METHODS FOR LOW POWER TEMPERATURE CONTROL.
Final rept. for 2 Jul 62-29 Feb 64,
LITTLE (ARTHUR D) INC CAMBRIDGE MASS
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The methods and devices by which the temperature of a single quartz crystal blank can be maintained at a constant operating temperature in extreme environmental conditions have been investigated. Four types of ovens, in which temperatures are controlled by a snap-action thermostat, were studied 1 a 500-milliwatt oven Type E6 requiring accessibility to the crystal and operating at 75C 2.5C over a -40C to 60C ambient 2 a 50-milliwatt sealed oven Type F6G with similar operating requirements 3 a less costly, 100-milliwatt sealed oven Type G6G with similar operating requirements and 4 a 250-milliwatt oven Type H6 requiring accessibility to a temperature-compensated crystal and operating at 0C3C over an ambient range from -55C to 0C. Five ovens of each type were constructed and successfully tested. The amplitude of the crystal operating temperature oscillation, power consumption and warm-up time are within the required limits for the type E6, G6G and H6 ovens. Power consumption of the type F6G ovens is 50 higher than specified. Author