Objective:To obtain suitable digital radiologic exposure factors of CR and DR by measuring stability of their X-ray tube voltage and exposure time.
目的：通过测试数字成像设备的X线机管电压和曝光时间稳定性，探讨数字成像摄影条件的选择原则。
The paper adopts the method of measuring time based on microprocessor in place of that measuring bridge voltage; it improves the methane sensor's stability and precision very well.
此研究采用新方法将桥路电压的测量转化为基于微处理器的时间测量，极大地提高了瓦斯传感器的稳定性和精度。
Its measuring principle and structure are presented. The applications of real time phasor are prospected in centralized monitoring, state estimation, FACTS and stability control of power system.
论述了相角测量装置的测量原理，以及实时相角测量装置和实时相角测量系统的构成，并展望了实时相角在集中监控、状态估计、FACTS、稳定控制等方面的应用。
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