EN 60904-4:2009

SLOVENSKI STANDARD
01-februar-2010
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Photovoltaic devices -- Part 4: Procedure for establishing the traceability of the
calibration of reference solar devices
Photovoltaische Einrichtungen - Teil 4: Referenz-Solarelemente - Verfahren zur
Feststellung der Rückverfolgbarkeit der Kalibrierung
Dispositifs photovoltaïques -- Partie 4: Procédures pour établir la traçabilité de
l'étalonnage des dispositifs solaires de référence
Ta slovenski standard je istoveten z: EN 60904-4:2009
ICS:
27.160 6RQþQDHQHUJLMD Solar energy engineering
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 60904-4
NORME EUROPÉENNE
November 2009
EUROPÄISCHE NORM
ICS 27.160
English version
Photovoltaic devices -
Part 4: Reference solar devices -
Procedures for establishing calibration traceability
(IEC 60904-4:2009)
Dispositifs photovoltaïques -  Photovoltaische Einrichtungen -
Partie 4: Dispositifs solaires de référence - Teil 4: Referenz-Solarelemente -
Procédures pour établir Verfahren zur Feststellung
la traçabilité de l'étalonnage der Rückverfolgbarkeit der Kalibrierung
(CEI 60904-4:2009) (IEC 60904-4:2009)

This European Standard was approved by CENELEC on 2009-09-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: Avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60904-4:2009 E
Foreword
The text of document 82/533/CDV, future edition 1 of IEC 60904-4, prepared by IEC TC 82, Solar
photovoltaic energy systems, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 60904-4 on 2009-09-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2010-06-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2012-09-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60904-4:2009 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60891 NOTE  Harmonized as EN 60891:1994 (not modified).
IEC 60904-1 NOTE  Harmonized as EN 60904-1:2006 (not modified).
IEC 60904-3 NOTE  Harmonized as EN 60904-3:2008 (not modified).
IEC 60904-7 NOTE  Harmonized as EN 60904-7:2009 (not modified).
IEC 60904-8 NOTE  Harmonized as EN 60904-8:1998 (not modified).
IEC 60904-9 NOTE  Harmonized as EN 60904-9:2007 (not modified).
IEC 61836 NOTE  Harmonized as CLC/TS 61836:2009 (not modified).
__________
- 3 - EN 60904-4:2009
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

1) 2)
IEC 60904-2 - Photovoltaic devices - EN 60904-2 2007
Part 2: Requirements for reference solar
devices
1) 2)
ISO/IEC 17025 - General requirements for the competence of EN ISO/IEC 17025 2005
testing and calibration laboratories

ISO/IEC Guide 98-3 2008 Uncertainty of measurement - - -
Part 3: Guide to the expression of uncertainty
in measurement (GUM:1995)
1)
ISO 9059 - Solar energy - Calibration of field - -
pyrheliometers by comparison to a reference
pyrheliometer
1)
ISO 9846 - Solar energy - Calibration of a pyranometer - -
using a pyrheliometer
1)
Undated reference.
2)
Valid edition at date of issue.

IEC 60904-4 ®
Edition 1.0 2009-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Photovoltaic devices –
Part 4: Reference solar devices – Procedures for establishing calibration
traceability
Dispositifs photovoltaïques –
Partie 4: Dispositifs solaires de référence – Procédures pour établir la traçabilité
de l'étalonnage
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
T
CODE PRIX
ICS 27.160 ISBN 2-8318-1044-6
– 2 – 60904-4 © IEC:2009
CONTENTS
FOREWORD.3
1 Scope and object.5
2 Normative references .5
3 Terms and definitions .5
4 Requirements for traceable calibration procedures of PV reference solar devices .7
5 Uncertainty analysis .8
6 Calibration report.8
7 Marking .8
Annex A (informative) Examples of validated calibration procedures.10
Bibliography.24

Figure 1 – Schematic of most common reference instruments and transfer methods
used in the traceability chains for solar irradiance detectors. .7
Figure A.1 – Block diagram of differential spectral responsivity calibration
superimposing chopped monochromatic radiation DE(l) and DC bias radiation E .18
b
Figure A.2 – Optical arrangement of differential spectral responsivity calibration. .19
Figure A.3 – Schematic apparatus of the solar simulator method. .21

Table 1 – Examples of reference instruments, used in a traceability chain of time and
solar irradiance.7
Table A.1 – Typical uncertainty components (k = 2) of global sunlight method .15
Table A.2 – Typical uncertainty components (k = 2) of a differential spectral
responsivity calibration .18
Table A.3 – Example of uncertainty components (k = 2) of a solar simulator method
calibration.21
Table A.4 – Typical uncertainty components (k = 2) of a solar simulator method
calibration when WRR traceable cavity radiometer is used .21
Table A.5 – Typical uncertainty components (k = 2) of a direct sunlight method .23

60904-4 © IEC:2009 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PHOTOVOLTAIC DEVICES –
Part 4: Reference solar devices –
Procedures for establishing calibration traceability

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60904-4 has been prepared by IEC technical committee 82: Solar
photovoltaic energy systems.
The text of this standard is based on the following documents:
CDV Report on voting
82/533/CDV 82/561/RVC
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of IEC 60904 series, under the general title Photovoltaic devices, can be
found on the IEC website.
– 4 – 60904-4 © IEC:2009
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
60904-4 © IEC:2009 – 5 –
PHOTOVOLTAIC DEVICES –
Part 4: Reference solar devices –
Procedures for establishing calibration traceability

1 Scope and object
This part of IEC 60904 sets the requirements for calibration procedures intended to establish
the traceability of photovoltaic reference solar devices to SI units as required by IEC 60904-2.
This standard applies to photovoltaic (PV) reference solar devices that are used to measure
the irradiance of natural or simulated sunlight for the purpose of quantifying the performance
of PV devices. The use of a PV reference solar device is required in the application of
IEC 60904-1 and IEC 60904-3.
This standard has been written with single junction PV reference solar devices in mind, in
particular crystalline Silicon. However, th
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