Flashcards in Burglar Alarm Systems Deck (52)
List the six common features/factors for security system design.
Secure control panel
Communication to monitoring facility
What is a zone?
An input on a panel to monitor devices.
Define closed circuit/loop:
Opens the circuit upon activation
Define open circuit/loop:
Closes the circuit upon activation
What is the purpose of the EOLR?
To provide supervision of the circuit.
When using a 2000 ohm end of line resistor on a closed loop switch, what ohm values will you see during the following conditions? Active: Secure:
Active: infinite resistance
Secure: 2 kΩ
Define the following zone types:
1. Supports fire alarm devices.
2. Delays sounding an alarm for a programmed amount of time. Entry 30-45 seconds/ Exit 60 seconds.
3. System arming and disarming.
4. Detects activity inside the building.
5. Similar to 24-hour zones - causes the panel to communicate to monitoring system.
6. "Follows" the entry/exit zone.
7. (instant zones) Activates instantly when violated.
8. Constantly armed.
Define the following common control panel features:
a. Automatic arming
b. Automatic bypass
c. Automatic test
d. Force arming
e. Lock out
f. Opening and closing reports
h. Swinger shutdown
i. Walk test/chime
1. Sends a test signal to central monitoring station at pre-programmed intervals.
2. Automatically by-passes zones that are not ready (violated) when system is armed.
3. Functions as a separate system; assigns specific zones to specific keypads or users.
4. Prevents others from re-programming the system if not authorized.
5. Automatically arms by preprogrammed time.
6. Key pad chirps when zone is violated.
7. Automatically by-passes interior zones when entry/exit zone is not violated during exit time.
8. Reports to monitoring station when the system is armed and disarmed.
9. Bypasses zones that repeatedly go into alarm; constantly goes alarm, typically set at 3-10 times.
a-5. Automatic arming - Automatically arms by preprogrammed time.
b-7. Automatic bypass - Automatically by-passes interior zones when entry/exit zone is not violated during exit time.
c-1. Automatic test - Sends a test signal to central monitoring station at pre-programmed intervals.
d-2. Force arming - Automatically by-passes zones that are not ready (violated) when system is armed.
e-4. Lock out - Prevents others from re-programming the system if not authorized.
f.-8 Opening and closing reports - Reports to monitoring station when the system is armed and disarmed.
g-3. Partition - Functions as a separate system; assigns specific zones to specific keypads or users.
h-9. Swinger shutdown - Bypasses zones that repeatedly go into alarm; constantly goes alarm, typically set at 3-10 times.
i-6. Walk test/chime - Key pad chirps when zone is violated.
How are the system outputs controlled?
Programmed to follow the inputs on the control panel.
What piece of equipment is used for the alarm system communication interface?
RJ31X cord and jack
The purpose of a system keypad is to......
Provide an interface to the control unit for system use and programming.
Describe the difference between a duress code and a keypad panic.
Duress alerts the monitoring station with no alarm sounding
Panic alerts the monitoring station but sounds the siren.
What type contacts are typically wired in series configuration?
Closed circuit devices
Most contacts are activated by what two means?
Magnet or pressure
How is a heavy duty switch different from a regular duty switch?
It is heavier, is more durable and uses screws.
What types of switches are used for banks, jewelry stores, and some government facilities?
What is the most common form of space protection used in modern security systems?
PIR - Passive Infrared (motion)
How does a PIR detect an intruder?
It detects changes between the background temperature and targets when a different temperature enters the area.
When an object, such as a human, passes in front of the background, such as a wall, the temperature at that point in the sensor's field of view will rise from room temperature to body temperature, and then back again. The sensor converts the resulting change in the incoming infrared radiation into a change in the output voltage, and this triggers the detection.
List three things that may cause false alarms on PIR's.
Fans, change in room temperatures, shadows, insects
What are the two technologies used most in dual technology motion detection?
PIR and microwave
How does a microwave detector work?
Transmits microwave signals (very high frequency radio waves) and analyzes the signals that are reflected back to the unit (doplar shift)
How does an audio glassbreak detector work?
They detect the specific frequency of broken glass.
What is the range of most glassbreak detectors?
Can you mount a standard glassbreak detector above the window that is being protected?
Yes, but not recommended.
What items could interfere with the operation of an audio glassbreak detector?
Curtains, blinds, soft furniture, carpeting
List three sources of false alarms for audio glassbreaks.
Dishwashers, garage door openers, dropping/clanging pots and pans, high-pitch dog barking
How do dual technology audio glassbreaks reduce false alarms?
High frequency (breaking glass), low frequency (impact)
Why are mechanical shock sensors more prone to false alarms?
Lack of circuitry to analyze the shocks.
Where are shock sensors mounted?
Depends on the type used and intended application *