The method of measuring the zero line of the live wire with the electric pen is: hold the electric pen with the big finger and the middle finger, press the index finger on the pen cap or pen hanger (do not touch the metal pen head on the head to prevent electric shock), and use the electric pen tip to touch the wires respectively. When the light is on, it is the live wire, otherwise it is the neutral wire or the ground wire.
However, the live wire is not necessarily the live wire. In the event of a fault, the neutral wire or the ground wire may be live, but the live wire may not be live. Therefore, it is recommended that unprofessional people turn to professional electricians when encountering such problems to ensure the safety of personal facilities and the smooth solution of the problem.
In addition to being mainly used to check low-voltage electrical equipment and lines, the low-voltage electroscope can also distinguish between phase lines and zero lines, alternating current and direct current, and voltage levels.
When distinguishing the zero line and the live line, usually the neon bulb glows as the live line, and the one that does not light up is the zero line; but pay attention when the neutral point is displaced, at this time, the zero line will also make the neon bubble glow;
When distinguishing between alternating current and direct current, when alternating current passes through the neon bulb, both poles of the neon bulb emit light, and when direct current passes through, only one electrode is illuminated near it;
When used to judge the voltage level, when the neon bulb is dark red and slightly bright, the voltage is low; the neon bulb turns yellow and red, and the voltage is high when the brightness is strong.
