Zobrazeno 1 - 10
of 40
pro vyhledávání: '"T. Mansten"'
Publikováno v:
2012 European Frequency and Time Forum.
The Finnish realization of coordinated universal time, designated UTC(MIKE), is derived from a single active hydrogen maser at the Centre for Metrology and Accreditation (MIKES). The frequency of a hydrogen maser typically drifts with time, leading t
Autor:
J. Manssila, U. Koivula, T. Mansten, H. Isotalo, Jorma Manninen, E. Leinonen, R. Nyblom, H. Koivula, T. Meriläinen, M. Kari, K. Riski, Jari Kortström, J. Nissilä, J. Muttilainen, J. Sarilo, Antti Lassila
Publikováno v:
Lassila, A, Kari, M, Koivula, H, Koivula, U, Kortström, J, Leinonen, E, Manninen, J, Manssila, J, Mansten, T, Meriläinen, T, Muttilainen, J, Nissilä, J, Nyblom, R, Riski, K, Sarilo, J & Isotalo, H 2011, ' Design and performance of an advanced metrology building for MIKES ', Measurement, vol. 44, no. 2, pp. 399-425 . https://doi.org/10.1016/j.measurement.2010.10.013
Fundamental metrology is closely linked to the development of science and needs good facilities to achieve low measurement uncertainty in demanding experiments. The laboratories must have good temperature stability, low vibration level, good electrom
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8ab272554ac18c348aa3e5e2cdf7f69d
https://cris.vtt.fi/en/publications/3ceb2bfd-27d0-4951-81a7-76d62f6432c3
https://cris.vtt.fi/en/publications/3ceb2bfd-27d0-4951-81a7-76d62f6432c3
Autor:
T. Mansten, K. Lind, Umberto Pogliano, Valter Tarasso, Gert Rietveld, M. Garcocz, Bostjan Voljc, Vera Novakova Zachovalova
Publikováno v:
CPEM 2010.
This paper gives a survey of the performance of existing current shunts designed by National Metrology Institutes (NMI's) around Europe. Key characteristics for power measurement; phase displacement, ac-dc transfer difference and power coefficient of
Publikováno v:
EFTF-2010 24th European Frequency and Time Forum.
Local time in the Centre for Metrology and Accreditation is derived from our master clock, a hydrogen maser. An often occurring phenomenon in hydrogen masers is a small, approximately constant frequency drift. As a consequence, the time error of a hy
Publikováno v:
2009 IEEE International Frequency Control Symposium Joint with the 22nd European Frequency and Time forum.
The most important feature of GPS-receivers in time keeping is long-term phase stability and reliability. MIKES and Nokia have studied in cooperation the performance of medium price commercial GPS receivers both in the short term and long-term sense.
Autor:
Ville F. Maisi, A. Kemppinen, J. Kaasalainen, J. Nissila, K. Ojasalo, T. Mansten, Antti Manninen
Publikováno v:
Nissilä, J, Maisi, V F, Kaasalainen, J, Ojasalo, K, Kemppinen, A, Mansten, T & Manninen, A 2008, Development of a square-wave based AC Josephson system for AC voltage metrology . in Proceedings of the 2008 Conference on Precision Electromagnetic Measurements Digest . IEEE Institute of Electrical and Electronic Engineers, CPEM Digest (Conference on Precision Electromagnetic Measurements), pp. 50-51, 2008 Conference on Precision Electromagnetic Measurements Digest, CPEM 2008, Broomfield, CO, United States, 8/06/08 . https://doi.org/10.1109/CPEM.2008.4574647
A square-wave based AC Josephson apparatus is under development at MIKES. A new high-resolution custom made sine wave source has been developed and is being tested. A simple scheme for calibration of thermal converters (TC) with an AC Josephson syste
Publikováno v:
2007 IEEE International Frequency Control Symposium Joint with the 21st European Frequency and Time Forum.
A significant challenge has been existed concerning the relationship between the manufacturing costs and the high performance of the handheld GNSS terminals. The crystals of the oscillators represent one the most expensive component in the terminals
Publikováno v:
Kalliomäki, K, Mansten, T & Rautiainen, A 2007, Feasibility of DCF 77 or NTP-time servers to control carrier frequencies of base stations . in 2007 IEEE International Frequency Control Symposium and Exposition . IEEE Institute of Electrical and Electronic Engineers, Joint Conference of the IEEE International Frequency Control and the European Frequency and Time Forum, vol. 21, pp. 865-867, 2007 IEEE International Frequency Control Symposium and Exposition, Geneva, Switzerland, 29/05/07 . https://doi.org/10.1109/FREQ.2007.4319201
We studied how to control the frequencies of those simple crystals used in typical telecommunication transmitter. According to the common standards, the uncertainty of carrier frequency should be less than 0.3 ppm. That of simple XO is only 100 ppm.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cb65f4cfdcd16886c488b29c30ead4e8
https://cris.vtt.fi/en/publications/bbeb5f6e-0d70-4ca0-9ec3-86782f050ae7
https://cris.vtt.fi/en/publications/bbeb5f6e-0d70-4ca0-9ec3-86782f050ae7
Publikováno v:
18th European Frequency and Time Forum (EFTF 2004).
The Finnish Centre for Metrology and Accreditation (MIKES) has two HP 5071A Cs-beam standards (standard version from 1997 and high stability version from 2000) and one CH1-76 Passive hydrogen maser (since February 2003). A special four-channel phase
Publikováno v:
18th European Frequency and Time Forum (EFTF 2004).
Long-term phase stability of GPS receivers is important in time-keeping applications. MIKES and Nokia Mobile Phones have studied in co-operation the performance of medium price commercial GPS receivers both in the short term and long-term sense. MIKE