d) Resistance Measuring
Make sure that all the circuit parts, switches and components and other objects of
measurement are disconnected from the voltage and discharged.
• Turn the DMM on and select measuring function
“Ω”.
•
Plug the red measuring line into the Ω measur
-
ing jack (9) and the black measuring line into the
COM measuring jack (8) .
• Check the measuring lines for continuity by con-
necting both measuring prods with one another.
The resistance value must be approximately 0 -
0.5 Ohm (inherent resistance of the measuring
lines).
• Now connect the measuring prods to the object
to be measured. As long as the object to be
measured is not high-Ohm or interrupted, the
measured value will be indicated on the display.
Wait until the displayed value has stabilised. With
resistances 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 has been broken.
• After measuring, remove the measuring lines from the measured object and turn the DMM off.
If you carry out a resistance measurement, make sure that the measuring points which
you contact with the test prods are free from dirt, oil, solderable lacquer or the like.
Such circumstances can falsify the measured result.
61
