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
Bibliography
Standards and norms
French Standards Association (AFNOR)
- Measuring instruments – Steel brackets. - NF E 11-103 - 1983
- Instruments de mesurage des angles. Généralités. - NF E 11-300 - 1986
- Instruments de mesurage des angles. Niveaux à bulle. - NF E 11-301 - 1984
- Instruments de mesurage des angles. Niveaux électroniques. - NF E 11-302 - 1984
- Instruments de mesurage des angles. Autocollimateurs. - NF...
Directory
Manufacturers – Suppliers – Distributors
AG Davis – AA Gauge (divider plate)
http://www.agdavis-aagage.com/a_rotary_tables.htm
Brown and Sharp TESA (corner shims)
...
Websites
BIPM: Calibration and measurement capabilities: CMCs (Appendix C) http://kcdb.bipm.org/appendixC
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