Tektronix ECO422D, Инструкция по эксплуатации

Страница: 42 / 128

Operating Basics
2- 4
ECO422D SD/HD Changeover Unit Instruction Manual
range of the check circuitry. Use this in conjunction with large H sync pulses to
increase the accuracy on the level check. Only use this switch in conjunction
with the User Defined Levels.
User Configuration Switch (S14 - 8).
This switch determines how the ECO422D
responds to faulty signals -- either Normal or Override.
For Normal operation, the user cannot switch to a bad signal whether the
instrument is in manual or auto switch mode. For example, the ECO422D is in
manual mode and the Primary signal is bad, while the Backup signal is good. If
the user presses the Sync Source button, the output will be the Backup signal. If
the user presses the Sync Source button again, the output continues to be the
Backup signal. It will not change to Primary until the signal is good and the fault
indicator is reset.
In the Override mode, the user can manually switch to a “bad” signal, with Auto
mode disabled.
Reference Level Adjustments (R266 and R265).
These two adjustments set the
reference level for the two user-defined signal options. Select these levels with
DIPs 6 (R266) and 7 (R265) of the Channel Configuration switches. These allow
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--9.
Power-up Delay Switch (S13)
4
. This hex switch (see Figure 2--2) sets the delay
duration between the time power is applied and the time the ECO422D starts
error detection. Each position of the switch increments the delay approximately
30 seconds (position 0 = no delay). The factory setting is position 5, which
provides a delay of slightly under three minutes.
Connectors
Figure 2--3 shows the layout of the rear panel of the ECO422D.
4
Serial number B030000 and later.