The 8 major functions of voltage testers
1. Judge whether the electrical contact is good: When measuring the electrical circuit with a measuring pen, if the neon tube flashes and the brightness is unstable, it indicates that there is a phenomenon of poor contact in the electrical circuit.
2. Judge the voltage level: The higher the voltage detected by the measuring pen, the brighter the neon tube. If the brightness of the measuring pen neon tube is different when detecting different voltages, it can be preliminarily determined that the brightness is dark and the voltage is low; Brightness and high voltage.
3. Judgment is induced electricity: If a general measuring pen is used to measure a long three-phase circuit, even if one phase of the three-phase AC power supply is missing, the low-voltage measuring pen neon tube will still light up during detection, making it difficult to make a judgment. If a low voltage measuring pen is used and connected to a 1500 picosecond small capacitor with a voltage resistance greater than 250 volts, it can be determined which phase is missing: measure the live line, and the neon tube of the measuring pen emits normal light; Measure the phase loss circuit, and measure whether the neon tube of the electric pen is slightly bright or not emitting light.
4. Judging between AC and DC: If only one pole in the neon tube is lit when a measuring pen can be used for measurement, it indicates that it is DC. If both poles in the neon tube light up at the same time, it indicates alternating current.
5. To determine whether the AC power supply is in phase or out of phase: first, hold a low-voltage measuring pen in each hand, and then stand on an insulating platform, wooden stool, or other insulating object. Then, touch both measuring pens simultaneously with the two wires to be tested, and carefully observe the neon tube emission of the measuring pens. The neon tube emission of the two measuring pens is very bright, indicating that the two wires are out of phase; The neon tubes of two measuring pens do not emit too much light, indicating that the two wires are in phase.
6. Judging zero line open circuit: A zero line open circuit can also be detected and judged using a measuring pen: first, connect one end of the measuring pen to the zero line, and then connect the other end to the ground wire. When the neon tube of the measuring pen lights up, it indicates that the zero line is open circuit.
Judging whether an object is generating static electricity: Hold a measuring pen and search around the object to be judged. If the neon tube of the measuring pen lights up, it indicates that there is static electricity on the object to be judged.
7. Judging DC grounding, positive electrode grounding, and negative electrode grounding: When a person is standing on the ground, use a measuring pen to contact DC power, and then judge based on the status of the measuring pen: If the neon tube of the measuring pen is lit, it indicates that there is grounding phenomenon in the DC power; If the neon tube of the measuring pen does not light up, it indicates that there is no direct current grounding; If one pole at the tip of the test pen is lit, it indicates that the direct current is grounded to the positive pole; If one pole of the pen in hand is lit, it indicates that the DC current is grounded to the negative electrode.
8. To determine whether the AC power supply is in phase or out of phase: first, hold a low-voltage measuring pen in each hand, and then stand on an insulating platform, wooden stool, or other insulating object. Then, touch both measuring pens simultaneously with the two wires to be tested, and carefully observe the neon tube emission of the measuring pens. The neon tube emission of the two measuring pens is very bright, indicating that the two wires are out of phase; The neon tubes of two measuring pens do not emit too much light, indicating that the two wires are in phase.
