Turning a Testing Challenge into a Stronger, More Reliable Process
A customer required magnetic testing of curved ferrite segment magnet samples to validate compliance with
defined specifications. Results were to be benchmarked against international laboratory data, making measurement
accuracy and repeatability critical. Standard magnetic testing protocols require strict surface flatness and minimum
thickness control to ensure uniform magnetic field distribution — but the supplied samples were curved in
geometry.
Root Cause Analysis
Curved samples sent for external flattening
Components were cut and flattened through an external process to meet flatness requirements for testing.
Minor residual curvature remained
Although visually acceptable, subtle geometric deviation persisted after processing.
Flux distribution affected during testing
Residual curvature disrupted magnetic path continuity, leading to measurable variation from expected values.
Discrepancies against international benchmarks
Even slight surface irregularities influenced parameter extraction, revealing how sensitive magnetic testing is to preparation quality.
Corrective actions taken
Re-cutting with verified method
Samples re-cut using a validated flattening process to eliminate residual curvature.
Planarity revalidation
Both thickness and surface planarity were measured and confirmed before retesting.
Specification alignment confirmed
Retesting confirmed full alignment with specification limits and international comparison data.
Identical excitation retesting
Magnetic testing was repeated under the same excitation conditions to ensure consistency
Process improvements implemented
- Formalized sample preparation protocols
- Pre-test surface inspection checks added
- Strengthened vendor coordination standards
- Enhanced measurement reliability framework
"Precision in magnetic testing depends as much on preparation discipline as on instrumentation capability. Every technical challenge offers an opportunity for improvement."
By addressing the deviation transparently and refining internal controls, process robustness was enhanced and
confidence in measurement reliability was strengthened. This engagement reinforced that corrective action, when
handled systematically, transforms an isolated deviation into a stronger, more resilient magnetic testing system.