ALARM DEVICE Russian patent published in 2003 - IPC

FIELD: burglar alarms; protection against invading through glazed building structures. SUBSTANCE: newly introduced in device are second sensing element, limiting element, filter, third and fourth safety elements, and digital analyzer designed for detecting alarm condition. Device provides for protection of glazed structure against destruction of its glass and displacement of its parts. Device is distinguished by enhanced resistance to noise spikes and supply voltage fluctuations and incorporates provision for testing basic digital signal processing units. EFFECT: enhanced functional reliability of device. 4 cl, 1 dwg