Maintenance - Benning CM 7 Instrucciones De Servicio

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:
See figure 3:
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:
8.4 Resistance measuring and acoustic continuity testing
- Use the rotary switch  to select the required function (
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:
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:
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.
02/ 2011
Direct voltage measurement
Alternating voltage measurement
Direct/ alternating current measurement
Resistance measurements
Frequency measurement via current measuring pliers
BENNING CM 7

) on the
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