Isolation Percentages Using Testing Only- Cum % Column
Description
This column is listed under the Isolation Percentages Using Testing Only label in the Fault Group Size Percentages section of the Fault Isolation Report. Each entry in this column contains the cumulative percentage of the Total Fault Groups that contain no more than the number of replaceable items indicated in the corresponding row in the Size column. The specific numbers that appear in this column are dependent upon the selected Fault Group Counting Method.
Calculation
This Test limit can be calculated by adding up the Test limits in the corresponding % column for all rows up to and including the current row (fault group size), as shown in the following equation:
where
x
=
the specified number of replacement items (Size column)
IsoPctg(i)
=
the percentage of isolated fault groups containing x replacement items (% column)
