How to measure the voltage of three-phase electricity with a multimeter
1. Adjust the knob of the multimeter to V~ and point to 750V (this level does not have to be 750, greater than 380 can be).
2. Insert one end of the red and black stylus into the com and VΩmA sockets of the multimeter respectively, the black stylus into the com socket and the red stylus into the VΩmA socket.
3. Open the multimeter, the other end of the two stylus and the line to be measured in contact (Note: three-phase electricity between each fire wire and zero line voltage is 220V, the voltage between the two fire wire is 380V)
4. The final reading displayed on the screen is the voltage value to be measured.
General three-phase 10 kV high-voltage power after transformer step-down to obtain three-phase five-wire system (three fire, 1 zero, 1 ground) power.
If the owner only need to measure the voltage of the three-phase power, then it is very simple ah, with an AC voltmeter or multimeter AC file of the red and black pens were two by two with any two of the three-phase power connected to the readings should be in the range of 380V ± 5%.
That is to say, the voltage between A and B is about 380V, the voltage between B and C is also about 380V, the above two data if they are correct, then the voltage between phase A and phase C must also be 380V.
Multimeter how to measure three-phase electricity 380V voltage
1. the knob of the multimeter to V ~ file, and point to 750V (this file is not necessarily 750, greater than 380 can be).
2. Insert one end of the red and black stylus into the com and VΩmA sockets of the multimeter, the black stylus into the com socket and the red stylus into the VΩmA socket.
3. Open the multimeter, the other end of the two stylus and the line to be measured in contact (Note: three-phase electricity between each fire wire and zero line voltage is 220V, the voltage between the two fire wire is 380V)
4. The last reading displayed on the screen is the voltage value to be measured.
Multimeter, also known as multipurpose meter, multi-purpose meter, triple meter, traditional meter, etc., is an indispensable measuring instrument in power electronics and other sectors, generally to measure voltage, current and resistance as the main purpose. Multimeter is divided into pointer multimeter and digital multimeter according to the display mode. It is a multifunctional, multi-range measuring instrument, generally the multimeter can measure DC current, DC voltage, AC current, AC voltage, resistance and audio level, etc. Some can also measure AC current, capacitance, inductance and some parameters of semiconductors (e.g., β) and so on.
