GLASS-HOLDER RELIABILITY STUDY.
Final rept., 1 Apr 63-30 Sep 64,
BLILEY ELECTRIC CO ERIE PA
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A one-year reliability study on glass crystal holders HC-26U, HC-27U, and HC-30U was conducted. Sealed holders were examined for cracks, subjected to thermal shock, and checked for vacuum retention at monthly intervals. Yield figures and findings from the monthly tests are presented by holder type, by supplier, and by mode of failure. Reliability curves are also presented, showing the failure rates in percent per thousand hours by holder type and supplier. HC-30s maintained a 0 failure rate throughout, HC-27s averaged about 5 loss per thousand hours at the beginning but reached less than 1 loss by the end, while HC-26s ranged between 3 and 4 loss per thousand hours throughout the one-year study. Author