P.O. Box 749 Peekskill, NY 10566 Tel: (845) 737-7009 Fax: (845) 737-0426 Web: www.compuvideosystems.com
Mounting Location:
Model
Mounting locations:
CVDA-2
As close to center of the two output feeds or at recieving end
for Ground Loop Blocking
Model
# Of Inputs
# Of Outputs
Controls
Special Features
CVDA-2
1
2
Gain, High Freq.
Ground Loop
Isolation
INSTALLATION
The CVDA-2 is a light weight unit able to be mounted at any location. After the unit has
been placed, you can connect the power.
CONNECTING THE POWER
WARNING!
The DC power cannot be from the same supply as the DC camera
or video source. It must be from an isolated source.
For the CVDA-2, Hum in a video picture can be caused by several things:
A) Ground loop
B) Camera
C) Power supply failure
D) Induced hum due to proximity of ac power feeds.
The CVDA-2 is designed to only reduce or eliminate ground loop hum
between two points and will have minimal to no effect on the other
types of distortion. If you have any splices or bare cables that may
be touching metal between the camera and the CVDA-2, isolate it with
tape so that it does not touch any other metal items.
Ground loops usually become visible when several cameras are connected together at a
switcher or a quad screen splitter. The problem also occurs when a camera is located in a
different “ground” plane than the monitor is located in. The hum or interference is caused by
the differences in ground voltages from each device mixing together. By using the CVDA-2
to isolate the signal and the ground, the problem is resolved.
The CVDA-2 corrects the
ground-loop problem on the input side of a run, this still leaves a potential for a
ground-loop to occur between the 2 locations on the output side of the VDA. If this
problem should occur on one or both outputs simply add a GLB-ll to one of the 2
outputs.
