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b) Resistance measuring
Make sure that all the circuit parts, switches and components and other objects of measurement
are disconnected from the voltage and discharged.
Proceed as follows to measure the resistance:
- Turn the DMM on and select measuring range “Ω”
- Plug the red measuring lead into the Ω measuring socket “+” (9) and the black
measuring lead into the Ω measuring socket.“-” (8).
- Check the measuring leads for continuity by connecting both measuring prods with
one another. After that the resistance value must be approximately 0 to 0.5 Ohm
(inherent resistance of the measuring leads).
- With low-Ohm measurements, press the button “REL” (12) to not let the inherent
resistance of the measuring leads flow into the following resistance measuring.
The display shows 0 Ohm The automatic range selection (auto range) is deacti-
vated. Reactivate the auto range function by changing the measuring function or
pressing the button “REL” for 2 seconds.
- Connect the two measuring prods to the object to be measured. As long as the object
to be measured is not high-resistive or interrupted, the measured value will be indi-
cated on the display. Wait until the display has stabilised. With resistances of >1 MOhm, this may take a few seconds.
- As soon as “OL” (overload) appears on the display, you have exceeded the measuring range or the measuring
circuit has been broken.
- After measuring, remove the measuring leads from the measuring object and turn the DMM off.
If you carry out a resistance measurement, make sure that the measuring points which you contact with the
test prods are free from dirt, oil, solderable lacquer or the like. An incorrect measurement may result under
such circumstances.
c) Continuity test
Make sure that all the circuit parts, switches and components and other objects of measurement
are disconnected from the voltage and discharged.
- Turn the DMM on and select measuring range
- The symbol for continuity check now appears in the display.
- Plug the red measuring lead into the Ω measuring socket “+” (9) and the black
measuring lead into the Ω measuring socket.“-” (8). Connect the measuring prods
to the object to be measured.
- A measuring value of less than 30 Ohm is detected and a beep sounds.
- As soon as “OL” (overload) appears on the display, you have exceeded the meas-
uring range or the measuring circuit has been broken.
- After measuring, remove the measuring leads from the measuring object and turn
the DMM off.
