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Measurement Uncertainty Basics

Measurement uncertainty expresses the dispersion of values reasonably attributable to a measurand. A budget defines the measurement model, converts sources to standard uncertainties, applies sensitivity coefficients and combines contributions.

Technical publication review required before indexing · Draft reviewed 13 August 2026

Engineering workflow

  1. Define the measurand and model.
  2. Evaluate repeatability statistically where applicable.
  3. Convert certificates, resolution and other Type B sources to standard uncertainties.
  4. Account for sensitivity and correlation.
  5. State combined or expanded uncertainty with coverage information.

Worked example

Standard uncertainties 0.002, 0.0015 and 0.0006 mm combine as √(0.002²+0.0015²+0.0006²) = 0.00257 mm. With k=2, expanded uncertainty is 0.00514 mm.

Build a simple uncertainty budget

Limitations and checks

  • The simple calculator assumes independent linear contributions.
  • Accredited reporting and conformance decisions require controlled procedures.

Relevant AccuTouch next step

Use the calculation as a screening input, then confirm the actual gauge, fixture, software or automation configuration.

Discuss measurement and calibration setup

References