| 摘要 |
<p>A signal detector (4) includes a signal input section (6), a detector (7), and a converter. The signal input section (6) inputs a high frequency signal to be measured. The detector (7) detects the high frequency signal to be measured input by the signal input section (6). The converter (8, 21) amplifies the output from the detector (7) and includes a variable gain preamplifier (21) which has a first gain higher than a linear gain when the detecting output is smaller than a predetermined value and a second gain lower than the linear gain when the detecting output is larger than the predetermined value. A cable line (5) transmits an output from the variable gain preamplifier (21) of the converter (8, 21) of the signal detector (4). A measuring equipment body (10) includes a decoder (22, 120) and an analyzer (140). The decoder (22, 140) amplifies an output from the variable gain preamplifier (21) transmitted by the cable line (5) and includes a variable gain main amplifier (22) which has a first gain lower than a linear gain when an output from the variable gain preamplifier (21) is smaller than a predetermined value and a second gain higher than a linear gain when the output from the variable gain preamplifier (21) is larger than the predetermined value. The analyzer (140) performs predetermined signal analysis for an output amplified by the variable gain main amplifier (22) of the decoder (22, 120).</p> |
