This document describes the implementation and operation of Part Average Testing (PAT) on the Cassini ATE platform.
WHAT IS PAT
PAT is an acronym for “Part Average Testing.” The goal of PAT as described by the AEC (Automotive Electronics Council)
is to identify individual parts within a lot that are behaving differently from all the other parts within that lot. These parts,
referred to as Outliers, represent some portion of the lot that has an underlying flaw or deficiency usually manifesting in
shorter life expectancy even though they pass static program test limits. The idea is that traditional test limits cannot not
accurately screen and/or characterize this failure type from the mean population.
PAT uses statistics to determine the mean and standard deviation of each test result and then uses those statistics to set
limits on how far a test result may deviate from the general population before the part is considered an outlier. Generally
accepted methods of determining the statistics are implemented with Static PAT (SPAT) and Dynamic PAT (DPAT).
Cassini Short Cut with Patch 247 PAT support in Method Calc Nodes
(note: customer specific modifications may be included in other patches)