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e) Impedance Measuring
Make sure that all circuit parts, circuits and components and other objects of measurement are
disconnected from the voltage and discharged.
Proceed as follows to measure impedance:
- Switch on the DMM and select the respective measuring range
“Ω/kΩ”.
- Plug the red measuring line into the Ω measuring jack (6) and the
black measuring line into the COM measuring jack (5).
- 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 measured.
As long as the object to be measured is not high-impedance or
interrupted, the measured value will be indicated on the display.
Wait until the displayed value has stabilised. With impedances of
>1 MOhm, this may take a few seconds.
- Once “OL” (= overflow) appears on the display, you have exceeded
the measuring range or the measuring circuit is interrupted.
- Remove the measuring lines from the object to be measured after
completion of the measurement and switch off the DMM.
If you carry out a resistance measurement, make sure that the measuring points you touch with the measur-
ing prods are free from dirt, oil, solderable lacquer or similar. Such circumstances can falsify the measured
result.
f) Acoustic Continuity Test
Make sure that all circuit parts, circuits and components and other objects of measurement are
disconnected from the voltage and discharged.
- Turn the DMM on and select measuring function .
- Plug the red measuring line into the V measuring jack (6) and the black measuring line into the COM measuring
jack (5).
- A continuity value of less than approx. 30 Ohm is identified as continuity; in this case a beep sounds. The display
is not relevant in this test.
- Once “OL” (= overflow) appears on the display, you have exceeded the measuring range or the measuring circuit
is interrupted.
- Remove the measuring lines from the object to be measured after completion of the measurement and switch off
the DMM.
