ASTM E973-02

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:E973–02
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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope E1036 Test Methods for Electrical Performance of Non-
Concentrator Terrestrial Photovoltaic Modules and Arrays
1.1 This test method covers a procedure for the determina-
3
using Reference Cells
tion of a spectral mismatch parameter used in performance
E 1039 Test Method for Calibration of Silicon Non-
testing of photovoltaic devices.
Concentrator Photovoltaic Primary Reference Cells Under
1.2 The spectral mismatch parameter is a measure of the
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Global Irradiation
error,introducedinthetestingofaphotovoltaicdevice,caused
E1125 Test Method for Calibration of Primary Non-
by mismatch between the spectral responses of the photovol-
Concentrator Terrestrial Photovoltaic Reference Cells Us-
taic device and the photovoltaic reference cell, as well as
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ing a Tabular Spectrum
mismatch between the test light source and the reference
E1328 Terminology Relating to Photovoltaic Solar Energy
spectral irradiance distribution to which the photovoltaic ref-
3
Conversion
erence cell was calibrated. Examples of reference spectral
E1362 Test Method for Calibration of Non-Concentrator
irradiance distributions are Tables E490 or G159.
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Photovoltaic Secondary Reference Cells
1.3 The spectral mismatch parameter can be used to correct
G138 Test Method for Calibration of a Spectroradiometer
photovoltaic performance data for spectral mismatch error.
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Using a Standard Source of Irradiance
1.4 This test method is intended for use with linear photo-
G159 TablesforReferencesSolarSpectralIrradianceatAir
voltaic devices.
Mass 1.5: Direct Normal and Hemispherical for a 37°
1.5 There is no similar or equivalent ISO Standard.
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Tilted Surface
1.6 This standard does not purport to address all of the
SI10 Standard for Use of the International System of Units
safety concerns, if any, associated with its use. It is the
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(SI): The Modern Metric System
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
3. Terminology
bility of regulatory limitations prior to use.
3.1 Definitions—Definitions of terms used in this test
1.7 The values stated in SI units are to be regarded as the
method may be found in Terminology E772 and Terminology
standard.
E1328.
2. Referenced Documents 3.2 Definitions of Terms Specific to This Standard:
3.2.1 test light source, n—a source of illumination whose
2.1 ASTM Standards:
spectral irradiance will be used for the spectral mismatch
E490 Solar Constant and Air Mass Zero Solar Spectral
2
calculation.
Irradiance Tables
3 3.3 Symbols—The following symbols and units are used in
E772 Terminology Relating to Solar Energy Conversion
this test method:
E948 Test Method for Electrical Performance of Photovol-
M—spectral mismatch parameter,
taic Cells Using Reference Cells Under Simulated Sun-
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e—measurement error in short-circuit current,
light
l—wavelength, µm or nm,
E1021 Test Methods for Measuring Spectral Response of
−1
3
R (l)—spectral response of reference cell, AW ,
r
Photovoltaic Cells
−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 ,
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This test method is under the jurisdiction of ASTM Committee E44 on Solar,
and
−2 −1
Geothermal,andOtherAlternativeEnergySourcesandisthedirectresponsibilityof
E (l)—reference spectral irradiance, Wm µm or
o
Subcommittee E44.09 on Photovoltaic Electric Power Conversion.
−2 −1
Wm nm .
Current edition approved Oct. 10, 2002. Published October 2002. Originally
published as E973–83. Last previous edition E973–96.
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Annual Book of ASTM Standards, Vol 15.03.
3 4
Annual Book of ASTM Standards, Vol 12.02. Annual Book of ASTM Standards, Vol 14.04.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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E973–02
NOTE 1—Following normal SI rules for compound units (see Practice
7. Procedure
SI10), the units for spectral irradiance, the derivative of irradiance with
7.1 Determine the spectral response R(l) of the photovol-
−3
t
respect to wavelength dE/d (l), would be Wm . However, to avoid
taic device using Test Methods E1021.
possible confusion with a volumetric power density unit and for conve-
7.2 Obtain the spectral response R (l) of the photovoltaic
...