The Federal Standards Laboratory
the Federal Standards Laboratory (PTB), Braunschweig and Berlin, is national metrology - Institut of the Federal Republic of Germany with scientific-technologic tasks of service, federal waiters an authority and federaldirect, not-legally responsible institute of the public right in Division of the Federal Ministry for economics.
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Die Bundesanstalt vertritt die Bundesrepublik Deutschland auf den ihr durch Gesetz übertragenen Aufgabengebieten gegenüber Einrichtungen des Auslands und internationalen Organisationen in fachlichen Fragen.
The PTB exists 2006from eight technical-industrial specialized divisions (of it two in Berlin Charlottenburg), subdivided into round 55 specialist areas with round 200 working groups. Their tasks are supplemental the regulation by fundamental and natural constants , representation , retaining and passing on of the legal units of SI, safety engineering,around services like the German calibration service (DKD) and measuring technique for the legally regulated range, the industry as well as transfer of technology. As basis for its tasks the PTB in close co-operation with universities, other research establishments as well as the industry operates basic research and development inRange of the metrology. The PTB employs approximately 1,500 established coworkers. You stand a total budget of approx. 130 millions euro for the order, about which about 7% are in-recruited as third means.
In the time law of 1978 the Federal Standards Laboratory with the spreading becomes thatLegal time in Germany assigns. In order to have for this a time base, it operates several atomic clocks (at present three cesium clocks and since 1999 a cesium Fontäne).
The synchronisation of clocks over radio is made by likewise from the PTB operated long wave transmitter DCF77. With the Internet connected computers can refer the time among other things over the two public NTP - server (ptbtime1.ptb.de, ptbtime2.ptb.de) the PTB.
the PTB became 1887 as physical-technical institute for realm (PTR/PTRA) on initiative and afterIdeas of Karl Heinrich Schellbach, Werner Siemens and Hermann von Helmholtz in Berlin Charlottenburg based. Their task consisted first of, the measurement standardizing weight and time natures in Germany. 1922 were integrated the institute for realm for measure and weight.
During the Second World Warthe arms research took broad area.
For instance starting from 1947 follow-on equipments developed beside the PTR in Berlin Charlottenburg for the east zone in east Berlin as well as in the Bizone and later tri zone. In the tri zone and/or. FRG convenient was called physical-technical institute (PTA) andsince 1. April 1950 the Federal Standards Laboratory; into these 1953 the West-Berliner PTR as department under keeping of the four-power status of Berlin one integrated. In the GDR with head office in Berlin the German office for measure and weight (DAMG) had been established,after several renaming in the last GDR years the name office for standardisation, measurement and goods examination (ASMW) held; the name already suggests that it possessed many more extensive tasks than the PTB of the FRG, i.e. still tasks within the range to that Standardization, the quality assurance and the field of activity of the Federal Institution for material research and - examination (BAM). After the “turn” 1990 parts of the ASMW were transferred to the PTB and to the BAM.
- the appearing twice annual magazine of the PTB of yardsticks can be subscribed free of charge. It contains generally comprehensible contributions approximately around the sizes of physics.
- The addresses for ordering read:
- by post office:
- The Federal Standards Laboratory
- Pressing and public work
- P.o. box 3345
- 38023 Braunschweig
- to Federal Office for metrology and accreditation (Switzerland)
- Federal Office for calibration and surveying (Austria)
- national Physical Laboratory (NPL) (UK)
- atomic time
- of Wikipedia seized (former) coworkers thatPTR/PTB:
Adelsberger, Udo; Bothe, roll ago William George; Gehrke, Ernst;Violonist, Johannes; Gitt, Werner; Goldstein, August; Helmholtz, Hermann Ludwig Ferdinand of; Houtermans, Friedrich George; Keiter, light courage; Kohlrausch, Friedrich; Tell, August; Laue, max of; Lime tree, Carl of; Lummer, smelling pool of broadcasting corporations; Meissner, Fritz walter; Mensing, Karl Adolf Alexander; Nernst, roll ago Hermann; Paschen, Friedrich; Disk, Adolf; Schering, Harald Ernst Malmsten; Strongly, Johannes; Wachsmuth, smelling pool of broadcasting corporations; Being castle, Emil Gabriel;