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Commercial rubidium clocks are less accurate than caesium atomic clocks, which serve as primary frequency standards, so a rubidium clock is usually used as a secondary frequency standard. Commercial rubidium frequency standards operate by disciplining a crystal oscillator to the rubidium hyperfine transition of 6.8 GHz (6 834 682 610.904 Hz).
Rubidium standard clocks are prized for their low cost, small size (commercial standards are as small as 1.7 × 10 5 mm 3) [33] and short-term stability. They are used in many commercial, portable and aerospace applications. Modern rubidium standard tubes last more than ten years, and can cost as little as US$50.
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Catalog of Standard Reference Materials: Author: National Bureau of Standards: Software used: Digitized by the Internet Archive: Conversion program: Recoded by LuraDocument PDF v2.65: Encrypted: no: Page size: 565 x 719 pts; 543 x 719 pts; 545 x 715 pts; 548 x 709 pts; 541 x 703 pts; 543 x 702 pts; 534 x 706 pts; 539 x 706 pts; 539 x 704 pts ...
Other features of the new TR-6060 transmission include: Reduced friction in the shifter system courtesy of a new cam and anti-friction plunger to control the side load shift detents. Forward and rearward shift detent grooves are broached on the front of the main-shaft with a spring-loaded anti-friction roller, for more precise control of shift ...
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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.