Veale, R.; Reeve, C.

NBS Internal Report 74-601; 21p. November 1974.

Keywords:
Angle block; between time variation; calibration; measuring system; stability; standard deviation; statistical analysis.

Abstract:
The National Bureau of Standards is often asked how frequently a set of angle blocks should be calibrated. In order to provide a basis for answering that question, a survey was made of the long-term stability of several sets of angle blocks over a ten-year period. Data is given concerning the short-term and long-term variability of the measurement process as well as the observed long-term slope of the computed values. The conclusion is that a significant long-term variation in the measurement system does exist, but the long-term slope of the blocks which were surveyed is not significantly different from zero.

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