模入通道是把电子计算机用于自动检测和控制时,所须先解决的一个部分,但它在实用上还存在不少问题。本文对C3数据采集处理控制系统的模入通道作了简介,对研制使用中的难点,即调试中出现的通道干扰现象、采用的光电耦合器—MOS电路式变量程模拟开关、使用精密电源时的干扰现象、影响精密恒流源温度系数指标的因素、放大器调制解调晶体管对接开关的选配以及电子设备过压保护方案,进行了总结探讨,提出了解决途径。 A walk-in access is a part that must be solved when using an electronic computer for automatic detection and control. However, it still has many problems in practical use. In this paper, the introduction of C3 data acquisition and processing control system into the channel is introduced, the difficulty in the development of the use, that is, the channel interference occurs in the debugging, the use of optocoupler-MOS circuit type range analog switch, the use of precision power , The factors that affect the temperature coefficient of precision constant current source, the matching of amplifier modulation and demodulation transistor butt switch and the overvoltage protection scheme of electronic equipment are discussed and the solutions are put forward.