Technical information

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WHAT IS AN ATOMIC CLOCK?
A Cesium clock, also known as an “Atomic” clock is the most accurate clock in the world. It has an accuracy rate
of 2 nano seconds per day, or within 1 second in 1,400,000 years. The atomic clock measures time based on the
vibrations of the cesium atom while it is subjected to microwaves. Atomic time is used as the basis where high
precision is required.
HOW DOES ATOMIC TIMEKEEPING WORK?
The signal is generated from a generating tower, received by the watch and then processed. Depending on
your model, you may be able to receive signals from generating stations in North America, the United Kingdom,
Europe, Japan and China. The timepiece receives radio signals both automatically and on-demand at which time
both the time and calendar are updated.
WHAT IS THE BEST PLACE TO GET RECEPTION FOR THE RADIO SIGNAL?
Signal strength will vary by physical location, geography and distance from generating station as well as time
of day. The strongest signal strength occurs between 2:00 and 4:00 in the morning. This is when the least
atmospheric interference is present and when automatic updating occurs. During updating, whether automatic
or on-demand, the watch must remain in a motionless state, such as on a table.
WILL A CITIZEN ECO-DRIVE A•T WATCH AUTOMATICALLY ADJUST
TIME FOR DAYLIGHT SAVING TIME?
Provided automatic daylight savings time updating is activated (by default) and a signal is received,
Citizen Eco-Drive A•T collection timepieces will automatically adjust for daylight savings time changes.
DOES THE WATCH AUTOMATICALLY ADJUST TIME ZONES WHEN YOU TRAVEL?
No. As the watch does not feature GPS capabilities, you will need to manually change the time zone in
order for your A•T collection watch to reflect the appropriate local time.
CAN I GET A SIGNAL ANYWHERE?
Signal reception is subject to many variables such as distance from the generating station, building materials,
geography, time of day, weather, trees, etc. Many commercial structures are made of concrete and steel with
many electrical wires which may inhibit signal reception. Your instruction booklet will provide more details for
your particular model.
FREQUENTLY ASKED QUESTIONS
ATOMIC TIMEKEEPING (A•T)
A generating tower
transmits an exceptionally
accurate time signal from a
state-of-the-art atomic clock.
The watch’s internal receiver
captures the signal and
displays the precise time.
The atomic timing signal
is accurate to 1 second
over 20 million years.
ATOMIC TIMEKEEPING
WITH ECO-DRIVE TECHNOLOGY
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