Other uses of the Voltage tester pen
In addition to judging whether an object is charged, the Voltage tester pen has other uses. Let's take a look.
1. Carry out low-voltage phase verification, and measure whether any wires in the line are in phase or out of phase.
method:
Stand on an object insulated from the earth, hold a tester pen in each hand, and then test on the two wires to be tested. If the two test pencils glow brightly, the two wires are out of phase; otherwise, It is in the same phase, which is determined by the principle that the voltage difference between the two poles of the neon bulb in the test pen is proportional to its luminous intensity.
2. It is used to distinguish between alternating current and direct current.
When testing with a test pen, if both poles in the neon bulb of the test pen glow, it is alternating current; if only one of the two poles glows, it is direct current.
3. Determine the positive and negative poles of direct current.
Connect the test pen to the DC circuit to test, the neon bulb that glows is the negative pole, and the non-lighting pole is the positive pole.
4. It is used to judge whether the DC is grounded.
In a DC system insulated to the ground, you can stand on the ground and use a test pen to contact the positive or negative pole in the DC system. If the neon bulb of the test pen does not light up, there is no grounding phenomenon.
If the neon bulb is bright, it means that there is a grounding phenomenon, and if the neon bulb is bright, it means that the positive electrode is grounded. If it shines on the finger end, it is the negative ground.
Note that in a DC system with a ground monitoring relay, this method cannot be used to determine whether the DC system is grounded.
