Tektronix SPG8000A, User Manual

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SPG8000A User Manual 145
Note : When the VITC or LTC inputs are used as time - of - day sources, the
hh:mm:ss:ff settings are synchronized to the VITC or LTC source (if present).
When the SMPTE309 Data mode is set to Use as Input or to Use as Input/Output,
the date is set using the VITC or LTC source. When the SMPTE309 Data mode is
set to Ignore, the date is set from the internal RTC. (See
SMPTE309 Data.)
Mode
When LTC Input or VITC Input is selected as the Time of Day source, use the
Mode drop- down list to select one of the synchronization modes:
•
Follow : The time of day follows the VITC or LTC on the input signal if the
signal is stable for at least 100 consecutive frames.
•
Synchronize Once : The VITC or LTC on the input signal is continuously
monitored until a stable signal is received (at least 100 consecutive frames).
At that time, the time of day synchronizes (once) to this reference.
•
Synchronize Now : The time of day attempts to synchronize with the VITC
or LTC on the input signal when you select Synchronize Now . A total of
ten attempts to synchronize are made. After ten attempts, no further attempts
are made to synchronize regardless if synchronization occurred or failed. A
stable signal of at least 100 consecutive frames is needed.
SMPTE309 Data
When LTC Input or VITC Input is selected as the Time of Day source, use the
SMPTE309 Data drop - down list to select how the instrument will respond to
ST309 data in the timing source:
Note:
The Time Zone Offset adjustment allows you to enter a time zone correction
of up to ±23:59 hours. However, the ST309 standard only implements codes for
time zones in the range of - 12 to +13 hours. Therefore, when you are using ST309
data as the Time of Day source, it is recommended that the combined programmed
offset from time zone and Daylight Savings Time be restricted to the range of -12
to +13 hours.
•
Ignore : If available, the HH:MM:DD;FF data on the incoming LTC/VITC
signal is used, but any YYYY-MM-DD, TZ - Offset and Daylight Savings
Time enabled/disabled data is completely ignored in the Time of Day system.
In this mode, the Time Zone and Daylight Savings Time settings in the
instrument menu are used to set the time of day from the input time code
and the date is set from the internal RTC. This is the mode that should be used
if there is no ST309 date data on the input time code. In this case, the
STATUS button display will still show the YYYY-MM-DD, TZ - Offset and
DST settings from the instrument menu.
•
Use as Input : The ST309 data in the timing source is used and applied to
the master Time system in the instrument. For example, if the data
indicates that the time zone offset is +8:00 hours, then the master Time is
set to the YYYY-MM-DD HH:MM:SS;FF from the LTC/VITC input,
minus the 8 hour offset. This makes the master Time set to UTC.
However, the time code data on all outputs is then recalculated based on
the time zone offset and DST offset settings on the instrument. This
mode is useful if the incoming time code data is from a different time
zone than the outputs you intend to create.
•
Use as Input/Output . The ST309 data in the timing source is used and