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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 (9) and the black measuring line into the COM
measuring jack (8).
- Check the measuring lines for continuity by con-
necting the two measuring prods. The impedance
value must be approximately 0 - 1.5 Ohm (inherent
impedance of the measuring lines).
- For low-impedance measurements, push the
button “REL” (11) once to not include the inherent
impedance of the measuring lines in the following
impedance measurement. The display shows a
small delta symbol and the main display shows
0 Ohm. The automatic range selection (AUTO) is
deactivated.
- 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. Pushing the “REL” button again switches off the relative
function and activates the auto range function.
- Remove the measuring lines from the object to be measured after completion of the meas-
urement and switch off the DMM.
If you perform a resistance measurement, make sure that the measuring points you
touch with the measuring prods are free of dirt, oil, solderable lacquer or similar. Such
circumstances can falsify the measured result.
Summary of Contents for 1380557
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