Match a DCC to the Right Gauge: Read the Item Identifiers
Four identical plug gauges, four DCCs back from the lab. Match on issuer-qualified item identifiers, not the gauge name, before you link the evidence.
Category: Digital Calibration Certificates
DCC Ingestion: When Structured Certificates Stay Stranded
Your supplier sends DCC XML, but your team still re-keys results. See how to test the gap between a stored certificate and a usable calibration record.
When the Lab Reissues a DCC: Supersede, Don’t Overwrite
A revised DCC lands weeks after you ingested the original. Overwrite it and you lose your audit evidence. How to supersede it under ISO/IEC 17025 7.8.8.
XSD-Valid Isn’t Accepted: 3 DCC Validation Gates
Your DCC passed XSD validation. It can still be unsigned, altered or for the wrong instrument. Three ingest gates that make a DCC safe to trust.
Store DCC uncertainty as data, not a spreadsheet string
"± 0.3" is not the uncertainty. See what a PTB DCC really carries — k, coverage probability, distribution — and why to store it, not re-key it.
Issue a Signed DCC When Your OEM Rejects the PDF
Your OEM stopped accepting PDF calibration certificates. How to issue a signed, machine-readable DCC downstream — without overstepping traceability.
Signed DCC vs Spreadsheet: Tamper-Evidence at Audit
A re-keyed spreadsheet cell proves nothing at audit. A signed Digital Calibration Certificate is evidence your assessor accepts — and how to ingest one.
Inside a DCC: Anatomy of the PTB v3.3.0 Schema
A block-by-block tour of the PTB DCC XML schema v3.3.0: administrative data, measurement results, D-SI units, and the signature that makes it trustworthy.