PRODUCTION ENGINEERING MEASURE QUARTZ CRYSTAL UNITS CR-(XM-40)/U (2.5 MC HIGH PRECISION).
Quarterly progress rept. no. 7, 1 Dec 62 28 Feb 63,
BLILEY ELECTRIC CO ERIE PA
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A description is presented of the successful performance of the exact aging test prescribed by the CR-XM-40U specification evaluation of daily aging rates by means of consecutive, daily readings. Sample units have been shown to have aging rates of less than 5 parts in 10 billion per day after three weeks. This confirms our previous conclusion, based on computation of daily aging rates as average values, that the sample units met the requireme that only the test method was deficient. A curve is presented showing that the BG11AH-5 crystal which is being used as a reference did not change more than 2 parts in 10 billion per day, as measured against a Sulzer 5A standard, and that the maximum changes between the two standards did not exceed 3 parts in 10 billion during a 24-day period. Curves are also presented showing that the aging rates of sample units, properly temperature controlled, are will within the permitted 5 parts in 10 billion per day. Author