PTB-News 2003.2

High-accuracy optical frequency standard National traceability network for chemical analytics Measurement of ultrashort oscilloscope risetimes International Awards for Andreas Bauch and Ekkehard Peik Redefinition of the temperature unit? Virtual CMM in use in industry PTB time service prolonged

Imprint PTBnews 03.2 English edition August 2003 Published by Physikalisch-Technische Bundesanstalt (PTB) Braunschweig and Berlin · Germany

Chief Editor Jens Simon PTB, Bundesallee 100 D-38116 Braunschweig phone: (+49 531) 592-30 06 fax: (+49 531) 592-30 08 e-mail: ptbnews@ptb.de