Certificate generation

Saving a calibration best-effort generates an A4 PDF certificate in the same request — if generation fails for some reason, the calibration record is still saved; you can regenerate the certificate later.

Contents

• Header — QR code and certificate number.
• Asset info — the asset and channel calibrated.
• Traceability — the procedure followed, the reference standard used (internal calibrations), and the recorded environmental conditions.
• Results — the fitted coefficients and equation, the regression statistics table (see Curve fitting), the itemized uncertainty budget table (see The uncertainty budget), and the statement of conformity (see Decision rules).
• Dataset — the raw point table and a fit chart.

The uncertainty section prints a full-sentence GUM §7.2.4-style statement — value, coverage factor, basis (normal vs. t-distribution), confidence level, and the valid range the uncertainty applies over — adapted for a calibration function rather than a single measurement result, since that's what Open Gauge certifies.

What's deliberately not on it

Per ISO/IEC 17025 §7.8.4.3, the certificate never prints a calibration-interval recommendation unless explicitly agreed with the customer. Open Gauge doesn't have that agreement flow yet, so no interval or "due date" language appears on the certificate at all — even though Open Gauge computes a recommended interval for its own health scoring internally.

Fetching a certificate

GET /calibrations/{id}/certificate returns a 1-hour presigned MinIO URL, generating the PDF on demand if it's missing. See Calibrations in the API Reference.