Tektronix ECO422D, Instruction Manual, Page: 28 / 128

Getting Started
1- 8
ECO422D SD/HD Changeover Unit Instruction Manual
NOTE
. The BNC connectors are tightly spaced on the ECO422D rear panel. You
may find it necessary to use a BNC Cable Tool to remove or install cables
(example: Trompeter RT--1L).
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.
There are many different ways to configure the ECO422D. The following
illustration is only one example. One thing to keep in mind, the ECO422D will
automatically change to the Primary signals whenever it loses power. Therefore,
always power the Backup source and the ECO422D by the same source and the
Primary source separately. Using this scheme both power sources would have to
go down before you would lose your signals.
Use the Channel Configuration Switches Log Table on page 1--12 to record what
type of signals you have connected to each set of outputs on the rear panel. Then
use the DIP selection guide to make sure that the DIP switches are correctly
configured. There is also a reference card available to keep track of how the
ECO422D is configured and aid in setting up the instrument.
Cable Installation