The performance of frequency calibrator is directly related to precision transfering frequency standard.
校频仪的性能，直接关系到传递频率标准的精度。
High precision quartz oscillators were used for the transmission of BPV standard frequency and time signals at Shanghai Observatory.
在上海天文台BPV标频和时间信号的发播工作中，使用了高精度石英晶体振荡器。
Waveform distortion of super low frequency standard shaker is an important factor which influences the calibration precision.
波形失真度是影响超低频振动计量校准精度的重要因素。
Phase comparison is a high precision comparing method for frequency standard.
比相法是一种高精度的频标比对方法。
Phase comparison is a high precision comparing method for frequency standard.
比相法是一种高精度的频标比对方法。
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