IEC 61300-3-33:2012

IEC 61300-3-33 ®
Edition 2.0 2012-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures –
Part 3-33: Examinations and measurements – Withdrawal force from a resilient
alignment sleeve using gauge pins

Dispositifs d’interconnexion et composants passifs fibroniques – Méthodes
fondamentales d'essais et de mesures –
Partie 3-33: Examens et mesures – Force d’extraction d’un manchon
d’alignement élastique, avec utilisation de broches calibrées

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IEC 61300-3-33 ®
Edition 2.0 2012-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures –
Part 3-33: Examinations and measurements – Withdrawal force from a resilient

alignment sleeve using gauge pins

Dispositifs d’interconnexion et composants passifs fibroniques – Méthodes

fondamentales d'essais et de mesures –

Partie 3-33: Examens et mesures – Force d’extraction d’un manchon

d’alignement élastique, avec utilisation de broches calibrées

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.20 ISBN 978-2-8322-7276-3

– 2 – IEC 61300-3-33:2012  IEC 2012
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 General description . 5
4 Apparatus . 6
4.1 General . 6
4.2 Test unit . 6
4.3 Gauge pins . 6
4.4 Solvent . 7
5 Test set up . 7
6 Procedure . 7
6.1 General . 7
6.2 Testing . 7
7 Calculation or interpretation of results . 8
8 Details to be specified . 8
Annex A (normative) Loading velocity . 9
Annex B (informative) Round-robin test results of zirconia alignment sleeves . 10

Figure 1 – Test unit with applied force on the gauge pin . 6
Figure B.1 – Test unit . 11
Figure B.2 – Round-robin test results . 11

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

Part 3-33: Examinations and measurements –
Withdrawal force from a resilient alignment sleeve using gauge pins

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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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 61300-3-33 has been prepared by subcommittee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
This bilingual version (2019-08) corresponds to the monolingual English version, published in
2012-02.
This second edition cancels and replaces the first edition published in 1999. It constitutes a
technical revision. The changes with respect to the previous edition are to reconsider the
entire document according to the updated IEC rules and to add a gauge and a solvent into
Clause 4, and to add a general subclause and cleaning procedure into Clause 6.

– 4 – IEC 61300-3-33:2012  IEC 2012
The text of this standard is based on the following documents:
CDV Report on voting
86B/3221/CDV 86B/3289/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.
The French version of this standard has not been voted upon.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all the parts in the 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.
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –

Part 3-33: Examinations and measurements –
Withdrawal force from a resilient alignment sleeve using gauge pins

1 Scope
This part of IEC 61300 describes the procedure to measure the withdrawal force between the
ferrule (gauge pin) of the plug connector and the resilient alignment sleeve of the adapter. The
gauge pin should have the same shape (chamfer) like the normal ferrules described in the
optical interface, see IEC 61755-3 series and IEC 61754 series. This measurement procedure
is applicable to single-fibre cylindrical ferrule optical connectors.
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 61300-1, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 1: General and guidance
IEC 61754 (all parts), Fibre optic connector interfaces
IEC 61755-3 (all parts), Fibre optic connector optical interfaces
IEC/TR 62627-01, Fibre optic interconnecting devices and passive components – Part 01:
Fibre optic connector cleaning methods
3 General description
The contact force between the mating ferrules in a fibre optic connector is the difference
between the breakaway friction force and the spring force of the connector. To maintain
contact, the breakaway friction force must remain below the spring force.
The ferrule withdrawal force is the highest force (breakaway force) required to remove one of
the ferrules from the sleeve of a fibre optic connector.
The mechanics of friction result in significant variations in the measurement of breakaway
friction force. The criteria to be applied to the results of these measurements must account for
the spread that is inherent in the mechanism being measured (see Annex B).

– 6 – IEC 61300-3-33:2012  IEC 2012
4 Apparatus
4.1 General
The specimen is a resilient sleeve of a connector set. The measurement is made with two
gauge pins inserted so that they meet at the centre of the sleeve. Force is applied to the end
of one of the gauge pins as shown in Figure 1.
Gauge pin assembly
b
Sleeves
Stop
a
F
IEC  174/12
Key
a, b Gauge pin
F  Withdrawal force
Figure 1 – Test unit with applied force on the gauge pin
4.2 Test unit
A force is applied to the gauge pin with a force generator that applies a continuously
increasing force and is equipped with a force gauge to record the peak force that occurs at
breakaway (see Annex A).
The test unit is a sleeve with two gauge pins inserted so as to touch at the centre of the sleeve.
The interface between the two gauge pins shall be located within 10 % of the length of the
sleeve from the centre of the sleeve itself.
4.3 Gauge pins
The gauge pins may be solid pins or connector ferrules that meet the gauge pin requirements.
The gauge pin assembly consists of the gauge pin and a fixture for the application of load.
The gauge pin is generally produced to the maximum material size of the resilient feature. The
gauge pin shall be defined in the relevant specification. The definition shall include dimensions,
material, surface hardness, roughness for the area of the gauge in contact with the resilient
member and cylindricity.
The requirements for the gauge pin are as follows:

a) diameters of the gauge pins shall be as specified in the relevant specification;
b) the diameter of the two gauge pins used in a given test shall be within 0,5 µm of each
other;
c) the lengths of each gauge pin shall be sufficient to allow it to extend half-way into the
sleeve and have enough left protruding out of the sleeve to allow for the attachment of a
fixture or force generator;
d) the end of the gauge pin that is inserted shall have a nominal 45 ° chamfer to a depth of
0,1mm (breaking the edge of the gauge pin).
e) the following normative values shall be used where the parameters are not defined in the
relevant specification:
– zirconia ceramics shall be the material used;
– surface finish (Ra) and roundness shall be within 0,2 µm and 0,5 µm, respectively.
4.4 Solvent
Prior to testing, each resilient alignment sleeve and gauge pin shall be cleaned by wiping,
using for example lint-free wipes and swabs. The cleaning action shall consist of thorough
rubbing or scrubbing. Moistening wipes should be avoided. If moistening is necessary,
following cleaning, resilient alignment sleeve and gauge pins are preconditioned at 40 °C for
0,5 h and then returned to room temperature for at least 0,5 h.
As solvent it is recommended to use IPA (isopropyl alcohol), see also IEC/TR 62627-01.
It is recommended to choose solvents and cleaning agents in the observance of safety rules.
5 Test set up
Force is applied to the end of one of the gauge pins and to the edge of the sleeve as shown in
Figure 1.
The test fixture shall be such that only two forces are applied to the moving gauge pin: the
force withdrawing the pin, and the frictional force between the gauge pin and the sleeve.
The force on the pin should be applied along the axis of the sleeve, as shown in Figure 1.
The linkage through which force is applied to the gauge pin assemblies shall not apply a
bending load. Either swivel joints or flexible members are recommended when a load is
applied to the gauge pin assemblies.
The sleeves shall be reversed for a second set of measurements.
6 Procedure
6.1 General
The measurement is made using a force generator. Force is applied to one gauge pin, in order
to extract it while the other gauge pin remains in place. During the test the resilient sleeve
shall be free to move in radial direction.
6.2 Testing
Effort should be taken during the test to avoid any contamination of the sleeves or gauges. To
compensate for the weight of the test fixture, the indicator on the force gauge shall be
adjusted to zero.
Force is to be applied at a continuous rate (see Annex A).
The maximum force applied to the gauge pin shall be recorded during extraction of the first
third part of the whole length of the gauge pin inserted into the sleeve.

– 8 – IEC 61300-3-33:2012  IEC 2012
Unless otherwise specified, an equal number of measurements shall be made from each end
of the sleeve.
7 Calculation or interpretation of results
Unless otherwise specified, the set of data from the end of the sleeve with the higher values of
withdrawal force shall be used to characterize the sleeve.
Sampling plans and the analysis of the results should be specified in the relevant specification.
See Annex B for estimates of the repeatability and reproducibility of ferrule withdrawal force
measurements.
8 Details to be specified
The relevant specification shall specify the following details:
– gauge characteristics (dimensions, roundness and cylindricity of gauge pins and rings,
material hardness and surface roughness at the bearing surfaces);
− maximum allowable gauge retention force;
− pre-conditioning procedure;
− recovery procedure;
− acceptance/failure criteria;
− number of times the test is performed on each component;
− configuration of the component under test;
– any deviations from measuring procedure;
– sampling plan;
– procedures for analysis of the data.

Annex A
(normative)
Loading velocity
The rate at which force applied to the test unit shall be increased is limited by the response or
the capture rate of the force gauge. With a mechanically driven instrument, the rate at which
force increases is a function of both the velocity of the cross-head and the stiffness of the
linkage between the cross-head and the test unit.
Loading rates of approximately 100 mm/min are generally considered acceptable for mech-
anically driven instruments. The following equation may be used to evaluate peak error:
KV
E =
R
c
where,
force
K is the system stiffness ;
{ }
distance
distance
V is the velocity of the crosshead ;
{ }
time
events
R is the capt
...