The usage method and precautions of induction test pen
Usage of induction test pen
Commonly used low-voltage test pen, master the two grip method for testing. A pen style measuring pen with the palm touching the metal clip. Pinch the middle part of the electric pen holder with your thumb, index finger, and middle finger. A rotary chisel style measuring pen with a metal cap at the end of the index finger. Pinch the middle part of the plastic rod tightly with the middle finger of the thumb and ring finger. The neon tube has a small window backlight and can be observed when facing oneself.
Precautions for using induction test pens
1. Before using the test pen, first check if there is a safety resistor inside the test pen, and then visually inspect if there is any damage, moisture or water ingress to the test pen. Only after passing the inspection can it be used.
Principle: There is a resistance inside the test pen, and there is a luminous element - a neon tube. The key lies in the neon tube. After the resistance is reduced, a voltage is applied to one end of the neon tube, forming a high potential. Your hand needs to contact the metal end of the end of the pen, and now you are the ground wire. There are two thin metal wires in the neon tube, which are close but not connected. The neon tube is naturally filled with neon gas, and a suitable potential difference can produce glow discharge. If the voltage is too high, it will instantly break through the neon tube. At this time, the neon tube acts as a safety device and will not cause too much harm to you. A low voltage can be more dangerous because traditional electric pens, such as neon tube electric pens, only light up at around 100V or above, so be careful. Also, do not let the electric pen get wet, otherwise you will know the feeling of electric shock.
2. When using a test pen, do not touch the metal probe at the front end of the test pen with your hands, as this can cause personal electric shock accidents.
3. When using a test pen, be sure to touch the metal part at the end of the test pen with your hand. Otherwise, due to the lack of a circuit between the charged body, the test pen, the human body, and the earth, the neon bubbles in the test pen will not emit light, causing misjudgment and believing that the charged body is not charged, which is very dangerous.
4. Before measuring whether electrical equipment is live, it is necessary to find a known power source to test whether the neon bulb of the pen can emit light normally, and can emit light normally before use.
5. When testing charged objects under bright light, special attention should be paid to whether the neon bubble truly emits light (or does not emit light), and if necessary, the other hand can be used to block the light and carefully distinguish. Never make a misjudgment by judging neon bubbles as not emitting light and judging them as having electricity as not.
