# \#zeeman-effect

**URL:** https://scanalyst.fourmilab.ch/tag/zeeman-effect/3134.md

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## [Getting the Utmost Accuracy from an Atomic Clock with the Zeeman Effect](https://scanalyst.fourmilab.ch/t/getting-the-utmost-accuracy-from-an-atomic-clock-with-the-zeeman-effect/2231)

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**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\
**Replies:** 0\
**Last updated:** [1 November 2022 12:37 UTC](https://scanalyst.fourmilab.ch/t/getting-the-utmost-accuracy-from-an-atomic-clock-with-the-zeeman-effect/2231 "2022-11-01T12:37:29Z")

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The Hewlett-Packard 5061A Cesium Beam Frequency Standard was, for decades, the most accurate commercially-available clock. A bank of these units served as the primary time standard for the U.S. and many ot…