Input frequency signal, and output current / voltage / 1: 1 frequency signal. Power can be supplied to a field meter.The three terminals input end, output end and the power end are photoelectrically isolated. It can be used with various types of instruments and DCS, PLC and other equipment with the advantage of fast response, low power consumption, and good temperature characteristics. It was widely used in major projects in the petroleum, petrochemical, manufacturing, power, metallurgy and other industries.