Resistance Measurement; Important; Diode Testing; Maintenance - Benning MM 4 Instrucciones De Servicio

8.3 Resistance measurement

- With the slide switch 2, the function button 4 and the RANGE button 6 of
the BENNING MM 4, select the desired range.
- Plug the black safety test lead into the COM socket 7 (black).
- Plug the red test probe into the V-Ω socket 8 (red).
- Contact the measurement points with the black safety test lead and the red
test probe. The measured value appears in the digital display 3.

Important:

To obtain accurate measurements, ensure that no voltage is applied to the
measuring point.
With smaller resistances, the result can be improved by measuring the resist-
ance of the safety test lead beforehand by short-circuiting the test probe and
subtracting this resistance figure from the result.
See fig. 4:
8.4 Continuity test with buzzer
- With the slide switch 2 and the function button 4 select the range marked
with the buzzer symbol „
- Plug the black safety test lead into the COM socket 7 (black).
- Plug the red test probe into the V-Ω socket 8 (red).
- Contact the measurement points with the black safety test lead and the red
test probe. When the resistance between the measuring points drops below
50 Ω, the buzzer integrated in the BENNING MM 4 sounds.
See fig. 5:

8.5 Diode testing

- With the slide switch 2 and the function button 4 select the range marked
with the diode symbol „
- Plug the black safety test lead into the COM socket 7 (black).
- Plug the red test probe into the V-Ω socket 8 (red).
- Contact the diode connections with the black safety test lead and the red test
probe. The value measured appears in the digital display 3.
- For Si diodes located in conducting direction, the flow voltage of 0.500 V to
0.900 V is indicated. The reading "000" indicates a short circuit in the diode,
and the reading "OL" an interruption in the diode.
- For a diode located in the non-conducting direction "OL" appears. If the
diode is defective, "000" or other figures appear.
See fig. 6:
8.6 AC current measurement with the current transducer
Do not apply voltage to the output contacts of the current
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transducer. The current transducer should be applied to a live
conductor only when it is connected with the Multimeter.
Max. current of enclosed current transducer 300 A!
8.6.2 Current measurement
- Contact the current transducer firmly with the Multimeter.
- Switch on the voltage measurement on the Multimeter. Press the blue
button 2 s and select the desired range with the RANGE button. (Amp
CLAMP)
- Press the opening lever 9. With the current transducer, grip the single-wire
conductor with the current to be measured.
- The reading appears in the digital display 3.
See fig. 7:
9.

Maintenance


Before opening the BENNING MM 4, always ensure that it is not
connected to a source of voltage! Electrical hazard!
Any work required on the BENNING MM 4 when it is under voltage must be
done only by a qualified electrician. Special steps must be taken to pre-
vent accidents.
Before opening the BENNING MM 4, remove it from all sources of voltage as
follows:
- First remove the black safety test lead and the red test probe from the
object being measured.
- Remove the black safety test lead and the red test probe from the
BENNING MM 4.
- Switch the sliding switch 2 to the "OFF" position.
11/ 2008
Resistance measurement
" on the BENNING MM 4.
Continuity test with buzzer
" on the BENNING MM 4.
Diode testing
AC current measurement with current transducer
BENNING MM 4
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