IEC 61300-3-25:2013

Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-25: Examinations and measurements - Concentricity of the non-angled ferrules and non-angled ferrules with fibre installed

IEC 61300-3-25:2013 describes the procedure to determine the concentricity of the axis of the bore in a non-angled ferrule with the axis of the ferrule, or in the case of non-angled ferrules with fibre installed, to determine the concentricity of the axis of the fibre core with the axis of the ferrule. This second edition cancels and replaces the first edition published in 1997 and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- reconsideration of method A with the idea of applying a signal processor;
- introduction of two new annexes (A and B). Keywords: concentricity of the axis of the bore, non-angled ferrule

Dispositifs d'interconnexion et composants passifs à fibres optiques - Méthodes fondamentales d'essais et de mesures - Partie 3-25: Examens et mesures - Concentricité des férules sans angle et des férules sans angle avec fibre montée

La CEI 61300-3-25:2013 décrit une procédure en vue de déterminer la concentricité de l'axe de l'alésage d'une férule sans angle avec l'axe de la férule, ou dans le cas de férules sans angle avec fibre montée, de déterminer la concentricité de l'axe du coeur de la fibre avec l'axe de férule. Cette deuxième édition annule et remplace la première édition parue en 1997; elle constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- révision de la méthode A en vue d'utiliser un processeur de signaux;
- introduction de deux nouvelles annexes (A et B). Mots clés: concentricité de l'axe de l'alésage, férule sans angle

General Information

• Status: Published
• Publication Date: 12-Sep-2013
• ICS: 33.180.20 - Fibre optic interconnecting devices
• Technical Committee: SC 86B - Fibre optic interconnecting devices and passive components
• Drafting Committee: WG 4 - TC 86/SC 86B/WG 4
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 30-Aug-2016

Relations

• Revised: IEC 61300-3-25:2016 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-25: Examinations and measurements - Concentricity of non-angled ferrules and non-angled ferrules with fibre installed
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61300-3-25
®

Edition 2.0 2013-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures –
Part 3-25: Examinations and measurements – Concentricity of the non-angled
ferrules and non-angled ferrules with fibre installed

Dispositifs d’interconnexion et composants passifs à fibres optiques –
Procédures fondamentales d’essais et de mesures –
Partie 3-25: Examens et mesures – Concentricité des férules sans angle et des
férules sans angle avec fibre montée

IEC 61300-3-25:2013

---------------------- Page: 1 ----------------------
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IEC 61300-3-25

®


Edition 2.0 2013-09




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures –

Part 3-25: Examinations and measurements – Concentricity of the non-angled


ferrules and non-angled ferrules with fibre installed



Dispositifs d’interconnexion et composants passifs à fibres optiques –


Procédures fondamentales d’essais et de mesures –

Partie 3-25: Examens et mesures – Concentricité des férules sans angle et des

férules sans angle avec fibre montée










INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX L


ICS 33.180.20 ISBN 978-2-8322-1104-5



Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 2 – 61300-3-25 © IEC:2013
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 General description . 5
3.1 General . 5
3.2 Method A: Ferrule surface reference method (reference test method) . 6
3.3 Method B: Core centre reference method in fibre assembled ferrule . 6
3.4 Method C: Ferrule bore reference method for bare ferrule . 6
4 Apparatus . 6
4.1 Method A . 6
4.2 Method B . 6
4.3 Method C . 7
5 Procedure . 7
5.1 Method A . 7
5.2 Method B . 7
5.3 Method C (only applicable to ferrules without fibre installed) . 8
6 Details to be specified . 9
6.1 Method A . 9
6.2 Method B . 9
6.3 Method C . 9
Annex A (informative) Method to determine the centre of the ferrule bore (bare
ferrule case) using a signal processor . 10
Annex B (informative) Method to determine the fibre core centre using a signal
processor . 11

Figure 1 – Definition of concentricity misalignment . 6
Figure 2 – Example of set-up for concentricity measurement (method A) . 7
Figure 3 – Example of set-up for concentricity measurement (method B) . 8
Figure 4 – Example of set-up for concentricity measurement (method C) . 8

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61300-3-25 © IEC:2013 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –

Part 3-25: Examinations and measurements – Concentricity of
the non-angled ferrules and non-angled ferrules with fibre installed

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
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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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 61300-3-25 has been prepared by subcommittee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
This second edition cancels and replaces the first edition published in 1997 and constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) reconsideration of method A with the idea of applying a signal processor;
b) introduction of two new annexes (A and B).

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The text of this standard is based on the following documents:
CDV Report on voting
86B/3548/CDV 86B/3631/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 the parts of IEC 61300 series, 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 publication will remain unchanged until
the stability 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.

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61300-3-25 © IEC:2013 – 5 –
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –

Part 3-25: Examinations and measurements – Concentricity of
the non-angled ferrules and non-angled ferrules with fibre installed



1 Scope
This part of IEC 61300 describes the procedure to determine the concentricity of the axis of
the bore in a non-angled ferrule with the axis of the ferrule, or in the case of non-angled
ferrules with fibre installed, to determine the concentricity of the axis of the fibre core with the
axis of the ferrule.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
ISO 2538, Geometrical product specifications (GPS) – Series of angles and slopes on wedges
and prisms
3 General description
3.1 General
This procedure describes the measurement of concentricity of ferrules and ferrules with
assembled fibres. Concentricity is defined as twice the distance between the axis of the
ferrule and axis of inner diameter of the ferrule (ferrule bore), or in the case of ferrules with
fibre installed twice the distance between the axis of the ferrule and the axis of the core of the
installed fibre (see Figure 1). When concentricity measurements are made with fibre installed
the results will be affected by geometry of the fibre and the fit of the fibre in the ferrule inner
diameter. Imperfections to cylindricity and circularity of the outside diameter of the specimen
will influence the measurement results.

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– 6 – 61300-3-25 © IEC:2013

Axis of ferrule
Axis of ferrule core or ferrule bore
Concentricity
C
Fibre core
or ferrule bore
Ferrule
IEC  294/97

Figure 1 – Definition of concentricity misalignment
Three methods of measuring concentricity are described as follows:
3.2 Method A: Ferrule surface reference method (reference test method)
In this method the ferrule or ferrule with fibre installed is placed in a "V-groove" or centring
mechanism, and rotated. The displacement of the ferrule inner diameter or fibre core is
observed and the concentricity determined.
3.3 Method B: Core centre reference method in fibre assembled ferrule
This method uses a roundness measuring instrument to measure concentricity. In this method,
the core axis is fixed at the axis of the measuring instrument and the concentricity is
determined by measuring, usually with a probe, the displacement of the outer diameter of the
ferrule as the ferrule is rotated.
3.4 Method C: Ferrule bore reference method for bare ferrule
This method uses a dial test indicator (DTI) to measure concentricity. In this method the axis
of the ferrule bore is fixed at the axis of the measuring instrument and the concentricity is
determined by measuring, usually with a probe, the displacement of the outer diameter of the
ferrule as the ferrule is rotated. This method is only applied to the ferrules without fibre
installed and typically used for multimode fibre ferrules.
4 Apparatus
4.1 Method A
– V-groove or centring mechanism (for example air gauge) mounted on a micro-manipulator.
According to ISO 2538, the preferred angle for a V-groove is 108°
– Microscope with video camera
– Monitor
– Light source. A lamp is suitable for this procedure
– Signal processor (optional)
4.2 Method B
– Roundness measuring instrument with microscope
– Light source. A lamp is suitable for this procedure

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61300-3-25 © IEC:2013 – 7 –
4.3 Method C
– Electric roundness measuring instrument
The equipment shall have two tapered spindles to mount the ferrule. The tips of the two
spindles shall be aligned precisely to the rotation axis. The roughness of the tip of the
spindles shall be specified in the relevant specification.
5 Procedure
5.1 Method A
a) Clean the ferrule bore thoroughly to assure it is free of dirt, burrs or other obstructions.
Place the ferrule in the V-groove or centring mechanism as shown in Figure 2.
b) Illuminate the bore or the fibre.
c) Position the ferrule in the centre of the target circle on the monitor using the micro-
manipulator. If a signal processor is used, locate the ferrule bore centre using method
described in Annex A or the fibre core centre using method described in Annex B.
d) Rotate the ferrule through 180°.
e) If a signal processor is used, locate the ferrule bore centre using the method described in
Annex A, or the fibre core centre using the method described in Annex B.
f) Record the maximum displacement C of the fibre core image of the ferrule inner diameter.
Core image
V-groove or
before rotation
centring mechanism
Microscope
C
O
σ
Ferrule
Lamp
Video camera C
Core image after rotation (180°)
Optional
O: Centre of the core before rotation
signal processor
σ: Centre of the core after rotation
Monitor
IEC  295/97

Figure 2 – Example of set-up for concentricity measurement (method A)
5.2 Method B
a) Mount the ferrule assembly on the roundness measuring instrument as shown in Figure 3.
b) Using an X-Y table on the roundness measuring instrument, the ferrule position is
adjusted so that the centre of the fibre core is set exactly at the centre of the rotation axis.
The centre of the core is estimated by illuminating the core from the other end of the fibre.
c) Contact the pick-up of the roundness measuring instrument to the ferrule outer surface so
as to measure the displacement of the outer surface of the ferrule as the ferrule is rotated.

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– 8 – 61300-3-25 © IEC:2013
d) Rotate the specimen a minimum of 360° and record the maximum reading from the
roundness gauge as C and the minimum reading as C . Concentricity of the part is the
1 2
difference between the maximum and minimum values (C = C – C ; see Figure 3).
1 2

Centre of rotation
Pick-up
(centre of the core)
Ferrule outer Centre of rotation
Recorder
surface (centre of the core)
Microscope
O
s
DUT
O
f
Chuck
C
2
X-Y table
Roundness
C
1
measuring
instrument
Lamp Fibre
Centre of the ferrule
Concentricity C = C - C
1 2
IEC  296/97

Figure 3 – Example of set-up for concentricity measurement (method B)
5.3 Method C (only applicable to ferrules without fibre installed)
Support the ferrule with two tapered spindles against the bores as shown in

0,5 mm
Pick-up
DUT
Spindle
Rotation
IEC  297/97

a) Figure 4.
b) Contact the pick-up of the roundness measuring instrument to the ferrule outer diameter
surface so as to measure the displacement of the outer diameter of the ferrule as the
ferrule is rotated.
c) Rotate the specimen a minimum of 360° and record the maximum reading from the
roundness measuring instrument as C and the minimum reading as C . Concentricity of
1 2
the part is the difference between the maximum and minimum values.

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61300-3-25 © IEC:2013 – 9 –
6 Details to be specified
6.1 Method A
The following details, as applicable, shall be specified in the relevant specification:
– Allowable concentricity
– Magni
...