| 摘要 |
PURPOSE:To enable purity measurement at a high speed with high accuracy, by adjusting the frequency and level of a reference signal from FM linear detection output due to both of oscillator output and the reference signal while ascertaining the normality of an oscillator output measuring system by said reference signal. CONSTITUTION:The outputs of an oscillator 7' and a reference signal generator 2 are applied to level meters 6, 7 through FM linear detectors 4, 5 of which the local frequencies are controlled by the control part 8 of respective measuring systems. In this case, the generator 2 is controlled through the control part 8 so as to make the outputs of the meters 6, 7 same and the frequency and level of a reference signal become equal to oscillation signal frequency and the level thereof. Subsequently, when the measuring systems are changed over through a switch 3, the normality of the detector 4 is ascertained by the reference signal and, at the same time, the oscillation output spectral purity is measured by the meter 7. By this mechanism, the measurement of the spectral purities of the outputs of a large amount of oscillators is easily and certainly performed at a high speed with high accuracy.
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