ECO422D SD/HD Changeover Unit Instruction Manual
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Getting Started
Product Description
The ECO422D SD/HD Changeover Unit (Figure 1--1 and Figure 1--2) provides
automatic selection of reference sources. Automatic changeover may occur upon
fault detection in any active source. Automatic transfer ensures uninterrupted
signals for critical applications.
The ECO422D is an in-line device without internal buffers. Switching is by
mechanical relay. The ECO422D also provides internal termination for unused
inputs.
NOTE
. A source transition can occur if the channel output amplitude is reduced.
This can be caused by over-termination, cable damage, or an accidental short to
ground. A channel’s selected input and its output are directly connected through
an internal relay, therefore the ECO422D detects an output reduction as an input
reduction. This does not apply to the three Option ELSW channels, which are
buffered.
To avoid this problem, work on an output only when the ECO422D is not in
operation. Disconnect the output cable from the ECO422D before working on
the cable, and verify proper termination before reconnecting the cable to the
ECO422D.
Option ELSW provides electronic switching on channels 4, 5, and 6, instead of
the mechanical relays, for faster switching on NTSC or PAL black burst, or
tri--level sync. With Option ELSW the channel 4, 5, and 6 inputs and outputs are
internally terminated. A relay is provided to switch the primary input to the
output in case of power failure.
There are 11 channels. Each consists of a Primary Input, a Backup Input, and an
Output. All relays switch in unison upon fault detection in any active channel,
front-panel command, or remote command.
Figure 1- 1: Front panel of the ECO422D
Содержание ECO422D
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Страница 19: ...Getting Started...
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Страница 37: ...Operating Basics...
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Страница 65: ...Theory of Operation...
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Страница 125: ...Appendices...
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