In addition to testing whether there is electricity, the electric tester has the following uses:
1. It can be used for low-voltage phase detection to measure whether any wires in the circuit are in phase or out of phase. The specific method is to stand on an object insulated from the ground, hold a measuring pen in each hand, and then test on the two wires to be tested. If the two measuring pens light up very brightly, then these two wires are out of phase; On the contrary, it is in phase, which is determined by the principle that the voltage difference between the two poles of the neon bubble in the measuring pen is proportional to its luminescence intensity.
2. Can be used to distinguish between alternating current and direct current. When testing with a test pen, if both poles in the neon bubble of the test pen emit light, it is AC power; If only one of the two poles emits light, it is direct current.
3. Can determine the positive and negative poles of direct current. Connect the measuring pen to a DC circuit for testing. The positive pole of the neon bubble is the one that lights up, and the one that does not light up is the positive pole.
4. Can be used to determine whether the DC is grounded. In a DC system with ground insulation, one can stand on the ground and use a measuring pen to contact the positive or negative pole of the DC system. If the neon bulb of the measuring pen does not light up, there is no grounding phenomenon. If the neon bubble lights up, it indicates that there is a grounding phenomenon. If it lights up like in a pen, it indicates that the positive electrode is grounded. If it lights up on the finger end, it is negative ground. However, it must be pointed out that in DC systems with grounding monitoring relays, this method cannot be used to determine whether the DC system has been grounded.
How to use a measuring pen:
1. Before testing whether electrical appliances and circuits are live, it is necessary to first test on a live ground to see if the measuring pen is intact, in order to prevent misjudgment and electric shock.
2. When holding the pen, press down on the tail of the measuring pen with your fingers, and hold the pen body with the remaining fingers.
3. When measuring electricity, the pen tip touches the test body and the hand touches the tail of the measuring pen. If the test body is charged, the neon tube of the measuring pen will emit light; If the neon tube does not emit light, it indicates that the test object is not charged.
4. The insulation voltage of the measuring pen is less than 1 megohm and cannot be used.
