How to use and precautions for induction test pen
I believe that many people have checked the electrical wiring or electricity meters in their homes, and a commonly used electrician's tool such as an induction pen is indispensable. A test pen, also often called a test pen, is a small tool used to test whether there is electricity in the wire. Its usage rate is very high and its use occasions are also very wide. There are many types of electric test pens, so do you know how to use induction test pens?
How to use the induction test pen
Commonly used low-voltage test pens, master the two-grip test method. A pen-like voltage tester that presses the metal clip with the palm of your hand. Use your thumb, index finger and middle finger to hold the middle of the pen holder. A rotary chisel type electric test pen, press the metal cap on the tail with your index finger. Use your thumb, middle finger and ring finger to pinch the middle of the plastic rod. The small window of the neon tube is backlit, so you can observe when you face it.
Precautions for using induction test pen
1. Before using the test pen, first check whether there is a safety resistor in the test pen, and then visually check whether the test pen is damaged, whether it is affected by moisture or water, and it can only be used after passing the inspection.
Principle: There is a resistor inside the test pen, and there is a luminous body - a neon tube. The key is the neon tube. After the resistor reduces the voltage, there is voltage to one end of the neon tube, forming a high potential. Your hand needs to touch the metal end of the tail of the pen , now you are the ground wire. There are two sections of thin metal wires in the neon tube, which are very close but not connected. The neon tube is naturally filled with neon gas. With a suitable potential difference, glow can be produced. Discharge. If the voltage is too high, the neon tube will instantly break down. At this time, the neon tube will act as an insurance and will not cause too much harm to you. Low voltage will be more dangerous, because traditional electric pens, that is, neon tube electric pens, only need to be above about 100V. It will light up, don't be careless, and don't let water get into the pen, otherwise you will know the feeling of electric shock.
2. When using the test pen, do not touch the metal probe on the front of the test pen with your hands. Doing so may cause personal electric shock.
3. When using the test pen, be sure to touch the metal part at the end of the test pen with your hand. Otherwise, because there is no circuit between the charged object, the test pen, the human body and the earth, the neon bulb in the test pen will not emit light, causing misjudgment. Charged objects are not charged, which is very dangerous.
4. Before measuring whether the electrical equipment is charged, first find a known power source to test whether the neon bulb of the test pen can emit light normally before it can be used.
5. When testing charged objects under bright light, special attention should be paid to whether the neon bulb really emits light (or does not emit light). If necessary, you can use your other hand to block the light and judge carefully. Do not misjudge the neon bulbs by misjudging them as glowing or non-luminous, and judging the presence of electricity as non-electricity.
