evertz 5010, Инструкция по эксплуатации

Страница: 54 / 108

Model 5010 Time Code Master Manual
Page 4-20
Revision 3.1.1
OPERATING INSTRUCTIONS
How does the transition to DST end?
Let's say that DST ends at 2:00 am local time and DST is one hour ahead of normal time (you can
program the DST end time using the
DSTE
register):
DST end transition
Local time
HH:MM:SS
DST or normal? Comments
00:59:59 DST
01:00:00 DST
01:00:01 DST
...3556 seconds from 01:00:02 to 01:59:57 daylight saving time not shown...
01:59.58 DST
01:59.59 DST
01:00:00 Normal Time is turned back to normal
01:00:01 Normal
...3556 seconds from 01:00:02 to 01:59:57 standard time not shown...
01:59.58 Normal
01:59:59 Normal
02:00:00 Normal
02:00:01 Normal
Note that local time between 1:00:00 and 1:59:59 actually is repeated twice this day, first during DST
time, then clocks are turned back one hour to normal time, and the hour is repeated during standard
time and therefore this day has 25 hours (instead of 24 hours). To avoid confusion when referring to
time within this hour, it is important to tell whether it happened before of after the change back to
normal time. For further information about daylight saving time in your area consult the web page
http://www.timeanddate.com/time/aboutdst.html.
Because of the variation of daylight saving time rules throughout the world the 5010 has four registers
to allow the user to set the beginning and ending DST rules. The 5010 makes the following
assumptions about DST:
The time advances by 1 hour for DST.
For firmware previous to version 050215, the 5010 assumes that DST changeovers
occur at 02:00:00 (2 o’clock AM) on Sunday morning. Firmware starting with 050215
allows the user to set the time on Sunday that the DST changeover occurs.