Guide for the uncertainty analysis in pressure

By M Finch, Fluke Precision Measurement


Published in:

Electricity+Control, June 2014 (pages 22-30)



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Uncertainty using the full correction method is typically consistent from one P3000 DWT to another, because variances in piston characteristics and mass adjustments are corrected mathematically. Uncertainties compiled for the partial and no correction methods are based on worst case, uncorrected variances. Actual performance may be significantly better than the worst case uncertainty reported. If improved uncertainty is desired, a detailed analysis should be performed for the individual DWT.


Take note

  • The pressure balance is a fundamental instrument.
  • In all measurement, there is a degree of uncertainty
  • Uncertainty can be compensated for.