Power transmitter is a measurement of both active / reactive power, but also measure active / reactive power meter has a dual function. Is energy metering, energy-saving automation and computer support electricity billing meters, this series of instruments technical indicators in full compliance JJG596-89 "electronic meter" requirement, the relative error is less than 0.5% of the power display recording device is used to power hopping systems ideal for electronic meter. The transmitter for the frequency of 50Hz, 60Hz single special frequency, three-phase line, with 4 ~ 20mADC output power, power to optocoupler or open collector pulse output pulse output relay passive contact form to apply different and RTU recording apparatus and power requirements. Glossary power transmitter (Power transmitter), is an input voltage and current signal is converted into active power, reactive power, power factor and other parameters into a standard output of a fixed function, to facilitate the use of secondary equipment measuring means. According to the output of a standard amount of analog or digital outputs can be divided into analog and digital power transmitter output power of the transmitter. In general, the output power of the transmitter analog output only as a parameter or active power factor, etc., and the digital output of the transmitter can output the required voltage, current, frequency, active power, power factor, harmonic wave and other parameters. For analog output power of the transmitter, the first converter output and the measured parameters into an analog signal, the transmission system as a function of the cable, the analog signal is connected to the transmission system and the secondary instrument. For digital output power of the transmitter, the other information, a transmission system with an input converter output voltage, a current proportional to the instantaneous value of the signal digitally coded signal and the operation may be required cable, fiber or wireless system. Digitally encoded signal transmission system through secondary instruments and digital inputs connected to the second instrument for digital processing, is able to obtain all the parameters related to the circuit under test: True RMS voltage and current, fundamental RMS, the fundamental frequency, the fundamental active power, total active power, voltage harmonics, harmonic currents and harmonic power.