| 摘要 |
<p>PURPOSE:To apply a magnetic field detector even to detection of a stationary magnetic field and even to detection of a variable magnetic field, and check a battery only by adding a check switch as a part. CONSTITUTION:A stationary magnetic field sensitive element and a variable magnetic field sensitive element are incorporated into a magnetic field detector 1, and when the magnetic field sensitive elements sense a magnetic field by turning on an electric power supply switch 3, an annunciator 2 operates to emit light. When a check switch 4 is pushed, if a battery is not consumed, the same annunciator 2 similarly operates to emit light.</p> |
