This article simply introduces the work principles self-checking methods differential gain distortion DG differential phasic distortion DP of MD1721 Model Vector Oscollograph.
简述了MD 1721型矢量示波器的工作原理和自检方法，微分增益失真dg和微分相位失真dp的测量方法。
Lastly, the methods of software redundancy, setting present output state register unit, and setting self checking program to solve the problem of control state being out of order.
对于控制状态失常问题采用软件冗余、设置当前输出状态寄存单元和设置自检程序等对策。
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