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Voltcraft VC155 Manual

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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 with the rotary switch (5).
2. Insert the red measuring lead into the socket (8) and the black 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” .
e) Continuity test
1. Turn the DMM on and select measuring range with the rotary switch (5).
2. Insert the red measuring lead into the socket (8) and the black 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 to the two contact points for checking continuity.
5. The display shows the continuity voltage in volt (V).
6. If “1” (towards the left side of the display) is shown, the two contact points are not in a closed circuit.
If the two end points are in a closed circuit, the resistant is less than 10 Ω, 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” .
… 32 …


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