10.6.2.2 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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