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    • 10. 发明授权
    • Frequency stability measuring apparatus
    • 频率稳定度测量装置
    • US07429896B2
    • 2008-09-30
    • US11466566
    • 2006-08-23
    • Masashi Hattori
    • Masashi Hattori
    • G01R23/14
    • G01R23/14
    • A frequency stability measuring apparatus for measuring a frequency fluctuation of a signal outputted from a given signal source includes: a reference signal output unit that outputs a reference frequency signal; a mixer that mixes a signal outputted from the signal source with the reference frequency signal outputted from the reference signal output unit and outputs a resultant signal; a filter that allows a low-frequency component of the signal outputted from the mixer to pass therethrough; a waveform-shaping circuit that shapes a waveform of a signal outputted from the filter; a counter that counts a number of pulses of a signal shaped by the waveform-shaping circuit; and a control unit that calculates average frequencies of the signal outputted from the filter within respective measurement periods of a predetermined length, and calculates and outputs a standard deviation of the average frequencies calculated
    • 用于测量从给定信号源输出的信号的频率波动的频率稳定度测量装置包括:输出参考频率信号的参考信号输出单元; 将从信号源输出的信号与从参考信号输出单元输出的基准频率信号混合的混频器,输出合成信号; 允许从混合器输出的信号的低频分量通过的滤波器; 波形整形电路,对从滤波器输出的信号进行波形整形; 计数器,其对由波形整形电路形成的信号的脉冲数进行计数; 以及控制单元,其计算在预定长度的各个测量周期内从所述滤波器输出的信号的平均频率,并且计算并输出计算出的平均频率的标准偏差