Tektronix ECO 422, Instruction Manual

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Getting Started
ECO 422
1–7
Figure 1–8: Example of How the ECO 422 Can be Connected
Use the Channel Configuration Switches Table on page 1–9 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
ECO 422 is configured and aid in setting up the instrument.
There are the several different types of signal checking already available but you
may need to feed a different signal through the ECO 422. This section gives one
example, analog active video.
Active Analog Video. The ECO 422 will pass active analog video by using the no
checking mode, but there will be times when you need to check for the presence
of an active video signal. You have at least two options. First, you can set up a
custom checking level using one of the “user-defined” levels. This is great if you
are always passing color bars or some other test signal where the average picture
level remains constant and never fades to black. If the average picture level drops
below the custom set level then an error occurs, causing the ECO 422 to switch
sources. The set level could easily be well above black burst. The second option
is to use the predefined black burst level. This works very well when your goal is
to check for “present/not present” active video. It will accept long periods of
Hints on Using the User
Configuration Switches