Resistance Measurement; Diode Test - VOLTCRAFT VC-890 Bedienungsanleitung

e) Resistance measurement
Make sure that all circuit parts, switches and components, and other objects of
measurement are disconnected from the voltage and discharged at all times.
Proceed as follows to measure resistance:
1. Turn on the DMM and select the measuring range "Ω".
2. Insert the red test lead in the °CHzVΩ measuring socket (7),
the black test lead in the COM measuring socket (8) (Fig. 5).
3. Check the test leads for continuity by connecting the test
prods with one another. After that the resistance value must be
approximately 0 – 1.5 Ω (inherent resistance of the test leads).
4. For low-resistance measurements, press the REL/PC
(Log/◄) button (10c) to prevent the inherent resistance of the
test leads from being included in the subsequent resistance
measurement. The delta symbol
and 0 Ω is indicated. The automatic range selection (AUTO) is
deactivated. The base value (Rel difference) is displayed next
to the delta symbol
5. Now connect the two test prods with the object to be measured. As long as the object to be
measured is not high-resistive or interrupted, the measured value will be indicated on the display.
Wait until the display has stabilised. This can take a few seconds for resistances >1 MΩ.
6. If "OL" (for overload) appears on the display, your measurement is above the measuring range
or the measurement circuit is broken. Pressing the REL/PC (Log/◄) button again turns off the
relative function and activates the autorange function.
7. After the measurement has been completed, remove the test leads from the object being
measured and turn the DMM off.
When you carry out a resistance measurement, make sure that the measuring points which you
contact with the measuring prods are free from dirt, oil, soldering varnish or similar. An incorrect
measurement may result under such circumstances.
f) Diode test
Make sure that all circuit parts, switches and components, and other objects of
measurement are disconnected from the voltage and discharged at all times.
62
appears on the display
.
Fig. 5