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INTRODUCTION
About Your Atomic Clock
In addition to a regular quartz time clock, the Model 7500E
contains an antenna and a microchip. The antenna receives the
official time signal from the U.S. Government's National Institute
of Standards and Technology and the microchip translates the
time signal and adjusts the time display to the correct time. The
Model 7500E receives a 60-kilohertz, low frequency AM radio
signal from the WWVB radio station maintained by the National
Institute of Standards and Technology (NIST). The NIST, using
its atomic clock, is the official timekeeper for the U.S. and is
located in Boulder, Colorado. The Model 7500E will work
anywhere it can receive the WWVB signal from the NIST. This
signal is broadcast to reach across the continental U.S. and into
parts of Canada and Mexico. To learn more about the NIST time
correction technology used in the Model 7500E, you can visit:
http://tf.nist.gov/stations/wwvb.htm