Do you know that the electric test pen has these functions in addition to electric measurement?
1) First of all, the electric pen can be used for low-voltage phase verification to measure whether any wires in the line are in phase or out of phase. Its discriminative principle is that the voltage difference between the two poles of the neon bulb in the electric pen is proportional to its luminous intensity. The specific operation method is: the operator should stand on an object that is insulated from the ground, and take two test leads to test on the two wires to be tested. If the two test leads glow brightly, then the two wires are out-of-phase; otherwise, in-phase.
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(2) Secondly, the test pen can also be used to distinguish between alternating current and direct current. During the test, if both poles in the neon bulb of the test pen glow, it is alternating current; if only one pole glows, it is direct current.
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(3) In addition, the electric test pen can also judge the positive and negative poles of the direct current. Connect the test pen to the DC circuit. If the neon bulb lights up, that pole is the negative pole, and if it does not light up, it is the positive pole.
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(4) In addition, the test pen has another function that can be used to judge whether the DC is grounded or not. In a ground-insulated DC system, the operator can stand on the ground and touch the positive or negative pole of the DC system with a test pen. If the neon bulb does not light up, it means that there is no grounding phenomenon. If it lights up, it means there is a grounding phenomenon. If the tip of the pen lights up, it means the positive terminal is grounded; if the tip of the finger lights up, it means the negative terminal is grounded. However, it should be noted that this method cannot be used in DC systems with ground monitoring relays.
