Benning CM 7 Bedienungsanleitung Seite 17

8.5­ Frequency­measurement­via­current­measuring­pliers
Do­ not­ apply­ any­ voltage­ to­ the­ output­ contacts­ of­ the­ ­

­ B ENNING­CM­7!­Any­­possibly­connected­safety­measuring­ca-
bles­have­to­be­removed.
­­
- 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
Before­opening­the­BENNING­CM­7,­make­quite­sure­ that­it­is­

voltage­free!­Electrical­danger!
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.
Make the BENNING CM 7 voltage free as follows before opening the
instrument:
- First remove the two safety measuring lines from the object to be
measured.
- Then disconnect
BENNING CM 7.
- Turn the rotary switch  to the switch setting "OFF".
9.­­Securing­the­instrument­
Under certain circumstances safe operation of the BENNING CM 7 is no longer
ensured, for example in the case of:
- Visible damage of the casing.
- Incorrect measurement results.
- Recognisable consequences of prolonged storage under improper
conditions.
- Recognisable consequences of extraordinary transportation stress.
In such cases the BENNING CM 7 must be switched off immediately,
disconnected from the measuring points and secured to prevent further
utilisation.
9.2­ Cleaning
Clean the casing externally with a clean dry cloth (exception: special cleaning
wipers). Avoid using solvents and/ or scouring agents for cleaning the
instrument. It is important to make sure that the battery compartment and
battery contacts are not contaminated by leaking electrolyte.
If electrolyte contamination or white deposits are present in the region of the
batteries or battery casing, clean them too with a dry cloth.
9.3­ Battery­change­
Before­opening­the­BENNING­CM­7,­make­quite­sure­ that­it­is­

voltage­free!­Electrical­danger!
The BENNING CM 7 is fed by a 9 V block battery.
A battery change (see Figure 7) is required, if the battery symbol  appears
in the display .
Proceed as follows to replace the batteries:
- Disconnect the safety measuring cables from the measuring circuit.
- Disconnect the safety measuring cables from the BENNING CM 7.
- Set the rotary switch  to the switch setting "OFF".
- Lay the BENNING CM 7 face down and release the screws of the battery
compartment cover.
- Lift the battery compartment lid (in the housing recess area) from the bottom
section.
- Lift the discharged battery from the battery compartment and disconnect the
battery supply lines from the battery.
11/ 2006
Frequency measurement via current measuring pliers
the two
B ENNING CM 7
safety measuring

cables from the
5