How to Write an Environmental Test Plan That Survives an Audit
The test plan written two years ago by an engineer who left. The conditions changed. Nobody updated the document. Then the customer asked to review it.
Read article →How Many Samples Do You Actually Need for Environmental Testing?
The standard says three. The customer wants statistical confidence. The timeline has room for two. Here's how to resolve that with data, not negotiation.
→How to Handle Test Deviations and Chamber Excursions Without Invalidating Your Results
The chamber overshot by 4°C for 22 minutes on day 11 of a 28-day study. The question isn't whether it happened — it's whether the results still hold.
→When Lab Tests Pass and Products Still Fail in the Field
The product passed 1,000 temperature cycles. It failed in service after 18 months. The test was run correctly. The test was wrong.
→All articles
How to Set HALT Operating Limits: FOL, DOL, and What to Do With the Data
HALT produces two numbers that change every design decision downstream. Most teams write them down and move on. Here is what to do with them instead.
What Environmental Test Records Must Contain — And What Auditors Actually Check
The test ran three years ago. The engineer who ran it left. A customer needs re-qualification — and the records are in a folder named 'final FINAL v3'.