Detailed Introduction To The Functions Of The Three Voltage Detector.
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The test pencil is also called the test pencil, referred to as "electric pen", which is an electrical tool used to test whether the wire is charged. There is a neon bulb in the pen body. If the neon bulb glows during the test, it means that the wire has electricity or is the live wire of the passage. The nib and tail of the test pen are made of metal materials, and the pen holder is made of insulating material. The low-voltage test pen is used for the detection of charged objects with a line voltage of 500V and below.
The structure of the traditional test pen
Operating principle
The electric test pen is composed of a metal body at the pen tip, a resistor, a neon tube, a pen body, a small window, a spring and a metal body at the end of the pen.
When the electric test pen tests the electrified body, as long as the electrified body, the electric pen, the human body, and the earth form a path, and the potential difference between the electrified body and the earth exceeds a certain value (for example, 70 volts), the neon tube in the electric test pen will emit light ( Whether its potential is AC or DC), this tells people that the measured object is charged and exceeds a certain voltage intensity.
Digital test pen
This is also a kind of electric test pen, which belongs to electrical and electronic tools. It is used to test whether the wire is charged. The digital display test pen has an LED display, which can intuitively read the test voltage number.
Operating principle
When measuring the fire wire, the lighting circuit has a voltage of about U=220V between the fire wire and the ground. The current (that is, the current passing through the human body) is very small, usually less than 1 milliampere. When such a small current passes through the human body, it will not harm people, and when such a small current passes through the neon bulb of the test pen, the neon bulb will emit light. .
Intelligent sensor test pen
The induction test pen is a non-contact test pen, such as the YW-322 measured by Yuwen, which has its own flashlight light source, AC voltage 12-1000V, frequency 50Hz-60Hz, and the test pen will have a constant voltage when it senses the AC voltage. Continuous sound and LED flashing prompts, not only can detect bare wires, but also can detect whether the wires buried under the tiles have electricity, and can automatically identify neutral wires and live wires.
