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Atomic Digital Clock
513-1211
Features:
Large 4 inch time display.
12/24-hour time selectable.
Atomic Time and Date with manual set option
Four Time Zones: Eastern, Central, Mountain, & Pacific.
Daylight Saving automatically updates (On/Off option).
Calendar: Month, Date, Day.
Time alarm with snooze.
Monitors Indoor temperature (°F or °C)
Low battery indicator.
Selector bar
Setup:
Select the time zone with the
SELECTOR BAR on the back of
the clock.
Slide battery cover up to open.
Insert three AA alkaline batteries
according to polarity markings.
Do not press buttons for four minutes to allow the clock to search
for a WWVB signal. The tower icon will flash.
Note: If only the bottom of the tower icon is showing and the
top of the icon is not flashing, reposition the clock for better
signal reception.
When WWVB signal reception occurs, the time and date will set
and the tower icon will show solid above the seconds.
Note: During the search for the time signal the other set functions
will not work. This is normal and not a defect in the clock. Press
the WAVE/+ button at any time to stop the signal search. Hold the
WAVE/+ button for 3 seconds to initiate a signal search.
WWVB Radio controlled time
The NIST radio station, WWVB, is located in Ft. Collins, Colorado and
transmits the exact time signal continuously throughout the United
States at 60 kHz. The signal has a range of up to 2,000 miles.
However, due to the nature of the Earth’s Ionosphere, reception is very
limited during daylight hours. The atomic clock will search for a signal
every night when reception is best. The WWVB radio station derives its
signal from the NIST atomic clock in Boulder, Colorado. A team of
atomic physicists continually measures every second of every day to
an accuracy of ten billionths of a second a day. These physicists have
created an international standard, measuring a second as
9,192,631,770 vibrations of a Cesium 133 atom in a vacuum. This
atomic clock regulates the WWVB transmitter.
The clock receives the time signal via its built-in antenna and
adjusts automatically to the selected time zone. Once the correct
time is set, the clock continues running with an internal quartz-
controlled mechanism.
The reception system of the clock daily compares its data at
2:00am, to the signal from the WWVB transmitter. If no signal is
received for four minutes, the system will automatically try to
compare the time at 3:00am, 4:00am and 4:00pm.
The internal quartz-mechanism is very accurate; therefore, it does
not matter if the clock is occasionally unable to receive the time
signals.
When the tower icon flashes, but does not set the time or the WWVB
tower does not appear at all, take note of the following:
Recommended distance to any interfering sources like computer
monitors or TV sets is a minimum of 6 feet (2 meters).
Within ferro-concrete rooms (basements, superstructures), the
received signal is naturally weakened. In extreme cases, please
place the unit close to a window and/ or point its front or back
towards the Fort Collins, Colorado, transmitter.
During nighttime, the atmospheric disturbances are usually less
severe and reception is possible in most cases. A single daily
reception is adequate to keep the accuracy deviation below 1
second.
Note: On rare occasions, the atomic clock is not able to detect the
WWVB-signal (disturbances, transmitting distance, etc.); the time can
be manually set.
Set Time:
The SET button will move through the program menu. The WAVE/+ or
DST/- buttons will change a value.
Hold the SET button for 3 seconds and the LCD will flash.
12/24-HOUR TIME: 12h or 24h will flash. Press and release the
WAVE/+ button to select 12-hour or 24-hour time format. Press
and release the SET button to confirm and continue.
HOUR: The hour will flash. Press and release the WAVE/+ button
to select the hour. Press and release the SET button to confirm
and continue.
MINUTES: The minutes will flash. Press and release the WAVE/+
button to select the minutes. Press and release the SET button to
confirm and continue.
YEAR: The year will flash. Press and release the WAVE/+ button
to select the year. Press and release the SET button to confirm
and continue. (The year will only show in the program menu).
MONTH: The month will flash. Press and release the WAVE/+
button to select the month. Press and release the SET button to
confirm and continue.
DATE: The date will flash. Press and release the WAVE/+ button
to select the date. (The weekday will set automatically). Press and
release the SET button to confirm and exit.
Other Settings: begin from normal time display.
DST: Hold the DST/- button for 3 seconds to turn DST on or off.
When it is on you will see the DST icon DST appear in above the
seconds.
FAHRENHEIT/CELSIUS: Hold the °C /°F button for 3 seconds to
display the indoor temperature in Fahrenheit or Celsius.
TIME MODE/ALARM MODE: Press and release the SET button
one time to switch from Time Mode to Alarm Mode. In Alarm
Mode, the letters AL will show in the seconds display.
Set Alarm Time: Press and release the SET button once to enter
Alarm Mode. The letters AL will show in the seconds display.
HOUR: Hold the SET button for 3 seconds. The hour will flash.
Press and release the WAVE/+ button to select the hour. Press
and release the SET button to confirm and continue.