| 摘要 |
A signal detector having an excellent measurement capability that enables simple and accurate cause analysis of noise generation is provided. A signal suppression filter ( 22 ) that inhibits high-frequency signals contained in power voltage and a signal separation filter ( 23 ) that prevents transmission of the high-frequency signals are provided in series on power lines ( 21 A), ( 21 B) connected to a power input terminal (T 1 ), and a common-mode signal detection circuit ( 25 ) and a normal-mode signal detection circuit ( 26 ) are provided separately from each other. While bi-directionally blocking transmission of a high-frequency signal (noise) between the power supply and the device to be measured by the signal suppression filter ( 22 ) and the signal separation filter ( 23 ), the common mode signal and the normal mode signal generated in the device to be measured ( 3 ) and entering through a power output terminal (T 2 ) are detecting separately. The analysis of the cause of occurrence of a high-frequency signal produced in the device to be measured ( 3 ) is facilitated, and proper noise countermeasure may be taken.
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