Wüest M. 51 Wykes M. 82 Yamaguchi M. 17 Ybarra G. 129 Yubero F ...
Wüest M. 51 Wykes M. 82 Yamaguchi M. 17 Ybarra G. 129 Yubero F ...
Wüest M. 51 Wykes M. 82 Yamaguchi M. 17 Ybarra G. 129 Yubero F ...
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
JUNE 26 MONDAY MORNING<br />
WS-18-MoM-INV.2<br />
Metrology<br />
VACUUM STANDARDS AT CEM. C. Matilla. Spanish Centre of<br />
In the next future CEM will have three different vacuum standards to cover all the vacuum range.<br />
These standards are a dynamic expansion system, a static expansion system and a forced balance piston<br />
gauge. The dynamic expansion system is based on the known orifice flow technique in which a<br />
flowmeter is used to generate a known flow rate of gas in a vacuum chamber partitioned by an orifice<br />
of calculated conductance. It has been working for some years but it has suffered several modifications<br />
to make it more accurate. The forced piston balance is a recent acquisition. It is a pressure<br />
standard designed to cover the range from less than 1 Pa to 15 kPa gauge and absolute pressures. The<br />
instrument operates on the piston gauge principle in which the pressure on the piston is measured by<br />
a forced balanced load cell. We were encouraged to acquire it by the good results obtained by other<br />
metrology institutes. At the moment we are testing its performance and we are satisfied with its results.<br />
The static expansion system is based on Boyle´s law with corrections. It is a project in collaboration<br />
with EUITT (UPM), which has been founded by the R&D National Plan. This project will be<br />
finished in 2008.<br />
32
Change language