Quality
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.
Major and Minor Defects:
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EE, EC, EER, ETD CORES
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Major defects |
Minor defects |
AL value
Primary dimensions
( Amin, Cmin, Bmin, Dmin, Emax, Fmax)
Bending
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Core loss (Pc)
Peak Induction (B^ )
Secondary dimensions
( Amax, Cmax, Dmax, Bmax, Emin, Fmin)
Visual defects (Chips, Cracks etc.)
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EI CORES
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Major defects |
Minor defects |
AL value
Primary dimensions
( Amin, Cmin, Bmin, Dmin, Emax, Fmax, Gmin)
Bending
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Core loss (Pc)
Peak Induction (B^ )
Secondary dimensions
( Amax, Cmax, Dmax, Bmax, Emin, Fmin, Gmax)
Visual defects(Chips,Cracksetc.)
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UU CORES
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Major defects |
Minor defects |
AL value
Primary dimensions
( Amin, Cmin, Bmin, Dmin, Emax, Fmax, Gmin)
Bending
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Core loss (Pc)
Peak Induction (B^ )
Secondary dimensions
( Amax, Cmax, Dmax, Bmax, Emin, Fmin, Gmax)
Visual defects(Chips,Cracksetc.)
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TOROIDS
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Major defects |
Minor defects |
AL value
Dimensions ( Amin, Bmin,Cmax)
Dielectric strenght (for coated toroids)
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Dimensions
( Amin, Bmax, Cmin)
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AQL AND INSPECTION LEVELS FOR MAJOR & MINOR DEFECTS
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Defect
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AQL
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Inspection Level
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Sampling Plan
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Major |
0.4
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ILV
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IEC-414
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Minor |
0.4
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S3
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IEC-410
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Traceability
A 7 digit batch number written on each label stuck on each Box and allows to get information about: - 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 InspectionEach
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.
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