Cost Effective Calibration Intervals Using Weibull Analysis
- Publication:
- World Conference on Quality and Improvement
- Date:
- May 1995
- Issue:
- Volume 49 Issue
- Pages:
- pp. 1026-1038
- Author(s):
- Barringer, H. Paul
- Organization(s):
- Barringer & Associates, Humble, TX 77347-3985
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Abstract
Calibration establishes the relationship between measured values and the corresponding known values of a measurand (RP-1 1989). This knowledge determines how to make an instrument conform to a known measurement input with only small errors between the instrument and the standard measurement. This paper describes how to find an appropriate cost effective interval.
The following information was gathered to study Weibull statistics and cost reduction opportunities for recalibration efforts: (1) recalibration costs by business size and business complexity, (2) calibration data on age to failure for a pressure gage, (3) a frequency table for 5" and 8" Micrometer Standard Bar Errors at Annual Recalibration-Raw Data, (4) a frequency table for 5" and 8" Micrometer Standard Bar Errors at Annual Recalibration-Absolute Data, and (5) sorted values of synthetic age to failure.
The Weibull statistics and commercially-available software in the cases presented illustrate cost-reduction opportunities.