Download Measurement and Instrumentation. Theory and Application by Alan S. Morris and Reza Langari (Auth.) PDF

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  • April 20, 2017
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By Alan S. Morris and Reza Langari (Auth.)

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The typical unit by which such zero drift is measured is volts/ C. This is often called the zero drift coefficient related to temperature changes. If the characteristic of an instrument is sensitive to several environmental parameters, then it will have several zero drift coefficients, one for each environmental parameter. 7a. 7 Effects of disturbance: (a) zero drift, (b) sensitivity drift, and (c) zero drift plus sensitivity drift. 24 Chapter 2 Sensitivity drift (also known as scale factor drift) defines the amount by which an instrument’s sensitivity of measurement varies as ambient conditions change.

Sensitivity drift is measured in units of the form (angular degree/bar)/ C. 7c. 4 The following table shows output measurements of a voltmeter under two sets of conditions: (a) Use in an environment kept at 20 C which is the temperature that it was calibrated at. (b) Use in an environment at a temperature of 50 C. 1 Determine the zero drift when it is used in the 50 C environment, assuming that the measurement values when it was used in the 20 C environment are correct. Also calculate the zero drift coefficient.

The best way to express this is to assume some midpoint value of calibration error and compensate all measurements by this midpoint error. The maximum measurement error over the full period of time between when the instrument has just been calibrated and time just before the next calibration is due can then be expressed as Æx% of the output reading. 2 The recalibration frequency of a pressure transducer with a range of 0 to 10 bar is set so that it is recalibrated once the measurement error has grown to þ1% of the full-scale reading.

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