NCV non-contact test pencil
"NCV" is the abbreviation of Non contact voltage, which means "non-contact voltage detection", which is used to judge whether the object under test is charged, that is, to detect whether the wire has electricity (live wire) without breaking the wire skin or touching the electrode. The NCV non-contact test pen uses electromagnetic field induction detection technology to realize non-contact detection of whether an object is charged. It can be used to find live wires buried in the wall, or to find buried broken wires, etc., suitable for higher AC voltage. It only judges whether there is voltage or not, and cannot measure the level of specific voltage.
Usually, the NCV non-contact electric test pen can also be used to distinguish the neutral and live wires of the socket. When the live wire is detected, there will be an audible and visual alarm, and there will be no audible and visual alarm when the neutral wire is detected.
working principle
The NCV non-contact electric pen uses induction detection technology to realize non-contact detection of whether the object is charged, and uses the metal induction sheet to detect the electromagnetic field non-contact, through the signal processing circuit, the electromagnetic field signal is converted into a voltage signal, and finally the voltage signal is processed by the single-chip computer. Judging the magnitude of the induced voltage to judge the strength of the electromagnetic field, and then judge whether there is alternating current and the strength of alternating current.
The specific working process, such as Huashengchang AC-15EX/AC-15EXS explosion-proof NCV non-contact test pencil:
When the NCV non-contact electric test pen is in the 100~1000VAC high voltage range mode, its sensing pen tip is close to the AC voltage source to be tested. If an AC voltage within the range is detected, the green light is off, the red light is on, and the buzzer makes a fast sound. , the motor vibrates when the buzzer sounds.
When in the 12~1000VAC low voltage range mode, after the test pen is turned on, press and hold the 12V range button, the green light is off, and the yellow light is on, indicating that the test pen is working in the 12~1000VAC range. At this time, let the tip of the test pen approach the AC to be tested Voltage source, when the AC voltage within the measuring range is detected, the yellow light goes out, the red light flashes slowly, the red light is accompanied by a buzzer, the motor vibrates, and the speed of the red light flashes increases with the sensed AC voltage. Stronger, the faster the blinking speed, when the sensed AC voltage reaches the high voltage range, it will automatically switch to the high voltage range mode.
