Note on Atomic Time Keeping at the National Research Council

Details Note on Atomic Time Keeping at the National Research Council Note on Atomic Time Keeping at the National Research Council

Jul 1969

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969metro...5...73m&link_type=abstract

Metrologia, Volume 5, Issue 3, pp. 73-76 (1969).

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Scientific paper

Three different experimental atomic time scales have been maintained at the National Research Council of Canada. One has been based on an HP 5061A cesium standard, another on a free-running crystal oscillator, calibrated daily with respect to the NRC 2.1 m primary cesium standard, and a third on the HP 5061A calibrated weekly by the primary standard. VLF and Loran C intercomparisons with the United States Naval Observatory and the National Bureau of Standards indicate that the third is probably the most accurate of the three time scales. Agreement between this scale and those of the USNO and NBS is of the order of 1 μsec or 1 × 10-13 in frequency over a four-month period.

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