Rubidium Frequency Clock
June 20th, 2008
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Supper Low JITTER Clock 11.2896Mhz Rubidium Frequency |  |
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US $149.00 | 13d 18h 35m |
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Ultra low jitter 16.9344Mhz Rubidium Frequency Clock | |
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US $169.00 | 13d 18h 40m |
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Rubidium Frequency Clock
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Supper Low JITTER Clock 11.2896Mhz Rubidium Frequency | |
|
US $149.00 | 13d 18h 35m |
|
Ultra low jitter 16.9344Mhz Rubidium Frequency Clock | |
|
US $169.00 | 13d 18h 40m |
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No items matching your keywords were found.
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No items matching your keywords were found.
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Rubidium Hydride $65.33 Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Rubidium hydride is the hydride of rubidium. It is synthesized using rubidium metal to react with hydrogen gas. As a hydride of an alkali metal, it is reactive towards even weak oxidizing agents. A redox reaction will occur with chlorine or fluorine and a lot of heat will evolve. Rubidium hydride will react violently with water or air and careful storage is necessary. Author: Surhone, Lambert M./ Tennoe, Mariam T./ Henssonow, Susan F. Binding Type: Paperback Number of Pages: 64 Publication Date: 2011/03/18 Language: English Dimensions: 5.98 x 9.02 x 0.15 inches |
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Rubidium Oxide $70.1 High Quality Content by WIKIPEDIA articles Rubidium oxide is the chemical compound with the formula Rb2O. Rubidium oxide is highly reactive towards water, and therefore it would not be expected to occur naturally. The rubidium content in minerals is often calculated and quoted in terms of Rb2O. In reality, the rubidium is typically present as a component of (actually, an impurity in) silicate or aluminosilicate. A major source of rubidium is lepidolite, KLi2Al(Al,Si)3O10(F,OH)2 wherein Rb sometimes replaces K. Rb2O is a yellow colored solid. The related species Na2O, K2O, and Cs2O are colorless, paleyellow, and orange, respectively. Author: Surhone, Lambert M./ Timpledon, Miriam T./ Marseken, Susan F. Binding Type: Paperback Number of Pages: 80 Publication Date: 2010/07/27 Language: English Dimensions: 6.00 x 9.00 x 0.19 inches |
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Rubidium Chloride $65.33 Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Rubidium chloride is the alkali metal halide RbCl. This alkali halide finds diverse uses, from electrochemistry to molecular biology. In its gas phase, RbCl is diatomic with a bond length estimated at 2.7868 . This distance increases to 3.285 for cubic RbCl, reflecting the higher coordination number of the ions in the solid phase. Depending on conditions, solid RbCl exists in one of three arrangements or polymorphs as determined with holographic imaging. Author: Surhone, Lambert M./ Tennoe, Mariam T./ Henssonow, Susan F. Binding Type: Paperback Number of Pages: 64 Publication Date: 2011/03/18 Language: English Dimensions: 5.98 x 9.02 x 0.15 inches |
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Rubidium : Rubidium-Strontium Dating, Rubidium Standard, Isotopes of Rubidium $7.47 No Synopsis Available |
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Rubidium Compounds : Rubidium Chloride, Rubidium Oxide, Rubicline, Alkalide, Rubidium Silver Iodide, Rubidium Hydroxide, Rubidium Nitrate $9.29 No Synopsis Available |
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Secondary Frequency Standard $81.25 High Quality Content by WIKIPEDIA articles In telecommunications, a secondary frequency standard is a frequency standard that does not have inherent accuracy, and therefore must be calibrated against a primary frequency standard. Secondary standards include crystal oscillators and rubidium standards. A crystal oscillator depends for its frequency on its physical dimensions, which vary with fabrication and environmental conditions. A rubidium standard is a secondary standard even though it uses atomic transitions, because it takes the form of a gas cell through which an optical signal is passed. The gas cell has inherent inaccuracies because of gas pressure variations, including those induced by temperature variations. There are also variations in the concentrations of the required buffer gases, which variations cause frequency deviations. Author: Surhone, Lambert M./ Tennoe, Mariam T./ Henssonow, Susan F. Binding Type: Paperback Number of Pages: 104 Publication Date: 2010/09/18 Language: English Dimensions: 6.00 x 9.02 x 0.25 inches |
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Frequency $14.99 Frequency |
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Pilot Q7 Rubidium Mechanical Pencils (Pack of 6) $37.4 This retractable Q7 gel pen from Pilot features an advanced, futuristic design with guaranteed smooth writing. The contoured rubber grip reduces writer's fatigue for added comfort. Contoured rubber gripPocket clip and eraserRefillableLead size: 0.7 mmRubidium barrelPack of 6 |
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The Measurement of Time: Time, Frequency and the Atomic Clock $160.88 No Synopsis Available |
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Drawmer M Clock Lite Master Clock $960.05 The Drawmer M-Clock Lite: One of the essential requirements for high-quality digital recording is a first class, high-stability master clock generator. And it's pretty much a guarantee that you're going to adding more digital gear to your setup, which means you'll need to provide a master clock for more units. And as digital technology improves, clock rates are going to get higher. Rather than adding more clocks and daisy chaining to get the number of WC I/O you need, or paying for I/O you won't use, the Drawmer M-Clock Lite provides you with a simple, high-quality clock generator with 10 word clock outputs, and is forward compatible with high-speed clocks predicted for the future. M-Clock Lite features an AES Grade 1 master clock generator, meaning that the generated clock has a long-term frequency accuracy of +/- 1ppm.M-Clock Lite offers clock rates of 44.1, 48, 88.2, 96, 176.4, 192, 352.8 and 384kHz at extremely low jitter. An external clock input allows the user to select an alternative clock source without having to re-route clock cables. 10 Outputs are provided, 8 at the rear and 2 for easy access on the front panel. |
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Used Drawmer M Clock Lite Master Clock $960.05 The Drawmer M-Clock Lite: One of the essential requirements for high-quality digital recording is a first class, high-stability master clock generator. And it's pretty much a guarantee that you're going to adding more digital gear to your setup, which means you'll need to provide a master clock for more units. And as digital technology improves, clock rates are going to get higher. Rather than adding more clocks and daisy chaining to get the number of WC I/O you need, or paying for I/O you won't use, the Drawmer M-Clock Lite provides you with a simple, high-quality clock generator with 10 word clock outputs, and is forward compatible with high-speed clocks predicted for the future. M-Clock Lite features an AES Grade 1 master clock generator, meaning that the generated clock has a long-term frequency accuracy of +/- 1ppm.M-Clock Lite offers clock rates of 44.1, 48, 88.2, 96, 176.4, 192, 352.8 and 384kHz at extremely low jitter. An external clock input allows the user to select an alternative clock source without having to re-route clock cables. 10 Outputs are provided, 8 at the rear and 2 for easy access on the front panel. |
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Galileo, The Best Atomic Clock in Space
Atomic Clocks: History and Development
Atomic clocks have been with us for over fifty years now and most people have heard of them and know they are very accurate, but how accurate are they and why do we need such accurate clocks?
Atomic clocks are used by many of us even if we are not aware of it. The time they tell is relayed around the world and picked up by time servers using the protocol NTP to synchronise networks, they are vital for lots of technologies, such as global satellite navigation, and TV signal timings.
Before the development of the atomic clock the most precise timekeeping devices were electronic clocks which would lose a second or two every week. These had largely replaced mechanical clocks which were less accurate still.
Mankind has always had a fascination for keeping track of the time but knowing the precise time has never been too important. A second or even a minute’s difference does not affect our day-to-day lives.
However, as technology has advanced the need for more precise timekeeping has increased. Satellites that have to be navigated and communicate with the Earth from hundred, thousands and even millions of miles away require exact timing. Light and therefore radio waves can travel 300,000 km every second so slight inaccuracies in time can have massive differences.
The first accurate atomic clock was built y Britain’s National Physical Laboratory in 1955 by Dr Louis Essen who based his clock around the oscillation of the caesium -133 atom. The idea was actually first conceived as far back as 1879 when Lord Kelvin proposed that time-keeping based on how atoms behaved would be a better way to count time intervals than anything else.
The first generation of atomic clocks (also known as caesium oscillators) used the frequency of this atom which oscillates 9,192,631,770 times every second. Essen’s model was accurate to a second every 300 years but developments of the caesium oscillator mean they can now achieve accuracies of one second every 80 million years.
Yet as technologies get more advanced, scientists strive to make better and more accurate clocks. Rubidium standard clocks offer no better accuracy than caesium models but are smaller and cost less (caesium oscillators are generally only to be found in large-scale physics laboratories).
Clocks using just a single atom have been developed that offer even more accuracy. A clock based on a single mercury atom has achieved accuracies of one second in 400 million years and it is expected that a new type of strontium clock that uses light will go even better.
The future for atomic clocks is ever increasing accuracy combined with scaling down the size and cost of them. The American National Institute of Standards and Technology (NIST) have unveiled a chip-sized atomic clock that boasts millisecond accuracy.
Atomic clocks are now part and parcel of our lives without the time signals they transmit to the world that are picked up by NTP servers modern communication from Internet shopping and GPS and technological advances such as satellite navigation would become impossible.
About the Author
Richard N Williams is a technical author and specialist in atomic clocks, telecommunications, NTP and network time synchronisation helping to develop dedicated NTP clocks. Please visit us for more information about atomic clocks or other network time server solutions.
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Tags: atomic, clock, oscillators, rubidium, rubidium frequency clock, time