Stability

The UNI 4546 defines stability as follows: "The attitude of an instrument to provide readings a little different between them, in readings independently performed on the same measurand within a defined time interval, with a unified process and under the same conditions for influence quantities". The stability of a measuring instrument is essentially the ability to maintain its metrological characteristics over time. Stability is also called "drift"; in fact, the instrument drift is defined as the time variation of an indication, due to variations in metrological properties of a measuring instrument. Therefore, stability can be obtained by comparing two calibration curves performed at different times but made under the same conditions. (see chart below).

 

 

 

 

 

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  1. Why should I calibrate the instrument?
  2. How often should I calibrate the instrument?
  3. Metrological validation
  4. Measurement uncertainty
  5. Metrological requirements verification
  6. Metrological features
  7. Linearity
  8. Hysteresis
  9. Stability
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