Direct answer
Match a calibration certificate to the actual instrument and measurement scope, then review results, uncertainty and adjustment history. A functional-test report is not automatically a calibration certificate; acceptable as-left data alone cannot validate earlier measurements. Traceability concerns a measurement result and still requires an appropriate measurement process.
Identify the service behind the document
EXFO's service guidance distinguishes calibration, calibration with as-found results and functional testing. It describes calibration certificates with measurement standards, results, uncertainties and as-left data, while functional testing generally supplies a test report.
Check the service and contents rather than accepting a document title alone. This review applies to optical power meters, loss testers and related measurement records. It establishes no universal calibration interval.
| Record | Review | Avoid assuming |
|---|---|---|
| Functional test | Functions and criteria tested | Full metrological calibration |
| Calibration results | Quantities and conditions covered | Every instrument function |
| As-found data | State on arrival for service | Included in every service |
| As-left data | State after service/adjustment | All earlier results valid |
| Field report | Actual method/configuration | Sticker replaces review |
Match the actual measuring unit
Associate model, serial number, replaceable measurement module and test date with the certificate. For modular platforms, a chassis number alone may not identify the measuring unit. Ask the test party to explain the module-to-certificate relationship.
Retain service date, document revision and scope. Set intervals using applicable equipment guidance, quality requirements and usage, not another model's recommendation.
Request missing pages or scope information before accepting unexplained pass statements. Preserve identifiers that allow a later investigation to locate affected reports and batches.
Separate wavelength range from calibration coverage
EXFO's FOT-600 specification lists wavelength range separately from calibrated wavelengths and qualifies uncertainty by conditions. The fields should therefore be reviewed individually; operating within a stated range does not remove the scope review.
Put wavelength, power range, connection and measurement mode in the project plan, then compare certificate and formal specifications. No model-specific value becomes a universal power-meter limit here. Display resolution is not a substitute for uncertainty.
As-found and as-left answer different questions
As-found results concern the received state; as-left results concern the state after service or adjustment. Where earlier work may be affected, give the responsible party usage history, checks and the relevant measurement period.
Specify whether as-found records are needed when ordering service, including notification and data retention for abnormal findings. Decide historical-report review from actual deviation, scope and project decision requirements, not a recalibrated label alone.
| Evidence | Include | Purpose |
|---|---|---|
| Instrument schedule | Model, serial, module | Identify measuring unit |
| Scope comparison | Wavelength, range, mode, conditions | Match project |
| Calibration results | Values, uncertainty, references | Review completeness |
| Service history | As-found/as-left and replacements | Separate past/current states |
| Impact assessment | Period, results and action | Define follow-up |
Assess traceability and suitability separately
NIST's traceability FAQ defines traceability as a property of measurement results supported by a documented calibration chain and uncertainty. Traceability does not automatically establish fitness for a particular purpose.
Treat the certificate as one part of the evidence. Continue reviewing reference method, connection, environment and uncertainty against the project. These are procurement recommendations; no ARRANEX calibration accreditation or instrument-calibration service is asserted.
Procurement FAQ
- Is a functional-test report a calibration certificate? Review the service and actual contents.
- Does a current certificate cover all wavelengths? Check calibration scope and operating conditions.
- Do acceptable as-left results validate old reports? Historical-state and impact review may be needed.
- Must every interval be one year? Use equipment and quality requirements; no universal interval is set here.
- What should be requested first? Instrument schedule, complete certificate, scope and service records.
Related products and reading
- Test connection requirements
- Test reference cords
- Uncertainty and acceptance decisions
- Loss-test reference validity
Related pages support configuration and verification review. Manufacturability, materials, performance and delivery scope depend on mutually confirmed specifications.
Contact an engineer with interface drawings and validation requirements
Sources and review date
Reviewed on 2026-10-21. Source publication/update dates remain separate. Manufacturer examples explain technical points; procurement tables are editorial recommendations, not ARRANEX specifications, certifications or supply claims.
Sources checked: 2026-10-21