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1980年4月,中国计量科学研究院与国际计量局进行了甲烷稳定激光器、碘稳定激光器的比对。比对结果为:甲烷稳定激光的平均频差为+0.56千赫(相当于+6.4×10~(-12))、标准偏差为±1.29千赫(相当于±1.5×10~(-11));碘稳定激光的平均频差为+13.8千赫(相当于+2.9×10~(-11))、标准偏差为±4.5千赫(相当于±0.95×10~(-11))。
In April 1980, China Institute of Metrology and International Bureau of Metrology compared methane stabilized lasers and iodine stabilized lasers. The result of the comparison is that the average deviation of methane-stabilized laser is +0.56 kHz (equivalent to + 6.4 × 10 ~ (-12)) and the standard deviation is ± 1.29 kHz (equivalent to ± 1.5 × 10 ~ (-11) ). The average deviation of iodine-stabilized laser was +13.8 kHz (corresponding to + 2.9 × 10 ~ (-11)) with a standard deviation of ± 4.5 kHz (equivalent to ± 0.95 × 10 ~ (-11)).