IEC 60825-12:2022
(Main)Safety of laser products - Part 12: Safety of free space optical communication systems used for transmission of information
Safety of laser products - Part 12: Safety of free space optical communication systems used for transmission of information
IEC 60825-12:2022 This part is applicable to products that emit laser radiation for the purpose of free space optical data transmission. This document does not apply to laser products designed for the purposes of transmitting optical power for applications such as material processing or medical treatment. This document also does not apply to the use of laser products in explosive atmospheres (see IEC 60079-0). Light-emitting diodes employed by free space optical communication systems, used for the purpose of free space optical data transmission, do not fall into the scope of this document. The contents of the corrigendum 1 (2024-07) have been included in this copy.
Sécurité des appareils à laser - Partie 12 : Sécurité des systèmes de communication optiques en espace libre utilisés pour la transmission d'informations
IEC 60825-12:2022 La présente partie s'applique aux appareils qui émettent un rayonnement laser à des fins de transmission optique de données en espace libre. Le présent document ne s'applique pas aux appareils à laser conçus dans le but de transmettre un flux énergétique optique pour des applications telles que le traitement des matériaux ou le traitement médical. Le présent document ne s'applique pas non plus à l'utilisation des appareils à laser en atmosphères explosives (voir l’IEC 60079-0). Les diodes électroluminescentes utilisées par les systèmes de communication optique en espace libre, pour la transmission optique de données en espace libre, ne relèvent pas du domaine d’application du présent document. Le contenu du corrigendum 1 (2024-07) a été pris en considération dans cet exemplaire.
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IEC 60825-12 ®
Edition 3.0 2022-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Safety of laser products –
Part 12: Safety of free space optical communication systems used for
transmission of information
Sécurité des appareils à laser –
Partie 12: Sécurité des systèmes de communication optique en espace libre
utilisés pour la transmission d’informations
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IEC 60825-12 ®
Edition 3.0 2022-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Safety of laser products –
Part 12: Safety of free space optical communication systems used for
transmission of information
Sécurité des appareils à laser –
Partie 12: Sécurité des systèmes de communication optique en espace libre
utilisés pour la transmission d’informations
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.260 ISBN 978-2-8322-6195-8
– 2 – IEC 60825-12:2022 © IEC 2022
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Assessment of access level . 12
4.1 General . 12
4.2 Determination of access level and the use of Condition 2. 13
4.3 Access level 1 and 1M . 14
4.4 Access level 2 and 2M . 15
4.5 Access level 3R . 16
4.6 Access level 3B . 16
4.7 Access level 4 . 16
4.8 Time base . 17
5 Classification and evaluation of access level . 17
5.1 General . 17
5.2 Impact of using automatic power reduction features . 18
5.3 Automatic power reduction mechanisms (APR) . 18
5.3.1 General . 18
5.3.2 APR performance requirements . 18
5.4 Installation protection systems (IPS) . 19
6 Access level and classification requirements by location type . 19
6.1 General . 19
6.2 Requirements for unrestricted locations . 22
6.2.1 General . 22
6.2.2 Use of access level 1M and access level 2M FSOCS equipment in
unrestricted locations. 24
6.2.3 Use of access level 3R FSOCS equipment in unrestricted locations . 26
6.2.4 General . 26
6.2.5 Use of access level 3R FSOCS equipment in restricted locations . 27
6.3 Requirements for controlled locations . 28
6.3.1 General . 28
6.3.2 Use of access level 3B and access level 4 FSOCS equipment in
controlled locations . 29
6.4 Requirements for inaccessible space . 29
6.5 Specular reflections . 29
7 Organizational requirements . 30
7.1 Requirements for manufacturers of ready-to-use FSOCS transmitter or turn
key systems . 30
7.1.1 General . 30
7.1.2 Additional manufacturer's requirements . 31
7.2 Installation and service organization requirements . 32
7.3 Operating organization requirements . 33
8 Marking . 33
8.1 General . 33
8.2 Marking of aperture for transmitter . 35
8.3 Durability – Indelibility requirements for safety markings . 35
8.4 Warning for invisible radiation . 35
Annex A (informative) Rationale . 36
Annex B (informative) Clarification of the meaning of "access level" . 37
B.1 General . 37
B.2 Class . 37
B.3 Access level . 37
Annex C (informative) Examples of applications and calculations. 38
C.1 Symbols used in the example of this annex . 38
C.2 Examples of NHZ and ENHZ . 38
C.2.1 General . 38
C.2.2 Example − Collimated beam access level 1M FSOCS . 38
C.2.3 Example − Diverging beam access level 1M FSOCS . 39
C.2.4 Example – Access level 3B FSOCS product . 39
C.3 Viewing a specular (mirror-like) reflection . 40
C.4 Example of divergent, diffuse IR transmitter . 41
C.5 FSOCS link between two restricted locations . 42
C.6 Unmanned (uncrewed) Aerial (aircraft) system (UAS) . 45
Annex D (informative) Methods of hazard/safety analysis . 48
Annex E (informative) Guidance for installing, servicing and operating organizations . 49
E.1 Working practices for FSOCSs . 49
E.1.1 General . 49
E.1.2 General working practices . 49
E.1.3 Additional working practices for Class/access level 1M, 2M, 3R, 3B and
4 systems . 50
E.2 Education and training . 50
Bibliography . 51
Figure 1 – Commercial structures . 20
Figure 2 – Residential areas . 21
Figure 3 – Examples of external location types . 23
Figure 4 – Access level 1M or 2M transmitter near edge of unrestricted rooftop . 25
Figure 5 – Access level 1M transmitter in unrestricted location . 25
Figure 6 – Access level 3R transmitter in restricted location . 28
Figure C.1 – Link between two widely separated locations . 42
Figure C.2 – Unmanned (uncrewed) Aerial (aircraft) System with FSOCS . 45
Figure C.3 – Grounded FSOCS installed to the ground . 46
Figure C.4 – Grounded FSOCS installed to the controlled location . 46
Table 1 – Measurement aperture diameters and distances for the default (simplified)
evaluation . 14
Table 2 – Restrictions for the use of FSOCS based on access levels . 22
Table 3 – Requirements for warning signs . 32
Table 4 – Marking requirements . 34
Table C.1 − Symbols used in the example of Annex C . 38
Table C.2 – Allowed access levels and installation requirements . 47
– 4 – IEC 60825-12:2022 © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY OF LASER PRODUCTS –
Part 12: Safety of free space optical communication systems
used for transmission of information
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
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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.
IEC 60825-12 has been prepared by IEC technical committee 76: Optical radiation safety and
laser equipment. It is an International Standard.
This third edition cancels and replaces the second edition published in 2019. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition.
a) Where relevant and appropriate, references to IEC 60825-1 have been changed to a specific
dated reference i.e. IEC 60825-1:2014.
b) Condition 2 has been changed from 7 mm aperture stop and 70 mm distance as follows,
– For wavelengths less than 1 400 nm, 3,5 mm aperture stop and 35 mm distance,
– For wavelengths equal to or greater than 1 400 nm, 3,5 mm aperture stop and 14 mm
distance.
c) For wavelengths between 1 200 nm and 1 400 nm, an additional limitation is required equal
to the equivalent radiant power of the skin MPE. C has therefore been revised in
accordance with IEC 60825-1:2014, but with this additional limitation related to the skin
MPE; see 4.2.
d) Additional detail added regarding time base, see 4.8.
e) Additional clarification added to Clause 8 regarding the content and formatting of labels.
f) Annex A has been added, providing a rationale for the differences in approach between this
document and IEC 60825-1:2014.
g) Annex B has been added, providing clarification of the meaning of the term "access level".
h) Worked examples have been added for a variety of scenarios; see Clauses C.2 to C.5.
i) Clause C.6 has been added on UAS, unmanned aerial systems.
The text of this International Standard is based on the following documents:
Draft Report on voting
76/717/FDIS 76/722/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
The list of all parts of the IEC 60825 series, published under the title Safety of laser products,
can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates that it
contains colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this document using a colour printer.
– 6 – IEC 60825-12:2022 © IEC 2022
INTRODUCTION
The objective of this document is to:
– protect people from hazardous optical radiation emitted by FSOCSs;
– provide safety requirements and guidance for the design, manufacture and use of laser
products or laser systems, which emit laser radiation for the purpose of free space optical
data transmission;
– provide guidance for installation, operation, maintenance and service to assure the safe
deployment and use of such laser systems.
This document only addresses the open beam portion of the laser product or laser system.
This document places the responsibility for certain product safety requirements, as well as
requirements for providing appropriate information on how to use these systems safely, on the
manufacturer of the system or the transmitters. It places the responsibility for the safe
deployment and use of these systems on the installer or the operating organization. It places
the responsibility for adherence to safety instructions during installation and service operations
on the installation and service organizations as appropriate, and during operation and
maintenance functions on the operating organization. It is recognized that the user of this
document may fall into one or more of the categories of manufacturer, installer, service
organization and/or operating organization as mentioned above.
Annex A gives a more detailed rationale for this document, and some examples are given in
Annex C.
SAFETY OF LASER PRODUCTS –
Part 12: Safety of free space optical communication systems
used for transmission of information
1 Scope
This part of IEC 60825 is applicable to products that emit laser radiation for the purpose of free
space optical data transmission.
This document does not apply to laser products designed for the purposes of transmitting optical
power for applications such as material processing or medical treatment. This document also
does not apply to the use of laser products in explosive atmospheres (see IEC 60079-0). Light-
emitting diodes employed by free space optical communication systems, used for the purpose
of free space optical data transmission, do not fall into the scope of this document.
NOTE If the laser product incorporates an optical fibre that extends from the confinements by a system or enclosed
space, the requirements in IEC 60825-2 apply.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
IEC 60825-1:2014, Safety of laser products – Part 1: Equipment classification and requirements
IEC 60825-2, Safety of laser products – Part 2: Safety of optical fibre communication systems
(OFCSs)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60825-1:2014 and
the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
access level
potential hazard at any accessible position as a result of the optical emissions from a free space
optical communication system (FSOCS) installation
Note 1 to entry: The access level is based on the level of laser radiation which could become accessible in
reasonably foreseeable circumstances, e.g. walking into an open beam path. It is closely related to the laser
classification procedure in IEC 60825-1. The meaning of access level is clarified in Annex B.
Note 2 to entry: Practically speaking, it takes two or more seconds to fully align an optical aid with a beam (which
might occur in an unrestricted location), and this delay is incorporated into the method for determining access level.
– 8 – IEC 60825-12:2022 © IEC 2022
3.2
access level 1
assigned hazard at any accessible location within a FSOCS at which, under any reasonably
foreseeable event, human access to laser radiation (accessible emission), evaluated by the
measurement conditions for access level 1 as defined in Clause 4 of this document, will not
exceed the accessible emission limits of Class 1 for the applicable wavelengths and emission
duration, with additional constraints as defined in 4.3
Note 1 to entry: The "additional constraints" mentioned above refer to additional and stricter constraints that 4.3 of
this document places on the values specified in IEC 60825-1:2014 for the accessible emission limits of Class 1 in
the wavelength range 1 200 to 1 400 nm.
3.3
access level 1M
assigned hazard at any accessible location within a FSOCS at which, under any reasonably
foreseeable event, human access to laser radiation (accessible emission), evaluated by the
measurement conditions for access level 1M as defined in Clause 4 of this document, will not
exceed the accessible emission limits of Class 1 for the applicable wavelengths and emission,
with additional constraints as defined in 4.3
Note 1 to entry: The "additional constraints" mentioned above refer to additional and stricter constraints that 4.3 of
this document places on the values specified in IEC 60825-1:2014 for the accessible emission limits of Class 1 in
the wavelength range 1 200 to 1 400 nm.
3.4
access level 2
assigned hazard at any accessible location within a FSOCS at which, under any reasonably
foreseeable event, human access to laser radiation (accessible emission), evaluated by the
measurement conditions for access level 2 as defined in Clause 4 of this document, will not
exceed the accessible emission limits of Class 2 for the applicable wavelengths and emission
duration, with additional constraints as defined in 4.4
3.5
access level 2M
assigned hazard at any accessible location within a FSOCS at which, under any reasonably
foreseeable event, human access to laser radiation (accessible emission), evaluated by the
measurement conditions for access level 2M as defined in Clause 4 of this document, will not
exceed the accessible emission limits of Class 2 for the applicable wavelengths and emission
duration, with additional constraint as defined in 4.4
3.6
access level 3R
assigned hazard at any accessible location within a FSOCS at which, under any reasonably
foreseeable event, human access to laser radiation (accessible emission), evaluated by the
measurement conditions for access level 3R as defined in Clause 4 of this document, will not
exceed the accessible emission limits of Class 3R for the applicable wavelengths and emission
duration, with additional constraints as defined in 4.5
Note 1 to entry: The "additional constraints" mentioned above refer to additional and stricter constraints that 4.5 of
this document places on the values specified in IEC 60825-1:2014 for the accessible emission limits of Class 1 in
the wavelength range 1 200 to 1 400 nm.
3.7
access level 3B
assigned hazard at any accessible location within a FSOCS at which, under any reasonably
foreseeable event, human access to laser radiation (accessible emission), evaluated by the
measurement conditions for access level 3B as defined in Clause 4 of this document, will not
exceed the accessible emission limits of Class 3B for the applicable wavelengths and emission
duration, with additional constraints as defined in 4.6
3.8
access level 4
assigned hazard at any accessible location within a FSOCS at which, under any reasonably
foreseeable event, human access to laser radiation (accessible emission), evaluated by the
measurement conditions for access level 4 as defined in Clause 4 of this document, will exceed
the accessible emission limits of Class 3B for the applicable wavelengths and emission
duration, with additional constraints as defined in 4.7
Note 1 to entry: This document is applicable to the conditions of operation and maintenance of FSOCS. In order to
achieve an adequate level of safety for persons who may come into contact with the optical transmission path, access
level 4 is not permitted by this document. It is permitted to use protection systems, such as automatic power reduction
(APR, see 3.10) or installation protection system (IPS: see 3.17), to achieve the required access level where the
transmitted power under any operating conditions (e.g. normal and fault operation) exceeds that permitted for a
particular location type. For instance, it is possible for accessible parts of an FSOCS to be access level 1 even
though the power transmitted down the free space under normal operating conditions is Class 4.
3.9
aperture for transmitter
the window or laser transmissive port of FSOCS through which the beam is emitted into free
space
3.10
automatic power reduction
APR
feature of a transmitter of an FSOCS, provided by the system equipment manufacturer, by which
the accessible power in the nominal hazard zone (NHZ) or extended nominal hazard zone
(ENHZ) is reduced to a specified value within a specified time
Note 1 to entry: The term "automatic power reduction" (APR) used in this document encompasses the following
terms used in the International Telecommunication Union (ITU) Recommendation G.664:
• automatic laser shutdown (ALS);
• automatic power reduction (APR);
• automatic power shutdown (APSD).
3.11
beacon
optical source whose function is to aid in pointing or alignment of an FSOCS transmitter and/or
receiver
3.12
end-to-end system
FSOCS that is comprised of at least one transmitter, one receiver, and any peripheral hardware
necessary for the effective transfer of data along the transmission path from one position in
space to another
3.13
extended nominal hazard zone
ENHZ
volume of space within which, when optical aids are used, the level of eye exposure to direct,
reflected or scattered radiation exceeds the applicable maximum permissible exposure (MPE)
as defined in IEC 60825-1:2014
Note 1 to entry: Exposure levels outside the boundary of the ENHZ are below the applicable MPE when optical aids
are used.
Note 2 to entry: This volume is determined prior to activation of any IPS or APR systems unless the APR is used
for classification under the conditions of Clause 5 of this document.
– 10 – IEC 60825-12:2022 © IEC 2022
3.14
free space optical communication system
FSOCS
installed, portable, or temporarily mounted, through-the-air system typically used, intended or
promoted for voice, data or multimedia communications and/or control purposes via the use of
FSOC transmitter
Note 1 to entry: "Free space" means the volume of air into which the laser radiation is emitted.
Note 2 to entry: Emitting and detecting assemblies are sometimes separated and sometimes not be separated.
3.15
FSOC transmitter
transmitter
optical transmitter emitting radiation through the air and used in an FSOCS
3.16
installation organization
installer
organization or individual who is responsible for the installation of an FSOCS
3.17
installation protection system
IPS
feature of an installation site, provided by the installer or operating organization, that has two
functions: (1) it detects human entry into the accessible volume of either the NHZ for restricted
or controlled locations or the ENHZ for an unrestricted location, and (2) once such entry is
detected, causes reduction of the accessible power of the laser to a specified level within a
specified time
3.18
interlock
means either of preventing access to a hazardous zone until the hazard is removed, or of
automatically removing the hazardous condition when access is gained
Note 1 to entry: Interlocks should be failsafe (see 60825-1:2014 3.39), that is when the interlock is in the failure
mode does not defeat the purpose of the interlock.
3.19
location
position or site occupied or available for occupancy
Note 1 to entry: Other standards may use the same terms for location types (3.20 to 3.23) with somewhat different
definitions.
3.20
location of inaccessible space
inaccessible space
volume where a person cannot normally be located, i.e. the space that has a horizontal spacing
more than 2,5 m from any unrestricted location and is both greater than 6 m above a surface in
any unrestricted location, and more than 3 m above a surface in any restricted location
Note 1 to entry: Inaccessible space may be entered by, for example, aircraft.
Note 2 to entry: All open space that is neither an unrestricted, restricted nor controlled location.
3.21
location with controlled access
controlled location
location where an engineering and administrative control measures are present to make it
inaccessible except to authorized personnel with appropriate laser safety training
3.22
location with restricted access
restricted location
location that is normally inaccessible to the general public (including workers, visitors, and
residents in the immediate vicinity) by means of any administrative or engineering control
measure but that is accessible to authorized personnel (e.g. maintenance or service personnel
including window cleaners in exterior locations) who did not have laser safety training
3.23
location with unrestricted access
unrestricted location
location where access to the transmission/receiver equipment and open beam is not limited
(accessible to the general public)
3.24
manufacturer
organization or individual who makes or assembles optical devices and other components for
the construction or modification of an FSOCS
3.25
nominal hazard zone
NHZ
volume within which the level of eye exposure to direct, reflected or scattered radiation exceeds
the applicable maximum permissible exposure (MPE) as defined in IEC 60825-1:2014
Note 1 to entry: Exposure levels outside the boundary of the NHZ are below the applicable MPE.
Note 2 to entry: This volume is determined prior to activation of any IPS or APR systems unless the APR is used
for classification under the conditions of Clause 5 of this document.
3.26
operating organization
operator
organization or individual who is responsible for the operation and maintenance of an FSOCS
3.27
optically-aided
use of optical aids to view an emitting source from within the emitted beam
Note 1 to entry: It is possible that telescopic optics, including binoculars, could increase the hazard to the eye by
intrabeam viewing of a collimated beam when viewed at a distance.
Note 2 to entry: Optical aids are for example, binoculars or magnifiers.
Note 3 to entry: Prescription eyeglasses and contact lenses are not considered optical aids.
3.28
removable laser system
laser system that can be removed from its protective housing and operated by simply plugging
into electrical mains or connection to a battery
3.29
primary beam
beam that transmits the modulated data signal
3.30
reasonably foreseeable event
event (or condition) that is credible and whose likelihood of occurrence (or existence) cannot
be disregarded
– 12 – IEC 60825-12:2022 © IEC 2022
3.31
service organization
organization or individual who is responsible for the service of an FSOCS
Note 1 to entry: The term service is defined in IEC 60825-1:2014, 3.79.
3.32
special tool
tool that is not readily available at retail consumer hardware stores
Note 1 to entry: Typical tools in this category are intended for use with tamper-resistant fasteners.
3.33
spillover
beam radiant energy that propagates past the receiving terminal
3.34
time base
emission duration to be considered for determination of access level
3.35
without optical aids
optically unaided
without using magnifiers or other optical aids, as with the naked eye
Note 1 to entry: Prescription eyeglasses and contact lenses are not considered optical aids.
4 Assessment of access level
4.1 General
The FSOC transmitter shall comply with the applicable requirement of IEC 60825-1:2014.
If an FSOCS incorporates a removable laser system, that removable laser system shall comply
with the applicable requirements of IEC 60825-1.
FSOCSs have limitations imposed by this document that are dependent on the location type(s)
in which they are installed. Product classification and access level restrictions by location type
are summarized in Table 2.
For each location where emission is transmitted, crosses or is received, respective exposure
conditions shall be individually evaluated. Furthermore, potentially occupied locations along the
beam path, within the NHZ or ENHZ, shall also be evaluated for acceptable access levels
(Table 2) and appropriate controls applied. Locations which could be traversed by reflections,
actual or potential, of the beam shall also be evaluated if the emission could exceed access
level 1 or 2. At a given location, the installation and operational constraints applied from
Clause 6 shall be determined by whichever is the more hazardous: the transmitted or the
received optical radiation.
The correct allocation of access levels is the ultimate responsibility of the operating organization.
However, the access levels may be determined by the maintenance, installation or service
organization; or even by the manufacturer, provided the operating organisation is able to
provide the manufacturer with sufficient information regarding the precise environment in which
the particular FSOCS is to be deployed. The methods for determining compliance with an
access level are the same as those described for classification in IEC 60825-1 except for the
following.
a) The access level within a designated location shall be determined at any position relative to
an FSOCS transmitter where the access level is maximized.
NOTE The maximized access level can be driven by many factors such as windows and transmitter orientation
(in particular for transmitters with dynamic pointing).
b) The access level may depend on the activation of an IPS or APR system.
c) If an IPS or APR system is monitoring the location in question, it shall meet the performance
requirements defined in 5.3.2. Otherwise, the same method used for classification is also
used for determination of access level. For viewing conditions without optical aids refer to
the tables of MPEs in IEC 60825-1.
Verification testing of access levels shall be carried out under reasonably foreseeable fault
conditions to ensure that the APR and/or IPS, if used, is operating properly. In circumstances
where it is difficult to carry out direct measurements, an assessment of the access level based
on calculations is acceptable. Faults which result in the emission of radiation in excess of the
applicable AEL for a limited period only and for which it is not reasonably foreseeable that
human access to the radiation will occur before the product is taken out of service or adjusted
down below the AEL, need not be considered.
4.2 Determination of access level and the use of Condition 2
The access level is determined by the measurement of the optical radiation that could become
accessible following any reasonably foreseeable event during operation and maintenance. The
methods for the determination of compliance with the specified radiation limit values are the
same as those described for classification in IEC 60825-1.
In this document three conditions shall be tested. Condition 1 and Condition 3 shall be tested
according to IEC 60825-1 and the condition 2 measurements to establish access levels shall
be made with,
• for wavelength less than 1 400 nm, 3,5 mm aperture at a distance of 35 mm
• for wavelength equal or greater than 1 400 nm, 3,5 mm aperture at a distance of 14 mm
from the end of the FSOCS transmitter (this simulates a × 18 magnifier), as described in Table 1.
In addition to the above, if the FSOCS transmitter is access level 3B and is handheld, the total
emission at any wavelength shall not exceed the AEL of Class 3B.
In circumstances where it is difficult to carry out direct measurements, an assessment of access
level based on calculations is acceptable.
For an FSOCS with automatic power reduction (see 5.3.2 for APR performance requirements),
the access level will be determined by the accessible emission (pulsed or continuous wave)
after the time interval of 2 s. Additionally the MPE requirement in 5.2 shall be satisfied.
– 14 – IEC 60825-12:2022 © IEC 2022
Table 1 – Measurement aperture diameters and distances
for the default (simplified) evaluation
a
Condition 1 Condition 2 Condition 3
Applied to collimated beam Applied to divergent Applied to determine
where e.g. telescope or beam where e.g. eye irradiation relevant for the
binoculars can increase the loupes or high power optically unaided ey
...
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