IEC 61300-3-51:2014

Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-51: Examinations and measurements - Pin gauge withdrawal force for rectangular ferrule multi-fibre connectors

IEC 61300-3-51:2014 is intended to describe the procedure required to measure the pin gauge withdrawal force for rectangular ferrule multi-fibre connectors. This measurement can be used as an alternative to the measurement of the pin gauge insertion force, both of which evaluate the fit of the pin gauge(s) into the guide pin hole(s) of the female-type connector. The experimental verification of interchangeability between them is shown in Annex A. For the male-type connector, IEC 61300-3-49 is applied to evaluate how securely the guide pins are retained in the guide holes. Keywords: pin gauge withdrawal force, pin gauge insertion force

Dispositifs d'interconnexion et composants passifs à fibres optiques - Procédures fondamentales d'essais et de mesures - Partie 3-51: Examens et mesures - Force d'extraction d'une broche calibrée pour des connecteurs multifibres à férule rectangulaire

IEC 61300-3-51:2014 a pour objet de décrire la procédure requise pour mesurer la force d'extraction d'une broche calibrée, pour des connecteurs multifibres à férules rectangulaires. Cette mesure peut être utilisée comme alternative à la mesure de la force d'insertion de la broche calibrée, ces deux mesures évaluant la bonne adaptation de la (des) broche(s) calibrée(s) dans le ou les alésage(s) de la broche de guidage du connecteur femelle. La vérification expérimentale de l'interchangeabilité entre les deux mesures est traitée dans l'Annexe A. Pour les connecteurs mâles, l'IEC 61300-3-49 s'applique pour évaluer la qualité de rétention des broches de guidage dans leurs alésages. Mots clés: la force d'extraction d'une broche calibrée, la force d'insertion de la broche calibrée

General Information

• Status: Published
• Publication Date: 09-Oct-2014
• 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: PPUB - Publication issued
• Start Date: 10-Oct-2014
• Completion Date: 15-Nov-2014

Overview

IEC 61300-3-51:2014 is an international standard published by the International Electrotechnical Commission (IEC). It specifies basic test and measurement procedures for fibre optic interconnecting devices and passive components, focusing specifically on the pin gauge withdrawal force testing for rectangular ferrule multi-fibre connectors. This measurement technique assesses the fit quality of pin gauges inserted into the guide pin holes of female-type connectors, providing an alternative to pin gauge insertion force measurements. The standard ensures reliable and consistent testing methods to verify the mechanical interaction and tolerance compatibility of multi-fibre rectangular ferrule connectors.

Key Topics

• Pin Gauge Withdrawal Force Measurement: Defines the procedure to measure the force required to withdraw a pin gauge from the guide pin hole in a female-type connector. This parameter reflects the mechanical fit and retention of the pin gauge.
• Test Procedures: Two methods are described for carrying out these measurements:
  • Method A: Using calibrated weights to exert the withdrawal force.
  • Method B: Using a tensile testing machine for precise force measurement.
• Interchangeability with Insertion Force: The standard includes experimental verification that pin gauge withdrawal force measurements can serve as an alternative to pin gauge insertion force tests, offering flexibility in quality assessment.
• Test Apparatus: Detailed description of fixtures, pin gauges, plug gauges, and measurement devices necessary to perform accurate withdrawal force testing.
• Standardized Conditions: Ensures testing consistency by outlining test conditions such as temperature, humidity, and equipment calibration.
• Scope of Application: Focus on rectangular ferrule multi-fibre connectors, commonly used in high-density fibre optic networks.

Applications

IEC 61300-3-51:2014 is indispensable for manufacturers, testers, and quality assurance engineers working with fibre optic multi-fibre rectangular ferrule connectors. Its applications include:

• Quality Control: Ensuring guide pin holes in female-type connectors meet strict mechanical fit requirements, reducing the risk of poor mating and connection failures.
• Connector Interchangeability Testing: Validating whether connectors meet required mechanical tolerances for widespread interoperability across different manufacturers.
• Product Development: Assisting designers in optimizing connector mechanical interfaces for better durability and ease of assembly.
• Compliance with Industry Standards: Supporting adherence to IEC 61300 series standards which govern fibre optic interconnecting devices to ensure compatibility and performance.
• Maintenance and Inspection: Providing guidelines for periodic examination and measurement of connector performance in installed fibre optic systems.

Related Standards

IEC 61300-3-51:2014 is part of the IEC 61300 series, which includes various test and measurement procedures for fibre optic interconnecting devices. Key related standards include:

• IEC 61300-3-1: Visual examination procedures for fibre optic components.
• IEC 61300-3-49: Test methods related to the retention force of guide pins in male-type connectors.
• IEC 61754 series: Defines fibre optic connector interface standards including types MT, MPO, Mini-MPO, and MT-RJ which the pin gauge procedures apply to.
• ISO/IEC directives: Provides guidelines on standard development and application for electrotechnical components testing.

By adhering to IEC 61300-3-51, companies ensure rigorous, standardized testing that supports the mechanical reliability and interoperability of multi-fibre rectangular ferrule connectors in critical fibre optic communication infrastructure.

---

Keywords: IEC 61300-3-51, pin gauge withdrawal force, fibre optic connectors, rectangular ferrule, multi-fibre connectors, pin gauge insertion force, connector testing, fibre optic interconnecting devices, measurement procedures, IEC standards

Standards Content (Sample)

IEC 61300-3-51 ®
Edition 1.0 2014-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures –
Part 3-51: Examinations and measurements – Pin gauge withdrawal force for
rectangular ferrule multi-fibre connectors

Dispositifs d’interconnexion et composants passifs à fibres optiques –
Procédures fondamentales d’essais et de mesures –
Partie 3-51: Examens et mesures – Force d'extraction d’une broche calibrée
pour des connecteurs multifibres à férule rectangulaire
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IEC 61300-3-51 ®
Edition 1.0 2014-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures –
Part 3-51: Examinations and measurements – Pin gauge withdrawal force for

rectangular ferrule multi-fibre connectors

Dispositifs d’interconnexion et composants passifs à fibres optiques –

Procédures fondamentales d’essais et de mesures –

Partie 3-51: Examens et mesures – Force d'extraction d’une broche calibrée

pour des connecteurs multifibres à férule rectangulaire

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX Q
ICS 33.180.20 ISBN 978-2-8322-1886-0

– 2 – IEC 61300-3-51:2014 © IEC 2014

CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 General description . 7
3.1 General . 7
3.2 Test conditions . 7
4 Apparatus . 7
4.1 Fixture . 7
4.2 Pin gauge chuck . 7
4.3 Plug gauge chuck . 7
4.4 Pin gauge . 7
4.5 Plug gauge . 8
4.6 Weight . 9
4.7 Tensile testing machine . 9
5 Procedure . 9
5.1 Method A: Method using the weight (Figure 3) . 9
5.2 Method B: Method using the tensile testing machine (Figure 4) . 10
6 Details to be specified . 12
Annex A (informative) Experimental verification of the interchangeability between the
pin gauge insertion force and the pin gauge withdrawal force . 13
A.1 General . 13
A.2 Measurement system . 13
A.3 Measurement sample . 13
A.4 Measurement procedure . 14
A.5 Measurement results . 14
A.6 Conclusion . 15
Annex B (informative) Experimental verification of compatibility of Method A (method
using the weight) and Method B (method using the tensile testing machine) . 16
Bibliography . 17

Figure 1 – Pin gauge. 8
Figure 2 – Plug gauge for guide pin holes . 8
Figure 3 – Method A for examination of pin gauge/plug gauge withdrawal force
(method using the weight) . 10
Figure 4 – Method B for examination of pin gauge/plug gauge withdrawal force
(method using the tensile testing machine) . 11
Figure A.1 – Measurement system . 13
Figure A.2 – Insertion/withdrawal force measurement results . 14
Figure B.1 – Relation between the withdrawal force values measured by Method A and
Method B . 16

Table 1 – Test conditions . 7
Table 2 – Dimensions of the pin gauge . 8
Table 3 – Dimensions for plug gauge for guide pin holes . 9
Table A.1 – Guide hole pitch of measurement samples . 14

– 4 – IEC 61300-3-51:2014 © IEC 2014

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

Part 3-51: Examinations and measurements –
Pin gauge withdrawal force for rectangular ferrule multi-fibre connectors

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
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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.
International Standard IEC 61300-3-51 has been prepared by subcommittee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
The text of this standard is based on the following documents:
FDIS Report on voting
86B/3817/FDIS 86B/3844/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.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 61300 series, published under the general title, Fibre optic
interconnecting 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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication 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 61300-3-51:2014 © IEC 2014

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

Part 3-51: Examinations and measurements –
Pin gauge withdrawal force for rectangular ferrule multi-fibre connectors

1 Scope
This part of IEC 61300 is intended to describe the procedure required to measure the pin
gauge withdrawal force for rectangular ferrule multi-fibre connectors.
This measurement can be used as an alternative to the measurement of the pin gauge
insertion force, both of which evaluate the fit of the pin gauge(s) into the guide pin hole(s) of
the female-type connector. The experimental verification of interchangeability between them
is shown in Annex A.
For the male-type connector, IEC 61300-3-49 is applied to evaluate how securely the guide
pins are retained in the guide holes.
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.
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 61754-5, Fibre optic interconnecting devices and passive components – Fibre optic
connector interfaces – Part 5: Type MT connector family
IEC 61754-7-1, Fibre optic interconnecting devices and passive components – Fibre optic
connector interfaces – Part 7-1: Type MPO connector family – One fibre row
IEC 61754-7-2, Fibre optic interconnecting devices and passive components – Fibre optic
connector interfaces – Part 7-2: Type MPO connector family – Two fibre rows
IEC 61754-10, Fibre optic interconnecting devices and passive components – Fibre optic
connector interfaces – Part 10: Type Mini-MPO connector family
IEC 61754-18, Fibre optic interconnecting devices and passive components – Fibre optic
connector interfaces – Part 18: Type MT-RJ connector family
___________
To be published.
3 General description
3.1 General
This measurement method is applied for optical connectors specified in IEC 61754-5,
IEC 61754-7-1, IEC 61754-7-2, IEC 61754-10 and IEC 61754-18.
Two methods using weights or a tensile testing machine are described in this standard.
The optical connector is held using a fixture. For the measurement for a single guide pin hole,
the pin gauge is placed in a pin gauge chuck and the weight or the tensile testing machine is
connected to the pin gauge chuck.
For the measurement for two guide pin holes, the plug gauge is placed in a plug gauge chuck
and the weight or the tensile testing machine is connected to the plug gauge chuck. By using
the plug gauge, it is possible to check not only the size of each guide pin hole but also the
relative position and the relative angle between two guide pin holes.
3.2 Test conditions
For a precise measurement such as design verification, the test conditions shall be controlled
accurately as required in Table 1.
Table 1 – Test conditions
Temperature Relative humidity
°C % RH
22,0 – 24,0 50,0 ± 10,0
4 Apparatus
4.1 Fixture
The measurement shall not be affected by the connector fixture. The position and direction of
the connector during the test shall not change as the test is repeated. The connector shall be
placed in the fixture so that the front face of the connector housing is retained by the fixture
as shown in Figure 3 and Figure 4.
4.2 Pin gauge chuck
The pin gauge chuck shall have a pin gauge retention force much greater than the required
connector pin gauge withdrawal force, typically more than 200 N when using a tensile testing
machine. The connection of the pin gauge to the weight or the tensile testing machine chuck
shall not affect the measurement.
4.3 Plug gauge chuck
The plug gauge chuck shall have a plug gauge retention force much greater than the required
connector plug gauge withdrawal force, typically more than 200 N, when using a tensile
testing machine. The connection of the plug gauge to the weight or the tensile testing
machine chuck shall not affect the measurement.
4.4 Pin gauge
Figure 1 and Table 2 show the pin gauge and dimensions of the pin gauge. The pin gauge
shall have the required dimensions as specified in IEC 61754-5.

– 8 – IEC 61300-3-51:2014 © IEC 2014

BB
BC
B
IEC
Figure 1 – Pin gauge
Table 2 – Dimensions of the pin gauge
Dimensions
mm
Reference Remarks
Minimum Maximum
A 0,698 5 0,699 0
a
B 10,8 11,2
BA 0,2 0,4
BB 0,2 0,5
b
BC 6,0 –
a
Typical dimensions.
b
Surface roughness R = 0,1 µm for the length of dimension BC.
z
4.5 Plug gauge
Figure 2 and Table 3 show the plug gauge and its dimensions. The plug gauge shall have the
required dimensions as specified in IEC 61754-5.
W
∅0,001
W
BB
BC
U
0,000 5
IEC
Figure 2 – Plug gauge for guide pin holes

∅BA
∅A
D
∅BA
C
∅A
0,000 5
Table 3 – Dimensions for plug gauge for guide pin holes
Dimensions
mm
Reference Remarks
Minimum Maximum
A 0,698 5 0,699 0
For two pins
C 4,599 5 4,600 5
a
D 6,3 6,5
a
U 2,4 2,5
BA 0,2 0,4
BB 0,2 0,5
b
BC 6,0 6,5
a
Typical dimensions.
b
Surface roughness R = 0,1 µm for the length of dimension BC.
z
4.6 Weight
The weight to be used depends on the test to be carried out. The weight measurement is used
for pass/fail tests including final inspection.
4.7 Tensile testing machine
The tensile testing machine shall be able to record (and/or hold) the maximum value during
the measurement. The tensile testing machine measurement is used for design verification
testing.
5 Procedure
5.1 Method A: Method using the weight (Figure 3)
The following steps shall be taken:
a) Prepare the device under test (DUT) according to the manufacturer’s instructions and
check the appearance in accordance with IEC 61300-3-1.
b) Place the DUT in the fixture.
c) Place the pin gauge or the plug gauge in the chuck.
d) Insert the pin gauge or the plug gauge into the guide pin hole(s) of the connector by more
than 5,5 mm.
e) Fix the weight to the chuck. Adjust the total weight of the jig and the weight to the
specified value.
f) Apply the weight slowly. Be sure that the force is applied along the axis of the guide pin
hole(s).
g) Wait for the specified duration. Record if the pin gauge or the plug gauge is withdrawn by
the specified force. Unless otherwise specified, the maximum duration shall be 15 s.

– 10 – IEC 61300-3-51:2014 © IEC 2014

Fixture
Fixture
DUT
DUT
(optical connector)
(optical connector)
Pin gauge
Plug gauge
Pin gauge
chuck
Plug gauge
chuck
Weight
Weight
IEC
IEC
Figure 3a – Measurement for single hole Figure 3b – Measurement for two holes
Figure 3 – Method A for examination of pin gauge/plug gauge withdrawal force
(method using the weight)
5.2 Method B: Method using the tensile testing machine (Figure 4)
The following steps shall be taken:
a) Prepare the device under test according to the manufacturer’s instructions and check the
appearance in accordance with IEC 61300-3-1.
b) Place the DUT in the fixture.
c) Place the pin gauge or the plug gauge in the chuck.
d) Insert the pin gauge or the plug gauge into the guide pin hole(s) of the connector by more
than 5,5 mm.
e) Connect the chuck to the tensile testing machine.
f) Apply tension using the tensile testing machine. The weight of the chuck should be
factored in. Be sure that the force is applied along the axis of the guide pin hole(s).
g) Measure and record the maximum value when the pin gauge or the plug gauge is
withdrawn. Rate of application shall be approximately 25 mm/min when the rate is not
otherwise specified.
Fixture
Fixture
DUT
DUT
(optical connector)
(optical connector)
Pin gauge
Plug gauge
Pin gauge
Plug gauge
chuck
chuck
Tensile testing
Tensile testing
machine
machine
IEC IEC
Figure 4a – Measurement for single hole Figure 4b – Measurement for two holes
Figure 4 – Method B for examination of pin gauge/plug gauge withdrawal force
(method using the tensile testing machine)

– 12 – IEC 61300-3-51:2014 © IEC 2014

6 Details to be specified
The following details, as applicable, shall be stated in the relevant specification:
– DUT preparation;
– Acceptable value of withdrawal force;
– Allowable withdrawing time of method using weight;
– Deviations from this test method;
– Measurement uncertainty.
Annex A
(informative)
Experimental verification of the interchangeability between the pin
gauge insertion force and the pin gauge withdrawal force

A.1 General
The pin gauge insertion force for rectangular ferrule is specified in standards such as
IEC 61754-5. However, the measurement is so demanding that in many cases it needs some
specially fabricated equipment to be carried out with enough accuracy and repeatability.
Therefore, less demanding pin gauge withdrawal force is recommended as an alternative to
the pin gauge insertion force. To verify the interchangeability between the pin gauge insertion
force and the pin gauge withdrawal force, the following experiment was conducted.
A.2 Measurement system
MPO-holder
DUT (MPO)
Plug gauge
Plug gauge holder
Digital force gauge
Y
X
Z
Z-slidable stage
XY-alignment stage
IEC
Figure A.1 – Measurement system
The measurement system is shown in Figure A.1. The plug gauge is attached to the sensor
head of the digital force gauge and aligned with the MPO connector. The digital force gauge is
fixed on the Z-slidable stage and the MPO-holder is attached on the XY-alignment stage. The
MPO holder and the plug gauge holder have some looseness to allow the MPO and the plug
gauge to make slight angular movement for precise alignment of their axes.
A.3 Measurement sample
Measurement samples are prepared so that they represent the dimensions of the centre of the
specification and the edge of the specification, respectively.

– 14 – IEC 61300-3-51:2014 © IEC 2014

Table A.1 – Guide hole pitch of measurement samples
Sample A Sample B
mm mm
a
Guide hole pitch 4,601 4,603
a
Specification for the guide hole pitch: 4,600 ±0,003.
A.4 Measurement procedure
The following steps shall be taken:
a) Set the DUT on the MPO holder.
b) Align the guide holes with the plug gauge using the XY-alignment stage.
c) Move the Z-slidable stage and insert the plug gauge into the guide holes.
d) Read and record the peak value of force gauge for each 0,5 mm insertion until the
insertion length reaches to 5,5 mm.
e) Move the Z-slidable stage and withdraw the plug gauge from the guide holes.
f) Read and record the peak value of force gauge for each 0,5 mm withdrawal until the plug
gauge is completely withdrawn.
Repeat step a) to f) five times.
A.5 Measurement results
Sample A
3,5
3,0
Inserting
2,5
Withdrawing
Insertion Withdrawal
2,0
force force
1,5
N N
1,0
Average 0,855 0,818
0,5
Standard 0,053 9 0,059 5
0,0
n 5 5
0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0 5,5
Insertion / withdrawal length (mm)

Sample B
3,5
Insertion Withdrawal
3,0
Inserting
force N force N
2,5
Withdrawing
Average 1,716 1,746
2,0
Standard 0,107 4 0,075 3
1,5
n 5 5
1,0
0,5
0,0
0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0 5,5
Insertion / withdrawal length (mm)

Figure A.2 – Insertion/withdrawal force measurement results

Force (N) Force (N)
A.6 Conclusion
For both samples and each insertion leng
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