Electronics

# Electronic components : a complete reference for project by Delton Horn

By Delton Horn

A one-stop resource of useful info on nearly all kinds of digital part and its operating features, necessities, and makes use of.

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Additional info for Electronic components : a complete reference for project builders

Example text

In the differential method the difference of the signal of two sensors is connected to the input of the measuring device. Only one sensor is influenced by measuring quantity, but both sensors are influenced by external temperature. Thus the signals caused by the external temperature are compensated and only the signal caused by measured quantity remains. It is possible to apply the differential method in the bridge circuit. In the circuit presented in Fig. 21. The differential method of reduction of external interferences: a) the bridge circuit, b) the gradient sensor Fig.

26. No wonder that after the Guide the frustration of people active in measurements deepened and the milieu divided to the initiated peoples, who understand the Guide, and the rest, who don’t. A lot of publications explaining the terms from the Guide have been published (Dieck 2002, Lira 2002, Rabinowich 1999, Taylor 1996). The Guide is an official document, as well as standard and law, therefore everyone is obliged to try understand it and to comply with it. Before the Guide the theory of errors was divided into two parts: theory of systematic errors caused by the limited accuracy of the measuring devices and imperfection of mathematical models, and the theory of random errors utilizing the theory of probability.

7) 28 PRINCIPLES OF ELECTRICAL MEASUREMENTS which can be read as follows: the result of measurement X is determined with the dispersion r'X around the true value XT (bearing in mind that r'X is an absolute error of measurement). 8) which should be interpreted as follows: the result of measurement X is determined with the uncertainty r u around the estimated value X0 with the level of confidence (1-D). 8) denotes the probability. We can see that the true value (which we never know) is now substituted by the estimated value.