Glossary · definition
As-found / as-left
As-found data are the instrument's readings before any adjustment; as-left data are the readings after adjustment. Both are needed to judge whether measurements made since the previous calibration were affected.
See also:Calibration
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Articles on As-found / as-left
As-found vs as-left
Why both sets of readings matter, and what to do when the as-found data are out of tolerance.
How to set calibration intervals
There is no universal interval. Set it from risk, manufacturer data and — above all — the instrument's own as-found history.
Calibration, adjustment and verification are different things
Calibration measures; adjustment changes the instrument; verification compares against a requirement. Mixing them up leads to lost as-found data and unsupported claims.
Questions to ask before sending equipment for calibration
Points, tolerance, decision rule, as-found reporting, adjustment policy, turnaround and packaging — settle them in the purchase order and the certificate will be usable.