| class="wikitable" style="text-align:center;" |
| Name
! Operation date
! Type
! Accuracy
! Location
! Image |
|---|
CS1[{{cite web|title=Seit wann läuft die erste Atomuhr in der PTB?|work=Themenrundgänge / Fragen zur Zeit|publisher=Physikalisch-Technische Bundesanstalt|url=http://www.ptb.de/cms/themenrundgaenge/wegweiser/fragenzurzeit/fragenzurzeit11.html|accessdate=2013-02-04|url-status=dead|archiveurl=https://web.archive.org/web/20121127215018/http://www.ptb.de/cms/themenrundgaenge/wegweiser/fragenzurzeit/fragenzurzeit11.html|archivedate=2012-11-27}}]
| 1969
| Cs
| {{val|7|e=-15}}
| {{unbulleted list|Physikalisch-Technische Bundesanstalt|Braunschweig, {{DEU}}}}
| |
CS2[{{cite web|title=Seit wann läuft die erste Atomuhr in der PTB?|work=Themenrundgänge / Fragen zur Zeit|publisher=Physikalisch-Technische Bundesanstalt|url=http://www.ptb.de/cms/themenrundgaenge/wegweiser/fragenzurzeit/fragenzurzeit11.html|accessdate=2013-02-04|url-status=dead|archiveurl=https://web.archive.org/web/20121127215018/http://www.ptb.de/cms/themenrundgaenge/wegweiser/fragenzurzeit/fragenzurzeit11.html|archivedate=2012-11-27}}]
| 1985
| Cs
| {{val|1.2|e=-14}}
| {{unbulleted list|Physikalisch-Technische Bundesanstalt|Braunschweig, {{DEU}}}}
| 100px |
| CS3
| 1988
| Cs
|
| {{unbulleted list|Physikalisch-Technische Bundesanstalt|Braunschweig, {{DEU}}}}
| |
| CS4
| 1992-2005
| Cs
|
| {{unbulleted list|Physikalisch-Technische Bundesanstalt|Braunschweig, {{DEU}}}}
| 100x100px |
CSF1[{{cite web|title=Seit wann läuft die erste Atomuhr in der PTB?|work=Themenrundgänge / Fragen zur Zeit|publisher=Physikalisch-Technische Bundesanstalt|url=http://www.ptb.de/cms/themenrundgaenge/wegweiser/fragenzurzeit/fragenzurzeit11.html|accessdate=2013-02-04|url-status=dead|archiveurl=https://web.archive.org/web/20121127215018/http://www.ptb.de/cms/themenrundgaenge/wegweiser/fragenzurzeit/fragenzurzeit11.html|archivedate=2012-11-27}}]
| 1999
| Cs fountain
| {{val|4|e=-16}}
| {{unbulleted list|Physikalisch-Technische Bundesanstalt|Braunschweig, {{DEU}}}}
| |
CSF2[{{cite web|title=Seit wann läuft die erste Atomuhr in der PTB?|work=Themenrundgänge / Fragen zur Zeit|publisher=Physikalisch-Technische Bundesanstalt|url=http://www.ptb.de/cms/themenrundgaenge/wegweiser/fragenzurzeit/fragenzurzeit11.html|accessdate=2013-02-04|url-status=dead|archiveurl=https://web.archive.org/web/20121127215018/http://www.ptb.de/cms/themenrundgaenge/wegweiser/fragenzurzeit/fragenzurzeit11.html|archivedate=2012-11-27}}]
| 2009
| Cs fountain
| {{val|2|e=-16}}
| {{unbulleted list|Physikalisch-Technische Bundesanstalt|Braunschweig, {{DEU}}}}
| |
| FOCS
|
|
|
| {{unbulleted list|Federal Institute of Metrology|Wabern, Switzerland}}
| |
NPL-CsF2, Yb+ and Sr+ ion clocks, Sr lattice clock, 4 hydrogen masers[{{cite web|last=Palmer|first=Jason|title=UK's atomic clock 'is world's most accurate'|publisher=BBC|url=https://www.bbc.co.uk/news/science-environment-14657002|accessdate=2013-03-02}}][{{cite web|url=http://www.npl.co.uk/science-technology/time-frequency/research/|title= Research - Time and Frequency|accessdate=2015-06-12}}]
|
|
|
| {{unbulleted list|National Physical Laboratory|Teddington, London, {{UK}}}}
| |
NIST-F1,[{{cite web|title=A Brief History of Atomic Clocks at NIST|publisher=The National Institute of Standards and Technology (NIST)|url=http://tf.nist.gov/cesium/atomichistory.htm|accessdate=2013-02-04}}]
|
| Cs fountain
| {{val|3.1|e=-16}}
| {{unbulleted list
| NIST Boulder Laboratories
| Boulder, Colorado {{USA}}[{{cite web|last=Newman|first=Michael E.|title=NIST-F1 Cesium Fountain Clock|work=NIST News|publisher=The National Institute of Standards and Technology (NIST)|date=1999-12-29|url=https://www.nist.gov/public_affairs/releases/n99-22.cfm|accessdate=2013-02-04}}]
}}
| 100px |
NIST-F2[{{cite web|title=NIST Launches a New U.S. Time Standard: NIST-F2 Atomic Clock|publisher=The National Institute of Standards and Technology (NIST)|url=https://www.nist.gov/pml/div688/nist-f2-atomic-clock-040314.cfm|accessdate=2016-02-09}}]
|
| Cs fountain
| {{val|1.1|e=-16}}
| {{unbulleted list
| NIST Boulder Laboratories
| Boulder, Colorado {{USA}}[{{cite web|last=Newman|first=Michael E.|title=NIST-F1 Cesium Fountain Clock|work=NIST News|publisher=The National Institute of Standards and Technology (NIST)|date=1999-12-29|url=https://www.nist.gov/public_affairs/releases/n99-22.cfm|accessdate=2013-02-04}}]
}}
| 100x100px |
| USNO Alternate Master Clock
|
|
|
| {{unbulleted list
| Schriever Air Force Base
| El Paso County, Colorado {{USA}}[{{cite web|title=U.S. Naval Observatory Alternate Master Clock|publisher=U.S. Navy|url=http://tycho.usno.navy.mil/falcon.html|archive-url=https://web.archive.org/web/19961126212234/http://tycho.usno.navy.mil/falcon.html|url-status=dead|archive-date=November 26, 1996|accessdate=2013-02-09}}]
}}
| 100px 100px |
| WWV
|
|
|
| {{unbulleted list
| WWVB|Larimer County, Colorado {{USA}}[{{cite web |title=Larimer County station helps set clocks |url=https://www.coloradoan.com/story/news/2015/03/06/larimer-county-station-helps-set-clocks/24527655/ |author= |date=July 24, 2015 |website=Fort Collins Coloradoan |publisher=Gannett Company |access-date=August 27, 2018}}]
}}
| |
| Department of Defense master clock
|
|
|
| {{unbulleted list
| United States Naval Observatory
| Washington, D.C. {{USA}}
}}
| 100px |
| 18 cesium atomic clocks and 4 hydrogen maser clocks
|
| Cs, H
|
| {{unbulleted list
| National Institute of Information and Communications Technology
| Koganei, {{JAP}}[{{cite web|title=Mission of Japan Standard Time Group - Generation of Japan Standard Time (JST)|publisher=National Institute of Information and Communications Technology|url=http://jjy.nict.go.jp/mission/page2-e.html|accessdate=2013-03-05}}]
}}
| |
| Optical lattice clock
|
|
|
| {{unbulleted list
| University of Tokyo
| Bunkyō, Tokyo, {{JAP}}[{{cite web|last=Motal|first=Julius|title=Japanese atomic clock is accurate to a 100 quadrillionth of a second|work=Geek.com|publisher=Ziff Davis, Inc.|date=2011-08-30|url=http://www.geek.com/articles/geek-cetera/japanese-atomic-clock-is-accurate-to-100-quadrillionth-of-a-second-20110830/|accessdate=2013-03-02|archive-date=2012-06-14|archive-url=https://web.archive.org/web/20120614183703/http://www.geek.com/articles/geek-cetera/japanese-atomic-clock-is-accurate-to-100-quadrillionth-of-a-second-20110830/|url-status=dead}}][{{cite web|title=Quantum Metrology Laboratory|publisher=RIKEN Advanced Science Institute|url=http://www.asi.riken.jp/en/laboratories/chieflabs/katori/index.html|accessdate=2013-03-05|archive-url=https://web.archive.org/web/20130303112230/http://www.asi.riken.jp/en/laboratories/chieflabs/katori/index.html|archive-date=2013-03-03|url-status=dead}}]
}}
| |
NMIJ-F1, NMIJ-F2[{{Citation|last=Takamizawa|first=A.|last2=Yanagimachi|first2=S.|last3=Shirakawa|first3=Y.|last4=Watabe|first4=K.|last5=Hagimoto|first5=K.|last6=Ikegami|first6=T.|title=Cesium Atomic Fountain Clocks at NMIJ|pages=321–328|work=Precise Time and Time Interval Systems and Applications Meeting|url=http://www.pttimeeting.org/archivemeetings/2010papers/paper25.pdf|url-status=dead|archiveurl=https://web.archive.org/web/20110428030714/http://www.pttimeeting.org/archivemeetings/2010papers/paper25.pdf|archivedate=2011-04-28}}]
|
| Cs fountain
| {{val|4.7|e=-16}}
| {{unbulleted list
| National Metrology Institute of Japan
| Tokyo, {{JAP}}
}}
| |
Optical clock[{{cite web|last=Wang|first=Yuanyuan|title=China unveils first optical clock|work=English News|publisher=Xinhuanet|date=2012-07-12|url=http://news.xinhuanet.com/english/china/2012-07/12/c_131711882.htm|accessdate=2013-02-04|url-status=dead|archiveurl=https://web.archive.org/web/20120715070848/http://news.xinhuanet.com/english/china/2012-07/12/c_131711882.htm|archivedate=2012-07-15}}]
| 2012
| Ca ion
|
| {{unbulleted list
| Hubei, {{CHN}}
}}
| |
Caesium Beam Atomic Clock[{{cite web|title=Caesium Beam Atomic Clock|publisher=The Government of the Hong Kong Special Administrative Region|url=http://www.weather.gov.hk/gts/time/Cs-atomicclock.htm|accessdate=2013-02-14}}][{{cite web|title=History of Hong Kong Time Service|publisher=The Government of the Hong Kong Special Administrative Region|url=http://www.hko.gov.hk/gts/time/History_of_HK_Time_Service.htm|accessdate=2013-02-11}}]
|
| Cs
|
| {{unbulleted list
| Hong Kong Observatory
| Tsim Sha Tsui, Hong Kong {{CHN}}[{{cite web|title=Contact us|publisher=The Government of the Hong Kong Special Administrative Region|url=http://www.hko.gov.hk/contact.htm|accessdate=2013-02-11}}]
}}
| |
9 Agilent 5071A caesium clocks[{{cite web|title=Clocks and Time scales|publisher=National Time and Frequency Standard Laboratory|url= http://www.stdtime.gov.tw/english/index_b/b_1.htm|accessdate=2013-02-14}}]
|
| Cs
| {{val|5|e=-13}}
| {{unbulleted list
| National Standard Time and Frequency Laboratory
| Taoyuan, {{TWN}}[{{cite web|title=Current activities of the National Standard Time and Frequency Laboratory of the Telecommunication Laboratories|url=http://tycho.usno.navy.mil/ptti/ptti2002/paper40.pdf|accessdate=2013-02-14|url-status=dead|archiveurl=https://web.archive.org/web/20130217232509/http://tycho.usno.navy.mil/ptti/ptti2002/paper40.pdf|archivedate=2013-02-17}}]
}}
| |
KRISS-1[{{cite web|title=Development of Korea's First Primary Frequency Standard, 'KRISS-1'|publisher=KRISS|url=http://www.kriss.re.kr/eng/file/4news.pdf|accessdate=2013-03-01}}][{{cite journal|last1=Lee|first1=Ho Seong|last2=Kwon|first2=Taeg Yong|last3=Park|first3=Sang Eon|last4=Choi|first4=Sang-Kyung|last5=Park|first5=Young-Ho|title=Research on Cesium Atomic Clocks at the Korea Research Institute of Standards and Science|journal=Journal of the Korean Physical Society|volume=45|issue=2|pages=256–272|date=August 2004|url=http://www.kps.or.kr/jkps/downloadPdf.asp?articleuid=%7BDD0D58EF-36A7-492E-9047-BBB38B43E895%7D|accessdate=2013-03-06|url-status=dead|archiveurl=https://web.archive.org/web/20160304043030/http://www.kps.or.kr/jkps/downloadPdf.asp?articleuid=%7BDD0D58EF-36A7-492E-9047-BBB38B43E895%7D|archivedate=2016-03-04}}]
|
| Cs
| {{val|1|e=-14}}
| {{unbulleted list
| Korea Research Institute of Standards and Science
| Daejeon, {{KOR}}
}}
| 100px |
Caesium atomic clocks[{{cite web|title=About SST|publisher=National Metrology Centre|url=http://www.singaporestandardtime.org.sg/aboutsst.htm|accessdate=2013-03-01|url-status=dead|archiveurl=https://archive.today/20130418150839/http://www.singaporestandardtime.org.sg/aboutsst.htm|archivedate=2013-04-18}}]
|
| Cs
|
| {{unbulleted list
| National Metrology Centre
| Queenstown, {{SGP}}
}}
| |
Five caesium clocks, one passive hydrogen maser, two active hydrogen masers.[{{cite web|title=Time and Frequency Metrology|work=CSIR-National Physical Laboratory|publisher=CSIR-National Physical Laboratory|url=https://www.nplindia.org/index.php/science-technology/indian-standard-time-metrology-division/time-and-frequency-metrology-section/|accessdate=2023-03-25}}]
|
| Cs, H
|
| {{unbulleted list
| National Physical Laboratory of India
| New Delhi, {{IND}}
}}
| |
DOST-PAGASA Juan Time[{{cite web|title=With PST, "Filipino time" is now "on time"|publisher=Department of Science and Technology|url=http://www.dost.gov.ph/index.php?option=com_content&view=article&id=1045:with-pst-filipino-time-is-now-on-time&catid=1:latest&Itemid=150|accessdate=2014-06-07}}]
|
|
|
| {{unbulleted list
| Department of Science and Technology
| Taguig, {{PHL}}
}}
| |
Caesium clocks, Hydrogen Maser [{{cite web|title=Time Standard|publisher=Indonesian Institute of Sciences|url=http://time.kim.lipi.go.id/|accessdate=2016-06-22|archive-url=https://web.archive.org/web/20160121032824/http://time.kim.lipi.go.id/|archive-date=2016-01-21|url-status=dead}}]
|
| Cs
|
| {{unbulleted list
| Indonesian Institute of Sciences
| Jakarta, {{IDN}}
}}
| |
SOC: Space Optical Clock breadboard (Sr lattice clock)[{{cite web|title=Space Optical Clock|publisher=Institut für Experimentalphysik, Heinrich-Heine-Universität Düsseldorf |url=http://www.soc2.eu |accessdate=2017-01-30}}]
|
| Sr lattice
|
|{{unbulleted list|European Space Agency|Düsseldorf, Germany|Braunschweig, Germany|Birmingham, United Kingdom|Paris, France|Florence, Italy|Turin, Italy|Prague, Czech Republic}}
| 100px |
Deep Space Atomic Clock[{{cite news|url=http://www.jpl.nasa.gov/news/news.php?feature=4567|title=Deep Space Atomic Clock|work=NASA's Jet Propulsion Laboratory|publisher=NASA|date=27 April 2015|accessdate=2015-10-28 }}]
| 2019-2021
| Hg ion
|
| {{unbulleted list
| Jet Propulsion Laboratory
| La Cañada Flintridge, California
| {{USA}}
}}
| |
Caesium atomic clocks[{{cite web|title=Uruchomiono najdokładniejszy zegar atomowy w Polsce. Nie straci nawet sekundy przez 200 mln lat|publisher=wyborcza.pl |url=http://wyborcza.pl/7,75400,21304425,najdokladniejszy-zegar-atomowy-w-polsce-juz-dziala-po-200.html|accessdate=2018-03-24}}]
|
| Cs
|
| {{unbulleted list
| Laboratorium Czasu i Częstotliwości (CBK PAN)
| Borówiec, {{POL}}
}}
| |
