upper control limit


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upper control limit

[¦əp·ər kən′trōl ‚lim·ət]
(industrial engineering)
A horizontal line on a control chart at a specified distance above the central line; if all the plotted points fall between the upper and lower control lines, the process is said to be in control.
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This was tried both ways, and the upper control limit tended to be quite wide when the limits were based on the [chi square] limits.
The points are erratic; two points are significantly above the upper control limits, and a few points are on or below the lower control limits.
2) Calculate the upper control limit, UCL and the lower control limit, LCL of the arithmetic average surface roughness [R.
The probability limits are 4 and 134 respectively, [TABULAR DATA FOR TABLE III OMITTED] while the 3-sigma upper control limit is 109.
As expected, there is a great difference between the upper control limits obtained.
It is easy to see that sample 10 in the first production run is above the upper control limit.
Table III compares the probabilities below the lower control limit LCL = -3 and above the upper control limit UCL = 3 associated with [z.
This chart also includes three horizontal lines: the average, the upper control limit (UCL) and the lower control limit (LCL).
VMIN] holds the value of the upper control limit [UCL.
It is possible to note that the data followed the quality criteria in regards to its distribution, as the data obtained are within the lower and upper control limits, guaranteeing the absence of discrepant data that may jeopardize the quality of the experiment.
1] is within the lower and upper control limits, showing stable behavior and the lowest variability of data, in which most are found around the mean (Figure 1).

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