IEC 61300-3-54:2019

IEC 61300-3-54 ®
Edition 1.0 2019-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures –
Part 3-54: Examinations and measurements – Angular misalignment between
ferrule bore axis and ferrule axis for cylindrical ferrules

Dispositifs d'interconnexion et composants passifs fibroniques – Procédures
fondamentales d'essais et de mesures –
Partie 3-54: Examens et mesures – Erreur d'alignement angulaire entre l'axe de
l'alésage de férule et l'axe de férule pour les férules cylindriques

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IEC 61300-3-54 ®
Edition 1.0 2019-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures –
Part 3-54: Examinations and measurements – Angular misalignment between

ferrule bore axis and ferrule axis for cylindrical ferrules

Dispositifs d'interconnexion et composants passifs fibroniques – Procédures

fondamentales d'essais et de mesures –

Partie 3-54: Examens et mesures – Erreur d'alignement angulaire entre l'axe de

l'alésage de férule et l'axe de férule pour les férules cylindriques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.10 ISBN 978-2-8322-7099-8

– 2 – IEC 61300-3-54:2019  IEC 2019
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General description . 6
5 Apparatus . 6
5.1 General . 6
5.2 Pin gauge . 6
5.3 Ferrule holder . 7
5.4 Microscope with video camera . 7
5.5 Precision alignment stage . 7
5.6 Display . 7
5.7 Computer . 7
6 Procedure . 7
7 Details to be specified . 8
Annex A (informative) Measurement uncertainty . 9
A.1 General . 9
A.2 Precision alignment stage accuracy . 9
A.3 Misalignment between ferrule holder axis and camera axis . 10
A.4 Image plane resolution per pixel . 10
A.5 Ferrule bore eccentricity . 11
A.6 Clearance between ferrule bore diameter and gauge diameter . 11
A.7 Summary of measurement uncertainty . 12
Bibliography . 13

Figure 1 – Angular misalignment between ferrule bore axis and ferrule outside
diameter datum axis. 6
Figure 2 – Example of test apparatus . 6
Figure A.1 – Diagram of error caused by the precision alignment stage accuracy . 9
Figure A.2 – Diagram of error caused by the misalignment between the ferrule holder
axis and the camera axis . 10
Figure A.3 – Diagram of error caused by the image plane resolution per pixel . 11
Figure A.4 – Diagram of error caused by the ferrule bore eccentricity . 11
Figure A.5 – Diagram of error caused by the clearance between the ferrule bore
diameter and the pin gauge diameter . 12

Table A.1 – Example of measurement uncertainty summary . 12

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

Part 3-54: Examinations and measurements –
Angular misalignment between ferrule bore axis
and ferrule axis for cylindrical ferrules

FOREWORD
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rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61300-3-54 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/4203/FDIS 86B/4215/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.

– 4 – IEC 61300-3-54:2019  IEC 2019
A list of all parts in the IEC 61300 series, published 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 3-54: Examinations and measurements –
Angular misalignment between ferrule bore axis
and ferrule axis for cylindrical ferrules

1 Scope
This part of IEC 61300 describes the procedure to measure the angular misalignment between
the ferrule bore axis and the outside diameter datum axis of a cylindrical ferrule.
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.
ISO 1938-1, Geometrical product specifications (GPS) – Dimensional measuring equipment –
Part 1: Plain limit gauges of linear size
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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 platform: available at http://www.iso.org/obp
3.1
angular misalignment
angle θ between the ferrule outside diameter datum and the ferrule bore axis
Note 1 to entry: The angular misalignment is measured in degrees.
Note 2 to entry: See Figure 1.

– 6 – IEC 61300-3-54:2019  IEC 2019

Figure 1 – Angular misalignment between ferrule bore axis and ferrule
outside diameter datum axis
3.2
ferrule bore axis
centre axis of the largest cylinder inscribed within the ferrule bore
4 General description
This procedure describes the measurement of the angular misalignment between the ferrule
bore axis and the outside diameter datum axis of a cylindrical ferrule.
This procedure measures the angular misalignment θ by measuring the tip image deviation of
a pin gauge fitted into the ferrule bore as the ferrule is rotated around its axis.
5 Apparatus
5.1 General
The apparatus shown in Figure 2 consists of the items described in 5.2 to 5.7. Alternative
apparatus may be used if it does not have a negative impact on the measurement uncertainty.
The most significant terms in the uncertainty budget are described in Annex A.

Figure 2 – Example of test apparatus
5.2 Pin gauge
The pin gauge outer diameter shall closely match the bore diameter of the ferrule under test.
The pin gauge shall be in accordance with ISO 1938-1.

5.3 Ferrule holder
The ferrule holder shall have a precise V-groove or other outer diameter (OD) reference
mechanism so that the ferrule is placed and rotated around its axis. ISO 2538-1 recommends
an optimal angle of 108° for the V-groove.
5.4 Microscope with video camera
The microscope shall include a video camera so that the spatial location of the tip of the pin
gauge can be measured when the ferrule is rotated in the ferrule holder about its outside
diameter datum axis. The video camera and microscope optical axis shall be parallel to the axis
of the V-groove or OD reference mechanism to within 0,01°. Recommended video image plane
resolution is less than 0,3 µm per pixel.
5.5 Precision alignment stage
The precision alignment stage shall have enough adjustment accuracy to measure the
protrusion (L in Figure 2) of the pin gauge from the ferrule endface. Recommended adjustment
accuracy is less than 0,01 mm.
5.6 Display
The display shall show the image from the video camera so that the spatial position of the pin
gauge can be measured while the ferrule is rotated about its outside diameter datum axis.
5.7 Computer
The computer shall utilize image measurement software that can measure the centre of the pin
gauge tip image and calculate a virtual circle by the least square method from multiple
measurement points.
6 Procedure
The procedure consists of the following steps.
a) Insert the pin gauge into the bore of the ferrule under test so that the pin gauge protrudes
from the ferrule endface. The pin gauge should engage a minimum of 3 mm of the ferrule
bore region closest to the ferrule end face. The pin gauge should protrude from the end face
by at least 5 mm (L in Figure 2).
b) Place the ferrule into the ferrule holder.
c) Measure the protrusion (L in Figure 2) of the pin gauge by successively focusing the optical
system on the ferrule endface and pin gauge endface and noting the distance (L) between
the two planes of focus using the precision alignment stage.
d) The ferrule shall be rotated in steps of 60° or less, until a complete rotation is made.
e) Measure each tip image centre position using the computer imaging software as detailed in
5.7.
To minimize thermal-induced drift, it is recommended all measurements should be made
consecutively in a short amount of time (less than one minute).
f) Use the computer and associated software to calculate the diameter (A) of the virtual circle
shown in Figure 2.
θ) between the ferrule bore axis and the ferrule outside diameter
g) The angular misalignment (
datum axis is given by Formula (1):

– 8 – IEC 61300-3-54:2019  IEC 2019
A
θ= arctan (1)

2L

where
L is the protrusion of the pin gauge;
A is the maximum tip image deviation of the pin gauge.
7 Details to be specified
The following details, as applicable, shall be specified in the detail specification:
a) specification and required accuracy of the apparatus;
b) allowable angular misalignment;
c) dimensions of the pin gauge used (length, outer diameter);
d) ferrule bore diameter;
e) protrusion of the pin gauge from the ferrule endface;
f) magnification of the microscope;
g) image plane resolution per pixel;
h) accuracy of the precision alignment stage;
i) deviation from the test procedure;
j) measurement uncertainty of the procedure.

Annex A
(informative)
Measurement uncertainty
A.1 General
The measurement uncertainty is considered to be mainly caused by the items described in
Clauses A.2 to A.6.
A.2 Precision alignment stage accuracy
The error caused by the precision alignment stage accuracy is shown in Figure A.1.

Key
L pin gauge protrusion
θ angle between the ferrule outside diameter datum axis and the ferrule bore axis
Δd precision alignment stage accuracy
ΔA deviation of virtual circle image caused by precision alignment stage accuracy
Figure A.1 – Diagram of error caused by the precision alignment stage accuracy
The measurement error Δθ associated with Δd can be calculated by Formulae (A.1) and (A.2).
2ΔΔA A
  
Δθ arctan arctan (A.1)
  
2LL
  
ΔΔA sinθ× L+ d− sinθL×= sinθ× Δd (A.2)
( ) ( )
The measurement error caused by the precision alignment accuracy is given by Formula (A.3):

sinθd×(Δ )
∴=Δθ arctan (A.3)


L

=
==
– 10 – IEC 61300-3-54:2019  IEC 2019
A.3 Misalignment between ferrule holder axis and camera axis
The error caused by the misalignment between the ferrule holder axis and the camera axis is
shown in Figure A.2.
Key
L pin gauge protrusion
θ angle between the ferrule outside diameter datum axis and the ferrule bore axis
ϕ misalignment between the ferrule holder axis and the camera axis
∆A deviation of virtual circle image by the misalignment between the ferrule holder axis and the camera axis
Figure A.2 – Diagram of error caused by the misalignment between
the ferrule holder axis and the camera axis
The measurement error Δθ associated with ϕ can be calculated by Formulae (A.4) and (A.5).
 2ΔΔA A
Δθ arctan arctan
(A.4)
  
2LL
  
2L×sinθφ×−(1 cos )
A−×A cosφ
ΔAL= = =×sinθφ×−1 cos (A.5)
( )
The measurement error caused by the misalignment between the ferrule holder axis and the
camera axis is given by Formula (A.6):
 
L×sinθ×−(1 cosφ)
∴Δθθarctan arctansin×−1 cosφ  (A.6)
( )
 
 
L
 
 
A.4 Image plane resolution per pixel
The diagram of maximum error caused by the image plane resolution per pixel is shown in
Figure A.3.
= =
==
Key
∆R image plane resolution per pixel
Figure A.3 – Diagram of error caused by the image plane resolution per pixel
The measurement error caused by the image plane resolution per pixel is given by
Formula (A.7):
2ΔΔR R
   
Δθ arctan arctan (A.7)
   
2LL
   
A.5 Ferrule bore eccentricity
The diagram of error due to the ferrule bore eccentricity is shown in Figure A.4.

Key
L pin gauge protrusion
∆F ferrule bore eccentricity
Figure A.4 – Diagram of error caused by the ferrule bore eccentricity
The measurement error caused by the ferrule bore eccentricity is given by Formula (A.8):
2ΔΔF F
  
Δθ arctan arctan (A.8)
  
2LL
  
A.6 Clearance between ferrule bore diameter and gauge diameter
The diagram of error due to the clearance between the ferrule bore diameter and the pin gauge
diameter is shown in Figure A.5.
==
==
– 12 – IEC 61300-3-54:2019  IEC 2019

Key
L pin gauge protrusion
∆C clearance between ferrule bore diameter and gauge diameter
Figure A.5 – Diagram of error caused by the clearance between
the ferrule bore diameter and the pin gauge diameter
The measurement error caused by t
...