Precautions for using induction tester
Instructions for using an induction measuring pen
Commonly used low-voltage measuring pens, master the two grip method for testing. A pen style electric measuring pen, with the palm touching the metal clip. Pinch the middle of the electric pen rod with your thumb, index finger, and middle finger. A rotary chisel type measuring pen, with the index finger pressing the metal cap at the end. Pinch the middle part of the plastic rod tightly with the thumb, middle finger, and ring finger. Neon tube small window backlight, facing towards oneself for easy observation.
Precautions for using induction measuring pens
1. Before using the test pen, it is necessary to first check whether there is a safety resistor inside the test pen, and then visually inspect whether the test pen is damaged, damp, or waterlogged. Only after passing the inspection can it be used.
Principle: There is a resistor and a luminous body inside the test pen - a neon tube. The key is the neon tube. After the resistor is reduced in voltage, a voltage is applied to one end of the neon tube, forming a high potential. Your hand needs to touch the metal end at the end of the pen, and now you are the ground wire. There are two thin metal wires in the neon tube, which are very close but not connected. The neon tube is naturally filled with neon gas, and with a suitable potential difference, glow discharge can be generated. If the voltage is too high, it will instantly break through the neon tube. At this time, the neon tube serves as a safety measure and will not cause too much harm to you. Low voltage can be more dangerous because traditional electric pens, also known as neon tube electric pens, only light up at around 100V or above. Be careful not to let water enter the pen, 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 hand, as doing so may 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 ground, the neon bubbles in the test pen will not emit light, causing a misjudgment that the charged body is not charged. This is very dangerous.
4. Before measuring whether electrical equipment is charged, it is necessary to find a known power source to test whether the neon bulb of the test pen can emit light normally. Only when it can emit light normally can it be used.
5. When testing charged bodies under bright light, special attention should be paid to whether neon bubbles really emit light (or not), and if necessary, the other hand can be used to carefully distinguish by blocking the light. Do not make a mistake by judging neon bubbles as not emitting light when they are emitting light, and as having electricity when they are not.
