PRODUCTION ENGINEERING MEASURE. CR-(XM-45)/U QUARTZ CRYSTAL UNITS (RUGGEDIZED, LOW FREQUENCY).
Quarterly progress rept. no. 6, 1 Sep-1 Dec 63.
BLILEY ELECTRIC CO ERIE PA
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The CR-XM-45U crystals are ruggedized units in the 90-Kc to 200-Kc frequency range. The original requirements were that these units have much more stringent temperaturefrequency stability than the standard CR-42A units of specification MIL-C-3098, as well as have the ability to take 10-cps to 2,000-cps, 15-G vibration. It proved to be impossible to meet the original requirements the ruggedized CR-XM-45U units could not attain tighter temperature-frequency stability than the 0.002 demanded of the non-ruggedized CR-42As. Investigation was made to determine realistic requirements which could be met by units which were able to meet the new vibration requirement. It was found that the rugged units could be made to meet the same performance levels as the non-rugged CR-42AU units, provided an additional 3.5-pf capacitance were permitted and a maximum resistance value of 7,500 ohms were allowed. Author