... segregation circuits and optoelectronic-stable plastic circuit, by the rules of rectangular waveform wave, waveform width very stable, the frequency ... <3>Feature1, By F-V converter integrated circuit, conversion of high accuracy, good linearity. 2, A good temperature stability ... normal working conditions: temperature 0 ~ 50°C relative humidity of 15% ~ 85%; 10, standard RS-232 communication interface.< ...