08/ 2008
BENNING MM 1
12
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.
- 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 across the diodes and read the measured
value on the digital display
of the BENNING MM 1.
- For a typicale silicone diode tested in the forward-based direction a voltage
flow between 0,500 V and 0,900 V is displayed. A display showing"000 V"
indicates a short circuit in the diode, whereas a display showing "1,5 V"
indicates an open circuit in the diode.
- For a diode tested in the reverse-based direction the display reads "1,5 V".
If the diode is damaged, the display will show "000 V" or other values.
see Figure 7:
Diode Testing
9. Maintenance
Remove test leads and turn the power off before opening the
BENNING MM 1! Dangerous voltage!
Any work to be carried out on an opened BENNING MM 1 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 1 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 1.
- turn the rotary switch
to the "OFF" position.
