The internal structure of the test pencil and the risks associated with test pencil injury
What will happen to the live cable if the test pen's resistance breaks? The likelihood of this electric shock is fairly high because it will lead to live operation and judgment errors whether it results from an open circuit or a reduction in internal resistance.
The test pen's interior structure
The conventional electric measuring pen has a very straightforward design. Neon lights, hinges, caps, and high-resistance resistors make up its components. When there is low voltage, neon bulbs do not produce illumination. Usually, they can only light up when the voltage is greater than 100v. If they are not abused, it is hard to harm them.
High-resistance resistors come in different resistance values. Though the demand can theoretically be met by more than 500k ohms, we anticipate that the greater the resistance value, the better. It will be open because it is obvious that it cannot be endless. The electric pen needs to be checked and kept frequently in case we make a mistake.
What occurs then if the electric pen's impedance is less than the desired level? When the electric pen comes in contact with an energized body, the human body is obviously vulnerable to electric shock. I think everyone can learn from this, particularly electricians.
The potential for test pen harm
Because of the infinite resistance, we may mistakenly believe that an electrical appliance is devoid of electricity and that electric shock during repair operations poses a serious risk to the person.
When measuring a charged body, an electric measuring pen with a resistance lower than 500k ohms will cause individuals to feel numb. Lower resistance is comparable to touching a live wire with one's hand, and the results could be fatal.
Summarize
When purchasing the electric test pen, you can take a multimeter to check the resistance value of the internal resistance. Generally, it is above the MΩ level, indicating that the quality is excellent and can be used for a long time.
