Tektronix SPG8000 Technical Reference page 165

SYSTEM button menu
GPO Lock Error. Sets the delay time before a GPI alarm signal is sent when a loss
of lock to the GPS or genlock reference input signal to the instrument is detected.
Select this menu item and press the ENTER button to edit the delay. Use the left
(◄) or right (►) arrow button to select one of the time digits (HH:MM:SS), and
then use the up (▲) or down (▼) arrow button to edit the selected digit. Press
the ENTER button to confirm the delay selection.
GPO Lock Warning. Sets the delay time before a GPI alarm signal is sent when a
near loss of lock to the GPS or genlock reference input signal to the instrument is
detected. The threshold for near loss of lock is approximately 2 × 10e-6 from the
ends of the tune range.
Select this menu item and press the ENTER button to edit the delay. Use the left
(◄) or right (►) arrow button to select one of the time digits (HH:MM:SS), and
then use the up (▲) or down (▼) arrow button to edit the selected digit. Press
the ENTER button to confirm the delay selection.
GPO Time Error. Sets the delay time before a GPI alarm signal is sent when the
instrument detects that the selected time input is invalid. For example, if LTC is
the selected time input and the signal is missing or discontinuous.
Select this menu item and press the ENTER button to edit the delay. Use the left
(◄) or right (►) arrow button to select one of the time digits (HH:MM:SS), and
then use the up (▲) or down (▼) arrow button to edit the selected digit. Press
the ENTER button to confirm the delay selection.
GPO Time Warning. Sets the delay time before a GPI alarm signal is sent when the
instrument detects that the selected time input is present and valid, but not meeting
all expectations. For example, if LTC is the selected time input but the timing
between LTC and the genlock input does not meet the SMPTE 12M specification.
Select this menu item and press the ENTER button to edit the delay. Use the left
(◄) or right (►) arrow button to select one of the time digits (HH:MM:SS), and
then use the up (▲) or down (▼) arrow button to edit the selected digit. Press
the ENTER button to confirm the delay selection.
SPG8000 Technical Reference 153