Optimum structure of a calibration system
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In principle it is feasible to optimize calibration systems on a cost criterion.
Data on the cost of the standards (including installation and operating costs) and data on the number of instruments of various accuracies circulating in the country, the performance of the standard calibrators, and the actual between-calibration periods are essential for the design of optimum calibration systems. Unfortunately, data on the economic factors are lacking to such an extent that it is practically impossible to calculate the optima.
The calculations given here are useful in that they show the effect of different factors on the cost of realizing a calibration system and make it possible to establish certain concrete recommendations: a) error ratios in successive echelons should now be established close to the optimum value; b) in designing a calibration hierarchy it is advantageous to decrease the error ratio between successive echelons, of course maintaining the requirements of accuracy stipulated for the lowest element in the hierarchy; c) for a small number of echelons a variation of the error ratio that may be caused by potentialities of technological realization without essentially increasing the cost of the testing network is allowable; d) the collection and processing of information of an economic character is urged for the calculation of the optimum structure of a standards hierarchy since this would permit planning of the manufacture, the stipulation of technical requirements, and planning of capital expenditures on a scientific basis.
KeywordsPhysical Chemistry Analytical Chemistry Operating Cost Standard Calibrator Optimum Structure
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