control limits


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control limits

[kən′trōl ‚lim·əts]
(electronics)
In radar evaluation, upper and lower control limits are established at those performance figures within which it is expected that 95% of quality-control samples will fall when the radar is performing normally.
(industrial engineering)
In statistical quality control, the limits of acceptability placed on control charts; parts outside the limits are defective.
References in periodicals archive ?
In order to develop this new methodology, the following issues will be discussed in the paper: (1) Determining the underlying probability distribution of a feature using the goodness-of-fit test, based on which the basic control charts are designed; (2) Determining control limits, which balances the type I and type II errors; (3) Optimal feature subset selection by minimizing a weighted summation of the type I and type II errors associated with the features considered; two selection strategies are proposed; (4) Adaptive modeling of the feature distribution using Bayesian inferences; (5) Online process monitoring with adaptive control limits and sensitizing rules.
This can cause a vicious cycle of restrictive control limits (Figure 1).
In the case of a green sand system, engineers are not necessarily looking for outliers (individual test results falling outside the control limits), but rather looking at the overall chart line to see if the system is trending upward or downward toward one of the control limits (Fig.
His graphs show continuous temperature plots generally tracking within the control limits and excursions (out of "control") which may indicate events--a change of energy (sunspot activity etc.
By repeating tests of the SRM bullets and cartridge cases at local and state IBIS sites, and correlating the images with the Golden Images established at the ATF, control charts and control limits were developed for quality assurance of ballistics acquisitions and correlations in NIBIN.
x] , E(s) and Std(s) can be found and, therefore, the control limits on [bar.
Three-sigma control charts incorporate control limits computed based on plus or minus three standard errors from the targeted mean or proportion.
When data are monitored without an attempt to change anything, and data fall outside the control limits, the process is unstable and something is wrong with the process.
z] are out of the control limits of UCL and LCL until the values of [R.
Intelligent control limits the vehicle's speed depending on lift height to protect the driver and optimize movement within the aisle.
A charge mean outside the control limits indicates that the process is out of control and mill personnel should determine a cause.
The 1995 law, however, removed all federal speed control limits and left them to the states.