Read out time:
is the time taken to read the charge from the pixels in a CCD
chip.
Real time video:
is a picture with more than 24 frames per sec and therefore
looks continuous.
Receiver driver:
is a part of the matrix switcher placed at the camera point and
connected to the main switcher by a twisted pair cable. It is used to
decode the incoming control signals for the Pan Tilt Zoom functions.
Reed switch:
is a type of alarm activated when the contact is opened or
closed . It is widely used with doors, windows, roller shutters etc. and
can also activate a switcher to bring the nominated camera up for
extended viewing.
Regulated power supply:
is a type of DC power supply in which the ripple factor is
minimal.
Remote head camera:
is a type of camera in which the CCD chip is separated from the
camera body by cable. It is used in applications where the amount of
space is limited.
Resolution:
is a measure of picture definition and clarity and is
represented by number of lines. Greater the number of lines, higher the
resolution.
RG-11:
is a type of coaxial cable with a thicker centre core and used
for transmission of video signals up to 550m.
RG-59:
is a type of coaxial cable used for transmission of video
signals up to 230m. It is the most popular cable used in CCTV.
Ripple factor:
is the amplitude variation present in a DC power supply due to
insufficient filtering . A large variation can damage a DC camera.
RS-232:
is a communication protocol used for communication between
microprocessor based devices. |