Junghans Mega Futura J604.90 Manual Del Usuario página 4

Contents
1. Radio technology
2. Automatic time synchronisation
3. Functions
3.1 Time display
3.2 Date display
4. Reception indicator
5. Manual time synchronisation (transmitter calls)
5.1 Automatic transmitter search
6. Settings
6.1 Setting the time zone
6.2 Setting the language
6.3 12/24-hour display
6.4 Contrast setting
7. Re-starting after changing battery
7.1 Manual start
8. Illumination
9. Ready for use
10. General information
11. Technical information
12. Impermeability
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Page 1. Radio technology
31 The most up-to-date way to keep time.
34 5,000 years have passed since timekeeping began with sundials. In the
interim there have been water clocks, the mechanical clocks of the
37
13th century and quartz watches. Now we have the Junghans radio-
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controlled watch. This is a watch that, with good reception, will never
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go wrong and never need setting. The Junghans radio-controlled watch
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is absolutely precise, as it is linked via radio technology to the timing
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control of the most accurate clock in the world, For Europe this is the
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Caesium Time Base at the Physikalisch-Technischen Bundesanstalt in
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Braunschweig (Germany's Institute of Natural and Engineering
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43 Sciences). For Japan the Caesium Time Base of the National Institute for
44 Information and Communications Technology (NICT), a public admini-
stration authority organisation. For North America it is the U.S.
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Commerce Department's Caesium Time Base at the National Institute
45
of Standards and Technology (NIST) in Boulder, Colorado. These clocks
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are so accurate that they are expected to deviate by no more than
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1 second in a million years.
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