Accession Number : AD0445235


Title :   A TUBULAR CAPACITOR OF STABLE VALUE


Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF APPLIED PHYSICS


Personal Author(s) : Kanno, M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/445235.pdf


Report Date : 14 May 1964


Pagination or Media Count : 18


Abstract : Very high precision measurements of capacitance have been achieved by recent developments of transformer bridge techniques. Reference capacitors for use with these bridges must be very stable with time and temperature, as well as having other superior characteristics, all of which are very difficult to achieve with the usual mechanical assembly of conductors. This new capacitor uses fused quartz or pyrex glass tubing simply as a support for deposited metallic electrodes, and results in capacitance values of 1 pF which are stable to within one part per million (p.p.m.) for at least six months. They have a temperature coefficient of less than 3 p.p.m./degree C, a voltage coefficient of less than 1 p.p.m. for applied voltages from 10 volts to 100 volts, and stability of 1 p.p.m. after free-fall drops from 10-cm heights. It is anticipated that a capacitor of this style will prove to be very usefull as a transportable standard of capacitance.


Descriptors :   *CAPACITORS , STABILITY , CANADA , GLASS , OXIDES , ELECTRODES , SILICON COMPOUNDS , PLATING , REPRINTS , PIPES


Subject Categories : Electrical and Electronic Equipment


Distribution Statement : APPROVED FOR PUBLIC RELEASE