Masterclock
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.com
12
STATUS LED (LIGHT EMITTING DIODE)
The LED colons on the display will follow the following
protocol after power is applied:
TIME ZONE OFFSETS
The CLDNTD12 digital time display maintains time as
UTC initially. A Time Zone offset or bias can be
provided to adjust the time for display purposes. A
bias can be set as a positive (+) or negative (-) value.
Expect a resolution of one second.
DAYLIGHT SAVING TIME
An automatic Daylight Saving Time (DST)
adjustment
can be configured separately and in addition to a
Time Zone offset. DST begins on the second Sunday of
March at 2:00 AM (Local Time) and ends the first
Sunday of November at 2:00 AM (Local Time).
EU STANDARD – EUROPEAN UNION
In the European Union, daylight change times are
defined relative to the UTC time of day. Summertime
Period begins at 1:00 AM, UTC on the last Sunday of
March and ends at 1:00 AM, UTC on the last Sunday
of October.
FREEWHEELING ACCURACY
The CLDNTD12 has built-in provisions to allow it 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 CLDNTD12 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 mSec per day)
when Time Code is not present or cannot be decoded
(i.e. 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 with
a fully-charged battery under constant drain.
If the Time Code input
is
different from UTC, do not
adjust the Time Zone and/or DST
offset. These will adjust
automatically.
European customers:
Please
carefully consult the section
entitled “
Device Settings
” for
details on setting your
“
Summertime Period.
”
Daylight Savings Time (DST)
adjustments
must be configured
using the daylight time option
and not with the Time Zone
offset option in order to ensure
proper year-around operation.
LED
STATE
STATUS INDICATION
Flashing
No Reference:
The
CLDNTD12 is not able
to reference Time
Code
On Solid
Referenced Time:
The
CLDNTD12 is receiving
time referenced from
a Time Code
