Quartz crystal resonator G-sensitivity measurement methods and recent results

The results were obtained for 40- and 50-MHz, fifth-overtone AT-cut and third-overtone SC-cut crystals. Acceleration sensitivity (gamma vector) values for the SC-cut resonators (5×10^-10 per g) were typically four times smaller than for the AT-cut units. However, unit-to-unit gamma vector magnitude and direction uniformity was much better for the AT-cut devices. Oscillator signal frequency modulation levels resulting from vibration of the 50-Ω modular amplifier TO-8 sustaining stage were significantly lower than the 5×10^-11 per g value due to cable vibration. Effects of connecting coaxial cable vibration are determined by measurement of differences in (1) the vibration-induced FM sideband level, and (2) the accelerometer output/FM sideband phase relationship obtained by inverting the position of the device on the shake table