Tektronix ECO 422, Instruction Manual

Page: 33 / 177

ECO 422
2–1
Operating Basics
Controls and Indicators
Figure 2–1: Front-Panel Controls
Sync Source – Primary/Backup. The LED indicates the current Output (whether it
is from the Primary or Backup input). It can be manually changed using the Sync
Source button. (If the ECO 422 is in Normal mode, this is only true when the
other input is good or both inputs are bad.) Only one of these LEDs can be on.
Primary is the default at power-up.
Auto Switching – Switch on Fault/Disabled.
This selects whether the ECO 422 will
automatically switch to the other input source whenever it detects a fault (Switch
on Fault) or not switch (Disabled). Only one of these LEDs can be on. Switch on
Fault is the default at power-up.
Fault Indicator (Reset) – Primary/Backup.
Either one or both of these LEDs could
be on. They indicate that a fault has occurred on the input. Press the Reset button
to clear the fault indicators (turn off the LEDs) after the fault has been corrected.
The fault indicator does not automatically reset after an error condition improves.
At power-up, the LEDs are reset.
Front Panel – Enabled/Locked Out.
This control determines whether or not the
operator has access to the other front-panel controls. If it is Enabled, then the
user can control the instrument from the front panel. If it is Locked Out, then the
user can only toggle back to Enabled and no other front-panel controls are
available. The ECO 422 will automatically lock out after about 1 minute of
inactivity to prevent accidental switching. The front panel is automatically
locked out at power-up.
Front-Panel Controls (See
Figure 2–1)