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  Measurement, Test and Calibration
  CALIBRATION FREQUENCY

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Author Topic:   CALIBRATION FREQUENCY
VALENTINEO
Lurker (<10 Posts)

Posts: 4
From:Warri, Delta state, Nigeria
Registered: Aug 2000

posted 21 August 2000 05:18 AM     Click Here to See the Profile for VALENTINEO   Click Here to Email VALENTINEO     Edit/Delete Message   Reply w/Quote
WHAT IS THE MOST COST EFFECTIVE FREQUENCY OF CALIBRATION FOR SMART ELECTRONIC TRANSMITTERS
(PLEASE DISTINGUISH BETWEEN DCS AND IPS TRANSMTTERS)?

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Jerry Eldred
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Posts: 136
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Registered: Dec 1999

posted 21 August 2000 09:23 AM     Click Here to See the Profile for Jerry Eldred   Click Here to Email Jerry Eldred     Edit/Delete Message   Reply w/Quote
That is not a highly difficult answer. But the answer is not completely straightforward, either.

You need to pick a reasonable initial interval. If there is an interval recommended by the manufacturer, that should be the first interval you use. Then monitor their historical ability to stay within your maximum calibration tolerances. Using that historical information, lengthen the interval until they have the percentage probability of remaining in tolerance that you feel comfortable with. This interval truly could be anything from as short as three months to perhaps as long as two years. But you must use either historical data (I described above) or manufacturer's recommendations.

It would not be prudent of me to state a particular generic interval, as it may not be adequate for your use, or for the particular model transmitters you are using. The object is not to find only the most cost-effective, but the most cost-effective that still maintains your desired probability that the units will remain in tolerance for that interval.

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