ASTM-E941 Standard Test Method for Calibration of Reference Pyranometers With Axis Tilted by the Shading Method (Withdrawn 2005)

ASTM-E941 - 1983 EDITION - SUPERSEDED -- See the following: ASTM-G167
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Standard Test Method for Calibration of Reference Pyranometers With Axis Tilted by the Shading Method (Withdrawn 2005)

Scope

1.1 This test method covers all pyranometers having calibrations sensitive to tilt.

1.2 This test method combines measurement and calculation, yielding calibration factors derived from many measurements and identified with either a single tilt angle or at normal incidence with one or only a few specific angles of tilt.

1.3 This test method is applicable to reference pyranometers regardless of the radiation receptor employed.

1.4 Two types of calibrations are covered: Type I employs a self-calibrating pyrheliometer, and Type II calibrations employ a secondary reference pyrheliometer as the standard instrument.

1.5 This test method provides for calibration at fixed south facing tilts from the horizontal with instrument constant data obtained at various angles of incidence throughout the day at that tilt.

1.6 Calibration of reference pyranometers may be performed by a method in which the axis of the sensitive element is aligned with the sun during the shading disk test. This procedure avoids the effect of cosine errors, but emphasizes the importance of tilt corrections.

1.7 The calibration of reference pyranometers at horizontal, that is, with axis vertical, is covered in another ASTM standard (see Section 2).

1.8 This test method is applicable only to calibration procedures using light from the sun.

Keywords

Calibration-nuclear analysis instrumentation; reference pyranometers with axis tilted (by shading method), test,; Irradiance/irradiation-solar; Pyranometer method; Pyrheliometers; Radiation exposure-solar collectors/analysis; Shading method; Solar collectors; Solar spectral irradiance; calibration of reference pyranometers with axis tilted (by shading; method), test; ICS Number Code 27.160 (Solar energy engineering)

To find similar documents by ASTM Volume:

14.04 (Laboratory Apparatus; Degradation of Materials; SI; Oxygen Fire Safety)

To find similar documents by classification:

27.160 (Solar energy engineering Including photovoltaic energy systems)

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This document is available in Paper format.

Document Number

ASTM-E941-83

Revision Level

1983 EDITION

Status

Superseded

Modification Type

Replaced

Publication Date

April 29, 1983

Document Type

Test Method

Page Count

13 pages

Committee Number

G03.09