I'm working in an automotive company that must follow IATF (International Automotive Task Force) requirements.
I administrate a test-bench that performs RF (radio frequency) tests using an appropriate measure instrument.
As IATF requires, the test-bench has been successfully validated using MSA (Measurement System Analysis) procedures for the production process where the test is performed.
After one year without changes both in production process and test-bench measure chain the instrument must be calibrated (and adjusted accordingly if necessary) from the producer (calibration lasts one year).
IATF requires that every change in the process must be verified with the MSA. The problem is that "change" is too much generic, and I can't find the proper IATF documentation.
Have I to re-perform MSA after the calibration/adjustment of the instrument?
- the instrument is the same as before (same serial number) or is the same model (different serial number)
- the instrument is fresh calibrated (like when I performed the MSA first validation)
- the instrument is plugged out, calibrated or replaced with a calibrated one (same model) and than plugged in.
so, my opinion is that the measurement test chain is the same as before so I don't need to provide MSA documentation to auditors. The calibration + optional adjustment process don't modify the instrument, it restores the instrument to the conditions of the previous calibration.
I'm not able to find official IATF documentation or others sources about that: does calibration + optional adjustment procedure modify the measure process?
This is the calibration definition from the MSA AIAG manual:
A calibration system is a set of operations that establish, under specified conditions, the relationship between a measuring device and a traceable standard of known reference value and uncertainty. Calibration may also include steps to detect, correlate, report, or eliminate by adjustment any discrepancy in accuracy of the measuring device being compared.
so, by definition, a calibration process is a check between instrument actual characteristics and nominal characteristics that comprises adjustments to align real and nominal characteristics. In any case after this process real characteristics are compliant to nominal.