ANSI/IES TM-31-20(R26) | Technical Memorandum: Measurement Uncertainty for Lighting Equipment Calibration Using Integrating Spheres | An American National Standard | Illuminating Engineering Society

Technical Memorandum: Measurement Uncertainty for Lighting Equipment Calibration Using Integrating Spheres

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ANSI/IES TM-31-20(R26)
Document Type: Technical Memorandum (TM)

Available as a downloadable secure PDF only.

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SKU: ANSI/IES TM-31-20(R26) Category: Tag:

Product Description

Approved American National StandardIntended Audience: Testing laboratories, energy efficiency organizations and regulators, manufacturers of lighting products, lighitng specifiers.
Intended Interest Categories: Specifier (US), Affected (UA), Public Interest (UP), Academic, Research (GAR), Government, Regulatory (GGR), General SME (GSME), Organizational (OM), Testing Equipment Users (TEU), Testing Equipment Manufacturers (TEM).
Description: A common approach to the uncertainty analysis for calibration of lumen measuring equipment (integrating spheres) with standard incandescent lamps, including halogen, that have been assigned values of total luminous flux and/or total spectral radiant flux.

Page count: 81 pages
Publisher: Illuminating Engineering Society (2026)
SKU: ANSI/IES TM-31-20(R26)
ISBN-13: 978-0-87995-513-7
Previous edition: TM-31-20

Chapters:

  • 1.0 Scope
  • 2.0 Normative References
  • 3.0 Definitions
  • 4.0 Guide to the Expression of Uncertainty in Measurement (GUM): A Summary
  • 5.0 Calibration of Integrating Spheres
  • 6.0 Calibration of Working Standard Lamps Using an Integrating Sphere
  • Annex A – Tolerance, Uncertainty, and Confidence Intervals
  • Annex B – Partial Derivatives
  • Annex C – Sensitivity Coefficients Calculated as Slopes
  • Annex D – Total Spectral Radiant Flux Data Measured with an Array Spectrometer and Integrating Sphere
  • Annex E – Total Spectral Radiant Flux Data and Signal for Working Standard Lamp Transfer

Citation Format:
Illuminating Engineering Society. ANSI/IES TM-31-20(R26), Technical Memorandum: Measurement Uncertainty for Lighting Equipment Calibration Using Integrating Spheres. New York: IES; 2026.