QUARTZ CRYSTAL APPLICATIONS 



199 



Z _J 



o ± 



z 



u </) 



a cr 



ui < 



(£ Q. 



10 20 30 40 50 60 70 80 

 TEMPERATURE IN DEGREES CENTIGRADE 



90 100 MO 120 



Fig. 1.18 — Temperature frequency characteristic for GT crystal 



JsJ -so 



^ -30 





 -40 



VALUE OF m 

 100 90 80 



40 



•V 



-20 -10 +10 +20 +30 



ANGLE OF ROTATION AROUND THE X AXIS 



Fig. 1.19 — Temperature coefficients of long thin rotated X cut crystals. Angle of 

 rotation measured between length and V axis. Dots are measured points. Solid line 

 calculated from temperature coefficients evaluated in the appendix. 



