【摘要】 频率标准源可以提供精确的标准频率,在测定频率标准源的各项性能指标时,要求测试系统必须具有很高的比对精度。所设计的频率标准比对系统采取多级倍频 混频方式使频率偏差逐级扩大后再测量,从而避免了直接进行高次倍频的困难,提高了测量精度,可以对高精度的频率标准的准确度、长短期频率稳定度进行快速测量,是一种高精度时畴参数测量系统。更多还原

【Abstract】 Frequency standards can provide precise standard frequency.On measuring the functions of frequency standards,high comparison accuracy is needed in the testing system.Multiorder multiplyingmixing is adopted in the designed comparison system to increase the frequency deviation that can be measured.With this highly precise time domain measuring system,the problem of performing direct highdegree multiplying is solved and the measuring accuracy is improved.The accuracy and short or long term stability of frequency standards can be quickly measured.更多还原