How to use the induction test pen and precautions
I believe that many people have checked their own home wiring lines or meters, then there must be less induction stylus this common electrician's tools. The stylus, also called a test pen, is a small tool to test whether the wires are electrically charged. It is highly used in a wide range of applications. There are many types of stylus, so do you know how to use the induction stylus?
How to use the inductive stylus
Commonly used low-voltage stylus, mastering the test two grip method. Pen type stylus, palm touching the metal clip. Thumb index finger and middle finger, pinch the middle of the pen rod. Rotary chisel type of stylus, index finger press the end of the metal cap. Thumb middle finger ring finger, pinch the middle of the plastic rod. Neon tube small window backlit, towards their own will observe.
Notes on the use of the inductive stylus
1, before using the test pen, first check the test pen with or without safety resistors, and then intuitively check the test pen whether there is damage, there is no moisture or water, after passing the inspection can be used.
Principle: test pen with resistance, there is a luminous body - neon tube, the key to the neon tube, after the resistor voltage reduction, there is a voltage to one end of the neon tube, the formation of a high potential, your hand needs to touch the end of the metal end of the electric pen, and now you are the ground, in the neon tube there are two sections of thin wire, close to each other, but not even, neon tube is naturally filled with neon gas, there is a suitable potential difference can be generated by the glow discharge. If the voltage is too large, it will instantly break through the neon tube, then the neon tube plays the role of insurance, will not produce too much harm to you, the low voltage will be more dangerous, because the traditional electric pen, that is, neon tube pen, in about 100V or so before it will be bright, carelessness should not be, in addition to the pen do not get into the water, or you will know how it feels to be electrocuted.
2, the use of test pens, can not touch the front end of the test pen metal probe, this will cause personal electric shock accident.
3 When using the test pen, be sure to use your hand to touch the metal part of the end of the test pen, otherwise, because the charged body, the test pen, the human body and the earth does not form a circuit, the neon bubble in the test pen will not glow, resulting in a misjudgment, that the charged body is not electrically charged, which is very dangerous.
4, in the measurement of electrical equipment is charged before, first to find a known power test a test pen neon bubble can be normal light, can be normal light, in order to use.
5, in the bright light test charged body, should pay special attention to whether the neon bubble really light (or not), if necessary, the other hand can be used to block the light to carefully identify. Do not cause a misjudgment, the neon bubble light for the judgement of non-glow, and will have the power to judge for no power.
