![]() The PWI also assists you to find the single best profile that your process is capable of attaining. It tells you the exact range of your process window, and thus how robust your profile is. As a percentage of maximum deviation, this works out to be 12/20= 0.6 or 60%. For example, if the process ‘mean’ is set at 200 ☌ with the process window standardized at 180 ☌ and 220 ☌ respectively, then a measured value of 188 ☌ implies a process window index of −60%.Įxplanation of the mean being 200 ☌: Maximum deviation is 200-180=20 or 200-220=-20. Raw temperature values are normalized in terms of a percentage comparative to both the process mean as well as the window parameters. Any process window index (PWI) which is greater than or equal to 100% is as obvious out of the window. The center of the process window is usually declared as zero, and the extreme edges as ☙9%. A thermal profile is classified on the basis of how it fits in a process window. Process window is the essential temperature range.
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