00041 �5182e98865725a7daf6c31d7124360

40

Molnau

PROGRAM CONTROL DIAGRAM

PROCEDURĘ    OPAL

Data

Input

C

I

a

s

s

I

f

I

e

d

tnttiallz*

Rtad

Evaluata

Confirm

Adjust

Figurę 6. System Flowchart

After the finał stage, the system is prepared to receive another system for classification. When no morę signals are available or when desired, summary reports of the various performance measures can be printed.

Test Scenarios

The process scenarios were chosen to represent three simple, yet common, changes possible. The in-control case, or nuli case, represents a process that has not changed and needs no interruption. The sudden shift case represents a process that has undergone some change, possibly an eąuipment failure or misalignment. Finally, the process drift case represents a process with a problem which is gradually worsening. This may be caused by tool or eąuipment wear.

Each case was based at a process defect level of 50 PPM. In the cases where the process changes, a doubling of the process to 100 PPM was conducted. At least one thousand simulated defects were produced to test each scenario for the system and the baseline. Figurę 7 depicts the mean defect