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Photovoltaic devices - Part 7: Computation of the spectral mismatch correction for measurements of photovoltaic devices
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Photovoltaic devices -- Part 7: Computation of spectral mismatch error introduced in the testing of a photovoltaic device
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Basic data
| Standard ID | GB/T 6495.7-2025 (GB/T6495.7-2025) |
| Description (Translated English) | Photovoltaic devices - Part 7: Computation of the spectral mismatch correction for measurements of photovoltaic devices |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | K83 |
| Classification of International Standard | 27.160 |
| Word Count Estimation | 14,136 |
| Date of Issue | 2025-12-31 |
| Date of Implementation | 2026-07-01 |
| Older Standard (superseded by this standard) | GB/T 6495.7-2006 |
| Issuing agency(ies) | State Administration for Market Regulation, Standardization Administration of China |
GB/T 6495.7-2025: Photovoltaic devices - Part 7: Computation of the spectral mismatch correction for measurements of photovoltaic devices
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 27.160
CCSK83
National Standards of the People's Republic of China
Replaces GB/T 6495.7-2006
Photovoltaic Devices Part 7.Measurements of Photovoltaic Devices
Spectral mismatch correction calculation method
(IEC 60904-7.2019, IDT)
Published on 2025-12-31
Implemented on July 1, 2026
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Table of contents
Preface III
Introduction IV
1.Scope 1
2 Normative References 1
3.Terms and Definitions 1
4.Method Description 2
5.Determination of Spectral Response 3
6.Determination of the test spectrum 3
7.Determination of Spectral Mismatch Coefficient 3
7.1 General Rules 3
7.2 Simplified Formula for Thermopile Detector (Total Radiation Meter) 4
8 Report 5
References 6
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents".
Drafting.
This document is Part 7 of GB/T 6495 "Photovoltaic Devices". GB/T 6495 has already published the following parts.
---Part 1.Measurement of Photovoltaic Current-Voltage Characteristics;
---Part 1-1.Measurement of Current-Voltage Characteristics of Multijunction Photovoltaic Devices;
---Part 2.Requirements for Standard Photovoltaic Devices;
---Part 3.Measurement Principle of Ground-Based Photovoltaic Devices Based on Standard Spectral Irradiance Data;
---Part 5.Determining the Equivalent Cell Temperature (ECT) of Photovoltaic Devices Using the Open-Circuit Voltage Method;
---Part 7.Calculation Method for Spectral Mismatch Correction in Photovoltaic Device Measurements;
---Part 8.Measurement of the Spectral Response of Photovoltaic Devices;
---Part 8-1.Measurement of the Spectral Response of Multijunction Photovoltaic Devices;
---Part 9.Solar Simulator Characteristic Classification;
---Part 10.Methods for measuring linear correlation and linearity;
---Part 11.Initial light-induced degradation test method for crystalline silicon solar cells.
This document replaces GB/T 6495.7-2006 "Photovoltaic Devices - Part 7.Spectral Mismatch Errors Caused During Photovoltaic Device Measurements".
Compared with GB/T 6495.7-2006, the main technical changes in the "Calculation of..." are as follows, apart from structural adjustments and editorial modifications.
a) The scope has been changed (see Chapter 1, Chapter 1 of the.2006 edition);
b) Added terms and definitions (see Chapter 3);
c) The "Method Description" has been revised to introduce the concept of mismatch factor (see Chapter 4, Chapter 3 of the.2006 edition);
d) Added "Determination of Spectral Response" (see Chapter 5);
e) Added "Determination of Test Spectra" (see Chapter 6);
f) Added "Determination of Spectral Mismatch Coefficient" (see Chapter 7);
g) A “Report” has been added (see Chapter 8).
This document adopts IEC 60904-7.2019 "Photovoltaic devices - Part 7.Calculation of spectral mismatch correction for photovoltaic device measurements".
Law".
The following editorial changes have been made to this document.
---Adjust the scope of the chapter description;
---The term "spectral irradiance" has been added, and the annotation of the IEC standard is placed under this term.
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed by the Ministry of Industry and Information Technology of the People's Republic of China.
This document is under the jurisdiction of the National Technical Committee on Standardization of Solar Photovoltaic Energy Systems (SAC/TC90).
This document was drafted by. China Electronics Technology Standardization Institute, Fujian Provincial Institute of Metrology, and Guangdong Product Quality Supervision and Inspection Institute.
Research Institute, National Institute of Metrology, Wuxi Institute of Inspection, Testing and Certification, Beijing Jianheng Certification Center Co., Ltd., Zhejiang Aiko Solar Energy
Technology company.
The main drafters of this document are. Liu Yu, Li Jiansheng, Lin Rongchao, Chen Xiaoda, Cai Chuan, Zhao Xiang, Wang Yilun, Zeng Chanjuan, Qiu Kaifu, and Duan Shaojing.
The release history of this document and the document it replaces is as follows.
---First published as GB 6495-1986 in 1986, and revised for the first time in.2006;
---This is the second revision.
Introduction
GB/T 6495 proposes methods for measuring the performance of photovoltaic devices, as well as standards, value transfer, and result correction related to performance measurement.
The requirements for the classification of testing equipment, etc., have positive guiding significance for the performance measurement of photovoltaic devices such as photovoltaic cells and photovoltaic modules.
GB/T 6495 is proposed to consist of the following parts.
---Part 1.Measurement of Photovoltaic Current-Voltage Characteristics. The purpose is to define the basic requirements for measuring the IV curve of photovoltaic devices.
---Part 1-1.Measurement of Current-Voltage Characteristics of Multijunction Photovoltaic Devices. The purpose is to specify the measurement of the IV characteristics of multijunction photovoltaic devices.
Quantification method.
---Part 1-2.Measurement of Current-Voltage Characteristics of Bifacial Photovoltaic Devices. The purpose is to specify the IV characteristic measurement of bifacial photovoltaic modules.
Quantification method.
---Parts 1-3.Measurement of Current-Voltage Characteristics of Curved Photovoltaic Devices. The purpose is to specify the measurement of the IV characteristics of curved photovoltaic devices.
Quantification method.
---Part 2.Requirements for Standard Photovoltaic Devices. The purpose is to specify the requirements for standard photovoltaic devices.
---Part 3.Measurement Principles of Ground-Based Photovoltaic Devices Based on Standard Spectral Irradiance Data. The aim is to provide standard photovoltaic irradiance data.
Degree data.
---Part 4.Procedures for Establishing Standard Photovoltaic Device Calibration Traceability. The purpose is to establish traceability for photovoltaic device calibration.
program.
---Part 5.Determining the Equivalent Cell Temperature (ECT) of Photovoltaic Devices Using the Open-Circuit Voltage Method. The aim is to define the equivalent cell temperature (ECT) of photovoltaic devices.
Method for testing the open-circuit voltage of battery temperature.
---Part 7.Calculation Method for Spectral Mismatch Correction in Photovoltaic Device Measurements. The purpose is to specify the calculation method for spectral mismatch correction.
---Part 8.Measurement of the Spectral Response of Photovoltaic Devices. The purpose is to specify the methods for measuring the spectral response.
---Part 8-1.Measurement of the Spectral Response of Multijunction Photovoltaic Devices. The purpose is to specify the measurement method for the spectral response of multijunction photovoltaic devices.
method.
---Part 9.Classification of Solar Simulator Characteristics. The purpose is to specify the classification requirements for solar simulators used to measure photovoltaic devices.
---Part 10.Methods for Measuring Linear Correlation and Linearity Characteristics. The aim is to define the linearity characteristics of photovoltaic devices and their testing.
method.
---Part 11.Test Method for Initial Light-Induced Degradation of Crystalline Silicon Solar Cells. The purpose is to specify the initial light-induced degradation test method for crystalline silicon solar cells.
Attenuation test method.
---Part 12.Measurement methods for the current-voltage (IV) characteristics of perovskite photovoltaic cells and modules. The purpose is to specify the measurement methods for the current-voltage (IV) characteristics of perovskite photovoltaic cells and modules.
Methods for measuring the IV characteristics of voltage-voltage devices.
---Part 13.Electroluminescence of Photovoltaic Modules. The purpose is to specify the testing methods for the electroluminescence of photovoltaic modules.
Note. The correspondence between each part and the IEC 60904 series of international standards is as follows.
---Part 1 corresponds to IEC 60904-1;
---Part 1-1 corresponds to IEC 60904-1-1;
---Parts 1-2 correspond to IEC 60904-1-2;
---Parts 1-3 correspond to IEC 60904-1-3;
---Part 2 corresponds to IEC 60904-2;
---Part 3 corresponds to IEC 60904-3;
---Part 4 corresponds to IEC 60904-4;
---Part 5 corresponds to IEC 60904-5;
---Part 7 corresponds to IEC 60904-7;
---Part 8 corresponds to IEC 60904-8;
---Part 8-1 corresponds to IEC 60904-8-1;
---Part 9 corresponds to IEC 60904-9;
---Part 10 corresponds to IEC 60904-10;
---Part 13 corresponds to IEC 60904-13.
The purpose of this document is to address spectral discrepancies between the test spectrum and the reference spectrum, as well as between the reference device SR and the device under test SR.
Matching provides guidelines for correcting spectral mismatch errors. The calculated spectral mismatch correction applies only to measurements performed with the specific test spectrum.
A specific combination of test and reference devices.
Because photovoltaic devices have wavelength-dependent spectral responsivity, their performance is significantly affected by the spectral distribution of incident radiation.
Under light, the spectral distribution of incident radiation varies with multiple factors such as location, weather, time of year, time of day, and orientation of the receiving surface.
The characteristics of solar simulators vary depending on their type and conditions. This is especially true if a thermopile radiometer (non-spectrally selective radiometer) is used.
To measure irradiance using a standard photovoltaic device (IEC 60904-2), the spectral irradiance distribution of the incident light must be known in order to perform necessary corrections.
The performance of photovoltaic devices is obtained under the reference spectral irradiance distribution defined in IEC 60904-3.
If standard photovoltaic devices or thermopile detectors are used to measure its radiation, the necessary parameters can be calculated according to the procedures given in this document.
Spectral mismatch correction is performed to obtain the device under test under the reference spectral irradiance distribution in IEC 60904-3 or any other reference spectrum.
Short-circuit current. If the reference photovoltaic device has the same relative spectral responsivity as the device under test, the reference device automatically takes into account the measured light.
The deviation between the spectral irradiance distribution and the reference spectral irradiance distribution is not required, and no further correction for spectral mismatch error is needed. In this case...
In this case, when the reference device method is used for performance measurements under natural sunlight, location and weather conditions are not important. Furthermore, for the same...
The relative spectral responsivity and the spectral classification of the simulator are not important for measurements by the solar simulator.
If a known spectral irradiance distribution is used to measure the performance of a photovoltaic device, then the spectral responsivity of the photovoltaic device under test can be used.
To calculate the short-circuit current under any other spectral irradiance distribution.
Photovoltaic Devices Part 7.Measurements of Photovoltaic Devices
Spectral mismatch correction calculation method
1 Scope
This document specifies the procedures for testing photovoltaic devices when the test spectrum does not match the standard spectrum (e.g., AM1.5 spectrum) and the standard device...
A method for correcting spectral mismatch error caused by mismatch between the spectral response (SR) and the device under test is proposed, aiming to reduce system uncertainty.
Determination.
This document applies to spectral mismatch correction for single-junction photovoltaic devices; it can also be used as a reference for multi-junction photovoltaic devices.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
ry)
Note. GB/T 46982-2025 Temperature and Irradiance Correction Methods for IV Characteristics of Photovoltaic Devices (IEC 60891.2021, IDT)
Note. GB/T 6495.1-2025 Photovoltaic devices - Part 1.Measurement of photovoltaic current-voltage characteristics (IEC 60904-1.2020, IDT)
IEC 60904-8 Photovoltaic devices - Part 8.Measurement of the spectral response of photovoltaic devices
Note. GB/T 6495.8-2025 Photovoltaic devices - Part 8.Measurement of spectral response of photovoltaic devices (IEC 60904-8.2014, IDT)
IEC 60904-8-1 Photovoltaic devices – Part 8-1.Measurement of the spectral response of multijunction photovoltaic devices
Note. GB/T 6495.801-2025 Photovoltaic devices - Part 8-1.Measurement of spectral response of multijunction photovoltaic devices (IEC 60904-8-1.2017, IDT)
Note. GB/T 6495.9-2025 Photovoltaic devices - Part 9.Characteristic classification of solar simulators (IEC 60904-9.2020, IDT)
Note. GB/T 2297-2025 Terminology for Solar Photovoltaic Energy Systems (IEC TS61836.2025, NEQ)
3 Terms and Definitions
The terms and definitions defined in IEC TS61836 and ISO 9288, as well as the following terms and definitions, apply to this document.
The URLs for the terminology databases maintained by ISO and IEC for standardization are as follows.
...
