Benning CM 7 Instrucciones De Servicio página 16

- Check the insulation of the safety measuring cables. Discard the safety
measuring cables immediately if the insulation is damaged.
- Check safety measuring lines for continuity. If the conductor in the safety
measuring line is interrupted, the safety measuring line must be quarantined
immediately.
- Before - at the rotary switch  a different function is selected, the safety
measuring lines must be disconnected from the measuring point.
- Strong sources of interference in the vicinity of the BENNING CM 7 can
lead to unstable readings and measuring errors.
8.2­ Voltage­measuring
Do­not­exceed­the­maximum­permitted­voltage­with­respect­to­

earth­potential!­Electrical­danger!
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/­alternating­current­measurement
8.3.1 Preparations for making measurements
Operate and store the BENNING CM 7 only at the specified storage and
operating 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

BENNING­CM­7!­ Any­ possibly­ connected­ safety­ measuring­
cables­have­to­be­removed.
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 Resistance­measuring­and­acoustic­continuity­testing
- 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:
11/ 2006
Direct voltage measurement
Alternating voltage measurement
Direct/ alternating current measurement
Resistance measurements
B ENNING CM 7

) on the
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