Figure 18: Custom Level Threshold Display - Tektronix ECO8000 Series User Manual

Menus
INPUT-OUTPUT. This menu item appears for only the LTC 1 channel. Select this
menu item and press the left (◄) or right (►) arrow button to set the LTC 1
channel to be an output or an input. When the LTC 1 channel is configured as an
input, this allows both ports to connect so that an LTC input can drive the common
line and input timecode to both SPG8000 generators.
You should set the LTC 1 channel to input only if your sync generators are using
LTC as their time source input.
ACTIVE. Select this menu item and press the left (◄) or right (►) arrow button to
enable or disable the selected channel. Press the ENTER button to implement the
selection. You should disable any channel that is not going to be used.
TRIGGER. When the selected channel is enabled (active), select this menu item
and press the left (◄) or right (►) arrow button to enable or disable the selected
channel from triggering a changeover if the signal level crosses the configured
threshold level. Press the ENTER button to implement the selection. For channels
with the trigger function disabled, the levels will still be shown on the front panel
LEDs, but the levels will not be used in the decision to switch signal sources.
THRESHOLD. When the selected channel is enabled (active), select this menu
item and press the left (◄) or right (►) arrow button to select the threshold level
that will trigger a changeover if the signal level crosses that threshold level. Press
the ENTER button to implement the selection. The available threshold levels
depend on the type of the selected channel: ELSW, relay, or LTC. (See Figure 17.)
If you set the threshold level to "Custom," you can use the left (◄) or right (►)
arrow button to set the threshold level. After you set the threshold level, press
the BACK button to exit the custom level edit mode. It is suggested that you set
the level so that the signal is near +3 dB relative to the threshold level as shown
below. For LTC channels, the level should be +4 dB relative to the threshold level.

Figure 18: Custom level threshold display

ECO8000 Series Automatic Changeover Unit User Manual 63