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The Jensen Transformers VB-1BB Baseband-Composite
Video Isolator provides powerful 120 dB ground
isolation, making it the perfect choice for video
surveillance systems, or anywhere that high-performance
ground-loop isolation is needed.
Jensen Transformers' ISO-MAX Studio-Quality Video
Isolators provide the ultimate signal interface
Solutions. They solve the fundamental problems
associated with ground loops, without degrading signal
quality.
Ground Loops?
(or why the best planned systems sometimes look and sound bad)
It is a subject that is seldom discussed in manufacturers publications,
or even in magazines of the trade, but ground loops can happen even in the most
carefully planned A/V system. When ground loops happen in a video system, the
result is unwanted hum or video hum bars.
For example, in video surveillance systems, the power
supplies for the cameras are are typically powered by a
different source than the equipment that is used to
record and/or view the video.
When devices in the same system are powered by
separate power sources, that can cause a difference in
ground potential between the two pieces of equipment. It
can be because one of the circuits is loaded more
heavily than the other, or because one run is longer
than the other, or any number of other reasons that are
beyond the scope of this article, but the result of this
difference in ground potential is commonly referred to
as a ground loop.
The Solution
The Jensen Transformers VB-1BB is elegant in its simplicity. In the example
above one would simply insert the VB-1BB anywhere in the
video path between the camera and the monitor.
Immediately, the effects of the ground loop become a non-issue. Problem solved. There are not too many things that one can install in a
video system that can provide so much improvement with so little effort.
Jensen Transformers' Description
VIDEO ISOLATION TRANSFORMER
FOR 75 Ohm SYSTEMS
- Very high ground isolation: 120 dB CMRR
typ. at 60 Hz
- Wide bandwidth: !3 dB at 10 Hz and 10
MHz
- High input to output withstand voltage:
350 V RMS min at 60 Hz
- Precise impedance matching: VSWR under
1.06 typ. up to 6 MHz
- Low insertion loss: 0.55 dB typical
When inserted into standard 75 Ohm video
cabling, this transformer based isolator
eliminates video "hum bars", as well as the
often associated audio hum or buzz in multimedia
entertainment systems, by breaking the so-called
"ground loop". Mounting holes allow easy
horizontal or vertical mounting to standard rack
rails.
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