PEWA BENNING MM 8 Instrucciones De Servicio página 20

8.6­ Capacity­measurement
Before­ carrying­ out­ capacity­ measurements­ discharge­
capacitors­completely!

Never­apply­voltage­to­the­capacity­measurement­jacks!
The­appliance­can­become­damaged­or­even­be­destroyed!­A­
damaged­appliance­may­cause­an­electrical­hazard!
- U sing the rotary switch  select the required function (­
B ENNING MM 8/ 9/ 10.
- D etermine the polarity of the capacitor and discharge capacitor complete-
ly.
- T he 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.
- T he 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:
8.7­ Frequency­measuring
- U sing the rotary switch  select the required function (­Hz) on the
B ENNING MM 8/ 9/ 10.
- T he 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.
N ote the minimum sensitivity for the frequency measurements on the
B ENNING MM 8/ 9/ 10!
- B ring 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:
9.­ Maintenance
Before­opening­the­BENNING­MM­8/­9/­0­make­quite­sure­that it

is­voltage­free!­Electrical danger!
Work on the opened BENNING MM 8/ 9/ 10 under voltage may­be­carried­out­
only­by­skilled­electricians­with­special­precautions­for­the­prevention­of­
accidents.
Make the BENNING MM 8/ 9/ 10 voltage free as follows before opening the
instrument:
- F irst remove the two safety measuring lines from the object to be meas-
ured.
- T hen disconnect the two safety measuring cables from the BENNING MM 8/ 9/ 10.
- T urn the rotary switch  to the switch setting "OFF".
9.­­Securing­the­instrument­
Under certain circumstances safe operation of the BENNING MM 8/ 9/ 10 is no
longer ensured, for example in the case of:
- V isible damage of the casing.
- I ncorrect measurement results.
- R ecognisable consequences of prolonged storage under improper condi-
tions.
- R ecognisable 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
capacity measuring
Frequency measurement
Electrical­danger!
­ B ENNING­MM­8/­9/­10­

) on the
that­it­
8