The calibration of angle blocks by intercomparison
Abstract
The calibration of angle blocks at the National Bureau of Standards is described. Test blocks normally come in sets of 16 nominal sizes from 1 second to 45 degrees. Their angular values are calibrated by intercomparison with NBS master angle blocks and other test blocks of the same nominal size. Each test block is also measured for its maximum outofflatness and outofsquareness. Statistical tests are performed in order to maintain control over the short term and long term variability of the measurement process. A complete description of the measurement process is given with special attention paid to the mathematical model for the measurements and the least squares estimation of the angular values. The method for determining the standard deviations of the short term and long term errors is also given.
 Publication:

Final Report National Bureau of Standards
 Pub Date:
 April 1980
 Bibcode:
 1980nbs..reptQ....R
 Keywords:

 Angles (Geometry);
 Blocks;
 Calibrating;
 Standards;
 Fizeau Effect;
 Flatness;
 Least Squares Method;
 Mathematical Models;
 Squares (Mathematics);
 Statistical Tests;
 Engineering (General)