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BENNING CM 7
14
8.2 Voltage measuring
Do not exceed the maximum permitted voltage with respect to
earth potential! Electrical danger!
The highest voltage which may be applied to the jacks,
- COM socket
- jack for V,
of the BENNING CM 7 against ground, amounts to 1000 V.
- Use the rotary switch to select the required function (V AC) or (V DC) on
the BENNING CM 7.
- The black safety measuring cable has to be contacted with the COM jack
on the BENNING CM 7.
- The red safety measuring cable has to be connected to the jack for V,
on the BENNING CM 7.
- Bring the safety measuring lines into contact with the measuring points,
read off measured value on the digital display on the BENNING CM 7.
See figure 2: Direct voltage measurement
See figure 3: Alternating voltage measurement
8.3 Direct/ alternating current measurement
8.3.1 Preparations for making measurements
Operate and store the BENNING CM 7 only at the specified storage and operat-
ing temperatures conditions. Avoid continuous insulation.
Strong sources of interference in the vicinity of the BENNING CM 7 can lead to
unstable readings and measuring errors.
Do not apply any voltage to the output contacts of the
BENNING CM 7! Any possibly connected safety measuring
cables have to be removed.
8.3.2 Direct/ alternating current measurement
- Use the rotary switch to select the required function (A AC) or (A DC) on the
BENNING CM 7.
- Operate opening lever , clamp single wire live conductor centrally by
means of the BENNING CM 7 current probe.
- Read off the digital display unit .
See figure 4: Direct/ alternating current measurement
8.4 Resistance measuring and acoustic continuity testing
- Use the rotary switch to select the required function ( ) on the
BENNING CM 7.
- The black safety measuring cable has to be contacted with the COM jack
on the BENNING CM 7.
The red safety measuring cable has to be connected to the jack for V,
on the BENNING CM 7.
- Bring the safety measuring lines into contact with the measuring points,
read off measured value on the digital display on the BENNING CM 7.
- If the conductor resistance between the COM jack and the jack for V,
30 , the fitted buzzer sounds on the BENNING CM 7.
See figure 5: Resistance measurements
8.5 Frequency measurement via current measuring pliers
Do not apply any voltage to the output contacts of the
BENNING CM 7! Any possibly connected safety measuring ca-
bles have to be removed.
- Use the rotary switch to select the required function (Hz) on the
BENNING CM 7.
- Operate opening lever , clamp single wire live conductor centrally by
means of the BENNING CM 7 current probe.
- Read off the digital display unit .
See figure 6: Frequency measurement via current measuring pliers
9. Maintenance
Before opening the BENNING CM 7, make quite sure that it is
voltage free! Electrical danger!
Work on the opened BENNING CM 7 under voltage may be carried out only
by skilled electricians with special precautions for the prevention of accidents.
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