Instrument Calibration & Documentation SOP
Insatech's core calibration SOP: verify traceable reference equipment, record as-found readings before adjustment and as-left readings after, then issue a certificate an auditor can follow end to end.
How it works
Replace the lanes with your actual lab roles
This chart uses ServiceDesk, Calibration Lab and QA & Documentation. If your lab splits identification/prep from hands-on calibration, or certificate review sits with a separate quality manager rather than the technician who did the work, give that role its own lane rather than folding it into Calibration Lab.
Put your own accreditation scope on the traceability check
"Verify reference/standard equipment is traceable and in-date" needs a stated basis, DANAK, another national accreditation body, or an in-house method, not just "checked". Write which standard applies, and the reference equipment's own recalibration due date, into the row's comment field so the technician isn't relying on memory.
Decide what closes the loop between the two decisions
"Within tolerance?" and "Re-test within tolerance?" are separate decisions on purpose: the first covers the instrument as it arrived, the second covers it after adjustment. Confirm your team agrees on how many adjustment attempts are allowed before a job routes to "Hand off to Out-of-Tolerance Calibration SOP" rather than looping indefinitely.
Set People and Workload on every row before you rely on the BI panel
The workload panel can only total hours for rows that carry them. Fill in People and Workload for each step as you adapt the chart, using realistic effort hours rather than elapsed time, so a busy calibration week actually shows up as a busy week for the right person.
Confirm the certificate template pulls from both calibration rows
"Issue calibration certificate and documentation" only works as a defensible record if it draws on both "As-found calibration" and "As-left calibration", plus the reference equipment's own traceable data. If your certificate template only has room for one reading, that's a documentation gap this SOP is designed to surface.
Frequently asked questions
What's the difference between as-found and as-left calibration, and why record both?
"As-found calibration: record readings before any adjustment" captures what the instrument was actually doing when it was checked, evidence of drift since the last calibration. "As-left calibration: record final readings" captures what it's doing when the job closes. Both are recorded on every job, even when the as-found reading already passed and no adjustment was made, because a certificate with only one value can't show whether the instrument was checked and found good or simply never adjusted.
What happens if the instrument is still out of tolerance after adjustment?
The "Re-test within tolerance?" decision routes that case to "Hand off to Out-of-Tolerance Calibration SOP" rather than looping adjustment attempts indefinitely or forcing an as-left entry that isn't real. That SOP owns the deviation assessment, the customer notification and the repair-or-replace decision; this chart only marks where the handoff happens.
Why does traceability of the reference equipment come before the instrument is even calibrated?
"Verify reference/standard equipment is traceable and in-date" clears before "As-found calibration" because every reading taken afterward is only as good as what it was measured against. A reference standard with an expired certificate or no traceable chain to a national standard invalidates the readings regardless of how carefully the instrument itself was handled, so the chart makes the check unavoidable rather than optional.
Does this SOP cover what happens after a customer disputes a certificate?
No. This chart ends at "Instrument released, certificate issued" and assumes the certificate is accepted. A dispute, or a failure discovered later that traces back to a bad calibration, is handled as a separate case; this SOP is the record you'd hand over as the starting point for that investigation, not the investigation itself.
Can this SOP be used for a site visit as well as a lab job?
Yes, the sequence, reference verification, as-found, tolerance decision, adjustment if needed, as-left, certificate and release, applies the same way whether the instrument comes to the lab or the technician goes to it. "Work order received" already distinguishes the two, and only the location on "Identify instrument" changes.