IEC 60793-1-60:2017
(Main)Optical fibres - Part 1-60: Measurement methods and test procedures - Beat length
Optical fibres - Part 1-60: Measurement methods and test procedures - Beat length
IEC 60793-1-60:2017 defines test methods for both the phase beat length, and the group beat length. These two parameters are defined differently, and will give different results depending on the type of polarization-maintaining (PM) fibre. The phase beat length is the relevant parameter for the fibres ability to maintain a high extinction ratio. This is described in more details in Annexes A and B.
Fibres optiques - Partie 1-60: Méthodes de mesure et procédures d'essai - Longueur de battement
IEC 60793-1-60:2017 définit des méthodes d’essai tant pour la longueur de battement de phase que pour la longueur de battement de groupe. Ces deux paramètres sont définis de manière différente et produisent des résultats différents selon le type de fibre à maintien de polarisation (PM – polarization-maintaining). La longueur de battement de phase est le paramètre approprié de la capacité des fibres à maintenir un rapport d’extinction élevé. Les Annexes A et B décrivent ces éléments de manière plus détaillée.
Electromagnetic compatibility (EMC) - Part 3: Limits - Section 8: Signalling on low-voltage electrical installations - Emission levels, frequency bands and electromagnetic disturbance levels
General Information
Standards Content (Sample)
SLOVENSKI SIST IEC 61000-3-8:2004
STANDARD
april 2004
Electromagnetic compatibility (EMC) - Part 3: Limits - Section 8: Signalling on low-
voltage electrical installations - Emission levels, frequency bands and
electromagnetic disturbance levels
ICS 33.100.10 Referenčna številka
© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno
NORME
CEI
INTERNATIONALE
IEC
61000-3-8
INTERNATIONAL
Première édition
STANDARD
First edition
1997-08
Compatibilité électromagnétique (CEM) –
Partie 3:
Limites –
Section 8: Transmission de signaux dans
les installations électriques à basse tension –
Niveaux d’émission, bandes de fréquences
et niveaux de perturbations électromagnétiques
Electromagnetic compatibility (EMC) –
Part 3:
Limits –
Section 8: Signalling on low-voltage electrical
installations – Emission levels, frequency bands
and electromagnetic disturbance levels
IEC 1997 Droits de reproduction réservés Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
utilisée sous quelque forme que ce soit et par aucun any form or by any means, electronic or mechanical,
procédé, électronique ou mécanique, y compris la photo- including photocopying and microfilm, without permission in
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Pour prix, voir catalogue en vigueur
For price, see current catalogue
61000-3-8 © IEC:1997 – 3 –
CONTENTS
Page
FOREWORD . 5
INTRODUCTION. 7
Clause
1 Scope. 9
2 Normative references. 9
3 General. 11
4 Definitions. 13
5 Frequency bands (ITU region 1 only). 13
6 Transmitter output signal voltage .13
7 Disturbance and interference limits. 17
8 Test conditions. 21
9 Inadvertent operation. 23
Tables
1 Limits of mains terminal interference voltage in the frequency range 0,15 MHz to 30 MHz . 19
2 Limits of radiated interference field strength in the frequency range 30 MHz
to 1 000 MHz at a test distance of 10 m. 19
3 Limits of disturbance . 21
Figures
1 Measurement of output levels in the band 3 kHz to 9 kHz (differential mode) . 25
2 Measurement of output levels in the band 3 kHz to 9 kHz (common mode) . 27
3 Measurement of spectral bandwidth . 29
4 Measuring arrangement for equipment whose operation is dependent on the
transmitter being in circuit . 31
5 Artificial mains network 3 kHz to 9 kHz . 33
6 Idealized equivalent circuit model – DUT port impedance . 35
Annexes
A Measurement of output signal levels and conducted interference levels
(3 kHz to 30 MHz) . 37
B Basis of the artificial mains network for the measurement of output signals at
frequencies below 9 kHz . 39
61000-3-8 © IEC:1997 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_________
ELECTROMAGNETIC COMPATIBILITY (EMC) –
Part 3: Limits –
Section 8: Signalling on low-voltage electrical installations –
Emission levels, frequency bands and electromagnetic disturbance levels
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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
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for Standardization (ISO) in accordance with conditions determined by agreement between the two
organizations.
2) The formal decisions or agreements of the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical reports or guides and they are accepted by the National Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International standard IEC 61000-3-8 has been prepared by subcommittee 77B: High-frequency
phenomena, of IEC technical committee 77: Electromagnetic compatibility.
The text of this standard is based on the following documents:
FDIS Report on voting
77B/187/FDIS 77B/202/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
Annex A forms an integral part of the standard.
Annex B is for information only.
61000-3-8 © IEC:1997 – 7 –
INTRODUCTION
This standard is part of the IEC 61000 series, according to the following structure:
Part 1: General
General consideration (introduction, fundamental principles)
Definitions, terminology
Part 2: Environment
Description of the environment
Classification of the environment
Compatibility levels
Part 3: Limits
Emission limits
Immunity limits (in so far as they do not fall under the responsibility of the product committees)
Part 4: Testing and measurement techniques
Measurement techniques
Testing techniques
Part 5: Installation and mitigation guidelines
Installation guidelines
Mitigation methods and devices
Part 6: Generic standards
Part 9: Miscellaneous
Each part is further subdivided into sections which are to be published either as international
standards or as technical reports.
This section is an international standard which gives requirements related to emission levels,
frequency bands and electromagnetic disturbance levels for signalling on low-voltage electrical
installations.
61000-3-8 © IEC:1997 – 9 –
ELECTROMAGNETIC COMPATIBILITY (EMC) –
Part 3: Limits –
Section 8: Signalling on low-voltage electrical installations –
Emission levels, frequency bands and electromagnetic disturbance levels
1 Scope
This section of IEC 61000-3 applies to electrical equipment using signals in the frequency
range from 3 kHz up to 525 kHz to transmit information on low-voltage electrical installations,
either on the public supply system or within customers' premises.
It specifies frequency bands allocated to different applications (where appropriate), limits for
the terminal output voltage in the operating band and limits for conducted and radiated
disturbance. It also gives the methods of measurement.
It specifies disturbance limits in the frequency range from 3 kHz up to 400 GHz.
It does not specify the signal modulation methods nor the coding methods, nor functional
features.
Environmental requirements and tests are not included.
NOTE – Compliance with this standard does not imply permission to establish communications with locations
outside the customer's installation or with other customers through the public supply system where this would
otherwise not be allowed.
2 Normative references1
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this section of IEC 61000-3. At the time of publication, the editions
indicated were valid. All normative documents are subject to revision, and parties to
agreements based on this section of IEC 61000-3 are encouraged to investigate the
possibility of applying the most recent editions of the normative documents indicated below.
Members of IEC and ISO maintain registers of currently valid International Standards.
IEC 60050(60): 1970, International Electrotechnical Vocabulary (IEV) – Chapter 60: Radio-
communications
IEC 60050(161): 1990, International Electrotechnical Vocabulary (IEV) – Chapter 161: Electro-
magnetic compatibility
CISPR 14: 1993, Limits and methods of measurement of radio disturbance characteristics of
electrical motor-operated and thermal appliances for household and similar purposes, electric
tools and electric apparatus
CISPR 16-1: 1993, Specification for radio disturbance and immunity measuring apparatus and
methods – Part 1: Radio disturbance and immunity measuring apparatus
CISPR 16-2: 1996, Specification for radio disturbance and immunity measuring apparatus and
methods – Part 2: Méthods of measurement of disturbances and immunity
CISPR 22: 1993, Limits and methods of measurement of radio disturbance characteristics of
information technology equipment
61000-3-8 © IEC:1997 – 11 –
3 General
The objects of this section are twofold:
– to prevent interference by mains signalling equipment to radiocommunications services
and other equipment connected to the network;
– to limit mutual interference between differing mains signalling equipments connected to
the same electrical network.
With regard to the former object and above 150 kHz, limits for maximum output terminal
voltage for household equipment are given in CISPR 14, and for information technology
equipment are given in CISPR 22. Neither of these specifically apply to mains signalling
equipment, but they have been used as guidance for the maximum output levels specified in
this section. However, it should be pointed out that the CISPR is concerned with involuntary
emissions whereas mains signalling is deliberate emission and, with some methods of
signalling, the signal level needs to be above the possible noise level in order to achieve
signalling success.
Below 150 kHz, there is no guidance and the values specified are considered appropriate and
consistent with the CISPR principles. Another factor at any frequency band is that there may
be, in some countries, regulatory guidelines for maximum emission levels for signalling which
must be observed.
With regard to the latter object, three classes of technique may be used to limit mutual
interference between different signalling systems:
a) physical separation, separation by means of filters to limit interchange of emissions, or
differential signal injection systems;
b) separation by frequency bands allocated to different types of application;
c) agreement to a common protocol, with identified and separate addressing mechanisms
for different applications to avoid contention.
The general rules for the assignment and use of frequencies in the range from 9 kHz to
400 GHz by radiocommunication services and definitions of these services are specified in
the ITU radio regulations which contain a table of frequency allocations. This standard takes
these allocations into account where it defines frequency bands for different applications, in
order to avoid disturbances to radiotelecommunications services. However, in the event of
actual disturbance being caused, then additional precautions will need to be applied. The ITU
regulations specify three regions, and frequency allocations vary between these regions.
Where requirements in specific regions having equipment within the scope of this section are
known to differ from values stated, this is recorded by means of a note (as in clause 7).
However, omission of such a note does not imply that frequency bands, output voltages, or
conducted or radiated disturbance values stated are necessarily acceptable in these regions.
In ITU region 1, AM broadcasting bands begin above 148,5 kHz, and to optimise the use of the
range in which mains signalling is allowed, and taking into account that there is no protocol
common to electricity supplier and customer applications, the CENELE
...
IEC 60793-1-60 ®
Edition 1.0 2017-02
INTERNATIONAL
STANDARD
colour
inside
Optical fibres –
Part 1-60: Measurement methods and test procedures – Beat length
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IEC 60793-1-60 ®
Edition 1.0 2017-02
INTERNATIONAL
STANDARD
colour
inside
Optical fibres –
Part 1-60: Measurement methods and test procedures – Beat length
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.10 ISBN 978-2-8322-3865-3
– 2 – IEC 60793-1-60:2017 © IEC 2017
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Testing conditions . 6
5 Reference test method . 6
6 Specimen . 6
7 Test methods . 6
7.1 Phase beat length measurement methods . 6
7.1.1 General . 6
7.1.2 Monitoring of output power using an electromagnet . 6
7.1.3 Monitoring of SOP using a lateral force . 8
7.2 Group beat length measurement method . 10
7.2.1 General . 10
7.2.2 Apparatus and procedure. 10
7.2.3 Calculation . 11
8 Results . 11
8.1 Information available with each measurement . 11
8.2 Information available upon request . 12
Annex A (informative) Difference of beat lengths by measurement method (phase
beat length and group beat length) . 13
A.1 Phase modal birefringence and phase beat length . 13
A.2 Group modal birefringence and group beat length . 13
Annex B (informative) Correlation between results obtained by the two methods
(phase beat length and group beat length) . 16
B.1 General . 16
B.2 Example of correlation between phase and group beat lengths in the case of
PANDA fibres . 16
B.3 Example of correlation between phase and group beat lengths in the case of
elliptical core fibres . 17
Annex C (informative) Electromagnet for Faraday rotation . 18
Bibliography . 19
Figure 1 – Apparatus of phase beat length measurement using an electromagnet . 6
Figure 2 – Example of measurement profile by electromagnet . 8
Figure 3 – Set-up for measuring L when monitoring SOP together with a
B(phase)
moving lateral force . 9
Figure 4 – SOP measured at different levels of lateral force . 10
Figure 5 – Example of SOP evolution and normalized Stokes vector components . 10
Figure B.1 – Wavelength dependence of B /B [3] . 16
group phase
Figure C.1 – Schematic of the electromagnet . 18
Table B.1 – B /B of elliptical core fibres . 17
group phase
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRES –
Part 1-60: Measurement methods and test procedures –
Beat length
FOREWORD
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60793-1-60 has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee 86: Fibre optics.
The text of this International Standard is based on the following documents:
CDV Report on voting
86A/1737/CDV 86A/1782/RVC
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60793 series, published under the general title Optical fibres, can
be found on the IEC website.
– 4 – IEC 60793-1-60:2017 © IEC 2017
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://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.
A bilingual version of this publication may be issued at a later date.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
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understanding of its contents. Users should therefore print this document using a
colour printer.
OPTICAL FIBRES –
Part 1-60: Measurement methods and test procedures –
Beat length
1 Scope
This part of IEC 60793 defines test methods for both the phase beat length, and the group
beat length. These two parameters are defined differently, and will give different results
depending on the type of polarization-maintaining (PM) fibre.
The phase beat length is the relevant parameter for the fibres ability to maintain a high
extinction ratio. This is described in more details in Annexes A and B.
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 60068-1, Environmental testing – Part 1: General and guidance
IEC 60793-1-1, Optical fibres – Part 1-1: Measurement methods and test procedures –
General and guidance
IEC 60793-1-48, Optical fibres – Part 1-48: Measurement methods and test procedures –
Polarization mode dispersion
IEC 60793-2-70 , Optical fibres – Part 2-70: Product specifications – Sectional specifications
for polarization-maintaining fibres
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60793-1-1 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 platfo
...
IEC 60793-1-60 ®
Edition 1.0 2017-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
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Optical fibres –
Part 1-60: Measurement methods and test procedures – Beat length
Fibres optiques –
Partie 1-60: Méthodes de mesure et procédures d’essai – Longueur de battement
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IEC 60793-1-60 ®
Edition 1.0 2017-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical fibres –
Part 1-60: Measurement methods and test procedures – Beat length
Fibres optiques –
Partie 1-60: Méthodes de mesure et procédures d’essai – Longueur de battement
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.10 ISBN 978-2-8322-9363-8
– 2 – IEC 60793-1-60:2017 © IEC 2017
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Testing conditions . 6
5 Reference test method . 6
6 Specimen . 6
7 Test methods . 6
7.1 Phase beat length measurement methods . 6
7.1.1 General . 6
7.1.2 Monitoring of output power using an electromagnet . 6
7.1.3 Monitoring of SOP using a lateral force . 9
7.2 Group beat length measurement method . 11
7.2.1 General . 11
7.2.2 Apparatus and procedure. 12
7.2.3 Calculation . 12
8 Results . 12
8.1 Information available with each measurement . 12
8.2 Information available upon request . 13
Annex A (informative) Difference of beat lengths by measurement method (phase beat
length and group beat length) . 14
A.1 Phase modal birefringence and phase beat length . 14
A.2 Group modal birefringence and group beat length . 14
Annex B (informative) Correlation between results obtained by the two methods
(phase beat length and group beat length) . 17
B.1 General . 17
B.2 Example of correlation between phase and group beat lengths in the case of
PANDA fibres . 17
B.3 Example of correlation between phase and group beat lengths in the case of
elliptical core fibres . 18
Annex C (informative) Electromagnet for Faraday rotation . 19
Bibliography . 20
Figure 1 – Apparatus of phase beat length measurement using an electromagnet . 7
Figure 2 – Example of measurement profile by electromagnet . 9
Figure 3 – Set-up for measuring L when monitoring SOP together with a
B(phase)
moving lateral force . 9
Figure 4 – SOP measured at different levels of lateral force . 11
Figure 5 – Example of SOP evolution and normalized Stokes vector components . 11
Figure B.1 – Wavelength dependence of B /B [3] . 17
group phase
Figure C.1 – Schematic of the electromagnet . 19
Table B.1 – B /B of elliptical core fibres . 18
group phase
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRES –
Part 1-60: Measurement methods and test procedures –
Beat length
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International Standard IEC 60793-1-60 has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee 86: Fibre optics.
The text of this International Standard is based on the following documents:
CDV Report on voting
86A/1737/CDV 86A/1782/RVC
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60793 series, published under the general title Optical fibres, can
be found on the IEC website.
– 4 – IEC 60793
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