Using modular DAQ systems, the precision of measurement depends not only on the quality of an AD module used, but also on the influence of disturbances. Therefore, before defining standards both for adequate EMC conditions in DAQ system cases and for the disturbance immunity of plug-in AD modules, suitable methods have to be designed and a number of measurements are to be executed. To prepare the knowledge for it, the following investigation has been made until now: 1. design and verification of methods which allow the measurement of disturbing influences in DAQ systems 2. design of methods for determination of disturbance immunity of AD modules and realisation of relevant equipment, a number of measurements were made 3. definition of a disturbance immunity factor to compare the disturbance immunity of different types of AD modules.
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