J) Contact-Free Ac Voltage Recognition (Ncv) - VOLTCRAFT VC275TRMS Bedienungsanleitung

After measuring, remove the sensor and turn off the DMM.
If no temperature sensor is connected, the ambient temperature of the DMM can be displayed via a short-
circuit jumper across the two measuring sockets "COM" and "°C". Since the sensor is inside the housing, the
display will react to temperature fluctuations very slowly. This function helps you control the correct operating
temperature after storage. For quick measurements, an external sensor must be used.

j) Contact-Free AC Voltage Recognition (NCV)

This function is not admissible to determine voltage freeness in electrical systems. For this, a
2-pole contact 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 (19) is attached at the front of the meter.
A possible alternating voltage is displayed acoustically and with 4
bars in the display. The sound sequence and the number of bars
increases with increasing voltage. The display shows the letter
abbreviation "EF" for "electromagnetic field" without voltage
detection.
- Remove all measuring lines from the meter. This function needs
no measuring lines.
- Turn the DMM on and select measuring function "NCV".
- Move the meter with the front to a known AC voltage source.
Always perform this test to avoid wrong detection. The meter
starts to beep if there is an alternating voltage.
- Perform the test at the intended line, etc.
- Switch off DMM after completing the test.
The highly sensitive NCV sensor may also cause a voltage
recognition at static charge. This is normal and not a
malfunction.
46