In brief

Agree the labelled sample set, operating conditions, repetitions and acceptable results before the challenge trial. Compare each expected decision with the observed result, recording bad samples accepted and good samples rejected separately, alongside marginal or unresolved cases.

For in-line inspection using visible weld-feature inspection, describe the realistic range and how changes in false-accept, false-reject and challenge criteria affect the result you need.

On the production floor

Turn your production information into clearer decisions — Visible Weld Feature Inspection

Plan visible weld feature inspection around representative good, bad and marginal samples, line presentation, lighting, reject handling and challenge criteria. Discuss an optical feasibility trial with Oxford Vision Systems. Use this guide to resolve false-accept, false-reject and challenge criteria before it limits the final system.

Discuss your application
What to record

False-Accept, False-Reject and Challenge Criteria: condition, range and effect on your process

Current condition

Record the current inspection method and who agrees each sample label. For every trial condition, retain the expected and observed decision, the repetition count and the agreed acceptance limit; this makes the basis of a pass or failure reviewable.

Realistic range

Challenge the agreed normal, difficult and marginal samples across the relevant part variants, presentation and production speeds. Include the planned fault and recovery checks, and record any condition that could not be demonstrated.

Effect on the system

Review exceptions and unresolved results before agreeing the final scope. Connect the findings to the recipe, reject and line-control responsibilities, and record corrective actions or further trials rather than treating an overall result as proof of every condition.

Before you contact us

Five questions about false-accept, false-reject and challenge criteria for your application

  1. Who can confirm this information?Identify the person responsible for false-accept, false-reject and challenge criteria in production, quality, engineering or operations.
  2. How representative is the sample?Include age, supplier, batch, environment and upstream process state where they affect visible weld feature inspection.
  3. What is the difficult condition?Include the slow, reflective, flexible, dirty, damaged, marginal or uncommon case that your system must still handle.
  4. How will you judge the result?Agree the method, repetitions, acceptable range, result record and the response if the observed result falls outside the agreed range.
  5. What else must be coordinated?Your final visible weld feature inspection scope must also account for recipe, reject and line-control interfaces, false-accept, false-reject and challenge criteria, current regulations and the conditions at your site.
Connected details

Review false-accept, false-reject and challenge criteria as part of the complete system

Question 1

Visible Defect or Measurement Definition for Visible Weld-Feature Inspection

For Visible Weld Feature Inspection Challenge-test checklist, describe the current position, required outcome, acceptable limits and known exceptions for visible defect or measurement definition for visible weld-feature inspection. That lets us compare options against your real production rather than one nominal value.

Question 2

Good, Bad and Marginal Sample Range

For Visible Weld Feature Inspection Challenge-test checklist, describe the current position, required outcome, acceptable limits and known exceptions for good, bad and marginal sample range. That lets us compare options against your real production rather than one nominal value.

Question 3

Part Presentation and Production Speed

For Visible Weld Feature Inspection Challenge-test checklist, describe the current position, required outcome, acceptable limits and known exceptions for part presentation and production speed. That lets us compare options against your real production rather than one nominal value.

Question 4

Optics, Lighting and Environmental Conditions

For Visible Weld Feature Inspection Challenge-test checklist, describe the current position, required outcome, acceptable limits and known exceptions for optics, lighting and environmental conditions. That lets us compare options against your real production rather than one nominal value.

Question 5

Recipe, Reject and Line-Control Interfaces

For Visible Weld Feature Inspection Challenge-test checklist, describe the current position, required outcome, acceptable limits and known exceptions for recipe, reject and line-control interfaces. That lets us compare options against your real production rather than one nominal value.

Question 6

False-Accept, False-Reject and Challenge Criteria

For Visible Weld Feature Inspection Challenge-test checklist, describe the current position, required outcome, acceptable limits and known exceptions for false-accept, false-reject and challenge criteria. That lets us compare options against your real production rather than one nominal value.