Benning MM 8 - Page 20

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8.6 Capacity measurement
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Before carrying out capacity measurements discharge
capacitors completely!
Never apply voltage to the capacity measurement jacks!
The appliance can become damaged or even be destroyed! A
damaged appliance may cause an electrical hazard!
- Using the rotary switch  select the required function ( ) on the
BENNING MM 8/ 9/ 10.
- Determine the polarity of the capacitor and discharge capacitor complete-
ly.
- The black safety measuring cable has to be connected to the COM jack 
on the BENNING MM 8/ 9/ 10.
- The red safety measuring cable has to be connected to the jack for V, Ω,
µA, , Hz  on the BENNING MM 8/ 9/ 10.
- The safety measuring lines have to be brought into contact with the dis-
charged capacitor according to its polarity, read off measured value on the
digital display  on the BENNING MM 8/ 9/ 10.
see figure 9: capacity measuring
8.7 Frequency measuring
- Using the rotary switch  select the required function (Hz) on the
BENNING MM 8/ 9/ 10.
- The black safety measuring cable has to be connected to the COM jack
 on the BENNING MM 8/ 9/ 10.
- The red safety measuring cable has to be connected to the jack for V, Ω,
µA, , Hz  on the BENNING MM 8/ 9/ 10.
Note the minimum sensitivity for the frequency measurements on the
BENNING MM 8/ 9/ 10!
- Bring the safety measuring lines into contact with the measuring points, read
off measured value on the digital display  on the BENNING MM 8/ 9/ 10.
see figure 10: Frequency measurement
9. Maintenance
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Before opening the BENNING MM 8/ 9/ 10 make quite sure that itthat it
is voltage free! Electrical danger!Electrical danger!
Work on the opened BENNING MM 8/ 9/ 10 under voltage may be carried out
only by skilled electricians with special precautions for the prevention of
accidents.
Make the BENNING MM 8/ 9/ 10 voltage free as follows before opening the
instrument:
- First remove the two safety measuring lines from the object to be meas-
ured.
- Then disconnect the two safety measuring cables from the BENNING MM 8/ 9/ 10.
- Turn the rotary switch  to the switch setting ”OFF”.
9.1 Securing the instrument
Under certain circumstances safe operation of the BENNING MM 8/ 9/ 10 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 condi-
tions.
- Recognisable consequences of extraordinary transportation stress.
In such cases the BENNING MM 8/ 9/ 10 must be switched off immediately, dis-
connected 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 instru-
ment. 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.
11/ 2006 BENNING MM 8/ 9/ 10