ISO 9846:1993 PDF

Solar energy — Calibration of a pyranometer using a pyrheliometer

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Title (English):

ISO 9846:1993

Solar energy — Calibration of a pyranometer using a pyrheliometer

Document status:: Withdrawn
Format:: Electronic (PDF)
Number of pages:: 20
Publication date:: November 25, 1993
Edition:: ISO IS 9846 edition 1 version 1
ICS:: 27.160

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Description (English):

Its use is mandatory for the calibration of secondary standard pyranometers according to ISO 9060, and is recommended for the calibration of pyranometers which are used as reference instruments in comparisons. Is intended for use by test institutions or test laboratories equipped with well-maintained pyrheliometers and is applicable to all pyranometers. The object is to promote the uniform application of reliable methods to calibrate pyranometers, since accurate calibration factors are the basis of accurate hemispherical solar radiation data which are needed for solar energy test applications or simulations.

Technical details

Technical committee: ISO/TC 180/SC 1 - Climate - Measurement and data
SKU: ISO 9846:1993

Abstract

Overview

ISO 9846:1993 - Solar energy: Calibration of a pyranometer using a pyrheliometer specifies standardized, repeatable methods to transfer a direct-solar radiometer scale (pyrheliometer) to a hemispherical radiometer (pyranometer). The standard is mandatory for calibration of secondary standard pyranometers under ISO 9060 and is recommended when pyranometers are used as reference instruments in intercomparisons. Its purpose is to ensure uniform, reliable pyranometer calibration so that hemispherical solar radiation data used for solar energy testing and simulation are accurate and traceable.

Key topics and technical requirements

Calibration principle: Two main methods are described - the alternating sun-and-shade method and the continuous sun-and-shade method - both using a pyrheliometer as the reference and a shade-disc device to measure diffuse irradiance.
Apparatus:
- Reference pyrheliometer (secondary or first class recommended depending on required accuracy).
- Shade disc device positioned perpendicular to the sun’s rays; disc radius r and distance d must ensure the disc masks the sun appropriately (r/d defines an angle matching the pyrheliometer field-of-view; disc radius should exceed the pyranometer dome radius by at least d·tan(0.5')).
- Solar tracker (altazimuth recommended for non-circular receiver symmetry).
- Data acquisition: precise digital voltmeter with ~1 µV resolution and ~0.1% uncertainty at 1100 W·m‑2; synchronized samples within ~1 s; solar elevation calculation accuracy ~0.1°.
Measurement site & conditions:
- Clear or slowly varying sky (scattered clouds permissible if diffuse irradiance remains stable within measurement cycle).
- Distance between instruments should be

Related standards

Mentioned in the description and other ISO standards

Overview

Key topics and technical requirements

Calibration principle: Two main methods are described - the alternating sun-and-shade method and the continuous sun-and-shade method - both using a pyrheliometer as the reference and a shade-disc device to measure diffuse irradiance.
Apparatus:
- Reference pyrheliometer (secondary or first class recommended depending on required accuracy).
- Shade disc device positioned perpendicular to the sun’s rays; disc radius r and distance d must ensure the disc masks the sun appropriately (r/d defines an angle matching the pyrheliometer field-of-view; disc radius should exceed the pyranometer dome radius by at least d·tan(0.5')).
- Solar tracker (altazimuth recommended for non-circular receiver symmetry).
- Data acquisition: precise digital voltmeter with ~1 µV resolution and ~0.1% uncertainty at 1100 W·m‑2; synchronized samples within ~1 s; solar elevation calculation accuracy ~0.1°.
Measurement site & conditions:
- Clear or slowly varying sky (scattered clouds permissible if diffuse irradiance remains stable within measurement cycle).
- Distance between instruments should be

ISO 9846:1993 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Related standards

Abstract

Overview

Key topics and technical requirements

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