| 摘要 |
<p>The system comprises a receiver antenne device capable of receiving by capacitive effect, a current of which the intensity is a function of the distance separating the receiver antenna device from the electrical line. A measuring and conditioning circuit converts the received current to a coded signal. Alarm circuits associated with the measuring and conditioning circuit generate an alarm signal when the coded signal reaches predetermined stored values. - Pref. the measuring and conditioning circuit has a low input impedance with relation to the source impedance and the influence of leakage through a supporting structure of the receiver antenna is considerably reduced.</p> |
