PRODUCTION ENGINEERING MEASURE. CR-(XM-53)/U, QUARTZ CRYSTAL UNITS.
Quarterly rept. no. 6, Mar-Apr 66.
BLILEY ELECTRIC CO ERIE PA
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Although sample CR-XM-53U crystal units have been able to meet the stated CR-XM-53U requirements, neither sealing yields nor reliability levels attain the values which are possible. The difficulty has been that cracking andor leaking of the HC-27 glass holders detracts from the performance of the units. Investigations were made to find methods of reducing these losses, preferably without making changes in the designs of the crystal resonators or the holders. The cracking problem can be alleviated by annealing the units after sealing, but no method yet investigated has been satisfactory for use on the CR-XM-53U. The leaking problem can be minimized by using a penetrant-dye test to detect those HC-27 bases which have defective glass-to-metal seals, even before sealing. Use of this technique has significantly improved both sealing yields and reliability performances.
- Electrical and Electronic Equipment
- Ceramics, Refractories and Glass