CCTV System Components Flashcards
7 cards from real CCTV practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 CCTV System Components flashcards as text
What is the purpose of an 'IR cut filter' (ICR) in a CCTV camera?
Answer: Automatically switch between blocking and passing infrared light depending on lighting conditions
An ICR mechanically moves an IR-cut filter in front of the sensor during daylight for accurate color reproduction and removes it at night to allow IR light to enhance low-light sensitivity.
A technician installs a video balun on a CCTV system. What problem does this device solve?
Answer: It allows transmission of video over unshielded twisted pair (UTP) cable instead of coaxial cable
A video balun converts the impedance of an analog video signal so it can be carried over inexpensive Cat5/Cat6 UTP cable instead of coaxial cable.
What is the significance of a camera's 'minimum illumination' specification?
Answer: The lowest light level at which the camera can still produce a usable image
Minimum illumination specifies the lowest light level (in lux or lux-equivalent) at which the camera can capture a recognizable image, indicating its low-light capability.
In an analog CCTV system, what does a 'video distribution amplifier' (VDA) do?
Answer: Splits one video signal into multiple identical outputs while maintaining signal strength
A VDA takes a single analog video input and distributes it to multiple outputs simultaneously, buffering each output to prevent signal degradation from splitting.
Which camera form factor is most suitable for discreet indoor surveillance where the camera should be nearly invisible?
Answer: Pinhole camera
Pinhole cameras use an extremely small lens opening that can be concealed behind a tiny hole in a wall, ceiling tile, or everyday object, making them nearly undetectable.
What is the function of a CCTV system's 'motion detection zone' setting?
Answer: Restrict recording or alerts to specific regions within the camera's field of view where movement is relevant
Motion detection zones allow operators to define specific areas within the frame that trigger recording or alerts when motion is detected, ignoring movement in excluded areas like busy streets.
What is the advantage of H.265 (HEVC) compression over H.264 in IP camera systems?
Answer: H.265 delivers equivalent video quality at approximately half the bit rate of H.264
H.265/HEVC uses more advanced compression algorithms to achieve the same perceived video quality as H.264 at roughly 50% lower bit rate, reducing storage and bandwidth requirements.