2
MANUAL TIME SET
BUTTON
PACIFIC TIME
CENTRAL TIME
For a better understanding of how and why your clock works please continue
reading.
NOTHING IS MORE PRECISELY MEASURED THAN TIME!
And nothing keeps track of time more precisely and trouble free than La Crosse
Technology®
®
atomic clocks.
Since the beginning of time, man has been fascinated with the measurement of
time and has devised more accurate machines to measure time. Today, time is
precisely measured in the United States by the most accurate clock in North
America, the Atomic Clock of the US National Institute of Standards and
Technology, Time and Frequency Division in Boulder, Colorado. A team of atomic
physicists continually measures every second of every day to an accuracy of ten
billionths of a second per 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 radio transmitter located in
Fort Collins, Colorado. From here the exact time signal is continuously
broadcasted throughout the United States at 60 kHz to take advantage of stable
long wave radio paths found in that frequency range. Radio waves at these low
frequencies use the earth and the ionosphere as a wave-guide and follow the
curvature of the earth for long distances.
The built in antenna system in your clock will receive the WWVB signal anywhere
in North America within 2000 miles of Fort Collins where long-wave radio
reception is undisturbed. A microprocessor activates the receiver and processes
the time signal from Fort Collins overnight.
Through the radio signals, La Crosse Technology® atomic clocks always keep
precise time. The changeover from standard time to daylight saving time, and vice
versa, takes place automatically with the same precision.
ADDITIONAL DETAILS
•
The La Crosse Technology® atomic clock is designed for indoor use.
•
For indoor locations, select a location to place your radio controlled clock
where it will be at least six feet away from a TV, computer, air conditioner or
other household electrical appliances.
•
The optimal location is near a window. Windows facing Colorado provide the
best signal.
•
Do not submerge clock in water.
•
Extreme temperatures, vibration, and shock should be avoided to prevent
damage to the clock.
•
The WWVB time signal will easily penetrate masonry and wood framed
buildings.
•
The WWVB signal will penetrate almost every residential building and most
steel buildings if they have adequate windows. It is not possible, however, for
the WWVB signal to penetrate most indoor shopping malls and rooms in the
center of large office buildings that do not have windows.
•
In buildings that WWVB cannot penetrate you may set the time using the
manual time set button. When the clock receives the WWVB signal it will
automatically set the hands to the exact time.
BATTERY
COMPARTMENT
EASTERN TIME
MOUNTAIN TIME
DST ON/OFF BUTTON
