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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 elec-
trical conductors. The NCV sensor (1) is at-
tached at the front of the meter.
A possible alternating voltage is displayed vis-
ually and acoustically. The display will show
the signal strength by one to four dashes. An
acoustic signal will move from a beep to a per-
manent sound.
- Turn the DMM on and push the button “V”.
- Move the current probe with the front to a
known AC voltage source. Always perform
this test to avoid wrong detection. The meter
starts to beep at alternating voltage and
displays the signal strength.
- Perform the test at the intended line, etc.
- Remove the current probe from the object to be measured after completion of
the measurement and switch off the device.
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.
