FprEN IEC 61300-3-52:2026

• Status: Not Published
• Publication Date: 03-Mar-2027
• ICS: 33.180.20 - Fibre optic interconnecting devices
• Technical Committee: CLC/TC 86BXA - Fibre optic interconnect, passive and connectorised components
• Current Stage: 5020 - Vote circulated - Formal Approval
• Start Date: 23-Oct-2026
• Due Date: 31-Dec-2025
• Completion Date: 23-Oct-2026
• Ref Project: oSIST prEN IEC 61300-3-52:2025 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-52: Examinations and measurements - Guide hole and alignment pin deformation constant for angled physically contacting rectangular ferrules with single-mode fibre

• Revises: EN 61300-3-52:2014 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-52: Examinations and measurements - Guide hole and alignment pin deformation constant, CD for 8 degree angled PC rectangular ferrule, single mode fibres
• Effective Date: 18-Jul-2023

FprEN IEC 61300-3-52:2026 is a CLC/IEC document for fibre optic interconnecting devices and passive components. It specifies a test and measurement procedure for the guide pin hole and guide pin deformation constant, CDE, for angled physically contacting rectangular ferrules with single-mode fibre. Engineers, manufacturers, and test labs use it to measure how the ferrule and guide pin system behaves under mating force and to report the result in a consistent way.

What does FprEN IEC 61300-3-52:2026 specify?

FprEN IEC 61300-3-52:2026 specifies a procedure for measuring CDE on angled PC rectangular ferrule multi-fibre connectors. The document is focused on one measurement method, supported by defined test conditions, apparatus, sample preparation, and reporting items.

The document is organised into these main parts:

• Clause 1 - Scope
• Clause 2 - Normative references
• Clause 3 - Terms and definitions
• Clause 4 - General description
• Clause 5 - Apparatus
• Clause 6 - Procedure
• Clause 7 - Details to be specified and reported
• Bibliography

In practice, that means the standard is aimed at laboratory measurement and technical reporting, not at describing the full connector design. It gives the method needed to check deformation behaviour that affects fibre core alignment in the y-direction.

What are the key requirements of FprEN IEC 61300-3-52:2026?

FprEN IEC 61300-3-52:2026 links guide pin deformation to the nominal y-offset location of fibre cores. Clause 4 explains why the measurement matters: deformation changes transverse translation and therefore the core position seen during mating.

Measurement conditions and setup

Clause 4.2 requires controlled laboratory conditions for precise measurements: temperature between 22.0 °C and 24.0 °C, and relative humidity of 50.0 % RH ± 10.0 % RH. This matters because the result is used for design verification and similar precise checks.

Clause 5.1 defines the precision measurement setup. The apparatus includes a force setter, force indicator, position indicator, scale head, and scale stage. The linear displacement scale has 10 nm resolution over a 30 µm range, and the force gauge has a maximum rated capacity up to 4.45 N with 0.04 N resolution.

Choosing the test condition

Clause 5.2 ties the test condition to the connector interface. The user identifies the nominal mating force and guide pin dimensions from the relevant IEC 61754 series specification, then uses the matching deformation force, FDE. The document gives alternative combinations for 9.8 N or 19.6 N mating force and 0.5480 mm or 0.6995 mm guide pin diameter, so the test matches the connector family being assessed.

Sample preparation

Clause 6.1 requires the rectangular ferrule to be fixed at the edge of a gauge block with adhesive so that deformation during measurement is negligible. The ferrule must be centred on the gauge block, the surfaces must be cleaned before fixing, and the adhesive must not touch the guide pin holes. Guide pins are inserted with protrusion from the ferrule of less than 0.5 mm.

Measurement procedure and result

Clause 6.2 sets out the force-displacement measurement. The sample is placed between the scale head and scale stage, the scale head touches one protruding guide pin, and the initial displacement is set to zero. The force starts at a minimum of 0.5 N and increases in 0.1 N steps up to the applicable maximum, with five repeats for each guide pin hole.

The average values are plotted on a force-displacement graph, and a linear regression is used to determine CDE at the specified deformation force. For pre-angled ferrules, the distance between the scale head and the ferrule edge supporting the pin must be less than 300 µm.

Reporting

Clause 7 lists what the relevant specification and test report shall include: DUT characteristics, equipment details, measurement uncertainty, preconditioning, measurement conditions, final calculations and performance requirements, additional pass/fail criteria, and any deviations from the procedure. This is the part readers use to make sure the test record is complete and traceable.

What terms does FprEN IEC 61300-3-52:2026 define?

• CDE - the guide pin hole and guide pin deformation constant measured by this procedure.
• PC - physically contacting, referring to the angled physical contact style used by the ferrule interface.
• DUT - device under test, the sample or connector being measured.
• FDE - deformation force, the force point used to derive CDE from the measurement data.
• RH - relative humidity, one of the controlled ambient conditions for measurement.
• α - a coefficient that depends on the difference between guide pin hole pitches for mated plugs and varies between 0 and 1.

Who uses FprEN IEC 61300-3-52:2026?

FprEN IEC 61300-3-52:2026 is used by fibre optic connector manufacturers, test laboratories, and engineers responsible for design verification and product evaluation. Quality teams use it to define the test setup, repeatability, and reporting content for connector measurements. It is especially relevant for work on MT and MPO family interfaces and other angled PC rectangular ferrule multi-fibre connectors.

What changed in FprEN IEC 61300-3-52:2026 from the previous edition?

FprEN IEC 61300-3-52:2026 replaces the first edition published in 2014. The document states three significant technical changes:

• inclusion of 19.6 N mating force and 0.5480 mm diameter pins, covering 16 fibre and multi-row ferrule variants
• clarification of the CDE measurement setup
• improved definition of the α parameter

Which standards are used with FprEN IEC 61300-3-52:2026?

• IEC 61754-5 - provides the Type MT connector family interface specification used to identify the relevant mechanical interface details.
• IEC 61754-7 (all parts) - provides the Type MPO connector family interface specification used for the connector interface dimensions and family details.
• IEC 61755-3 (all parts) - provides connector optical interface parameters for single-mode fibres, including the dimensions used in the deformation model.

What does the FprEN IEC 61300-3-52:2026 document contain?

The document includes a measurement model, a force-displacement procedure, and reporting requirements for CDE. It also includes figures for interface dimensions, the precision linear scale measurement setup, sample preparation, and an example of determining CDE from a regression line.

Table 1 gives the measurement conditions, and Table 2 gives the test conditions linked to mating force and guide pin diameter. These items support design verification, testing, and technical reporting by showing exactly how the sample is prepared and how the result is derived.

SLOVENSKI STANDARD
01-december-2025
Optični spojni elementi in pasivne komponente - Osnovni preskusni in merilni
postopki - 3-52. del: Preverjanje in meritve - Vodilna luknja in konstanta
deformacije poravnalnega trna za pravokotne ferule s fizičnim stikom pod kotom,
enorodovna optična vlakna
Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures - Part 3-52: Examinations and measurements - Guide hole
and alignment pin deformation constant for angled physically contacting rectangular
ferrules with single-mode fibre
Dispositifs d’interconnexion et composants passifs fibroniques - Procédures
fondamentales d’essais et de mesures - Partie 3-52: Examens et mesurages - Constante
de déformation de l’alésage de guidage et de la broche d’alignement, pour férules
rectangulaires en contact physique avec angle, fibres unimodales
Ta slovenski standard je istoveten z: prEN IEC 61300-3-52:2025
ICS:
33.180.20 Povezovalne naprave za Fibre optic interconnecting
optična vlakna devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

86B/5119/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61300-3-52 ED2
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-10-17 2026-01-09
SUPERSEDES DOCUMENTS:
86B/5013/CD, 86B/5046A/CC
IEC SC 86B : FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS
SECRETARIAT: SECRETARY:
Japan Mr Ryo Koyama
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):

ASPECTS CONCERNED:
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
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submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Fibre optic interconnecting devices and passive components - Basic test and measurement
procedures - Part 3-52: Examinations and measurements – Guide hole and alignment pin deformation
constant for angled physically contacting rectangular ferrules with single-mode fibre

PROPOSED STABILITY DATE: 2032
NOTE FROM TC/SC OFFICERS:
this electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee
positions. You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose
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IEC CDV 61300-3-52 © IEC 2025
1 CONTENTS
3 FOREWORD . 2
4 1 Scope . 4
5 2 Normative references . 4
6 3 Terms and definitions . 4
7 4 General description . 4
8 4.1 General . 4
9 4.2 Measurement conditions . 5
10 5 Apparatus . 5
11 5.1 Measurement setup . 5
12 5.2 Measurement sample configuration . 6
13 6 Procedure . 7
14 6.1 Sample preparation . 7
15 6.2 Measurement procedure . 7
16 7 Details to be specified and reported. 8
17 Bibliography . 10
19 Figure 1 – Interface dimensions showing nominal y-offset, Y , of fibre cores . 6
i
20 Figure 2 – Precision linear scale and CDE measurement setup . 7
21 Figure 3 – Sample preparation . 8
22 Figure 4 – Example of how to determine CDE value from regression line . 9
24 Table 1 – Measurement conditions. 6
25 Table 2 – Test conditions . 8
IEC CDV 61300-3-52 © IEC 2025
27 INTERNATIONAL ELECTROTECHNICAL COMMISSION
28 ____________
30 FIBRE OPTIC INTERCONNECTING
31 DEVICES AND PASSIVE COMPONENTS –
32 BASIC TEST AND MEASUREMENT PROCEDURES –
34 Part 3-52: Examinations and measurements –
35 Guide pin hole and guide pin deformation constant for angled physically
36 contacting rectangular ferrules with single-mode fibre
40 FOREWORD
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72 International Standard IEC 61300-3-52 has been prepared by subcommittee 86B: Fibre optic
73 interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
74 This second edition cancels and replaces the first edition published in 2014. This edition constitutes a
75 technical revision.
76 This edition includes the following significant technical changes with respect to the previous edition:
77 a) Inclusion of 19,6 N mating force and 0,5480 mm diameter pins, which covers 16 fibre and
78 multi-row ferrule variants.
79 b) Clarification to CDE measurement setup.
80 c) Improved definition of α parameter.
81 The text of this standard is based on the following documents:
IEC CDV 61300-3-52 © IEC 2025
FDIS Report on voting
86B/xxxx/FDIS 86
...