The EMG preamplifier circuit and other circuits are isolated by high-linearity octocoupier and isolated power that reject the industry interference and improve the security of the system.

Compared with DC coupling signal processing, it need lower requirement of signal processing circuit and have the merit of high signal-to-noise performance although it require the device of modem.

To use the way of put a driven circuit behind the pulser, lead through the input of count clock pulse, can avoid the irregular date on the counter during experiment effectively.