| 摘要 |
PURPOSE:To measure a correct level by making the frequency of a band pass filter having resolution in use coincident with an intermediate frequency and using a correction value to measure the level of an input signal to be measured. CONSTITUTION:At first, an applied voltage V0 corresponding to a tuning frequency f0 from a varactor diode applied voltage versus frequency tuning curve of the band pass filter 5 is obtained and the voltage is fed to a varactor diode of the filter 5. An output level of the filter 5 is digitized and stored in a peak value storage means 9. Then an input changeover means 2 is changed over to the position of the input signal to be measured, the measured value is digitized and inputted to a correction arithmetic means 10. The correction arithmetic means 10 applies the correction arithmetic to the measured value from a value stored in the storage means 0 and a value stored in a reference level storage means 17 and displays the result on a display device 18. |
