多年来使工程师和科学家感到棘手的问题是石英晶体谐振器在激励电平超过10～100微瓦时所引起的明显的频率偏移这个很不需要的特性。这种现象哈蒙德(Hammond)已经作了介绍。通常为了避免这种现象,只有使所有精密的、中等精密的石英振荡器都尽量在低的激励下工作。然而,作者发现,石英谐振器的这种 The problem that has been troublesome for engineers and scientists over the years has been the unwanted nature of the crystal oscillator’s apparent frequency shift at excitation levels in excess of 10 to 100 microwatts. This phenomenon has been introduced by Hammond. Usually to avoid this phenomenon, only make all precision, medium precision quartz oscillators try to work with low excitation. However, the authors found this kind of quartz resonator