The use of micro-power consumption of the apparatus a high level of integration of high-speed embedded processors. The use of high-energy three 5 # alkaline dry batteries or 5 # rechargeable batteries, can be 0 ~ 4mA output current signal precision, 0 ~ 9999.9Hz precision frequency signals can be output 24V DC power, to apply two-wire field devices; Can accurate measurement of DC 0 ~ 24mA current signal and frequency signal. Widely used in valve positioned, transducer, digital display, etc. And the majority of manufacturers of industrial and mining enterprises, to replace imported high-precision portable signal generator.