ASTM E973-10

Standard Test Method for Determination of the Spectral Mismatch Parameter Between a Photovoltaic Device and a Photovoltaic Reference Cell

SIGNIFICANCE AND USE
The calculated error in the photovoltaic device current determined from the spectral mismatch parameter can be used to determine if a measurement will be within specified limits before the actual measurement is performed.
The spectral mismatch parameter also provides a means of correcting the error in the measured device current due to spectral mismatch.
The spectral mismatch parameter is formulated as the fractional error in the short-circuit current due to spectral differences. ,  
Error due to spectral mismatch can be corrected by dividing the measured photovoltaic cell current by M, a procedure used in Test Methods E948 and E1036.
SCOPE
1.1 This test method covers a procedure for the determination of a spectral mismatch parameter used in performance testing of photovoltaic devices.
1.2 The spectral mismatch parameter is a measure of the error, introduced in the testing of a photovoltaic device, caused by mismatch between the spectral responses of the photovoltaic device and the photovoltaic reference cell, as well as mismatch between the test light source and the reference spectral irradiance distribution to which the photovoltaic reference cell was calibrated. Examples of reference spectral irradiance distributions are Tables E490 or G173.
1.3 The spectral mismatch parameter can be used to correct photovoltaic performance data for spectral mismatch error.
1.4 This test method is intended for use with linear photovoltaic devices.
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-May-2010
• ICS: 27.160 - Solar energy engineering
• Technical Committee: E44 - Solar, Geothermal and Other Alternative Energy Sources
• Drafting Committee: E44.09 - Photovoltaic Electric Power Conversion

Relations

• Replaces: ASTM E973-05a - Standard Test Method for Determination of the Spectral Mismatch Parameter Between a Photovoltaic Device and a Photovoltaic Reference Cell
• Effective Date: 01-Jun-2010
• Replaced By: ASTM E973-10(2015) - Standard Test Method for Determination of the Spectral Mismatch Parameter Between a Photovoltaic Device and a Photovoltaic Reference Cell
• Effective Date: 01-Mar-2015
• Referred By: ASTM G214-23 - Standard Test Method for Integration of Digital Spectral Data for Weathering and Durability Applications
• Effective Date: 01-Jun-2010
• Referred By: ASTM G113-22 - Standard Terminology Relating to Natural and Artificial Weathering Tests of Nonmetallic Materials
• Effective Date: 01-Jun-2010
• Referred By: ASTM E2236-10(2019) - Standard Test Methods for Measurement of Electrical Performance and Spectral Response of Nonconcentrator Multijunction Photovoltaic Cells and Modules
• Effective Date: 01-Jun-2010
• Referred By: ASTM E2848-13(2023) - Standard Test Method for Reporting Photovoltaic Non-Concentrator System Performance
• Effective Date: 01-Jun-2010
• Referred By: ASTM E1021-15(2019) - Standard Test Method for Spectral Responsivity Measurements of Photovoltaic Devices
• Effective Date: 01-Jun-2010
• Referred By: ASTM E927-19 - Standard Classification for Solar Simulators for Electrical Performance Testing of Photovoltaic Devices
• Effective Date: 01-Jun-2010
• Referred By: ASTM E1362-15(2019) - Standard Test Methods for Calibration of Non-Concentrator Photovoltaic Non-Primary Reference Cells
• Effective Date: 01-Jun-2010
• Referred By: ASTM E1036-15(2019) - Standard Test Methods for Electrical Performance of Nonconcentrator Terrestrial Photovoltaic Modules and Arrays Using Reference Cells
• Effective Date: 01-Jun-2010
• Referred By: ASTM E948-16(2020) - Standard Test Method for Electrical Performance of Photovoltaic Cells Using Reference Cells Under Simulated Sunlight
• Effective Date: 01-Jun-2010
• Referred By: ASTM E1125-16(2020) - Standard Test Method for Calibration of Primary Non-Concentrator Terrestrial Photovoltaic Reference Cells Using a Tabular Spectrum
• Effective Date: 01-Jun-2010
• Referred By: ASTM G130-12(2020) - Standard Test Method for Calibration of Narrow- and Broad-Band Ultraviolet Radiometers Using a Spectroradiometer
• Effective Date: 01-Jun-2010

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: E973 − 10
StandardTest Method for
Determination of the Spectral Mismatch Parameter Between
1
a Photovoltaic Device and a Photovoltaic Reference Cell
This standard is issued under the fixed designation E973; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope taic Cells Using Reference Cells Under Simulated Sun-
light
1.1 This test method covers a procedure for the determina-
E1021TestMethodforSpectralResponsivityMeasurements
tion of a spectral mismatch parameter used in performance
of Photovoltaic Devices
testing of photovoltaic devices.
E1036Test Methods for Electrical Performance of Noncon-
1.2 The spectral mismatch parameter is a measure of the
centrator Terrestrial Photovoltaic Modules and Arrays
error,introducedinthetestingofaphotovoltaicdevice,caused
Using Reference Cells
by mismatch between the spectral responses of the photovol-
E1039 Test Method for Calibration of Silicon Non-
taic device and the photovoltaic reference cell, as well as
ConcentratorPhotovoltaicPrimaryReferenceCellsUnder
3
mismatch between the test light source and the reference
Global Irradiation (Withdrawn 2004)
spectral irradiance distribution to which the photovoltaic ref-
E1125 Test Method for Calibration of Primary Non-
erence cell was calibrated. Examples of reference spectral
ConcentratorTerrestrial Photovoltaic Reference Cells Us-
irradiance distributions are Tables E490 or G173.
ing a Tabular Spectrum
E1328Terminology Relating to Photovoltaic Solar Energy
1.3 The spectral mismatch parameter can be used to correct
3
photovoltaic performance data for spectral mismatch error. Conversion (Withdrawn 2012)
E1362Test Method for Calibration of Non-Concentrator
1.4 This test method is intended for use with linear photo-
Photovoltaic Secondary Reference Cells
voltaic devices.
G138Test Method for Calibration of a Spectroradiometer
1.5 The values stated in SI units are to be regarded as
Using a Standard Source of Irradiance
standard. No other units of measurement are included in this
G173TablesforReferenceSolarSpectralIrradiances:Direct
standard.
Normal and Hemispherical on 37° Tilted Surface
1.6 This standard does not purport to address all of the SI10Standard for Use of the International System of Units
safety concerns, if any, associated with its use. It is the (SI): The Modern Metric System
responsibility of the user of this standard to establish appro-
3. Terminology
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
3.1 Definitions—Definitions of terms used in this test
method may be found in Terminology E772 and Terminology
2. Referenced Documents
E1328.
2
2.1 ASTM Standards: 3.2 Definitions of Terms Specific to This Standard:
3.2.1 test light source, n—a source of illumination whose
E490Standard Solar Constant and Zero Air Mass Solar
Spectral Irradiance Tables spectral irradiance will be used for the spectral mismatch
calculation.
E772Terminology of Solar Energy Conversion
E948Test Method for Electrical Performance of Photovol-
3.3 Symbols—The following symbols and units are used in
this test method:
M—spectral mismatch parameter,
1
This test method is under the jurisdiction of ASTM Committee E44 on Solar,
´—measurement error in short-circuit current,
GeothermalandOtherAlternativeEnergySourcesandisthedirectresponsibilityof
Subcommittee E44.09 on Photovoltaic Electric Power Conversion.
λ—wavelength, µm or nm,
−1
CurrenteditionapprovedJune1,2010.PublishedJuly2010.Originallyapproved
R (λ)—spectral response of reference cell, AW ,
r
in 1983. Last previous edition approved in 2005 as E973–05a. DOI: 10.1520/
−1
R(λ)—spectral response of photovoltaic device, AW ,
t
E0973-10.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E973 − 10
−2
E—irradiance, Wm , 6.1.1.3 The wavelength range shall be wide enough to
−2 −1 −2 −1
E (λ)—spectral irradiance, Wm µm or Wm nm , includethespectralresponseofthephotovoltaicdeviceandthe
and photovoltaic reference cell.
−2 −1
E (λ)—reference spectral irradiance, Wm µm or 6.1.1.4 The spectral irradiance measurement instrument
o
−2 −1
Wm nm . must be able to scan the required wave
...

This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:E973–05a Designation:E973–10
Standard Test Method for
Determination of the Spectral Mismatch Parameter Between
1
a Photovoltaic Device and a Photovoltaic Reference Cell
This standard is issued under the fixed designation E973; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers a procedure for the determination of a spectral mismatch parameter used in performance testing of
photovoltaic devices.
1.2 The spectral mismatch parameter is a measure of the error, introduced in the testing of a photovoltaic device, caused by
mismatch between the spectral responses of the photovoltaic device and the photovoltaic reference cell, as well as mismatch
between the test light source and the reference spectral irradiance distribution to which the photovoltaic reference cell was
calibrated. Examples of reference spectral irradiance distributions are Tables E490 or G173.
1.3 The spectral mismatch parameter can be used to correct photovoltaic performance data for spectral mismatch error.
1.4 This test method is intended for use with linear photovoltaic devices.
1.5
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
E490 Standard Solar Constant and Zero Air Mass Solar Spectral Irradiance Tables
E772 Terminology Relating to Solar Energy Conversion
E948 Test Method for Electrical Performance of Photovoltaic Cells Using Reference Cells Under Simulated Sunlight
E1021 Test Method for Spectral Responsivity Measurements of Photovoltaic Devices
E1036 Test Methods for Electrical Performance of Nonconcentrator Terrestrial Photovoltaic Modules and Arrays Using
Reference Cells
E1039 TestMethodforCalibrationofSiliconNon-ConcentratorPhotovoltaicPrimaryReferenceCellsUnderGlobalIrradiation
E1125 Test Method for Calibration of Primary Non-Concentrator Terrestrial Photovoltaic Reference Cells Using a Tabular
Spectrum
E1328 Terminology Relating to Photovoltaic Solar Energy Conversion
E1362 Test Method for Calibration of Non-Concentrator Photovoltaic Secondary Reference Cells
G138 Test Method for Calibration of a Spectroradiometer Using a Standard Source of Irradiance
G173 Tables for Reference Solar Spectral Irradiances: Direct Normal and Hemispherical on 37 Tilted Surface
SI10 Standard for Use of the International System of Units (SI): The Modern Metric System
3. Terminology
3.1 Definitions—Definitions of terms used in this test method may be found in Terminology E772 and Terminology E1328.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 test light source, n—asourceofilluminationwhosespectralirradiancewillbeusedforthespectralmismatchcalculation.
3.3 Symbols—The following symbols and units are used in this test method:
M—spectral mismatch parameter,
1
This test method is under the jurisdiction of ASTM Committee E44 on Solar, Geothermal, and Other Alternative Energy Sources and is the direct responsibility of
Subcommittee E44.09 on Photovoltaic Electric Power Conversion.
Current edition approved SeptemberJune 1, 2005.2010. Published October 2005.July 2010. Originally approved in 1983. Last previous edition approved in 2005 as
E973–05a. DOI: 10.1520/E0973-05A.10.1520/E0973-10.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,[e-mail] Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
E973–10
´—measurement error in short-circuit current,
l—wavelength, µm or nm,
−1
R (l)—spectral response of reference cell, AW ,
r
−1
R(l)—spectral response of photovoltaic device, AW ,
t
−2
E—irradiance, Wm ,
−2 −1 −2 −1
E (l)—spectral irradiance, Wm µm or Wm nm , and
−2 −1 −2 −1
E (l)—reference spectral irradiance, Wm µm or Wm nm .
o
NOTE 1—Follo
...