What is the structure of the test pen and how much voltage can be measured
1. What is the structure of the test pen?
The electric test pen is one of the necessary tools for electricians. It is used to measure whether the conductor is charged. It is mainly used to check whether the electrical circuit and electrical equipment are charged. Here is the structure of the electric test pen. Let's take a look!
The structure of the electric test pen is generally composed of touching electrodes, resistors, neon bulbs, springs and metal end caps (hand touch poles). For the digital type, there are also display screens, indicator lights, electricity test time keys and power-off test keys.
In addition, there are many appearances of the electric test pen, such as the shape of a screwdriver, but it cannot be used as a screwdriver, and it cannot be used to tighten screws or remove screws. There are also some new types of test pens, like digital ones, which can not only observe whether the wire has electricity, but also measure the value of the voltage. In addition, the electric measuring pen used by some electrician friends is inductive, which is very convenient to use. There are many types of test pencils, which increase the choice of electricians.
2. How much voltage can the test pen measure?
1. The measuring voltage range of ordinary test pens is between 60V- -500V. When it is lower than 60 volts, the neon tube of the test pen may not emit light. If it is higher than 500 volts, ordinary test pens cannot be used to measure, otherwise it is easy to cause personal electric shock.
2. When using, pay attention that your fingers must touch the metal pen hanger (pen type) or the metal screw on the top of the test pen (screwdriver type), so that the current is formed by the charged body under test, the test pen, the human body and the earth. As long as the voltage between the charged body under test and the ground exceeds 60V, the neon tube will start to glow, and the backlight of the neon tube window C should face the operator when observing
