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Test Implementation and Data Analysis for Statistical Quality Control

This text discusses the implementation of tests, such as dimensional and electrical tests, and the use of DB/DAQ to obtain batch and SSD information. It also suggests improvements for operators, such as better storage and non-conformance analysis. Furthermore, it delves into the analysis of non-conformances and provides answers to common questions.

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Test Implementation and Data Analysis for Statistical Quality Control

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  1. Statistics • 433 tests (dimensional and/or electrical) • 334 geometrical – 258 electrical • almost doubled rate of geometrical tests (still margin • with chuck) • DB/DAQ – to implement: • …. still working on direct connection with Labview set-up • obtain list of batches from DB • get list of SSD in selected batch from DB • (we had 3 cases of batchID-SSDID mismatch) • pop-up message with last SSD tested • recover possibility of saving image from dimensional test • set-up

  2. Suggestions for operators: • write E/G on envelope after test • better storage (e.g. label boxes with batch ID content) • non-conformances analysis Corner names mistake D A B C the change will be transparent to the user – you just will be prompted on corner D instead of A

  3. List of all non-conformances up to 31/01/02

  4. …. let’s analyze more in depth to learn how to behave 34 warning/failed test over 407 SSD tested (dimensional/electrical or both) 8.35% non-conformance rate -> a bit conservative?! specifically: dimensional: 14/308 ~ 4.5% electrical IV: 19/246 ~ 7.7% electrical CV: 1/246 ~ 0 common questions and answers: • Should same warning be duplicated for IV and CV tests? • (e.g. DH00718 marked as scratched for both tests) -> NO • clarify meaning of irregular IV • clarify meaning of broken edge

  5. IV irregularities picture gallery quite high (3/4 times average) leakage current DH00627 DH00838 do not report

  6. IV irregularities picture gallery moderately high (2 times average) leakage current DH00858 DH00791 do not report

  7. IV irregularities picture gallery Strange/unexpected shape DH00764 DH00826 • redo measurement • report as warning

  8. IV irregularities picture gallery again a strange shape but indeed dangerous (breakdown?) DH00828 nevertheless within specs, so do report a warning

  9. IV irregularities picture gallery What’s wrong here? DH00798 do not report this reduces non-conformances to 30

  10. Scratches DH00809 • report as warning • check if current increased and is still within specs

  11. Scratches scratches on pad produced during testing should be a random and learning-phase problem DH00567

  12. Scratches DH00593 • check current • do not report if you see no effect

  13. Labelled as scratches DH00668 DH00674 learning-phase problem • report only if bigger • I will add a ‘minor break’ warning option in the menu

  14. Deviations from standard pattern DH00732 ‘ weird bias ring at corner A’ learning-phase problem do not report unless very seriuos (e.g. interrupted or shortened strips - should affect current and coupling – specify) this reduces non-conformances to 25

  15. Problems with IDs 2 ID mismatch -> ID changed on envelope – report? • 7 missing or faint scratch-ID -> • report as warning • contact HPK Should be a problem related to this particular batch

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