A Core Supplier Cannot Be Qualified by One Exceptional Parameter
A superb burr result cannot compensate for a …
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Testing, standards & specification
Practical engineering articles for transformer-core selection, design and production.
65 articles
How to Recognize a Core Test Report That Cannot Support a Decision
A precise watt figure can be the least useful…
Read full articleWhy an Excellent First Sample Can Be a Poor Production Predictor
The first sample may have passed through a pr…
Read full articleRepeatability: What the Best Test Result Cannot Tell You
Ask for the sequence, not the record result. …
Read full articleDimensional Acceptance and Magnetic Acceptance Are Different Tests
A complete set of green dimensional checks ca…
Read full articleStack Thickness Is a State-Dependent Dimension
A stack can be too thick for the winding and …
Read full articleWhen Actual Core Weight Does Not Match the Drawing
The scale is reporting a discrepancy. It is n…
Read full articleLocal Defects Require Local Inspection Logic
A defect can occupy too little material to mo…
Read full articleWhy Calculated Core Loss and Measured Loss Do Not Match Exactly
Before adjusting the building factor, check w…
Read full articleEU Ecodesign: Start the Core RFQ with the Transformer Requirement
"Ecodesign compliant" on a core quotation lea…
Read full articleDOE Efficiency Requirements: Translating the Rule into a Core Loss Budget
"DOE compliant steel" is not a complete procu…
Read full articleWhen Two Loss Results Are Not Comparable
Supplier A reports fewer watts than Supplier …
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Short reference notes complement the full published articles.