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3. Check the measuring leads for continuity by connecting both measuring leads to one another.
After that the resistance value must be approximately 0.5 Ω (inherent resistance of the
measuring leads).
4. Now connect the 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 indicated on
the display. Wait until the display has stabilised. With resistances of >1 MΩ, this may take
a few seconds.
5. As soon as "1" (towards the left side of the display) appears on the display, you have
exceeded the measuring range or the measuring circuit has been broken. Select a larger
measuring range if necessary.
6. After measuring, remove the measuring leads from the measuring object and turn the DMM
off. Turn the rotary switch (5) to the position "OFF".
If you carry out a resistance measurement, make sure that the measuring points which
you contact with the measuring prods are free from dirt, oil, solderable lacquer or
similar. An incorrect measurement may result under such circumstances.
d) Diode test
Make sure that all the circuit parts, switches and components and other
objects of measurement are disconnected from the voltage and discharged.
1. Turn the DMM on and select measuring range
2. Insert the red measuring lead into the
COM socket (9).
3. Check the measuring leads for continuity by connecting both measuring prods to one another.
After that the value must be approximately 0 V. An acoustic signal can be heard.
4. Now connect the two measuring prods with the object to be measured (diode).
5. The display shows the continuity voltage in volt (V). Open-circuit voltage is about 2.6 V.
6. If "1" (towards the left side of the display) is shown, the diode is measured in reverse direction
or the diode is faulty (interruption). Perform a counter-pole measuring for control reasons. The
red measuring lead corresponds to the positive pole (anode), the black measuring lead to the
negative pole (cathode). A silicone diode has an on-state voltage of approx. 0.5 – 0.8 V. If the
diode is place in the correct direction, an acoustic signal can be heard.
7. After measuring, remove the measuring leads from the measuring object and turn the DMM
off. Turn the rotary switch (5) to the position "OFF" .
with the rotary switch (5).
socket (8) and the black measuring lead into the
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