1 frequency transmitter will amplify the frequency signal of various waveforms such as square wave, sine wave and so on after isolation and shaping, and then send it to the standard analog signal of isolation output. It can be used in conjunction with DCS, PLC and other systems to provide on-site instrument signal isolation, conversion processing, etc., thereby improving the anti-interference ability of the automatic control system for industrial production processes and ensuring the stability and reliability of the system.