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ELECTROMECHANICAL ALARM SYSTEMS
8 other sections not shown
12 volts active active-standby switch adjustment alarm circuit alarm condition alarm line alarm relay alarm system amplifier antenna applied audio automatically beam burglar alarm cabinet cable camera capacitor central station channel circuitry connected control box control unit coverage degrees F detection diagram dialer door switch electrical electronic energy equipment fail-safe false alarms feet foil frequency geophone horn inches indication infrared input installation intruder klystron light line current located locking device loop magnetic master control meter microamperes microwave Model module monitor motion detector mounted normally closed normally open nuisance alarms ohmmeter operation outlet output panel plug position potentiometer power supply premises protected area pulse range relay contacts remote reset resistor Security Systems sensitivity control sensor shown in Fig solid-state sound standby battery standby power supervisory tamper switch telephone line temperature terminal tone transducers transistor ultrasonic voltage volts DC walk test window wire