Transmitter is a parameter to be measured (current, voltage, active power, reactive power, active power, reactive power, frequency, phase, power factor, DC voltage, DC current) conversion according to the linear proportional DC current or voltage (pulse output energy) measurement instrument. It is widely used in electric power, petroleum, coal, metallurgy, railway, municipal government and other departments of the electrical measurement, automatic control and scheduling system. The analog signal transmitter output current new international standard value of 4 ~ two 20mA loop wire in the transmit data and control those of some actuators easy to accept instructions in this standard has been widely used in the process. The only standard of current telemetry in the analog signal. The utility model is characterized in that the working power supply and the indicating device of the transmitter are connected in series in the circuit.