| 摘要 |
PCT No. PCT/JP86/00183 Sec. 371 Date Dec. 10, 1986 Sec. 102(e) Date Dec. 10, 1986 PCT Filed Apr. 14, 1986 PCT Pub. No. WO86/06174 PCT Pub. Date Oct. 23, 1986.A signal-measuring apparatus for measuring a level of a signal to be measured includes a reference signal oscillator, a variable local signal oscillator, a heterodyne type mixer, a bandpass filter and automatic detuning correction means. In the automatic detuning correction means, there are provided a peak value memory, a tracking circuit and a detuning-correction calculating circuit. When a filter output is obtained by passing the reference signal through the bandpass filter, a peak value is acquired by varying the oscillator frequency of the local signal. This peak value is stored in the peak value memory. Then, the signal to be measured is supplied to the bandpass filter to acquire another filter output. This filter output is calculated in the detuning correction calculating circuit based upon the above-described peak value as a reference value so as to correct the error caused by the filter detuning.
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