| 摘要 |
PURPOSE:To enable both a signal to be analyzed and a signal indicative of the functional state inherent to an instrument to be displayed on one display by changing over the signal to be analyzed that is obtained by passing an input signal through a plurality of band-pass filters and the signal indicative of the functional state inherent to the instrument to each other. CONSTITUTION:The movable contacts of changeover switches 5, 5', 5'' and 5''' are connected to the input terminals of display drive circuits 2, 2', 2'' and 2''', the fixed contacts a, a1, a2 and a3 of the switches 5, 5', 5'' and 5''' to the output terminals of band-pass filters 1, 1', 1'' and 1''' and the other fixed contacts b, b1, b2 and b3 of the switches 5, 5', 5'' and 5''' to output terminals for a signal indicative of the functional state inherent to an instrument. By thus providing the changeover switches, a display can be used for the display of a conventional spectrum indicator or for a battery checker, tuning indicator, level meter, power meter or the like.
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