Tektronix SPG8000A, User Manual

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132 SPG8000A User Manual
the antenna input.
o
Jam Sync : This selection immediately synchronizes the instrument
time code to the selected time source for each output.
Note: A daily Jam Sync should be performed on systems running at non- integer
frame rates. This can be scheduled using the Jam Sync submenu in the Time
menu. (See Jam Sync submenu .)
o Preset Restore (MSB): T his selection enables pin 3 of the
GPI/LTC connector as an input selector to recall a numbered preset
(4 - 7). ( See SPG8000A Installation and Safety Instructions . )
•
GPI Output Alarms : Use these menu items to configure which
instrument faults will trigger an output signal on the selected GPI output.
Each Output .
Alarm Section has a series of faults that can be selected to trigger an
output signal. These faults are described in more detail under GPI Output
Alarm Selections. (See
GPI Output Alarm Selections
.)
Each GPI output corresponds to specific pins on the GPI and GPI/LTC
port connector on the rear panel of the instrument :
o
Output 1 Alarm Select : This output corresponds to pin 2 on the
GPI port connector and pin 1 on the GPI/LTC port connector.
o
Output 2 Alarm Select : This output corresponds to pin 3 on the
GPI port connector and pin 2 on the GPI/LTC port connector.
o
Output 3 Alarm Select : This output is not available on the
SPG8000A.
•
Alarm Delays : Use these menu items to configure the delay for each of
the GPO Lock and GPO Time error and warning conditions. The purpose
of the delay settings is to reduce the number of false alarms by allowing
time for the fault condition to clear before an alarm signal is sent. The
delays for each of the error and warning conditions are in the
HH:MM:SS format. The default delay is 10 seconds for each of the error
and warning conditions. The delay is applied to all three GPI output
signals.
o
GPO Lock Error : Sets the delay time before a GPI alarm signal is
sent when a loss of lock to the genlock reference input signal is
detected.
o GPO Lock Warning : Sets the delay time before a GPI alarm
si gnal is sent when a near loss of lock to the genlock reference
input signal is detected. The threshold for near loss of lock is
approximately 2 × 10e - 6 from the ends of the tune range.
o 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.