The three-phase AC voltage transmitter is an instrument that simultaneously isolates and amplifies three-phase measured AC signals and converts them into a DC voltage or current that is linearly proportional to the input voltage. It is widely used in power systems and non-electricity. In the system, it can run continuously for a long time to realize the measurement of AC current. This series of products has high measurement accuracy, good conversion linearity, and lightning protection. Among them, the true RMS measurement transmitter and the distortion waveform of the input signal do not affect the measurement accuracy of the instrument.