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05/ 2019
BENNING MM 4
15
8.6 AC current measurement with the current transducer
Do not apply voltage to the output contacts of the current
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 but-
ton 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:
AC current measurement with current transducer
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.
9.1 Securing the unit
Under certain circumstances, the safety of the BENNING MM 4 can no longer
be guaranteed. This may be the case if:
- there are visible signs of damage on the unit,
- errors occur in measurements,
- the unit has been stored for a long period of time under the wrong condi-
tions, and
- if the unit has been subjected to rough handling during transport.
In these cases, the BENNING MM 4 must be switched off immediately, removed
from the measuring points and secured to prevent it from being used again.
9.2 Cleaning
Clean the outside of the unit with a clean dry cloth. (Exception: any type of
special cleaning cloth). Never use solvents or abrasives to clean the BENNING
MM4. Always ensure that the battery compartment and the battery contacts
have not been) contaminated by electrolyte leakage.
If any electrolyte or white deposits are seen near to the battery or in the battery
compartment, remove them with a dry cloth, too.
9.3 Battery replacement
Before opening the BENNING MM 4, ensure that it is not
connected to a source of voltage! Electrical hazard!
The BENNING MM 4 is supplied by two 1.5 volt batteries. The batteries must
be changed (see Fig. 8) when the battery symbol appears in the display
3
.
To replace the battery, proceed as follows:
-
Disconnect the black safety test lead and the red test probe from the circuit.
- Disconnect the black safety test lead and the red test probe from the
BENNING MM 4.
- Lay the BENNING MM 4 on its front and release the screw in the base of
the housing.
- Lift the housing base at the socket end and remove it from the front part
close to the digital display
3
.
- Remove the discharged batteries from the battery holder.
- Insert two fresh batteries correctly into the battery holder. Check polarity.
- Push the housing base back onto the front part and replace the screw.
See fig. 8:
Battery replacement
