GLASS INCLOSED CRYSTAL UNITS CR-(XM-31)/U.
Abstract
Problems and solutions encountered in design fabrication and testing of the CR-(XM-31)/U crystal unit discussed under Section I. Also included is economic information comparing cost factors of metal versus glass holder packaging. In Section II, data obtained in performing various tests on a total of 225 units is presented. Processing details for fabricating the CR-(XM-31)/U crystal unit is outlined under Section III. Section IV consists of a Quality Control and Inspection Plan. The CR-(XM-31)/U, basically a CR-61/U in the HC-26/U holder, is considered a relatively easy specification to meet in the HC-26/U holder; particularly since the frequency tolerance over 85 =5 degrees C is 20 ppm. A frequency tolerance of =10 ppm, 85 =5 degrees C, could be achieved with satisfactory yields. However, from experience, the unit cost would be approximately 50% higher. In utilizing the HC-26/U holder over an HC-18/U crystal unit, costs are greater. The glass HC-26/U holder should find application wherever reliable seals and resultant long-term stability are important factors.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1965
- Accession Number
- AD0613354