Breviary Technical Ceramics



 Control Cards

Figure 233: Distinctions between control cards

Control cards are graphical representations of measured values with respect to time, whereby the intervention boundaries are calculated from the sequence of measurements and are displayed as a line. They function as an aid to decision for operators for further process control. New measurement values are entered, interpreted immediately and corresponding comments, for example, relating to changes or interventions, are noted.

Combined control cards for measurement values are of particular importance in the industrial context, above all the mean x card combined with the variation range R or the standard deviation s cards. R is an abbreviation for "range ".


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