(RADIO CONTROLLED) CLOCKS
you know exactly what time it is? Well, the most accurate clock
in the U.S. is an atomic (cesium) clock located at the U.S. National
Institute of Standards and Technology in Boulder, Colorado. Atomic
clocks keep time using natural characteristic frequencies of atoms
such as cesium, hydrogen and rubidium and are extremely stable
because the effect of factors such as temperature, pressure and
humidity on these frequencies is negligible.
extremely accurate time measured at this facility is used by scientists,
radio and television stations, telephone companies, space program
personnel, air traffic control systems and others whenever a precise
knowledge of the time is essential. WWVB, a short wave station
operated by the Institute near Fort Collins, Colorado transmits
a continuous time-coded signal at 60kHz. This signal can be picked
up throughout the United States, Southern Canada and quite often
much farther afield. The signal is normally transmitted with an
accuracy better than 1 part in 100 billion and when received,
is generally accurate to within 100 microseconds.
manufacturers produce state of the art atomic clocks that tune
in to the radio time signal from WWVB and attempt to synchronize
with it. If because of poor signal reception the signal is not
detected, the radios generally try again every hour on the hour
for about 6 hours. Manual synchronization can also usually be
attempted at any time. The time read is automatically adjusted
for daylight savings time, leap year and even leap second. These
clocks perform best when not used in massive metal and concrete
structures unless they are near a window.
is a range of atomic clocks and weather related devices from Oregon
Scientific. These devices can provide you with the exact time
and the Cable Free monitoring of indoor and outdoor conditions.
Use them as well to monitor the temperature in your swimming
pool, basement freezer, wine cellar or the greenhouse.
weather related products like the BAR888, EMR812A,
WMR968, RMR112 and EMR963HG, please see the