Identify Externally Performed Tests in a PCB Laboratory Report

A single laboratory report may combine work performed at several organizations. That can be efficient for a PCB qualification or failure investigation, but the report needs to preserve who produced each result. One cover page should not obscure different methods, locations, or accreditation scopes.

Agree the external work before testing

List which operations the contracted laboratory will perform and which it proposes to send elsewhere. Include specimen preparation, conditioning, environmental exposure, imaging, and measurements where relevant. Clarify responsibility for transport, technical instructions, exceptions, and preserving sample identity across the handoff.

NIST’s NVLAP handbook contains specific provisions for identifying externally provided test and calibration data. Use the applicable accreditation rules for the organizations involved; the broader review principle is to keep each result connected to its actual producer and status.

Build a result-provenance table

Review the method-specific scope for each relevant activity. The contracted laboratory’s scope does not automatically describe another laboratory’s work. Request underlying reports or an agreed evidence package when the final decision requires details absent from the consolidated summary.

Preserve preparation history across laboratories

For example, one laboratory may expose assemblies to an environmental condition and another may section selected joints. The second report must identify the exposed specimens and their handling, not merely a generic board model. Use the specimen-remnant map when destructive preparation creates new child samples.

If a subcontractor changes mid-project, review whether method, equipment, reporting, or specimen preparation changes as well. Do not combine the resulting measurements into one trend without evaluating comparability. Keep any method departures and missing observations visible.

Close the work package by reconciling requested operations with received results and final sample disposition. Record the responsible technical contact for unresolved questions about each external result. The consolidated report should make responsibility easier to follow, not harder. A clear provenance trail allows later questions to reach the organization that actually generated the evidence without repeating an entire investigation.