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A nuclear power plant consists of many complex systems,signal transmission and conversion inside and between these systems is often performed,the current/voltage conversion module is the most common small signal conversion function module,the new designed current/voltage can be used to convert two channel of 0-20 mA or 4-20 mA current signal to two channel corresponding 0-5 V or 1-5 V voltage signal,and the conversion accuracy can reach to 0.2%,meanwhile the conversion is isolated between the input and output signal. The new designed current/voltage conversion module is much more accurate,less delay time,more stabilization reliable operation,easier to install and use,the device has been successfully used in the nuclear power plant and achieved good reputation. 