Operation Manual

09/ 2013 BENNING MM 1 12

- Check test lead continuity. If the conductor in the test lead is damaged, the
leads should be discarded immediately.
- Remove test leads from circuit to be measured before turning the rotary
switch  to select another function.
- If the BENNING MM 1 is used near strong noise generating sources, the
display may become unstable and measurement errors may arise.
8.2 Voltage measurement

To avoid electrical shock, observe the maximum rated voltage
to earth ground !
The maximum rated voltage that should be applied between any of the following
terminals of the BENNING MM 1 and earth ground is 600 V.
- COM terminal 
- Input terminal for V, , and µA, 
8.2.1 Voltage measurement
- Select the appropriate voltage type with the rotary switch  of the
BENNING MM 1.
- Select manual range by pressing "RANGE" button if required.
- Connect the black safety test lead to the COM-terminal  of the
BENNING MM 1.
- Connect the red safety test lead to the input terminal for V,  and µA,  of
the BENNING MM 1.
- Connect the safety test leads to the circuit measurement points and read
the measured value on the digital display  of the BENNING MM 1.
see Figure 2: Direct voltage measurement
see Figure 3: Alternating voltage measurement
8.3 Direct current measurement
- Select the range of direct current with the rotary switch  of the
BENNING MM 1.
- Select manual range by pressing "RANGE" button if required.
- Connect the black safety test lead to the COM-terminal  of the
BENNING MM 1.
- Connect the red safety test lead to the input terminal for V, Ω, µA,  of the
BENNING MM 1.
- Connect the safety test leads to the circuit measurement points and read
the measured value on the digital display  of the BENNING MM 1.
see Figure 4: DC current measurement
8.4 Resistance Measurement
- Select the Ohm symbol Ω with the rotary switch  of the
BENNING MM 1.
- Select manual range by pressing "RANGE" button if required.
- Connect the black safety test lead to the COM-terminal  of the
BENNING MM 1.
- Connect the red safety test lead to the input terminal for V,  and µA,  of
the BENNING MM 1.
- Connect the safety test leads to the circuit measurement points and read
the measured value on the digital display  of the BENNING MM 1.
see Figure 5: Resistance measurement
8.5 Continuity Testing with Buzzer
- Turn the rotary switch  of the BENNING MM 1 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 1.
- Connect the red safety test lead to the input terminal for V, , µA,  of the
BENNING MM 1.
- Connect the safety test leads to the circuit measurement points. If the circuit
resistance between the COM-terminal  and the input terminal for V, Ω
and µA,  falls below 20 Ω, then the built-in buzzer in the BENNING MM 1
emits a continous tone.
- By means of the "RANGE" key, it is possible to change between the func-
tions continuity test and diode test.
see Figure 6: Continuity Testing with buzzer
8.6 Diode Testing
- Turn the rotary switch  of the BENNING MM 1 to select the appropriate
range identified by a buzzer and diode symbol ,
- Press the "RANGE" key to change to diode test function.