Low-voltage test pens are generally suitable for AC and DC voltages.

The low-voltage test pen is suitable for testing AC voltage below 500V, and can test DC voltage of1.0 V ~ 400 V. ..

Electroscope, commonly known as electric pen, is a commonly used electrical tool. It can be used to judge the neutral line and live line in household lighting circuits, and it can also be used to judge whether there is leakage in household appliances.

The electric pen judges AC and DC, AC is bright and DC is dark, AC neon tube is bright, and one end of DC neon tube is bright.

Extended data:

Other uses of the test pen

1. Any wire in the measuring circuit is in phase or out of phase.

Stand on an object insulated from the earth, hold a test pen in each hand, and then test it on two wires to be tested. If both test pens are bright, it means that the two wires are out of phase, otherwise they are in phase.

2. Judge the positive and negative poles of direct current.

Connected to DC circuit, it is found that the bright electrode of neon tube is negative electrode and the unlit electrode is positive electrode.

3. Judge whether the power supply is grounded.

DC coefficient of substation, the electric pen does not glow when touched; If the lamp is close to the pen tip, the positive electrode has a grounding fault; If the lamp is close to the finger end, the grounding fault is at the negative pole.

References:

Baidu encyclopedia-measuring pen