PRODUCTION ENGINEERING MEASURE: QUARTZ CRYSTAL UNITS CR-(XM-45)/U (HIGH SHOCK AND VIBRATION RESISTANT, LOW FREQUENCY)
Abstract
Development of high shock and vibration resistant low frequency quartz crystal units was continued. The CR-(XM-45)/U crystal units are similar to standard CR-42A/U units except that the new units must withstand much more severe vibration and must also hold much tighter frequency stability over the 70 C to 80 C operating temperature range (OTR). This report presents evaluation data from the second group of experimental units prepared for this project. They gave indications that the new experimental design - which uses special, double-rotated X cut resonators mounted in Bliley's ceramic-frame holders - can be refined to meet the CR (XM-45)/U requirements, provided an increase of 3.5 uuf is made in the specified capacitance values. Attention is now concentrated on im proving the temperature characteristics of the new resonators. Increases in the second rotation angle have no significant changes in peaking points but there are indications that improved drift over the OTR can be obtained by proper placement of the support wires on the ls.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 28, 1963
- Accession Number
- AD0404737
Entities
People
- A. R. Krespan
- J. M. Wolfskill
- Robert Mouck