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  ISO 9001/4:2000
  Control of monitoring and measuring devices

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Author Topic:   Control of monitoring and measuring devices
posted 06 June 2001 07:19 AM           Edit/Delete Message   Reply w/Quote
The ISO 9001:2001 refers that the organization shall identify the processes needeed for the quality management and determine the sequence and interaction of these processes. The question is: Shall we have to establish a different Calibration Plan (Control of monitoring and measuring devices) for each process or we can maintain one with all?


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From:Lilburn, GA, USA
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posted 06 June 2001 03:36 PM     Click Here to See the Profile for Graeme   Click Here to Email Graeme     Edit/Delete Message   Reply w/Quote
In my opinion, the answer to your question is that one calibration plan is sufficient for all production processes. Except for very special cases, the calibration requirements of a measuring instrument are not dependent on the process it it used in. The person doing the calibration often does not know or care what the process is -- they only know about the tool he or she just picked up to work on. Also, if a common measuring instrument is issued at random from a central toolroom, it is likely to be used on a different process every time.

Calibration verifies the performance of a measuring instrument against its own specification, by comparing it to a known standard of lower uncertainty. In most cases, the process the instrument is used in has no effect on the instrument's own specifications or, therefore, the calibration requirements. There are some exceptions, but they are (in my experience) rare.

Differences between different types of instruments are handled by the calibration activity. Micrometers, theodolites and voltmeters each require different calibration processes, but that is because they are different types of instruments. It has nothing to do with the processes they are used in, though.

Graeme C. Payne
ASQ Certified Quality Engineer

[This message has been edited by Graeme (edited 06 June 2001).]

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