{"id":148,"date":"2026-03-21T12:26:40","date_gmt":"2026-03-21T03:26:40","guid":{"rendered":"https:\/\/www.san-eielectric.co.jp\/am\/?page_id=148"},"modified":"2026-05-25T18:23:30","modified_gmt":"2026-05-25T09:23:30","slug":"summary","status":"publish","type":"page","link":"https:\/\/www.san-eielectric.co.jp\/am\/en\/measurement-reports-index\/irradiance-stability-test-24h-6h\/summary\/","title":{"rendered":"Summary"},"content":{"rendered":"\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>This page summarizes the results of irradiance stability measurements during long-duration illumination for SAN-EI single-lamp AM Solar Simulator models.<\/strong><\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>In this measurement program, two different methods were used to observe the temporal behavior of irradiance.<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><strong>24-hour continuous measurement (24H measurement)<\/strong><br>In this measurement, the pyranometer was installed at the irradiation position and continuously exposed to illumination while irradiance and sensor temperature were recorded over a 24-hour period.<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>6-hour measurement (6H measurement)<\/strong><br>In this measurement, the pyranometer was placed at the irradiation position only during each measurement, and irradiance was manually read at 30-minute intervals.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>During long continuous illumination, the temperature of the pyranometer gradually increases.<br>Therefore, the results of the 24H measurement may include the influence of the temperature characteristics of the pyranometer.<\/strong><\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>For this reason, the results of the 6H measurement are used as the primary indicator for evaluating the stability of the light source itself.<\/strong><\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>The 24H measurement results are used as supplementary information to understand the overall system behavior during long-duration illumination and its relationship with pyranometer temperature.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading has-base-color has-contrast-background-color has-text-color has-background has-link-color has-large-font-size wp-elements-0743ad2165f1b3bdeedff288d3f197f0\" style=\"padding-top:var(--wp--preset--spacing--20);padding-right:var(--wp--preset--spacing--20);padding-bottom:var(--wp--preset--spacing--20);padding-left:var(--wp--preset--spacing--20)\">Measurement Results (6H Stability Comparison)<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>The table below summarizes the results of the 6H measurements for each model.<\/strong> <strong>Irradiance variation is expressed as the percentage deviation relative to the average value during the measurement period.<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table has-medium-font-size\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Model<\/strong><\/td><td><strong>Effective irradiation area<\/strong><\/td><td><strong>Irradiance variation (6H)<\/strong><\/td><td><strong>Maximum deviation<\/strong><\/td><td><strong>Drift<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>IEC class<\/strong><\/td><\/tr><tr><td><strong>XES-20S1<\/strong><\/td><td><strong>20 \u00d7 20 mm<\/strong><\/td><td><strong>\u00b10.36 %<\/strong><\/td><td><strong>0.36 %<\/strong><\/td><td>&#8211;<strong>0.29 %<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>A+<\/strong><\/td><\/tr><tr><td><strong>XES-40S3<\/strong><\/td><td><strong>40 \u00d7 40 mm<\/strong><\/td><td><strong>\u00b10.86 %<\/strong><\/td><td><strong>0.86 %<\/strong><\/td><td><strong>1.43 %<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>A+<\/strong><\/td><\/tr><tr><td><strong>XES-50S2<\/strong><\/td><td><strong>50 \u00d7 50 mm<\/strong><\/td><td><strong>\u00b10.56 %<\/strong><\/td><td><strong>0.56 %<\/strong><\/td><td><strong>0.86 %<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>A+<\/strong><\/td><\/tr><tr><td><strong>XES-50S3<\/strong><\/td><td><strong>50 \u00d7 50 mm<\/strong><\/td><td><strong>\u00b10.22 %<\/strong><\/td><td><strong>0.22 %<\/strong><\/td><td><strong>0.14 %<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>A+<\/strong><\/td><\/tr><tr><td><strong>XES-70S1<\/strong><\/td><td><strong>70 \u00d7 70 mm<\/strong><\/td><td><strong>\u00b10.22 %<\/strong><\/td><td><strong>0.22 %<\/strong><\/td><td>&#8211;<strong>0.29 %<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>A+<\/strong><\/td><\/tr><tr><td><strong>XES-100S1<\/strong><\/td><td><strong>100 \u00d7 100 mm<\/strong><\/td><td><strong>\u00b10.22 %<\/strong><\/td><td><strong>0.22 %<\/strong><\/td><td><strong>0.29 %<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>A+<\/strong><\/td><\/tr><tr><td>XES-160S1<\/td><td><strong>160 \u00d7 160 mm<\/strong><\/td><td><strong>\u00b10.48 %<\/strong><\/td><td><strong>0.48 %<\/strong><\/td><td><strong>-0.43 %<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>A+<\/strong><\/td><\/tr><tr><td><strong>XES-200S1<\/strong><\/td><td><strong>200 \u00d7 200 mm<\/strong><\/td><td><strong>\u00b10.57 %<\/strong><\/td><td><strong>0.57 %<\/strong><\/td><td><strong>1.14 %<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>A+<\/strong><\/td><\/tr><tr><td>XES-250S1<\/td><td><strong>250 \u00d7 250 mm<\/strong><\/td><td><strong>\u00b10.75 %<\/strong><\/td><td><strong>0.75 %<\/strong><\/td><td><strong>0.95 %<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>A+ *1<\/strong><\/td><\/tr><tr><td>XES-300S1<\/td><td><strong>300 \u00d7 300 mm<\/strong><\/td><td><strong>\u00b10.31\uff05<\/strong><\/td><td><strong>0.31 %<\/strong><\/td><td><strong>0.02 %<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>A+<\/strong><\/td><\/tr><tr><td><strong>XES-300S2<\/strong><\/td><td><strong>300 \u00d7 300 mm<\/strong><\/td><td><\/td><td><\/td><td><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><\/tr><tr><td><strong>XES-300S3<\/strong><\/td><td><strong>300 \u00d7 300 mm<\/strong><\/td><td><strong>\u00b10.36 %<\/strong><\/td><td><strong>0.36 %<\/strong><\/td><td><strong>0.14 %<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>A+<\/strong><\/td><\/tr><tr><td><strong>XES-400S1<\/strong><\/td><td><strong>400 \u00d7 400 mm<\/strong><\/td><td><\/td><td><\/td><td><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">The 6-hour measurement results show that all measured models maintained irradiance stability within \u00b11%, corresponding to IEC Class A+ for long-term temporal stability.&nbsp;<br>Although some models showed gradual drift during the measurement period,&nbsp;<br>the results indicate stable irradiance performance across different effective irradiation areas.<br>In some cases, the measured irradiance variation may include the influence of pyranometer temperature.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Values will be updated as measurement results for additional models become available.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">*1 The measured irradiance showed a correlation with pyranometer temperature.<br>A temperature correction was therefore applied using a linear regression derived from the measurement data.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-base-color has-contrast-background-color has-text-color has-background has-link-color has-large-font-size wp-elements-0280f056a1fffe060d54bd8055ac32d2\" style=\"padding-top:var(--wp--preset--spacing--20);padding-right:var(--wp--preset--spacing--20);padding-bottom:var(--wp--preset--spacing--20);padding-left:var(--wp--preset--spacing--20)\">Observations<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">For the models measured so far, the irradiance observed in the 6H measurements remains within a limited range around the average value, and no significant temporal variation has been observed during the measurement period.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">In contrast, the 24H continuous measurements show a gradual change in irradiance together with the increase in pyranometer temperature.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">The results obtained from the Main and Sub pyranometers show generally similar trends, indicating that the observed behavior reflects the characteristics of the measurement system rather than a malfunction of an individual sensor.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-base-color has-contrast-background-color has-text-color has-background has-link-color has-large-font-size wp-elements-496884c5ba51793fcf3a6e9cb8ae4c26\" style=\"padding-top:var(--wp--preset--spacing--20);padding-right:var(--wp--preset--spacing--20);padding-bottom:var(--wp--preset--spacing--20);padding-left:var(--wp--preset--spacing--20)\">Interpretation<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">The gradual variation observed in the 24H measurement is likely influenced by the temperature change of the pyranometer during long-duration illumination.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Therefore, the results of the 24H measurement do not directly represent the variation of the light source output alone.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">In the 6H measurement, the continuous heating of the pyranometer is minimized because the sensor is placed at the irradiation position only during each measurement.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Under this condition, the irradiance remains within a relatively narrow range during the measurement period, indicating that the light source output itself exhibits high stability.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-base-color has-contrast-background-color has-text-color has-background has-link-color has-large-font-size wp-elements-beb156bbe70fe7bbc052b9bad614312e\" style=\"padding-top:var(--wp--preset--spacing--20);padding-right:var(--wp--preset--spacing--20);padding-bottom:var(--wp--preset--spacing--20);padding-left:var(--wp--preset--spacing--20)\">Conclusion<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">For the SAN-EI single-lamp AM Solar Simulator models measured so far, the results of the 6H measurements confirm that irradiance during operation remains within a narrow range around the average value, indicating stable light source output.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">The results of the 24H continuous measurements also provide useful information for understanding the behavior of the system during long-duration illumination and its relationship with pyranometer temperature.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">This page will be updated as additional measurement results become available.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><a href=\"https:\/\/www.san-eielectric.co.jp\/am\/en\/measurement-reports-index\/irradiance-stability-test-24h-6h\/\" data-type=\"page\" data-id=\"147\">Return to INDEX<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This page summarizes the results of irradiance stability measurements during long-duration illumination for SA [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":147,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-148","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.san-eielectric.co.jp\/am\/wp-json\/wp\/v2\/pages\/148","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.san-eielectric.co.jp\/am\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.san-eielectric.co.jp\/am\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.san-eielectric.co.jp\/am\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.san-eielectric.co.jp\/am\/wp-json\/wp\/v2\/comments?post=148"}],"version-history":[{"count":9,"href":"https:\/\/www.san-eielectric.co.jp\/am\/wp-json\/wp\/v2\/pages\/148\/revisions"}],"predecessor-version":[{"id":1600,"href":"https:\/\/www.san-eielectric.co.jp\/am\/wp-json\/wp\/v2\/pages\/148\/revisions\/1600"}],"up":[{"embeddable":true,"href":"https:\/\/www.san-eielectric.co.jp\/am\/wp-json\/wp\/v2\/pages\/147"}],"wp:attachment":[{"href":"https:\/\/www.san-eielectric.co.jp\/am\/wp-json\/wp\/v2\/media?parent=148"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}