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Erschienen in:
1973 | OriginalPaper | Buchkapitel
Comparison Methods
verfasst von : B. A. Gregory
Erschienen in: An Introduction to Electrical Instrumentation
Verlag: Macmillan Education UK
Enthalten in: Professional Book Archive
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The methods described in this chapter could, as an alternative, have been termed ‘null methods’; the measurement process being to reduce the difference between a known and an unknown quantity to zero, that is, a null would be indicated. Such methods have inherently a greater precision than direct measurements, for example, by such methods it is possible to compare two voltages of the order of 1 V using a detector that has a resolution in terms of microvolts. The accuracy of such methods must, however, depend on the limits of error that apply to the particular ‘standard’ quantity.