IEC 61300-2-27:2024

IEC 61300-2-27 ®
Edition 2.0 2024-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures –
Part 2-27: Tests – Dust (laminar flow)
Dispositifs d'interconnexion et composants passifs fibroniques – Procédures
fondamentales d'essais et de mesures –
Partie 2-27: Essais – Poussière (écoulement laminaire)
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IEC 61300-2-27 ®
Edition 2.0 2024-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures –
Part 2-27: Tests – Dust (laminar flow)
Dispositifs d'interconnexion et composants passifs fibroniques – Procédures
fondamentales d'essais et de mesures –
Partie 2-27: Essais – Poussière (écoulement laminaire)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.20 ISBN 978-2-8322-8829-0
– 2 – IEC 61300-2-27:2024  IEC 2024
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 General description . 6
5 Apparatus . 6
5.1 Test chamber . 6
5.2 Dust . 6
5.3 Optical measurement equipment . 6
6 Procedure . 6
6.1 Preparation of DUT . 6
6.2 Preconditioning . 7
6.3 Mounting of DUT . 7
6.4 Measure of initial optical properties . 8
6.5 Monitoring of optical properties . 8
6.6 Initial dust exposure . 8
6.7 Thermal conditioning . 8
6.8 Dust exposure . 8
6.9 Recovery . 8
6.10 Final measurements and examinations . 9
7 Severity . 9
8 Details to be specified and reported. 9
Bibliography . 10

Figure 1 – Possible test configurations . 7

Table 1 – Test severities . 9

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –

Part 2-27: Tests – Dust (laminar flow)

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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Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
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6) All users should ensure that they have the latest edition of this publication.
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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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 61300-2-27 has been prepared by subcommittee 86B: Fibre optic interconnecting devices
and passive components, of IEC technical committee 86: Fibre optics. It is an International
Standard.
This second edition cancels and replaces the first edition published in 1995. This edition
constitutes a technical revision.

– 4 – IEC 61300-2-27:2024  IEC 2024
This edition includes the following significant technical changes with respect to the previous
edition:
a) normative references have been added;
b) the relative humidity requirement during the test has been modified;
c) the procedure description has been modified;
d) Figure 1 showing possible test configurations has been added;
e) the severity of the test has been updated according to the component and performance
category;
f) Clause 8 has been added, listing details to be specified and reported.
The text of this standard is based on the following documents:
Draft Report on voting
86B/4875/FDIS 86B/4910/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/publications.
A list of all parts of IEC 61300 series, published under the general title Fibre optic
interconnecting devices and passive components – Basic test and measurement procedures,
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, or
• revised.
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –

Part 2-27: Tests – Dust (laminar flow)

1 Scope
The purpose of this part of IEC 61300 is to determine the effects of dust on fibre optic
interconnecting devices or passive components.
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 61300-1, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 1: General and guidance
IEC 61300-3-1, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-1: Examinations and measurements – Visual examination
IEC 61300-3-3, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-3: Examinations and measurements – Active monitoring of
changes in attenuation and return loss
IEC 61300-3-4, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-4: Examinations and measurements – Attenuation
IEC 61300-3-6, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-6: Examinations and measurements – Return loss
IEC 61300-3-35, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-35: Examinations and measurements – Visual inspection of
fibre optic connectors and fibre-stub transceivers
IEC 61753 (all parts), Fibre optic interconnecting devices and passive components –
Performance standard
IEC 62005 (all parts), Fibre optic interconnecting devices and passive components – Reliability
IEC TR 62627-01, Fibre optic interconnecting devices and passive components – Part 01: Fibre
optic connector cleaning methods
IEC TR 62572-4, Fibre optic active components and devices – Reliability standards – Part 4:
Guidelines for optical connector end-face cleaning methods for receptacle style optical
transceivers
– 6 – IEC 61300-2-27:2024  IEC 2024
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
4 General description
The device under test (DUT) is exposed to a specified dust concentration within a conditioning
chamber in which the air is circulated for a period of time. The effects of dust exposure on
optical performance and physical integrity of the DUT shall be determined.
5 Apparatus
5.1 Test chamber
The test chamber shall be capable of controlling the dust concentration, velocity, temperature,
and humidity of the dust-laden air. It shall be capable of being raised to and maintained at a
temperature of 63 °C ± 2 °C with a relative humidity not exceeding 25 %. In order to provide
adequative circulation of the dust-laden air, no more than 50 % of the cross-sectional area
(normal to the air flow) and no more than 30 % of the volume of the chamber shall be occupied
by the DUT. The dust-laden air shall be introduced into the chamber in such a manner as to
allow it to become approximately laminar in the flow before striking DUT.
5.2 Dust
The dust shall be capable of passing through a sieve of 150 μm aperture. Dust type shall be
talc powder, unless otherwise specified in the relevant IEC 61753 series performance standard
or IEC 62005 series reliability document.
5.3 Optical measurement equipment
For optical performance measurement, the equipment and measurement methods shall be
according to IEC 61300-3-4 for attenuation and IEC 61300-3-6 for return loss. For changes in
attenuation and return loss, the equipment and measurement method shall be done according
to IEC 61300-3-3. The optical performance measurement shall be performed at the
wavelength(s) specified in the relevant IEC 61753 series performance standard or IEC 62005
series reliability document.
6 Procedure
6.1 Preparation of DUT
Visually examine DUT according to IEC 61300-3-1. Clean the mechanical and optical alignment
parts of the DUT according to IEC TR 62627-01 and IEC TR 62572-4 and afterwards, inspect
the optical parts by means of IEC 61300-3-35. If test Configuration A is used, the DUT shall be
terminated onto a sufficient length of fibre cables. The loose ends of the cables may be
terminated with an interconnecting device to facilitate interfacing with the optical measurement
equipment.
6.2 Preconditioning
Precondition the DUT for a minimum of 2 h at the standard atmospheric conditions specified in
IEC 61300-1.
6.3 Mounting of DUT
The DUT shall be mounted and positioned as near to the centre of the test chamber as
practicable. If more than one DUT is being tested, there shall be a minimum clearance of
100 mm between surfaces of the DUTs and any other object or material which would provide
protection. No surface of the DUT shall be any closer than 100 mm to any wall of the test
chamber. The DUT shall be orientated to expose the most critical or vulnerable parts to the dust
stream. Changes in DUT orientation during the test shall be specified in the relevant IEC 61753
series performance standard or IEC 62005 series reliability document.
Two possible test configurations for optical measurements are: Configuration A depicted in
Figure 1 a) with loose ends of the termination cables located outside the test chamber, and
Configuration B depicted in Figure 1 b) with entire termination cables put inside the chamber.
When termination cables have interconnecting devices on the loose ends, they shall be dust-
protected and positioned so not to disturb laminar dust-laden air flow. Configuration A shall be
used for monitoring the optical performance during the test. For optical measurements before
or after the test, either Configuration A or Configuration B may be used, whichever is more
practicable.
a) Configuration A b) Configuration B

Key
1 test chamber
2 DUT
3 laminar dust-laden air stream
4 dust feeder
5 termination fibre cable(s)
6 dust-protected interconnecting device(s)
Figure 1 – Possible test configurations

– 8 – IEC 61300-2-27:2024  IEC 2024
6.4 Measure of initial optical properties
Measure the optical properties specified in the relevant IEC 61753 series performance standard
or IEC 62005 series reliability document, such as attenuation and return loss. These values
shall be recorded and used as a reference for the test evaluation.
For test Configuration B, initial optical properties shall be recorded before mounting DUT inside
the test chamber.
6.5 Monitoring of optical properties
By default, monitoring of the optical performance during the test is not required. If monitoring
of optical performance during the test is required by the relevant IEC 61753 series performance
standard or IEC 62005 series reliability document, then the change in optical properties, such
as attenuation and return loss of the DUT, shall be monitored during the initial dust exposure
and dust exposure periods, as described in IEC 61300-3-3. The optical properties shall be
measured at the interval specified in the relevant IEC 61753 series performance standard or
IEC 62005 series reliability document.
6.6 Initial dust exposure
Set the chamber controls to maintain an internal chamber temperature of 23 °C ± 2 °C and a
relative humidity of less than 25 %. Adjust the air velocity to 530 m/min ± 70 m/min. Adjust the
dust feeder to control the dust concentration to the specified severity. Maintain these chamber
conditions for the specified duration (refer to Table 1).
6.7 Thermal conditioning
Upon completion of the initial dust exposure period, stop the dust feed and reduce the air
velocity to 90 m/min ± 50 m/min. Raise the internal chamber temperature to 63 °C ± 2 °C. The
rate of change of temperature shall be 2 °C/min ± 1 °C/min. Maintain a relative humidity of less
than 10 %.
6.8 Dust exposure
Upon completion of the thermal conditioning period, maintain the temperature at 63 °C ± 2 °C.
Increase the air velocity to 530 m/min ± 70 m/min. Adjust the dust feeder to control the dust
concentration to the specified severity. Maintain a relative humidity of less than 10 %. Maintain
these chamber conditions for the specified duration (refer to Table 1).
6.9 Recovery
Upon completion of the test, turn off all chamber controls and allow the DUT to return to
standard atmospheric conditions.
For Configuration A, proceed with final measurements as described in 6.10 and then continue
with the rest of recovery procedures.
For Configuration B, proceed with the rest of recovery procedures.
Remove the DUT from the chamber. Remove accumulated dust from the DUT by brushing,
wiping, or shaking, ensuring no additional dust is introduced into the DUT. Dust shall not be
removed by either air blast or vacuum cleaning. DUT shall be kept for a minimum of 2 h at
standard atmospheric conditions before proceeding with final measurements and examinations.
Standard cleaning procedures of termination cables attached interconnecting devices may be
used prior reconnecting with optical measurement equipment.

6.10 Final measurements and examinations
Measure final attenuation and return loss to ensure that there is no permanent optical
degradation on the DUT. The results of the final measurements and the change in optical
properties, compared with initial measurements at 6.4 shall be within the limits established in
the relevant IEC 61753 series performance standard or IEC 62005 series reliability document.
Visually examine DUT in accordance with IEC 61300-3-1. Check for evidence of any
degradation. Examples of failures are as follows:
– broken or damaged seals, protective elements or other parts;
– contamination or scratches on fibre-to-fibre interface surfaces, nonconforming with
IEC 61300-3-35.
7 Severity
The severity consists of the dust concentration and duration of exposure. Table 1 shows the
specified test severities in relation to the performance categories. It is recommended to verify
the test severities with the relevant IEC 61753 series performance standards and IEC 62005
series reliability documents for the normative values.
Table 1 – Test severities
Performance Component Dust Duration of Dust type
category concentration ex
...