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h) Capacity Measuring
Make sure that all circuit parts, circuits and components and other objects of measurement are
disconnected from the voltage and discharged.
Always observe polarity with electrolyte capacitors.
- Switch on the DMM and select measuring range
- Plug the red measuring line into the V measuring jack (10) and the black measur-
ing line into the COM measuring jack (9).
- The display shows the unit "nF".
Due to the sensitive measuring input, the display may show a low value if
the measuring lines are "open". By pressing the button "REL", the display
is set to "0". The REL function is only sensible at low capacities.
- Now connect the two measuring prods (red = plus/black = minus) with the object
to be measured (capacitator). After a short time the display shows the capacity.
Wait until the displayed value has stabilised. This may take a few seconds for
capacities of >40 µF.
- If "OL" (overload) appears on the display, you have exceeded the measurement
range.
- Remove the measuring lines from the object to be measured after completion of
the measurement and switch off the DMM.
i) Contact-free AC voltage detection "NCV"
The voltage detector only serves quick tests and never contacted two-pole voltage testing. The
method is not permitted to verify freeness from voltage for work.
The NCV function ("Non-Contact-Voltage Detection") leads to contact-free detection of the presence of an alternating
voltage in electrical conductors. The NCV sensor (1) is attached at the top of the current sensor.
- Switch on the DMM and select the measuring range "NCV". The display shows "EF" (elec-
trical field).
- Bring the NCV sensor as close as possible towards the electrical conductor. The distance
must not exceed 10 mm.
- If alternating voltage is detected, the red NCV-LED (3) will flicker. Depending on signal
strength, up to 4 bars are displayed and a rising signal sounds.
- The highly sensitive NCV sensor may also cause the LED to light up at static charge. This
is normal and not a malfunction.
Always test the NCV function at a known AC voltage source to avoid incorrect detection. There is a danger
of electric shock at incorrect detection.
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