How to accurately use a measuring pen
The purpose of measuring electric pens
(1) It can be used for low-voltage core phase measurement to determine whether any wires in a circuit are in phase or out of phase. The detailed method is to stand on an object insulated from the ground, hold a measuring pen in each hand, and then walk through the two wires to be tested for inspection. Assuming that the two measuring pens emit very bright light, then these two wires are out of phase; On the contrary, it is in phase, which is based on the principle that the voltage difference between the north and south poles of the neon bubble in the measuring pen is proportional to its luminous intensity.
(2) Can be used for differential communication between electricity and direct current. When using a stylus for verification, it is assumed that both poles in the neon bubble of the stylus emit light, indicating communication electricity; Assuming that only one of the two poles needs to emit light, it is a direct current.
(3) Capable of distinguishing between positive and negative electrodes of direct current. Connect the test pen to the DC circuit for verification. The electrode with the neon bubble shining is the negative electrode, and the electrode without the neon bubble shining is the positive electrode.
(4) Can be used to differentiate whether DC is grounded or not. In a DC system with insulation to ground, one can stand on the ground and touch the positive or negative pole of the DC system with a measuring pen. Assuming that the neon bubble of the measuring pen is not bright, there is no grounding phenomenon. Assuming that the neon bubble shines, it indicates a grounding phenomenon, and if it shines at the top of the pen, it indicates a positive grounding. If it shines on the finger end, it is negative grounding. However, it is necessary to point out that in DC systems with grounding monitoring relays, this method cannot be used to determine whether the DC system is grounded or not.
How to accurately use a measuring pen:
① Before checking whether the electrical appliances and lines are live or not, try on the electrified ground first to see whether the measuring pen is intact, so as to prevent electric shock due to difference error.
② When holding the pen, press the tail of the measuring pen with your fingers, and hold the pen body with other fingers.
③ When measuring electricity, the pen tip touches the test body and the hand touches the tail of the measuring pen. Assuming that 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 inspection body is not charged.
④ If the insulation resistance of the measuring pen is less than 1 megohm, it cannot be used.
