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The required accuracy was defined by the detector experts for each data point type (see here). Obviously, it can not be samller tha the measurment precission given by the usual fluctuation of a variable. The deadband has to be set between these two values.
Past Projects
We provided a tool to monitor the time dependence of important data points in the form of daily trends. The first step is to query the DCS database and extract the relevant information. This is then plotted as a function of time. Related quantities such as the temperature of all the modules on a stave are plotted on the same plot. And related plots, such as the voltage plots for the entire pixel detector, are collected into one single web page. This hierarchical layout can be specified in a simple text file.