| Zugriffsnummer | 19866 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Design of a simple thermal control for gas-dielectric standard capacitors |
| Autor(in); Institution |
Kyriazis, G. A.; Instituto Nacional de Metrologia, Normalização e Qualidade Industrial, Duque de Caxias, RJ, BRAZIL
Melcher, Jürgen; 2.1, Gleichstrom und Niederfrequenz, PTB-Braunschweig
|
| Quelle/Jahr | Mediciones confiables para el desarrollo de México : Simposio de Metrología 2006, 25, 26 y 27 de octubre, Santiago de Querétaro, Qro., México ; memorias:(2006) |
| Availability | [CD-ROM] |
| Herausgeber(in) |
Aviles Castro, David
|
| Verlag | Santiago de Querétaro: CENAM |
| Konferenzangaben | Simposio de Metrología 2006, Santiago de Querétaro, 25-27, October, 2006, Mexico |
| Zusammenfassung | A two terminal-pair coaxial capacitance bridge was built recently at Inmetro. It operates mainly at 1 kHz and 1.592 kHz and compares decadic capacitors in the range from 10 pF to 1 nF at the ratios 1:1 and 10:1 and 1:10, with an uncertainty of about one part in 108. The 1 nF standard capacitors commercially available are made from invar with gas dielectric. Such capacitors have a temperature coefficient of (0 ± 2) μF/F per K. This is too high if one plans to use them in a traceability chain to derive the capacitance unit from the quantum Hall resistance. The design of a simple thermal control for gas-dielectric capacitors to reduce by two orders of magnitude their temperature variation is presented here. |
