Setting Up DPMO

You can use this process to set up defects per million opportunities (DPMO).

Process

You create an NC data type in Data Field Assignment Maintenance that includes the Root Cause Operation field set to either Optional or Required (see Data Field Assignment Maintenance).
Operators must enter the root cause operation when they use DPMO-related NC codes. The root cause operation is the upstream failure operation in the repair loop, and indicates the root cause of the problem.
If required, in NC Code Maintenance (see NC Code Maintenance), you create additional NC codes to use with DPMO:
- You assign DPMO categories to NC codes. You can assign a DPMO category only to an NC code of category Defect.
- You specify the NC data type created in the previous step. For the DPMO codes that come with the system, the NC data type is PCA.
On the DPMO tab page of Material Maintenance (see Material Maintenance), you identify the following:
- The category the system uses to calculate DPMO for the material
- The operation at which operators can log a defect NC code with a DPMO category
- The number of opportunities on this material that has the possibility of being defective
  For example, a particular PC board may have 200 areas in its circuitry where it could fail.

Result

When an operator logs an NC against an SFC number representing a material with information on the DPMO tab page, the system performs the calculation specified by the DPMO category and writes the results in the DPMO Report.

Example

An analysis operator logs the PARTMISALIGNED NC code to SFC number ABC123 that represents PCBOARD, version A. The PARTMISALIGNED NC code is assigned to the PLACEMENT DPMO category. Therefore, the system calculates the number of placement defects divided by the number of placement opportunities entered in Material Maintenance for PCBOARD, version A multiplied by 1,000,000. The system writes the results in the DPMO Report along with the Root Cause operation entered by the analysis operator.