Regensburg 2004 – scientific programme
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VA: Vakuumphysik und Vakuumtechnik
VA 2: Vakuummessung
VA 2.3: Talk
Monday, March 8, 2004, 11:30–11:50, H47
A new dynamic-flow-high-vacuum-standard designed in CR — •Ladislav Peksa1, Petr Repa1, Tomas Gronych1 und Jiri Tesar2 — 1Charles University Prague, V Holesovickach 8, CZ18000 Praha 8, Czech Republic — 2Czech Institute of Metrology (CMI), Okruzni 31, CZ63800 Brno, Czech Republic
A new high vacuum standard based on the dynamic flow principle is designed in Common Laboratory of the Czech Institute of Metrology and Charles University, CR. A classic one-step-expansion arrangement with a cylindrical chamber divided by the orifice plate into two chambers was chosen. The orifice has the spherical-geometry-channel but with one sphere only in contrast to the most common NPL orifice. A stable turbomolecular pump of medium pumping speed was used; its pumping speed was measured by the AVS recommended orifice method and its value is involved in the Seff-calculation. The flowmeter based on constant pressure principle is a part of the standard. An electronically driven "dry" welded bellows is used as the volume varying element. Its parameters were tested.