ASTM E973-05

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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An American National Standard
Designation:E973–05
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 using Reference Cells
E 1039 Test Method for Calibration of Silicon Non-
1.1 This test method covers a procedure for the determina-
Concentrator Photovoltaic Primary Reference Cells Under
tion of a spectral mismatch parameter used in performance
Global Irradiation
testing of photovoltaic devices.
E1125 Test Method for Calibration of Primary Non-
1.2 The spectral mismatch parameter is a measure of the
Concentrator Terrestrial Photovoltaic Reference Cells Us-
error,introducedinthetestingofaphotovoltaicdevice,caused
ing a Tabular Spectrum
by mismatch between the spectral responses of the photovol-
E1328 Terminology Relating to Photovoltaic Solar Energy
taic device and the photovoltaic reference cell, as well as
Conversion
mismatch between the test light source and the reference
E1362 Test Method for Calibration of Non-Concentrator
spectral irradiance distribution to which the photovoltaic ref-
Photovoltaic Secondary Reference Cells
erence cell was calibrated. Examples of reference spectral
G138 Test Method for Calibration of a Spectroradiometer
irradiance distributions are Tables E490 or G159.
Using a Standard Source of Irradiance
1.3 The spectral mismatch parameter can be used to correct
G159 TablesforReferencesSolarSpectralIrradianceatAir
photovoltaic performance data for spectral mismatch error.
Mass 1.5: Direct Normal and Hemispherical for a 37°
1.4 This test method is intended for use with linear photo-
Tilted Surface
voltaic devices.
G173 Tables for Reference Solar Spectral Irradiances:
1.5 This standard does not purport to address all of the
Direct Normal and Hemispherical on 37° Tilted Surface
safety concerns, if any, associated with its use. It is the
SI10 Standard for Use of the International System of Units
responsibility of the user of this standard to establish appro-
(SI): The Modern Metric System
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
3. Terminology
2. Referenced Documents 3.1 Definitions—Definitions of terms used in this test
2 method may be found in Terminology E772 and Terminology
2.1 ASTM Standards:
E1328.
E490 Solar Constant and Air Mass Zero Solar Spectral
3.2 Definitions of Terms Specific to This Standard:
Irradiance Tables
3.2.1 test light source, n—a source of illumination whose
E772 Terminology Relating to Solar Energy Conversion
spectral irradiance will be used for the spectral mismatch
E948 Test Method for Electrical Performance of Photovol-
calculation.
taicCellsUsingReferenceCellsUnderSimulatedSunlight
3.3 Symbols—The following symbols and units are used in
E1021 Test Methods for Measuring Spectral Response of
this test method:
Photovoltaic Cells
M—spectral mismatch parameter,
E1036 Test Methods for Electrical Performance of Non-
e—measurement error in short-circuit current,
Concentrator Terrestrial Photovoltaic Modules and Arrays
l—wavelength, µm or nm,
−1
R (l)—spectral response of reference cell, AW ,
r
−1
1
This test method is under the jurisdiction of ASTM Committee E44 on Solar, R(l)—spectral response of photovoltaic device, AW ,
t
−2
Geothermal,andOtherAlternativeEnergySourcesandisthedirectresponsibilityof
E—irradiance, Wm ,
Subcommittee E44.09 on Photovoltaic Electric Power Conversion.
−2 −1 −2 −1
E (l)—spectral irradiance, Wm µm or Wm nm ,
Current edition approved April 1, 2005. Published May 2005. Originally
and
approved in 1983. Last previous edition approved in 2002 as E973–02.
2 −2 −1
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
E (l)—reference spectral irradiance, Wm µm or
o
−2 −1
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Wm nm .
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.
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E973–05
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
...