Tektronix ECO 422, Instruction Manual

Page: 36 / 177

Operating Basics
2–4
ECO 422
the user to set their own signal switching level for special applications. Two
examples of signals that may require checking are an active video signal or an H
Sync signal.
The procedure used to set these levels is on page 2–8.
Connectors (See Figure 2–3)
Figure 2–3: Rear of the ECO 422
This instrument is intended to operate from a single-phase power source with
one current-carrying conductor at or near earth-ground (the neutral conductor).
Only the line conductor is fused for over current protection. Mains frequency is
50 or 60 Hz. The operating voltage range is continuous from 90 to 250 VAC.
WARNING.
Do not connect power to the ECO 422 if the top cover is not installed.
Dangerous potentials are present on the Power Supply board.
There are 33 video connectors on the rear panel. Eleven are for the Primary
input, 11 are for the Backup input, and 11 are for the Output. A general overview
of each one is below.
Primary.
Input from the primary sync generator. It can be PAL black burst, NTSC
black burst, serial digital video (NTSC component or composite), or serial digital
audio if signal checking is desired. There are also two user-defined levels
available. If no signal checking is required, almost any signal can pass through
the unit (within the bandwidth and voltage/current limitations). This should be
the same signal type as its Backup signal pair.
Output.
Signal output. It is either from the Primary or the Backup source. How
the ECO 422 is configured determines under what conditions the source changes.
Backup.
Input from the backup sync generator. This should be the same signal
type as its Primary signal pair.
Power
Video Signals
(11 Channels)