Three phase voltage meter is the voltage parameter measurement of three-phase electricity, is generally used in high voltage power distribution cabinet and the low-voltage cabinet. Units with V (volt), Chinese volts. Use the analog / digital converter will measure the voltage value is converted into digital form and in the form of digital representation of the instrument is suitable for the environment temperature is 0 ~ 50 ℃ humidity below 85%, due to the magnetic field or in high frequency instrument, high voltage sparks, lightning causes voltage is abnormal, the external use the power line filters or nonlinear resistor interference absorption circuit.