CAN BE ESTIMATED THE MEASUREMENT UNCERTAINTY OF DAQ SYSTEM FROM DATA SHEETS OF USED A/D MODULES?
Vladimir Haasz
Abstract:
The estimation of a measurement uncertainty of a sampled signal based on parameters of A/D modules published in data sheets is not already trivial. When a very low frequency (pseudo-static) signal is sampled, the static parameters, which are usually published by well-known producers can be used for this purpose. The more complicated situation arises in the case of a dynamic measurement, when the most of producers present only minimum of parameters. It is usually the total harmonic distortion (THD), or the analogue bandwidth for low and/or full scale signal. The most important dynamic parameters as the effective number of bits (ENOB), or the signal to noise and distortion (SINAD) including their frequency dependence are published very seldom.
