| 摘要 |
<p>A frequency conversion section (2, 3) sweeps an object signal within a desired measurement frequency range, thereby frequency-converting the object signal. A peak detector (6) detects a peak of an output from the frequency converting section (2, 3). A measurement detector (7) measures and detects the output from the frequency conversion section (2, 3) simultaneously with the peak detection by the peak detector. The measurement detector (7) has an output characteristic lower than an output characteristic of the peak detector. A display (12) displays an output from the peak detector (6) and an output from the measurement detector (7) on a single display screen, in synchronism with the sweeping by the frequency conversion section (2, 3), with these outputs of the peak detector (6) and the measurement detector (7) being plotted along an axis representative of frequencies. In another mode of the invention, an alarm device indicates the fact that an output from the peak detector has exceeded a predetermined allowable limit level.</p> |
