lower control limit


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lower control limit

[¦lō·ər kən′trōl ‚lim·ət]
(industrial engineering)
The horizontal line drawn on a control chart at a specified distance below the central line; points plotted below the lower control limit indicate that the process may be out of control.
References in periodicals archive ?
As depicted in Figure 5, all the normal UDP source bytes at all instances are located within the two limits, while the attacking bytes at the aforementioned instances are beyond the lower control limit (LC[L.sub.i]).
Since the structural damages are always reflected as stiffness reduction, only lower control limits of identified stiffness are meaningful for damage classification.
The charts support visual monitoring of the process performance against established attendance and knowledge acquisition targets with statistically derived upper and lower control limits. Each time a sample proportion or mean plots outside the control limits an out-of-control condition is identified indicating that the educational service delivery process is no longer operating as designed.
Comparing the ISRT p-chart with several known p-charts, the minimum sample sizes required for obtaining positive lower control limits for the ISRT p-chart are small.
One of the interesting results in this context is provided by Proposition 4 and Corollary 2 which suggest that optimal sample size and upper and lower control limits of the [Mathematical Expression Omitted] chart are independent of M and [Lambda].
A control chart is a graph that contains a centerline, and upper and lower control limits. The centerline represents the process average.
Variation within the upper and lower control limits is acceptable during operation because it is due to "common causes" which are normal and random.
We use the same numbers for the formula for the lower control limit, except that we subtract.
It can also be pointed out here that by using the exact probability limits, the requirement for lower control limit to be greater than zero is
The data, together with the upper control limit (UCL = 122 degrees C) and the lower control limit (LCL = 118 degrees C) will return a process capability (Cp) value:
To reduce the number of scrap products [s.sub.L] on the left, we are tempted to tighten the lower control limit in order to reduce [ARL.sub.L] (i.e.

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