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微机测控现场往往存在着许多干扰源,其中影响较大的是50Hz的工频干扰。消除工频干扰常用的方法是在A/D转换电路之前加RC滤波器,或采用积分时间等于20ms整数倍的双积分A/D转换器,这些都是从硬件上采取的措施。我们在研制的MCS-51系列单片机温控系统中,尝试了用数字滤波软件消除工频干扰,取得了良好效果。
Computer monitoring and control often exist many interference sources, of which the impact is larger 50Hz frequency interference. Common methods to eliminate power frequency interference is to add an RC filter in front of the A / D conversion circuit or a dual-integrated A / D converter with an integral time equal to an integer multiple of 20ms, all of which are measures taken from the hardware. We developed the MCS-51 series SCM temperature control system, try to use digital filtering software to eliminate frequency interference, and achieved good results.