Production Engineering Measure. Cr-(XM-45) /U Quartz Crystal Units (Ruggedized, Low-Frequency)

摘要

The CR-(XM-45) /U are ruggedized, low-frequency quartz crystal units. They are able to withstand severe vibration; 10 to 2,000 cps at 15-G acceleration. The report describes the preproduction phase of the project. Details of the designs for units at 90 KC, 150 KC, and 200 KC are given, as well as outlines of the fabrication techniques. Data from the preproduction tests of specification MIL-C-3098C are presented for 30 units; 10 of each frequency. Evaluation of the data indicates that the stringent vibration requirement was met, performance levels were directly comparable to those of the regular CR-42A units, capacitance values were well within the new requirements (about 3.5 pf higher than for CR-42A's), and resistance values were well under the 7,500-ohm maximum. (Author)