BENNING MM 3 044029 - Инструкция по эксплуатации - Страница 24

05/ 2020 

BENNING MM 3

16



8.5  Continuity Testing with Buzzer

-   Turn the rotary switch 



 of the  BENNING MM 3 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 3.

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



 of 

the  BENNING MM 3.

-   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 and 

Hz 



 falls below 50 Ω, then the built-in buzzer in the  BENNING MM 3 emits 

a continuous tone.

see Figure 8:   

Continuity Testing with buzzer

8.6  Capacitance Measurement



CAUTION! Capacitors must be completely discharged before 

attempting capacitance measurement! Never apply voltage 

to the input terminals for a capacitance measurement as this 

could destroy or damage the tester! A damaged tester may 

present an electrical shock hazard to the user!

-    

Use the rotary switch 



 to select the appropriate range on the 

BENNING MM 3.

-    Establish the polarity of the capacitor and discharge the capacitor completely.

-   Connect the fully discharged capacitor according to its polarity to the input 

terminals for capacitance measurement 



 of the  BENNING MM 3 and read 

the measurement value on the digital display 



 of the  BENNING MM 3.

see Figure 9:   

Capacity Testing 

8.7  Frequency measurement

-    

Use the rotary switch 



 to select the appropriate range on the 

BENNING MM 3.

-   Connect the black safety test lead to the COM-terminal 



 of the 

 BENNING MM 3.

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



 of 

the  BENNING MM 3. Observe the voltage range of the  BENNING MM 3 for 

frequency measurements! 

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

the measured value on the digital display 



 of the  BENNING MM 3.

see Figure 10:   

Frequency measurement

9.   Maintenance



Remove test leads and turn the power off before opening the 

 BENNING MM 3! Dangerous voltage!

Any work to be carried out on an opened  BENNING MM 3 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 3 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 3.

-  turn the rotary switch 



 to the "OFF" position.

9.1  Instrument safe-guarding

In certain circumstances, safety during the use of the  BENNING MM 3 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 3 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 3 with a clean dry cloth (exception: spe-

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

 BENNING MM 3.