C) Contact-Free Ac Voltage Recognition (Ncv) - VOLTCRAFT VC-13 Operating Instructions Manual

c) Contact-free aC voltage recognition (NCV)

This function is not admissible to determine voltage freeness in electrical
systems. for this, a 2-pole measurement must be performed at all times.
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 (6a) is attached at the
front of the meter.
A possible alternating voltage is displayed visually via the light
indicator (6) and acoustically. The display shows the function
"NCv" by four dashes "- - - -".
- This function needs no measuring lines. Attach the measuring
line to the measuring prod holders (10) at the rear of the
device.
- Switch on the DMM and keep the button "NCv" (2) pushed for
the duration of the NCv function.
- Move the meter with the front to a known AC voltage source.
Always perform this test to avoid wrong detection. The meter
starts to bleep at alternating voltage and the indicator light (6)
flashes.
- Perform the test at the intended line, etc.
- Release the button "NCv" after completing the test and switch
off the DMM.
The highly sensitive NCv sensor may also cause a voltage
recognition at static charge. This is normal and not a
malfunction.
The sensitivity is influenced by many unknown factors such as lines placed lower, thick
insulations, etc. Therefore, a set detection depth cannot be specified.
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