Electric Tools-Test Pencil

Measuring pen definition123

An electrical tool used to test electrical wiring for electrical power.

Measuring pen working principle

When measuring the live wire, there is a voltage U=220V between the live wire and the ground, and the resistance inside the measuring pen is usually about several megaohms. The current through the measuring pen (that is, the current through the human body) is very small, usually less than 1 mA. When such a small current passes through the human body, it will not hurt people, and when such a small current passes through the neon bubble of the measuring pen, the neon bubble will glow.

Measuring pen classification

• High voltage measuring pen

• Low voltage measuring pen

• Vulnerability test pencil

Measuring the use of the pen

• Determine if the object is charged

• Determine whether the wires are in phase or out of phase

• Distinguish alternating current from direct current

• Determine the positive and negative poles of direct current

• Check whether DC is grounded