BENNING MM 2 044028 - Инструкция по эксплуатации - Страница 21

05/ 2019 

BENNING MM 2

14



8.3  Resistance Measurement

-   Select the appropriate range with the rotary switch 



 of the BENNING MM 2.

-   

Connect the black safety test lead to the COM-terminal 



 of the 

BENNING MM 2.

-   Connect the red safety test lead to the input terminal for V, Ω, 

, 



 of the 

 BENNING MM 2.

-   Connect the safety test leads to the circuit measurement points and read 

the measured value on the digital display 



 of the  BENNING MM 2.

see Figure 6: 

Resistance measurement

8.4  Diode Testing

-   Turn the rotary switch 



 of the  BENNING MM 2 to select the appropriate 

range identified by a buzzer and diode symbol.

-   

Connect the black safety test lead to the COM-terminal 



 of the 

BENNING MM 2.

-   Connect the red safety test lead to the input terminal for V, Ω, 

, 



 of the 

 BENNING MM 2.

-   Connect the safety test leads across the diodes and read the measured 

value on the digital display 



 of the  BENNING MM 2.

-   For a typical silicone diode tested in the forward-biased direction a voltage 

flow between 0,500 V and 0,900 V is displayed. A display showing "000" 

indicates a short circuit in the diode, whereas a display showing "1" indi-

cates an open circuit in the diode. 

-   For a diode tested in the reverse-biased direction the display reads "1". If 

the diode is  damaged, the display will show "000" or other values. 

see Figure 7: 

Diode Testing

8.5  Continuity Testing with Buzzer

-   Turn the rotary switch 



 of the  BENNING MM 2 to select the appropriate 

range identified by a buzzer and diode symbol.

-   

Connect the black safety test lead to the COM-terminal 



 of the 

BENNING MM 2.

-   Connect the red safety test lead to the input terminal for V, Ω, 

, 



 of the 

 BENNING MM 2.

-   Connect the safety test leads to the circuit to be measured. If the circuit 

resistance between   the COM-terminal 



  and  the  input  terminal  for  V,  Ω, 

, 



  falls  below  50  Ω,  then  the  built-in  buzzer  in  the   BENNING MM 2 

emits a continuous tone.

see Figure 8: 

Continuity Testing with buzzer

9. Maintenance



Remove test leads and turn the power off before opening the 

 BENNING MM 2! Dangerous voltage!

Any work to be carried out on an opened  BENNING MM 2 under voltage 

is 

strictly reserved for qualified electrotechnical personnel who must take 

special precautionary measures to avoid accidents.

This is how to ensure that the  BENNING MM 2 is free from any voltage before 

the instrument is opened:

-  first remove the safety test leads from measured object.

-  then remove both safety test leads from the  BENNING MM 2.

-  turn the rotary switch 



 to the "OFF" position.

9.1  Instrument safe-guarding

In certain circumstances, safety during the use of the  BENNING MM 2 can no 

longer be guaranteed; when for instance:

-  there is visible damage to the housing

-  measurement errors occur

-   the instrument has been subjected to prolonged storage under unfavorable 

conditions and

-  the instrument has been subjected to severe transport stresses.

In such cases the  BENNING MM 2 must be immediately switched off, removed 

from the measurement points and secured against any future unintentional 

operation.

9.2 Cleaning

Wipe the case of the  BENNING MM 2 with a clean dry cloth (exception: spe-

cial cleaning cloths). Do not use any solvents and/ or abrasives to clean the 

 BENNING MM 2.