PPM or DPMO Your Soldering Yields

By January 22, 2016No Comments

There are no easy methods for companies to compare their manufacturing yields with other similar businesses. A common question asked by many companies is how does my process compare with other companies in terms of yield? The information does not exist or is not easily available to small and medium volume companies.

The lack of process yield data for company comparison is a problem which exists for small, medium and large volume companies and should openly be available to the industry. Many industry and research projects, which receive funding from Europe and UK Government, quote industry issues with little data. Having data on the industry’s manufacturing issues does allow future proposals to be targeted correctly.

Bob Willis set up amd ran the SMART Group PPM Project for two years and also helped set up the European finded LEADOUT project with the most commonly used method of illustrating yields, Part Per Million (PPM) Defective or Defects Per Million Oppertunities (DPMO). This provides a measure of the defect level against a process stage or a specific product compared against a known number of opportunities for defects to occur. There are IPC and IEC documents and procedures which do exist to monitor a process, which would be considered during the development phase of this project.

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