PRODUCTION ENGINEERING MEASURE FOR TYPE CR-(XM-60)/U CRYSTAL UNITS.
Quarterly rept. no. 6, Oct-Dec 65,
BULOVA WATCH CO INC WOODSIDE N Y ELECTRONICS DIV
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The new Kold-Weld holders were utilized in a 20 unit crystal group now under test. Evaluations will be made at the end of the test. Thermo-compression bonding had been abandoned early in the program in favor of ultrasonic welding. Efforts, however, will be resumed if ultrasonic welding does not prove practical. The re-evaluation of the reliability data uncovered some serious questions concerning the drive levels of the units under test. The CR-XM-60U units to be manufactured are expected to have much lower resistance values than the present CR-47AU units, because of process improvements including primarily, the evacuation of the Kold-Weld holders. Under these conditions, the drive levels may very well be in excess of five times the specification, a factor contributing to an increased aging rate, and perhaps, a poorer reliability rate than that of the CR-47AU units. Author
- Electrical and Electronic Equipment
- Manufacturing and Industrial Engineering and Control of Production Systems