Product guide

25
Sales: [phone] Technical: [phone] Accounts: [phone]
Dummy Cameras
Videcon
VD9000
Dummy Body Camera
Videcon
VD5112
Dummy Dome
Videcon
VD5314
Dummy Dome
Dummy body camera c/w lens,
matches Concept Pro camera
range
Dummy dome casing to match
VBP series white
Dummy dome casing to
match VBP series black
Dummy Cameras
HOLD
RW
.
ZOOM
OUT
FF
.
ZOOM
IN
NEAR
FAR
CLOSE
OPEN
FOCUS
IRIS
DISPLAY SEQ PANIC
ZOOM LOCKARCHIVE
PTZ SETUPSEARCH
RETURN ENTER
!
±
+
1
2345 6 7 8
PWR REC NET
CAMERA
DVR
MONITOR
0V
+V
COAXIAL CABLE
GROUND LOOP
ROLLING HUM BAR
WHAT IS A GROUND LOOP?
A ground loop occurs when there is a potential difference between inter-connecting equipment such as the camera and
DVR and is due to an imbalance in the power loading of the two systems. The potential difference causes a loop current
to flow between the two inter-connecting items, and as a result any interfering source such as 50 Hz mains power is
picked up by the ground current flowing through the braiding of the coaxial cable instead of it acting as a shield to protect
the interfering source from entering the coaxial cable. See Figure below.
The 50 Hz mains power or hum is then passed on along with the wanted video signal from the camera and displayed on
the monitor as a rolling hum bar
The Video Ground Loop Isolator should be installed at the CCTV Camera end by connecting the BNC Male connector of the
Isolator to the camera and the BNC Male connector of the coaxial cable to the BNC Female connector on the Isolator. In
a multi-camera installation it is recommended that a Video Ground Loop Isolator be installed for each camera.
TECHNICAL TIPS