D) Resistance Measuring; Diode Test - VOLTCRAFT VC950 Bedienungsanleitung

d) Impedance Measurement
Make sure that all circuit parts, circuits and compo-
nents and other objects of measurement are discon-
nected from the voltage and discharged.
Proceed as follows to measure impedance:
- Switch on the DMM and select measuring range "Ω".
- Plug the red measuring line into the Ω measuring jack (7) and
the black measuring line into the COM measuring jack (8).
- Check the measuring lines for continuity by connecting the two
measuring prods. The impedance value must be approximately
0 - 1.5 Ohm (inherent impedance of the measuring lines).
- Now connect the two measuring prods to the object to be measu-
red. As long as the object to be measured is not high-impedance
or interrupted, the measured value will be indicated on the dis-
play. Wait until the displayed value has stabilised. With impedan-
ces of >1 MOhm, this may take a few seconds.
- If "OL" (overload) appears on the display, you have exceeded the
measuring range or the measuring circuit is interrupted.
- Always remove the measuring lines from the object to be measured after completion of the measurement and
switch off the DMM.
If you carry out an impedance measurement, make sure that the measuring points you touch with the measu-
ring prods are free from dirt, oil, solderable lacquer or similar. Such circumstances can falsify the measured
result.
e) Diode Test
Make sure that all circuit parts, circuits and com-
ponents and other objects of measurement are
disconnected from the voltage and discharged.
- Switch on the DMM and select the measuring range
Press the button
The diode symbol appears in the display. Pressing this button
again takes you to the first measuring function, etc.
- Plug the red measuring line into the Ω measuring jack (7) and
the black measuring line into the COM measuring jack (8).
- Check the measuring lines for continuity by connecting the two
measuring prods. The value must be approximately 0.00 V.
- Connect the two measuring prods with the object to be measured
(diode).
- The display shows the continuity voltage "UF" in volt (V). If
"OL" appears, the diode is measured in reverse direction (UR)
or the diode is faulty (interruption). Perform a counter-pole
measurement to check.
- Always remove the measuring lines from the object to be mea-
sured after completion of the measurement and switch off the
DMM.
to switch measurement functions.
.
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