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The Physikalisch-Technische Bundesanstalt (PTB) is the National Metrology Institute of the Federal Republic of Germany with scientific and technical service tasks. It is a higher federal authority and a public-law institution directly under federal government control, without legal capacity, under the auspices of the Federal Ministry for Economic Affairs and Energy. == Tasks == Together with NIST in the USA and the NPL in Great Britain, PTB ranks among the leading metrology institutes in the world. As the National Metrology Institute of Germany, PTB is Germany's highest authority in terms of correct and reliable measurements. The Units and Time Act Questions about time )〕) By order of PTB, the synchronization of clocks via radio is performed via the time signal transmitter DCF77 operated by Media Broadcast. Computers which are connected with the Internet can obtain the time also via the three public NTP time servers of PTB.〔(NTP time servers of PTB )〕 In Berlin-Adlershof, PTB operates the MLS (Metrology Light Source) electron storage ring for calibrations in the field from the infrared (THz) to the extreme ultraviolet (EUV). Department Q.5 ""Technical Cooperation"" realizes projects of the German and international development cooperation in the field of quality infrastructure. These activities promote competitiveness as well as environmental protection and consumer protection in developing countries and in countries in transition.〔(Technical Cooperation )〕 One of the tasks of PTB’s "Metrological Information Technology" Department – in accordance with the German Gambling Ordinance (( § 11 ) ff. SpielV) – is to grant type approvals for gaming machines which offer the possibility to make winnings. Also, according to the Federal Ordinance on Voting Machines, PTB is in charge of the type approval of voting computers.〔(Federal Ordinance on Voting )〕 This is, however, irrelevant as, in a judgment of 3 March 2009,〔(Federal Constitutional Court )〕 the Federal Constitutional Court has declared the use of such voting machines to be inadmissible. Weapons which may be carried with the Minor Firearms Certificate, i.e. weapons for shooting blanks or irritants and weapons used as signaling devices, require a PTB test mark for their approval. Occasionally, these weapons are also jointly referred to as "PTB weapons" and bear the PTA or PTB proof mark F (see also: Act on the Proof Testing of Arms and Ammunition). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Physikalisch-Technische Bundesanstalt」の詳細全文を読む スポンサード リンク
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