为了补偿晶体振荡器的频率受环境温度影响而产生的变化,用可编程函数发生器产生校正信号——校正信号的数值是温度的二次或三次函数(取决于振荡器所选用的石英晶体的切割类型),将它馈送给石英晶体振荡电路中的可调阻抗,以抵消晶体振荡器频率的热变化。 To compensate for changes in crystal oscillator frequency due to ambient temperature effects, a calibration signal is generated using a programmable function generator - the value of the calibration signal is a quadratic or cubic function of temperature (depending on the choice of quartz crystal oscillator Cutting type), feeds it to the adjustable impedance in the quartz crystal oscillating circuit to counteract thermal variations in the crystal oscillator frequency.