| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem that a conventional method which utilizes a magnetostatic field detection to detect a DC electric signal, has a practicable limitation of allowing an electronic circuit signal to be about 5 V, 100 mA, is scarcely able to detect an electric signal of about DC 5 V, 2 mA surely in a non-contact fashion utilizing the magnetostatic field detection, has no means for the detection except for electrically connecting to a circuit to be detected, involves an internal resistance of an instrument in order to measure a true electric signal, and has no other choice of disregarding a minute electric power consumed in a minute circuit. SOLUTION: A non-contact magnetic modulation type signal amplifier is provided, which does not electrically connect to the circuit to be detected, surely reads and detects even the electric circuit signal of about DC 5 V, 2 mA in the non-contact fashion utilizing the magnetostatic field, can neglect influences of foreign magnetism and earth magnetism by using an inexpensive means, and amplifies and detects a minute magnetic signal, thereby solving the problem of the conventional method. COPYRIGHT: (C)2010,JPO&INPIT
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