SAN-EI 2025-04

INDEX

1. Preface

From April 1, 2025, SAN-EI will evaluate all SAN-EI AM Solar Simulators in accordance with “IEC 60904-9:2020” and our in-house standard “SAN-EI 2025-04”.

These standards also apply to the maintenance required to preserve the performance of SAN-EI AM Solar Simulators.

About “SAN-EI 2025-04”

Note: This document follows “IEC 60904-9:2020” and includes additional requirements specified in “SAN-EI 2025-04” where applicable.

・ Based on customer requests across various fields, we established this in-house standard in April 2025 to evaluate solar-simulator performance under conditions not fully addressed by conventional standards.

・ “SAN-EI 2025-04” was developed with reference to “IEC 60904-9:2020”.

・ The content will be updated in line with changes in international standards and customer requirements (the document name may also be updated accordingly).

・ Measurement and evaluation at SAN-EI are performed as follows:

・ “AM1.5G 300–1200 nm” is based on “IEC 60904-9:2020”.

・ “AM1.5G 300–1800 nm and 300–2200 nm” complies with “SAN-EI 2025-04”.

・ “300–1200 nm, 300–1800 nm and 300–2200 nm at AM0” comply with “SAN-EI 2025-04”.

・ Measurement and evaluation of AM1.5G and AM0 are performed as follows.

2. Setting “Reference Irradiance” for Measurement

◆Measurement Receiver : Pyranometer or Reference Cell

・When “Effective Irradiation Surface” is □40 mm to □50 mm, we use Pyranometer.

・When “Effective Irradiation Surface” is □70 mm to □400 mm, we use Reference Cell.

◆Measurement Position (Working Distance)

・Measurement Receiver is placed so that its light-receiving surface (sensor surface) is at Working Distance.

◆Measurement Position (on Irradiation Surface)

・Center of Effective Irradiation Surface

(Note)

Work Procedure

① Wait until Lamp turns on and becomes “Stable” (20 to 30 minutes).

② Using Measuring Receiver, measure Irradiance at 5 points shown in the figure.

③ Non-uniformity among the 5 points is calculated as follows:

(Maximum − Minimum) / (Maximum + Minimum) × 100 (%)

④ Adjust Lamp Position so that the calculated value is 1.5％ or less.

【AM1.5G】

⑤ Adjust Lamp Current so that Center Measurement Value becomes Sensitivity Constant.　

◆Reference Irradiance

・1000 W/m²（±5％）

・Irradiance is adjusted based on Sensitivity Constant.　　

【AM0】

⑤ Adjust Lamp Current so that the receiver output (voltage) at the center becomes 1.20 × V₁₀₀₀,

where V₁₀₀₀ is the output at 1000 W/m² under AM1.5G using the same receiver.

◆Reference Irradiance

・1348 W/m²（±5％）　—-This value is defined as “1 SUN of AM0”.※❶

・Adjust Irradiance so that Output Voltage of Measurement Receiver is 1.2 times Sensitivity Constant.※❷

※❶　Reason why “1 SUN of AM0” is “1348 W/m²”

It is well known that “1 SUN of AM1.5G” is “1000 W/m²”.

This is “Total Radiant Energy Value from 280 to 4000 nm” based on “ASTM G173-03.”

（”ASTM G173-03″ is data on AM1.5G Radiant Energy.）

Similarly, “Total Radiant Energy from 280 to 4000 nm” of “ASTM E-490” is “1348 W/m².”

（”ASTM E-490″ is data for AM0 Radiant Energy.）

※❷　Reason for setting “1.2 times Sensitivity Constant as 1 SUN of AM0”

・There is no dedicated Measuring Device for Measuring AM0 Light.

・Reference Cells and Pyranometers (silicon type) can only measure in 400-1100 nm range.

・Total Radiant Energy Value of “ASTM G173-03” in “400-1100 nm” range is “759 W/m²”.

・Total Radiant Energy Value of “ASTM E-490” in “400-1100 nm” range is “908 W/m²”.

・「908 W/m²」÷「759 W/m²」＝1.20

・Radiant Energy of AM0 at “400-1100 nm” is 1.2 times that of AM1.5G.

・Therefore, “Radiant Energy that is 1.2 times Sensitivity Constant of Measuring Receiver”is defined as “1348 W/m².”

（Note）

It only applies to Light with “Spectral Match of 75-125％.”

3.Spectral Match

（１）Preparation before Measurement

◆Measurement Receiver : Pyranometer or Reference Cell

・When “Effective Irradiation Surface” is □40 mm to □50 mm, a Pyranometer is used.

・When “Effective Irradiation Surface” is □70 mm to □400 mm, a Reference Cell is used.

◆Measurement Position (Working Distance)

・Measurement Receiver is placed so that its light-receiving surface (sensor surface) is at Working Distance.

◆Measurement Position (on Irradiation Surface)

・Center of Effective Irradiation Surface

◆Reference Irradiance

【AM1.5G】

・1000 W/m²（±5％）

・Irradiance is adjusted based on Sensitivity Constant.　　

【AM0】

・1348 W/m²（±5％）

・Adjust Lamp Current so that the receiver output (voltage) at the center becomes 1.20 × V₁₀₀₀,

where V₁₀₀₀ is the output at 1000 W/m² under AM1.5G using the same receiver.

（２）Measurement and Recording

◆Using Spectrometer, measure and record Irradiance in the range 300–2200 nm at 1 nm intervals.

◆Measurement positions are as follows:

・When Effective Irradiation Surface is □40 mm to □100 mm, only Center in the figure below.

・When Effective Irradiation Surface is □160 mm to □400 mm, 4 points in the figure below.

◆Except for Center, the light-receiving surface edge of Spectrometer is made to contact

Effective Irradiation Surface Edge.

（３）Organizing Measurements

◆Organize the data for each of 4 measurement points. (When Effective Irradiation Surface is □40mm-□100mm, only Center.)

◆Calculate Interval Sum for each Wavelength.

◆Calculate Sum of each Wavelength Range as shown in the table below.

◆Calculate Percentage for each Wavelength Range using the following formula.

◆The following formula is used to calculate “Spectral Match”

◆Extract Minimum and Maximum values from “Spectral Matches” for each Wavelength Range.

◆Extract Minimum and Maximum values at each Measurement Position (1 or 4).

◆Minimum and Maximum of all measurements is taken as “Spectral Match” for that product.

（４）Evaluation

◆Range (Minimum to Maximum) of “Spectral Match” determined above is evaluated based on the table below.

(Note)

IEC-defined grades (AM1.5G, 300–1200 nm): A+, A, B, C. This document also defines A++ as an enhanced grade stricter than IEC A+.
SAN-EI-defined grades (300–1800 nm and 300–2200 nm): S/S+/S++ and SS/SS+/SS++.

for extended wavelength ranges (300–1800 nm and 300–2200 nm).

Grades B and C are IEC-compatible and apply only to the 300–1200 nm column.