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.
Tag: as-found as-left
Don’t Stamp Today’s Date on Calibration History
Migrating off an Access calibration database? If the import stamps the cutover date on every record, your traceability collapses. Preserve it instead.
An Adjusted Gauge Owes You a New MSA Study
An as-found fail, as-left pass gauge is a modified gauge. PPAP element 8 wants a fresh MSA before it re-qualifies parts. Here's why, and how to prove it.
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.
Who Changed That Due Date? Calibration Data Integrity
A spreadsheet can't prove who moved a calibration due date, or when, or why. How record data integrity holds up under ISO 9001 and 17025 scrutiny.
Editable Access Records: Your Calibration Audit Liability
Your Access calibration DB lets anyone edit a past result with no trace. Here's why that's an audit finding waiting to happen — and how to migrate safely.
As-Found / As-Left: The Field Your Access DB Skipped
Your Access calibration DB logs pass/fail but not as-found/as-left. Here's why auditors ask for it, and how to migrate without losing history.
Out-of-Tolerance: The Reverse-Traceability Playbook
A gauge came back as-found out of tolerance. Here is how to scope every measurement it touched since its last good calibration — and survive the audit.
The False-Overdue Trap in Calibration Recall
The certificate came back but the due date didn't. How false-overdue flags erode trust in your recall list — and how to close the gap before an audit.