CLKTCD12 User Manual
4
© Masterclock
®
, Inc 2006-2007.
Rev 1.2.0 May ‘07
http://www.masterclock.com
Daylight time standards vary widely throughout the world. The analog clock provides
flexible configuration options supporting most world daylight time standards.
Pre2007 Standard – U.S.A. and Canada
Traditional US/Canada daylight/summer time is configured as one (1) hour
positive bias. For the U.S. (thru 2006) and Canada, daylight savings time begins
on the first Sunday of April at 2:00AM (Local Time) and ends on the last Sunday
of October at 2:00AM (Local Time).
Post2006 Standard – U.S.A.
On August 8, 2005, the Energy Policy Act of 2005 was signed. This Act changed
the time change dates for Daylight Saving Time in the U.S, effective in 2007.
Starting in 2007, DST will begin on the second Sunday of March at 2:00 AM
(Local Time) and end the first Sunday of November at 2:00 AM (Local Time).
[Note: this new DST standard is currently only for the United States of America.
The
US/Canada Standard pre2007
should continue to be used for Canada.]
EU Standard – European Union
In the European Union, daylight change times are defined relative to the UTC
time of day instead of local time of day (as in U.S.). For the European Union,
Summertime period begins at 1:00 AM UTC, and ends at 1:00 AM UTC.
European customers, please carefully consult the section entitled Device Settings
for details on setting daylight time.
Note: To ensure proper hands-free year-around operation, daylight time adjustments must
be configured using the daylight time option and not with the time zone offset option.
Factory default: daylight savings time is disabled. Decoding of the Date encoding in
time code is also disabled by default. You must enable and configure the settings.
Freewheeling Accuracy
The CLKTCD has built-in provisions to allow the clock to freewheel and maintain
accuracy for extended periods in the absence of time code. These features also allow the
unit to be set manually and run without time code with precision.
TCXO and RTC circuit
The CLKTCD contains a precision TCXO ( temperature compensated crystal
oscillator) and RTC (real time clock) circuit allowing the clock to maintain an
accuracy of +/- 1 minute per year to the last known time code input (+/- 165 mS
per day) when time code is not preset or cannot be decoded
[freewheeling mode]
.
Maintenance-free Rechargeable Battery
The RTC and TCXO are maintained continuously from a rechargeable battery
circuit during periods of power outage. Minimum holdover period is two weeks
Summary of Contents for CLKTCD12
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