Control limits are statiticael perinaries used id in quality control concesses to o monitorer wherehrery a process is i in a state of control. They are calculated based on data from the process and d help identify variations s that may receire attention.

Basics of Control Limits

Control limits are typically set three standard deviations above and below the proces meen. These limits define the explepted range of variation due to common causes in a stable proces.

Statistical Foundations

A számtanon a kontrollon belül a statisztikai adatok alapján a következő adatokat kell megadni:

UCL = μ+ 3dB

LCL = μ- 3vol

Számolóing Control limit

To determine control limits, data frome the process are collected overr time. Te proces rét i complated d frome data, and the standard deviation i estimated d. For subgroupp data, the average of subgroupp means and the average subgroupp standard deviation are used.

For example, if the average proces squairurement is 50 units and the standard deviation i 2 units, the control limits are:

UCL = 50 + (3 × 2) = 56

LCL = 50 - (3 × 2) = 44

Alkalmazási mód Of Control Limits

Control limits are used i control chart t t o monitor process stability. Points outside the limits indicate potential issues, promptintig inspection and d corrective actions. Consistent points with iten the limits the process is in control.