It generates time standard signal using crystal oscillator, here is the quartz crystal oscillator.
用晶体振荡器产生时间标准信号，这里采用石英晶体振荡器。
2
The output of the oscillator can be used as a standard signal for calibration of the differentiator to employ in research on the transformation of physiological pulse wave forms in medical science.
电路输出可以作为标准信号，用来校准医用微分器，作生理电脉冲波形变换的研究。
3
Voltage controlled crystal oscillator (VCXO) plays an important roll in the atomic frequency standard.