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Calibration of Power Supplies

#1
Hi All,

The company I am working for recently went through the AS9100 D audit. We got a minor non-conformance because the power supplies we use for testing are not calibrated. We do use a calibrated DMM to verify the voltage input is within the specified tolerance.

Some of my fellow coworkers believe that it should not be calibrated because we use the calibrated DMM as verification while others believe we should. Should the power supplies be calibrated in addition to using a calibrated DMM as verification?

Thank you in advance!
Tony
 
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outdoorsNW

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#2
We do not calibrate our power supplier and use a calibrated meter to check before use because we have found power supplies don't hold calibration over a year. We are AS9100 and have no problems with either our external auditor or aerospace customers.

Assuming people are actually checking before use, I think the AS9100 auditor went too far. Please post the exact wording of the finding in case the auditor poorly wrote the finding and is actually using the problem as evidence of some other violation.
 
#3
OutdoorsNW, Thank you for the response!

We have come to an agreement. We will not be calibrating the power supplies, the wording has been clarified by the auditor. Thank you again for the response.
 
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