The quality assurance system is based on statistical quality control methods. All products are tested in accordance with IEC 410/IEC 414 sampling plan to ensure an acceptable Average Quality Level (AQL) for major and minor defects. A brief review of defect categories & AQL is presented below:
Classification of Defects:
Major Defects:
These defects lead to a malfunction of the finished wound components. Cosmo lot acceptance criteria permits 0.4 AQL for major defects.
Minor Defects:
These defects do not have a severe effect on the function of wound component. Often they have a negative effect on the visual appearance of the end product.
Cosmo lot acceptance criteria permit 0.4 AQL for minor defects.
| EE, EC, EER, ETD CORES | Major Defects | Minor Defects |
|---|---|---|
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| EI CORES | Major Defects | Minor Defects |
|---|---|---|
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| UU CORES | Major Defects | Minor Defects |
|---|---|---|
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| TOROIDS | Major Defects | Minor Defects |
|---|---|---|
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AQL and Inspection Levels for Major & Minor Defects
| Defect | AQL | Inspection Level | Sampling Plan |
|---|---|---|---|
| Major | 0.4 | ILV | IEC-414 |
| Minor | 0.4 | S3 | IEC-410 |
Traceability
A 7 digit batch number written on each label stuck on each box that helps to retrieve below information :
- Material grade used
- Type of core
- Granulate/Powder batch used
- Quantity and date of pressing
- References of machines involved in the process of relevant lot
Outgoing Inspection
Each lot passes through a final outgoing inspection before entering into the Finished Goods. During this inspection, all results (Dimensions, AL, Power Loss, Peak Induction, Mechanical Strength etc.) are checked, some samples are controlled and the test report is supplied to the user along with each lot.