Resistance Measuring - VOLTCRAFT VC-420 Mode D'emploi

f) 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:
- Turn the DMM on and select the measuring function "Ω".
- Plug the red measuring line into the Ω measuring jack (8) and the
black measuring line into the COM measuring jack (7).
- Check the measuring lines for continuity by connecting the two
measuring prods. The impedance value must be approximately
0 - 0.5 Ohm (inherent impedance of the measuring lines).
- For low-impedance measurements, push the button "REL" (2) to not
include the inherent impedance of the measuring lines in the following
impedance measurement. The display shows 0 Ohm. The automatic
area selection (AUTO) is deactivated and the current measurement
range remains fixed. The autorange function is reactivated by pushing
the button "REL" again or by switching the measuring function.
- 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 inter-
rupted, 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 measurement 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 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.
The button "REL" works only when a measured value is displayed. When "OL" is displayed, this function can-
not be activated.
45