| 摘要 |
<p>PURPOSE:To easily and exactly detect abnormality such as interruption, etc., by detecting the abnormality of a transmission circuit not only when the level of a transmitted signal is less than a set value but also when a ratio to be occupied by a commercial frequency component is more than the set value in the living waveform of the transmitted signal. CONSTITUTION:The detection of the abnormality is executed by a computer 22. Namely, in this computer 22, the interruption of a shield line, etc., or the abnormality of an oscillation pickup 12 and preamplifier 16, etc., is judged when the level of the signal transmitted form each oscillation pickup 12 is less than the set value or when the ratio to be occupied by the commercial frequency (50 or 60Hz) component is more than the set value in the living waveform of the transmitted signal. Thus, the abnormality such as the interruption etc., can be easily and exactly detected.</p> |
