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目前各种医用测量仪器正在向自动化、智能化方向发展,交流信号和直流信号的有效值是经常测量的参数。但是由于交流信号经过整流后有效值与直流信号不同,所以必须分档测量;加之所测信号的随机性,交、直流信号的自动判别和处理尚是一个有待解决的问题。作者介绍一种由常用集成电路组成的、软硬件结合的自动交直流判别系统,可在幅度和频率随机的条件下,对交流和直流的电流或电压信号进行自动判别,分别处理后指示有效值。该系统判别可靠,速度快,适应性强,可用于自动检测仪表和自动控制系统。
At present, various medical measuring instruments are being developed to the direction of automation and intelligence. The effective values of AC signals and DC signals are frequently measured parameters. However, since the effective value of the AC signal after rectification is different from that of the DC signal, the measurement must be carried out separately. In addition, the randomness of the measured signal, the automatic discrimination and the processing of the AC and DC signals are still a problem to be solved. The author introduces a commonly used integrated circuit, the combination of hardware and software, automatic AC-DC discrimination system, the amplitude and frequency of random conditions, the AC and DC current or voltage signals are automatically identified, respectively, after processing the effective value . The system is reliable, fast, adaptable, can be used for automatic detection instrumentation and automatic control system.