SOME ASPECT OF STANDARDISATION OF PERFORMANCE CHARACTERISTICS FOR MODULAR DATA ACQUISITION SYSTEMS

Vladimír Haasz, Harald Schumny

Abstract

To estimate the measurement uncertainty using a modular DAQ system, factors influencing the quality of A/D modules have to be determined. While integral and differential non-linearity describes the static quality of an ADC, the effective number of bits or SINAD are typical integral parameters characterising the dynamic quality of an A/D module. The paper analyses how individual disturbing factors and imperfections of the A/D module influence the quality of digitalisation, and how they could be specified for a future standardisation. It is shown that (in the case of a time-variable input signal) the factors mentioned above induce disturbing undesirable components in the digital output and so they influence the value of SINAD of the investigated A/D module.

Keywords

DAQ system, A/D module, standardisation, quality

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IMEKO-TC4-2001-026.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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