Tektronix TG700, Руководство пользователя

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GPS7 GPS Synchronization and Timecode Module
GPO Submenu Use this menu to select which alarm will trigger a signal output on the selected
GPI output. The output is an open collector with a weak pull up, so when it is
asserted, the output will be low. The following
fi gure shows the GPO submenu.
Figure 3-73: GPS7 module GPO submenu
Use the left ( ◄ ) or right ( ► ) arrow button to select from the following settings:
NONE: Disables the selected GPI output.
GPS Signal Warning (<Figure of Merit level>): Output goes high when the
GPS signal quality reaches the warning level set in the GPS SETUP submenu.
(See page 3-122.) Refer to
GPS Signal Quality (Figure of Merit) for more
information about GPS signal quality levels. (See page 3-103.)
Loss of Lock: Output goes low when a GPS or genlock loss of lock occurs.
A loss of lock alarm is triggered when the GPS signal falls below the user
de
fi ned threshold after the delay time has been exceeded.
Alarm Time: A time of day or counter alarm is triggered for one second
when the speci fi ed time is reached on the speci fi ed counter.
Near Loss of Genlock: Output goes low when the genlock frequency is near
the end of the oven oscillator tuning range. This can happen if the input signal
is too far from the correct frequency. This could also indicate that the oven
oscillator is near its end of life and the TG700 needs to be serviced.
No Genlock Detected: Output goes low when no Genlock signal is detected.
NOTE.
The GPIO alarms are active for the currently selected reference. For
example, GPS speci fi c alarms assert only if GPS is the selected reference and
the same for Genlock speci fi c alarms. If the selected reference is Internal, then
only the Alarm Time output can be used.
3–136 TG700 TV Signal Generator Platform User Manual