4. Principle of angular sector measurement
As stated in the introduction, the angular reference, at the highest level of a calibration chain, is not necessarily a "primary material" standard, but can be embodied in a laboratory's ability to divide a revolution precisely.
Some of the references presented in § 3 call on the principles set out below, either in their operating mode or in the context of monitoring operations.
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Principle of angular sector measurement
Measuring small angles
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