A chamber reaching one setpoint during a demonstration is not enough to close every requirement. This guide provides a practical record structure for procurement, test engineering, quality and facilities teams. It is an acceptance-planning aid, not a replacement for an approved test procedure or a product certification program.
Start with a signed requirement-to-evidence matrix
Before scheduling the witness visit, give each purchased requirement a reference number. Link it to the quotation revision, drawing, performance specification or approved change. Then assign the verification method: document review, inspection, measurement or demonstration. Avoid adding an unpriced test at the witness visit and treating it as an original contractual requirement.
Every matrix row should identify the expected result, evidence file, acceptance owner and treatment of deviations. Resolve ambiguous terms such as “fast ramp,” “uniform temperature” or “complete reporting” before execution. The acceptance criterion must say what is measured, where, under what conditions and against which agreed limit.
Separate empty-chamber performance from loaded performance
Define the chamber condition for every performance check. An empty working space, a passive fixture and a powered specimen are different configurations. Record specimen dimensions, mass, placement, dissipation and cable routing when a loaded run is part of the purchased scope. Photograph the setup so that the site team can reproduce it.
IEC 60068-3-7:2020 addresses measurements in loaded temperature chambers for cold and dry-heat tests, including heat-dissipating and non-heat-dissipating specimens and consideration of air circulation. Its scope should not be stretched into a universal FAT procedure for every chamber function. Use the controlled method relevant to the equipment and application.
Check document status during contract review. The IEC catalogue marks IEC 60068-3-5:2018 as withdrawn, with a withdrawal date of December 31, 2024. If an older edition is specified contractually, record that decision and obtain agreement on its use; do not describe it as the current standard. This checklist does not nominate a replacement edition.
Define measurements before starting the test
Record instrument identification, calibration status, measurement locations, sampling interval and the evaluation window. Distinguish chamber control readings from independent verification measurements and from specimen sensors. Specify whether a transition rate refers to chamber air or specimen response, and how the start and end points are calculated.
Set the stabilization rule before collecting results. A dwell that begins when the controller first crosses a setpoint is not necessarily equivalent to a dwell that begins after all required measurement positions meet an agreed condition. Keep the original data and the calculation method together so QA can reproduce the reported result.
Use a focused FAT checklist
| Check | Evidence to retain | Decision to agree beforehand |
|---|---|---|
| Configuration and dimensions | Serial number, option list, drawings and photographs. | Which dimensions, interfaces and accessories are contractual? |
| Temperature and humidity performance | Approved profile, sensor map, raw trends and calculations. | Which points, load condition, limits and evaluation windows apply? |
| Specimen interfaces | Fixture, port and signal-channel demonstration records. | Who supplies adapters, cables and external equipment? |
| Alarms and protective functions | Approved cause-and-effect test record and event log. | Which safe simulation method verifies each function? |
| Controller and data export | Recipe revision, exported files and user-access demonstration. | What data must remain usable after handover? |
| Documentation and service items | Manuals, calibration records, backups and spare-parts list. | Which deliverables are required before shipment? |
Only perform protective-function tests using an approved safe procedure and authorized personnel. Do not defeat interlocks or create a hazardous specimen failure merely to demonstrate an alarm. Where a function cannot be witnessed directly, agree on the alternative evidence and any remaining limitation.
Make SAT specific to the installed site
At the site, first confirm shipping condition, equipment identity, placement, access and utility connections against approved documents. Record the actual utility conditions during the run, not just the building’s nominal service rating. Confirm that maintenance panels and emergency controls remain accessible with the final installation in place.
Then repeat the agreed subset of performance and interface checks. Explain why each FAT result is accepted by document review or repeated at SAT. If the load, utilities or instrumentation differ, document the difference before comparing results. Use Bellue’s installation and commissioning service discussion to settle supplier and local-contractor responsibilities.
For a walk-in or drive-in chamber, include the final loading route and operating workflow in the agreed checks. Do not assume a factory demonstration alone verifies every feature assembled on site.
Keep calibration and acceptance distinct
A calibration certificate provides information about the identified measurement system under stated conditions. The buyer still needs evidence for the other purchased requirements: configuration, loaded performance where specified, software outputs, interfaces and operating documentation. Conversely, a successful demonstration should not replace missing calibration evidence when calibration is required.
Ask QA to review certificate scope and instrument identity, rather than simply checking that a PDF exists. Link each measurement channel used for acceptance to its supporting record. Any adjustment or instrument replacement during testing should be reflected in the affected results and the decision about retesting.
Close deviations with evidence, not an informal promise
Give each deviation an owner, agreed corrective action and target date. Identify whether it prevents shipment, installation, routine operation or only final administrative closeout. The responsible buyer must approve any conditional acceptance; the supplier should not silently convert a failed criterion into an accepted exclusion.
After correction, retain the original result and the retest evidence. State which checks were repeated and why that scope is sufficient. If the correction changes an interface or control function, assess which other acceptance checks depend on it. The final record should make the unresolved items visible.
Copy this acceptance record structure
- Requirement ID and source: [contract / drawing / approved revision].
- Stage and setup: [FAT or SAT, load, utilities, instruments and sensor map].
- Criterion and method: [agreed limit, evaluation period and calculation].
- Observed result: [measured value or documented demonstration].
- Evidence reference: [raw data, photographs, certificate or test record].
- Disposition: [accepted, retest required or approved conditional acceptance].
- Owner and sign-off: [responsible person, date and open-action reference].
Prepare the handover package
Collect the signed matrix, raw data, deviations and retests, as-built drawings, manuals, calibration records, controller backups and training records in one controlled package. Identify who maintains it and how later configuration changes will be recorded. Keep commercial acceptance, safe release for operation and product qualification decisions distinct where different owners are responsible.
For a new environmental chamber project, send Bellue your required acceptance matrix with the test profile, specimen information and site conditions. Agree on witness scope and required deliverables before the order is finalized. Non-standard interfaces can be discussed through the custom solutions RFQ.
Sources and scope
The matrix and handover workflow above are practical procurement recommendations. The IEC references establish their stated publication scopes and status, not a universal contractual FAT/SAT checklist.