To solve the calibration problem of digital clock,the calibration methods and system were discussed.The calibration items of instant time offset,1PPS time offset,frequency offset and daily time offset are given.Calibration method of instant time offset is described in detail.According to the instant time offset,the uncertainty of the instant time offset is evaluated,and the calibration software of instant time offset is written to automatically extract jump frames,calculate error and record data.The experi-mental results show that the expanded uncertainty of instant time offset is 1 ms(k=2)while the resolu-tion of standard digital clock is 1 ms.
digital clockinstant time offsetcalibration methoduncertainty
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