{"id":230,"date":"2026-04-03T11:34:53","date_gmt":"2026-04-03T02:34:53","guid":{"rendered":"https:\/\/www.san-eielectric.co.jp\/am\/?page_id=230"},"modified":"2026-05-21T12:14:29","modified_gmt":"2026-05-21T03:14:29","slug":"edition-b","status":"publish","type":"page","link":"https:\/\/www.san-eielectric.co.jp\/am\/en\/standards\/edition-b\/","title":{"rendered":"Edition B"},"content":{"rendered":"\n
\n

INDEX<\/strong><\/h2>\n\n\n\n
\n

<\/a>Preface<\/a><\/p>\n\n\n\n

Acknowledgement<\/a><\/p>\n\n\n\n

<\/a>Positioning of This Document<\/a><\/p>\n\n\n\n

<\/a>Definition of AM0 (1 SUN = 1348 W\/m\u00b2)<\/a><\/p>\n\n\n\n

T<\/a>Measurement Principle and Detector Considerations<\/a><\/p>\n\n\n\n

Spectral Match Classification<\/a><\/p>\n\n\n\n

Irradiance Uniformity and Stability<\/a><\/p>\n\n\n\n

Relationship with Chinese GB\/T Standards<\/a><\/p>\n\n\n\n

Experimental Verification Summary<\/a><\/p>\n\n\n\n

Standardization Perspective<\/a><\/p>\n\n\n\n

Ethical and Peaceful Use Statement<\/a><\/p>\n\n\n\n

Conclusion<\/a><\/p>\n<\/div>\n<\/div>\n\n\n\n

1. Preface<\/h2>\n\n\n\n

This revised Edition-B clarifies the scientific positioning of SAN-EI AM Solar Simulator Standards 2025-04 in relation to internationally recognized photovoltaic standards.<\/p>\n\n\n\n

The objective of this document is:<\/p>\n\n\n\n

\u2022 To clarify the physical definition of AM0 irradiance<\/p>\n\n\n\n

\u2022 To ensure methodological alignment with IEC spectral evaluation principles<\/p>\n\n\n\n

\u2022 To distinguish clearly between IEC-defined classifications and SAN-EI internal extended classifications<\/p>\n\n\n\n

\u2022 To improve transparency and international comparability<\/p>\n\n\n\n

This document is intended as a technical clarification. It does not replace, redefine, or supersede any existing international standard.<\/p>\n\n\n\n

2. Acknowledgement<\/h2>\n\n\n\n

SAN-EI ELECTRIC expresses its sincere gratitude to<\/p>\n\n\n\n

Dr. Harald M\u00fcllejans<\/p>\n\n\n\n

European Commission \u2013 Joint Research Centre (JRC)<\/p>\n\n\n\n

for his valuable technical comments and guidance.<\/p>\n\n\n\n

His observations regarding spectral fidelity and measurement transparency contributed significantly to improving the clarity and positioning of this revision. Responsibility for the final content remains solely with SAN-EI ELECTRIC CO., LTD.<\/p>\n\n\n\n

3. Positioning of This Document<\/h2>\n\n\n\n

International standards such as:<\/p>\n\n\n\n

\u2022 IEC 60904-3 (AM1.5G reference spectrum)<\/p>\n\n\n\n

\u2022 IEC 60904-9 (solar simulator performance requirements)<\/p>\n\n\n\n

\u2022 ASTM G173 (terrestrial reference spectral irradiance)<\/p>\n\n\n\n

\u2022 ASTM E490 (extraterrestrial reference spectral irradiance)<\/p>\n\n\n\n

define reference spectra and evaluation criteria primarily for AM1.5G conditions.<\/p>\n\n\n\n

At present, IEC does not define an operational AM0 irradiance constant for simulator calibration. This document adopts ASTM reference data to clarify AM0 definition while maintaining methodological compatibility with IEC evaluation frameworks.<\/p>\n\n\n\n

4. Definition of AM0 (1 SUN = 1348 W\/m\u00b2)<\/h2>\n\n\n\n

AM0 irradiance is adopted as<\/p>\n\n\n\n

1348 W\/m\u00b2 integrated over 280\u20134000 nm<\/p>\n\n\n\n

derived from the latest ASTM E490 extraterrestrial reference spectrum.<\/p>\n\n\n\n

Clarification<\/p>\n\n\n\n

\u2022 IEC standards define AM1.5G, not AM0<\/p>\n\n\n\n

\u2022 The value 1348 W\/m\u00b2 is derived strictly from ASTM reference integration<\/p>\n\n\n\n

\u2022 The integration range (280\u20134000 nm) is selected for methodological consistency with AM1.5G evaluation principles \u2022 This document does not establish a new international solar constant<\/p>\n\n\n\n

5. Measurement Principle and Detector Considerations<\/h2>\n\n\n\n

5.1 Detector Sensitivity<\/h3>\n\n\n\n

Typical AM1.5G reference detectors:<\/p>\n\n\n\n

\u2022 Silicon-based<\/p>\n\n\n\n

\u2022 Effective response range: 400\u20131100 nm<\/p>\n\n\n\n

Full integration range (280\u20134000 nm) exceeds this response window. Therefore calibration relies on spectral integration ratios derived from reference data.<\/p>\n\n\n\n

5.2 AM0 \/ AM1.5G Ratio<\/h3>\n\n\n\n

From ASTM reference integration:<\/p>\n\n\n\n

280\u20134000 nm<\/p>\n\n\n\n

AM1.5G = 1000.37 W\/m\u00b2<\/p>\n\n\n\n

AM0 = 1347.93 W\/m\u00b2<\/p>\n\n\n\n

400\u20131100 nm<\/p>\n\n\n\n

AM1.5G = 759.01 W\/m\u00b2 AM0 = 908.13 W\/m<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Ratio<\/p>\n\n\n\n

908.13 \/ 759.01 = 1.20<\/p>\n\n\n\n

When using an AM1.5G-calibrated Si detector, a signal 1.20\u00d7 higher corresponds approximately to AM0 1 SUN.<\/p>\n\n\n\n

Scientific Note This ratio represents a practical calibration method and does not replace full-spectrum radiometric measurement.<\/p>\n\n\n\n

6. Spectral Match Classification<\/h2>\n\n\n\n

6.1 IEC Classification (Reference)<\/h3>\n\n\n\n