How to use the test pen? Correct use of the test pencil
The electrician's most familiar tool is the electric pen, which is used to determine whether an object is charged or not.
Its interior is made of a neon bubble with two electrodes. The neon bubble is filled with the inert gas neon, and when the neon bubble has a voltage, it will emit light.
One pole is connected to the tip of the pen, and the other pole is connected to the other end of the pen with a high resistance in series.
When the voltage between the two poles of the neon bubble reaches a certain value, a glow is generated between the two poles, and the intensity of the glow is proportional to the voltage between the two poles.
When the voltage of the charged body to the ground is greater than the glow voltage of the neon bulb, and the tip of the test pen touches it, the other end is grounded through the human body, so the test pen will emit light.
The function of the resistance in the test pen is to limit the current and keep the current within a safe range to avoid danger.
Note that the resistance of the electric pens on the market is generally small, so sometimes there is a slight feeling when measuring electricity. Those with strong hands-on ability can change this resistance to 1.5M.
Instructions:
Touch one end of the cap of the electric pen with your hand, and the other end touches the object to be measured. If the window of the electric pen turns red, it means that the object to be measured is charged.
