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2. Atomic clock - Wikipedia

   en.wikipedia.org/wiki/Atomic_clock

   In addition to increased accuracy, the development of chip-scale atomic clocks has expanded the number of places atomic clocks can be used. In August 2004, NIST scientists demonstrated a chip-scale atomic clock that was 100 times smaller than an ordinary atomic clock and had a much smaller power consumption of 125 mW .

3. NIST-F1 - Wikipedia

   en.wikipedia.org/wiki/NIST-F1

   NIST-F1 is a cesium fountain clock, a type of atomic clock, in the National Institute of Standards and Technology (NIST) in Boulder, Colorado, and serves as the United States' primary time and frequency standard. The clock took fewer than four years to test and build, and was developed by Steve Jefferts and Dawn Meekhof of the Time and ...

4. List of atomic clocks - Wikipedia

   en.wikipedia.org/wiki/List_of_atomic_clocks

   This is a list of some experimental laboratory atomic clocks worldwide. This list is incomplete; you can help by adding missing items. (March 2013) Name

5. Radio clock - Wikipedia

   en.wikipedia.org/wiki/Radio_clock

   A modern LF radio-controlled clock. A radio clock or radio-controlled clock (RCC), and often colloquially (and incorrectly [1]) referred to as an "atomic clock", is a type of quartz clock or watch that is automatically synchronized to a time code transmitted by a radio transmitter connected to a time standard such as an atomic clock.

6. International Atomic Time - Wikipedia

   en.wikipedia.org/wiki/International_Atomic_Time

   The United States Naval Observatory began the A.1 scale on 13 September 1956, using an Atomichron commercial atomic clock, followed by the NBS-A scale at the National Bureau of Standards, Boulder, Colorado on 9 October 1957. [9] The International Time Bureau (BIH) began a time scale, T m or AM, in July 1955, using both local caesium clocks and ...

7. NIST-F2 - Wikipedia

   en.wikipedia.org/wiki/NIST-F2

   NIST physicists Steve Jefferts (foreground) and Tom Heavner with the NIST-F2 cesium fountain atomic clock, a civilian time standard for the United States. NIST-F2 is a caesium fountain atomic clock that, along with NIST-F1, serves as the United States' primary time and frequency standard. [1] NIST-F2 was brought online on 3 April 2014. [1] [2]