Benning CM 1-2 Notice D'emploi page 18

8.3.2 AC current measurement
- Use the sliding switch 7 to select the desired range on the BENNING CM 1-1 or
the desired function (A AC) on the BENNING CM 1-2.
- Operate the opening lever J and clamp the single-wire live conductor
centrally by means of the clamp of the BENNING CM 1-1/ 1-2.
- Read the value indicated on the digital display 1.
See figure 4:
8.4 Resistance measurement and acoustic continuity test
(BENNING CM 1-2)
- Select the desired function (
BENNING CM 1-2.
- Connect the black safety measuring line to the COM jack 9 of the
BENNING CM 1-2.
- Connect the red safety measuring line to the jack for V and Ω 8 of the
BENNING CM 1-2.
- Bring the safety measuring lines into contact with the measuring points and
read the measured value on the digital display 1 of the BENNING CM 1-2.
- If the conductor resistance between the COM jack 9 and the jack for V
and Ω 8 falls below 20 Ω, the integrated buzzer of the BENNING CM 1-2
sounds.
See figure 5:
9. Maintenance
Before opening the BENNING CM 1‑1/ 1‑2, strictly observe that

the device is free of voltage! Electrical danger!
Working on the opened BENNING CM 1-1/ 1-2 under voltage must be carried
out by skilled electricians only who must observe special precautions for
the prevention of accidents!
Therefore, make sure the BENNING CM 1-1/ 1-2 is free of voltage before
opening the device:
- First, remove both safety measuring lines from the object to be measured.
- Then, remove both safety measuring lines from the BENNING CM 1-1/ 1-2.
- Switch the sliding switch 7 to position „OFF".
9.1 Securing the device
Under certain circumstances, safe operation of the BENNING CM 1-1/ 1-2 might
no longer be ensured, e.g. in case of:
- visible damages of the housing,
- incorrect measuring results,
- recognizable consequences of prolonged storage under inadmissible
conditions and
- recognizable consequences of extraordinary stress due to transport.
In such cases, immediately switch off the BENNING CM 1-1/ 1-2, disconnect it
from the measuring points and secure it against further use.
9.2 Cleaning
Clean the exterior of the device with a clean dry cloth (exception: special
cleaning wipers). Do not use any solvents and/ or abrasives to clean the device.
Strictly observe that the battery compartment and the battery contacts are not
contaminated by leaking battery electrolyte. If there are electrolyte contamination
or white deposits in the area of the battery or the battery housing, clean these
areas as well by means of a dry cloth.
9.3 Battery replacement
Before opening the BENNING CM 1‑1/ 1‑2, strictly observe that

the device is free of voltage! Electrical danger!
The BENNING CM 1-1 is supplied by means of an integrated 9 V block battery,
the BENNING CM 1-2 is supplied by means of two integrated 1.5 V micro
batteries. Battery replacement (see figure 6) is required, if the battery symbol 1
appears on the display 3.
Proceed as follows to replace the battery:
- Disconnect the safety measuring lines from the measuring circuit
(BENNING CM 1-2).
- Disconnect the safety measuring lines from the BENNING CM 1-2.
- Switch the sliding switch 7 to position „OFF".
- Put the BENNING CM 1-1/ 1-2 face down and unscrew the screw of the
battery compartment cover.
05/ 2008
AC current measurement
) by means of the sliding switch 7 of the
Resistance measurement
BENNING CM 1‑1/ 1‑2

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