NBS Monograph 149; 75p. November 1975.
Measurement algorithm; measurement assurance; measurement process; measurement unit; process variability; uncertainty.
The differences between the methods of traditional metrology and the measurement assurance programs are briefly discussed. The historical data relative to long gage blocks (5 in to 20 in) are analyzed to provide a basis for comparison with results from new measurement processes formulated in accordance with the philosophies of the measurement assurance programs. The results from the new processes are in agreement with the work of the past. The current length values used in the dissemination of length by the National Bureau of Standards. These long blocks are a part of a growing collection of similar well characterized artifact standards for use in comparative measurement processes. The methods and techniques used in developing the new measurement process are discussed in some detail. It is the author's intent that, in addition to the technical content, this paper be largely tutorial in the area of measurement process analysis. This paper is, in essence, a report on the extension of the techniques first suggested in NBS Monograph 103 "Realistic Uncertainties and the Mass Measurement Process" to the area of length measurement