What is the principle of the electric pen? What does the pen display showing 12v mean?
Do you know the principle of an electric pen, which is an auxiliary safety tool used to detect whether low voltage conductors and electrical equipment casings are live or to distinguish between live and neutral wires of a power supply?
A low-voltage voltage tester is a tool used by electricians to check whether wires, electrical appliances, and electrical equipment are charged. It mainly consists of a pen tip, a neon bulb, a voltage reducing resistor, a spring, and other components. When current passes through the tested electrical device, the human body, and the ground to form a circuit, its leakage current causes neon bubbles to emit light and work.
The principle is Ohm's Law. When the potential difference between a charged body and the earth exceeds a certain value, neon bubbles will emit light. If it is below a certain value, it will not emit light, thus determining whether low-voltage electrical equipment is charged.
What does the pen display 12v mean
Many people like to use an electric pen to test the voltage value, but it is best not to use this type of pen for testing as it may cause some errors. Now let me introduce to you what it means to display 12v on an electric pen.
1. The pen displays 12v, which is not a leakage.
2. It refers to the voltage value of a certain area of the product being measured being 12v, but try not to use this number to display the test pen as it can easily mislead the user.
3. In addition, when using, be sure to touch the metal part at the end of the test pen with your hand, otherwise the tested data will be inaccurate.
