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ASTM E973-05a

Historical Revision

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

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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 E 490 or G 159.

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 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.


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.

5.2.1 The spectral mismatch parameter is formulated as the fractional error in the short-circuit current due to spectral differences.3 ,4

5.2.2 Error due to spectral mismatch can be corrected by dividing the measured photovoltaic cell current by M, a procedure used in Test Methods E 948 and E 1036

SDO ASTM: ASTM International
Document Number E973
Publication Date Sept. 1, 2005
Language en - English
Page Count 3
Revision Level 05a
Supercedes
Committee E44.09
Publish Date Document Id Type View
July 1, 2016 E0973-16 Revision
Dec. 1, 2015 E0973-15 Revision
June 1, 2010 E0973-10 Revision
Sept. 1, 2005 E0973-05A Revision
April 1, 2005 E0973-05 Revision
Oct. 10, 2002 E0973-02 Revision
Jan. 1, 1991 E0973-91E01 Revision
June 1, 2020 E0973-16R20 Reaffirmation
March 1, 2015 E0973-10R15 Reaffirmation