7800 Multiframe Manual
7825DSK2-LG(-HD)(-3G) 3G/HD/SD Dual Downstream Keyer
VLPRO OPERATION
Revision 2.0
Page 4-5
4.3.1.
Displaying Real Time Clock
The 7825DSK2-LG(-HD)(-3G) contains a real time clock that is used to drive the clock display logos
that can be placed on the screen. This battery backed up real time clock (known as RTC) free runs on
an internal oscillator and can be set from the front panel. When the 7825DSK2-LG(-HD)(-3G) is
powered up with a valid video input, a separate clock (known as the UTC) is initialized from the RTC
and maintains Universal Coordinated time (UTC) accurately from the video input so that it will not drift.
The 7825DSK2-LG(-HD)(-3G) automatically updates the RTC clock from the UTC clock to minimize
long term time drift. In order to keep the UTC clock in sync with your house master time code it
should also be locked to incoming linear time code connected to the LTC IN connector. The UTC
clock time is internally maintained as Universal Coordinated Time (UTC) but can also be adjusted for
time zone offsets from UTC and for daylight saving time, and displayed as local time (Local).
4.3.2.
Displaying the Universal Time Clock Time
This option is used to display the UTC time clock. The time displays are always shown in the 24 hour
time format.
4.3.3.
Displaying the Local Time
This option is used to display the clock time as local time. (UTC time adjusted for the time zone offset
and DST adjustment). The time displays are always shown in the 24 hour time format.
4.3.4.
Displaying the Local Date
This option is used to display the local date which is the UTC date adjusted by the time zone in
yy:mm:dd format.
When there is a valid LTC input to the 7825DSK2-LG(-HD)(-3G), the LTC time will
overwrite the Real Time clock that has been entered.
4.3.5.
Displaying the Universal Date
This option is used to display the UTC date in yy:mm:dd format.
4.3.6.
Displaying the Real Time Date
This option is used to display and set the real time date in the keyer.
When there is a valid LTC input to the keyer with the date encoded in the user
bits, the LTC date will overwrite the Real Time date that has been entered.
