BS ISO 9846:2025 Solar energy. Calibration of a pyranometer using a pyrheliometer, 2025
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- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Selection of methods
- 5 Alternating sun-and-shade method (shade/unshaded method) [Go to Page]
- 6 Continuous sun-and-shade method (component sum) [Go to Page]
- 7 Collimation tube method [Go to Page]
- 8 Calibration uncertainty
- 9 Certificate of calibration
- Annex A (informative) Shade disc devices and solar tracker alignment
- Annex B (informative) Calculation of the sun incidence angle on an inclined plane
- Annex C (informative) Motivation on number of measurement days
- Annex D (informative) Extended version of the sun-and-shade method
- Annex E (informative) Sample averaging of the alternating sun-and-shade method
- Annex F (informative) The Forgan alternate method
- Annex G (informative) Comparison of the alternating sun-and-shade method (ASSM), continuous sun-and-shade method (CSSM) and collimation tube method (CTM)
- Annex H (informative) Uncertainty evaluation for pyranometer calibration
- Annex I (informative) Introduction of a new pyranometer sensitivity
- Bibliography [Go to Page]