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e) Resistance 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 resistance:
- Switch on the DMM and select the measuring range "Ω".
- Plug the red measuring line into the Ω measuring jack (10) and the black measur-
ing line into the COM measuring jack (9).
- 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).
- For low-impedance measurements (<400 Ohm), push the button "REL" (11) to
not include the inherent impedance of the measuring lines in the following imped-
ance measurement. The display shows a small delta symbol and the main display
shows 0 Ohm. The automatic range selection (AUTO) is deactivated. For any
other measurement, the inherent resistance of the measuring line is negligible.
Push the button "REL" again to reactivate reference value measurement. The
auto range function is active again
- 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.
- If "OL" (overload) 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 meas-
uring prods are free from dirt, oil, solderable lacquer or similar. Such circumstances can falsify the meas-
ured result.
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