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This document specifies methods for determining the response time of pyranometers using artificial or natural light source.
Artificial light sources refer to any man-made devices that generate the necessary radiation; natural light sources, by contrast, are those that rely on the sun.
These test methods establish a standardized procedure for testing, applicable to manufacturers, calibration service providers, and end-users. Their implementation ensures fair competition, guarantees product quality, and promotes consistent and reliable testing practices.
While the test methods are applicable in principle to all types of pyranometers, the validation described herein is currently complete only for pyranometers with analogue outputs. Full validation for digital pyranometers remains pending, primarily due to the following considerations:
a) The integrated digital data logger forms an intrinsic part of the digital pyranometer system. Consequently, the entire system must be considered during response time testing.
b) Testing must be conducted under conditions that represent the pyranometer's operational state in end-user applications.
The response time test result is expressed in seconds accompanied with its measurement uncertainty.
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