Solar radiation data serves as a crucial foundation for \uae30\uc0c1 \ubaa8\ub2c8\ud130\ub9c1<\/a>, photovoltaic power generation performance evaluation, and scientific research, and the accuracy of this data depends largely on the calibration status of the pyranometer. As sensors are exposed to outdoor environments over long periods, their measurement performance may gradually drift due to factors such as temperature fluctuations, ultraviolet radiation, dust contamination, and component aging. Without regular calibration, measurement errors can typically reach 5% to 15%, or even higher, thereby compromising the reliability of solar resource assessments, power generation forecasts, and long-term climate data analysis.<\/p>\n\n\n\n To ensure the consistency and comparability of solar radiation data obtained from different instruments, regions, and time periods, a comprehensive international system of pyranometer calibration standards has been established. Among these, ISO 9847, ISO 9060, and relevant World Meteorological Organization (WMO<\/a>) specifications provide a unified basis for calibration methods, instrument classification, and data traceability. By adhering to these international standards, users can obtain high-quality, traceable measurement data, providing reliable data support for photovoltaic power plant operations and maintenance, environmental monitoring, and scientific research projects.<\/p>\n\n\n