure that the BENNING CM 9-1 is free of voltage as described below
10/ 2019
Leakage current measurement at the ground conductor
Differential current measurement at single-phase systems
L eakage current measurement via ground conductor (charge
eliminator) for three-phase supply
D ifferential current measurement, load supplied in three-
phase, without N-type conductor
D ifferential current measurement, load supplied in three-
phase, with N-type conductor
Alternating current measurement
by means of the rotary switch 5 of the BENNING
Resistance measurement
Continuity testing with buzzer
BENNING CM 9-1

 or A  on the
on the
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