Titlebook: An Introduction to Electrical Instrumentation; A guide to the use, B. A. Gregory Textbook 1973Latest edition B. A. Gregory 1973 electrical

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Comparison Methods,e 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

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殘忍

diathermy

Harness

Errors in Measurement,measurement in relation to a standard or absolute value. Thus a system of comparisons must be established whereby any measurement made can be related to the standard value. Figure 7.1 gives a possible chain of relationships by which everyday measurements in electrical quantities may be evaluated in

Pastry

Transducers,ce that converts a mechanical variable into an electrical one, for example a tachogenerator, or it may be capable of converting an electrical signal into a mechanical one, for example a galvanometer. Commercial usage of the term is generally accepted as meaning a device that converts a physical phen

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MOT

Instrument Selection and Specifications,ument from those within a department or establishment to perform a particular measurement, or he is undertaking the purchase of a new instrument to perform a particular measurement and possibly at the same time extend the measurement capabilities of the department or establishment in which he works.

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