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“Invent a New India Using Knowledge”

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“Step Out From the Old to the New”

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“The Right to Information, The Right to Live”

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है”ह”ह

IS/IEC 60793-1-53 (2001): Optical fibres, Part 1:Measurement methods and test procedures , Section 53 Waterimmersion [LITD 11: Fibre Optics, Fibers, Cables, andDevices]

July 2009

IS/IEC 60793-1-53 : 2001

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Fibre Optics, Fibres, Cables and Devices Sectional Committee, LITO 11

NATIONAL FOREWORD

This Indian Standard (Part 1/Sec 53) which is identical with IEC 60793-1-53 : 2001 'Optical fibres -Part 1-53: Measurement methods and test procedures - Water immersion' issued by the InternationalElectrotechnical Commission (IEC) was adopted by the Bureau of Indian Standards on the recommendationof the Fibre Optics, Fibres, Cables and Devices Sectional Committee and approval of the Electronics andInformationTechnology Division Council.

The text of IEC Standard has been approved as suitable for publication as an Indian Standard withoutdeviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention isparticularly drawn to the following:

a) Wherever the words 'International Standard' appear referring to this standard, they should be read as'Indian Standard'.

b) Comma (,) has been used as a decimal marker, while in Indian Standards, the current practice is touse a point (.) as the decimal marker.

The technical committee responsible for the preparation of this standard has reviewed the provisions of thefollowing International Standards and has decided that they are acceptable for use in conjunction with thisstandard:

International Standard

IEC 60068-2-18: 2000

IEC 60793-1-32: 2001

IEC 60793-1-40: 2001

IEC 60793-2: 1998

Title

Environmental testing - Part 2-18: Tests - Test R and guidance: Water

Optical fibres - Part 1-32: Measurement methods and test procedures -Coating strippability

Optical fibres - Part 1-40: Measurement methods and test procedures -Attenuation

Optical fibres - Part 2: Product specification

Only the English language text in the International Standard has been retained while adopting it in this IndianStandard, and as such the page numbers are not the same as in the lEG Standard.

For the purpose of deCidingwhether a particular requirement of this standard is complied with the final value,observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance withIS 2: 1960 'Rules for rounding off numerical values (revised)'. The number of significant places retained inthe rounded off value should be the same as that of the specified value in this standard.

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Indian Standard

OPTICAL FIBRESPART 1 MEASUREMENT METHODS AND TEST PROCEDURES

Section 53 Water Immersion

1 Scope

This pa rt of lEG 60793 provides a pract ical method for evaluating fibre performance In adefined environment.

The purpose of this standard is to define a test that determines the suitability of optical fibre(types A 1a to A 1d and 81 to 84) to withstand the environmental condit ion of rmmersron Indist illed or demineral ized water whi ch may occur In actual use . storage and /or trans port Th etest is pr imarily intended to permit the observation of effects of rrnmersron In water over a gi venperiod . Th is procedure is conducted In accorda nce with lEG 60068-2 -18 . te st Rc

NOT E The app li c ab il it y of t rus te s t to ot her fib re t ype s IS und e r stud y

2 Normative references

The following normative documents contain provisions which . through reference In thi s text.constitute provisions of this part of lEG 60793 For dated references . subsequent am endmentsto . or rev isions of. an y of these publ ications do not appl y. However . parties to agreementsbased on this part of lEG 60793 are encouraged to invest igate the possibil ity of applying themost recent ed itions of the normative documents Indicated below For undated refer enc es. thelatest ed ition of the normative document referred to applies . Members of lEG and ISO maintainregisters of currently valid International Standards .

lEG 60068-2 -18 . En vironmental test ing - Part 2-1: Tests - Test R and quidence Wat er

lEG 60793-1-32. Optical fibres - Part 1-32: Measurement methods and test proceduresCoating strippability

IEC 60793-1-40. Optical tibres - Part 1-40: Measurement methods and test proced ure s _.Attenuation

lEG 60793-2 . Optical iib res - Part 2. Product specifications

3 Apparatus

3.1 Water tank

The apparatus consists of a water tank fi lled with water . Use distilled . dermnera trsec or de-ioni sed water which has a pH of between 5.0 and 8 .0 .

3.2 Other apparatus

Addit iona l appara tus may be nece ssa ry to perform the exam inations and measurements (or asspec if ied in the deta il specificat ion ).

ISIIEC 80793-1-53: 2001

4 Sampling and specimens

To ensure the required repeatability on optical measurements. the length of the specimen shallbe at least 1 000 m for fibre types A1a to A 1d. and at least 2 000 m for fibre types 61 to 64 .The amount of the specimen outside of the tank shall be minimized. and if it exceeds 10 % ofthe overall specimen length. this should be reported .

The preparation of the specimen shall have no detrimental effect on the fibre whilst under testconditions . Unless otherwise specified , the fibre sample should be loosely co iled and the fibreends kept out of the water. The spec imen may be coiled horizontally or vertically. with aminimum bend diameter of 150 mm to avo id any macro-bending effects . This piece of fibreshall be of sufficient length to enable any physical examinations to be performed before andafter the test .

A control length of the specimen shall be removed prior to the test to enable the completion ofrequired mechanical measurements for comparison to measurements made after the test .

5 Procedure

The specimen is placed in a tank which is filled with water held at 23 C ± 5 C. and held therefor 30 days . The attenuation and coating strip force of the specimen are then monitored .Conduct the procedure in accordance with IEC 60068-2-18, test Rc, with the "head of water"being not applicable (the head of water is used to test for "water tightness" of electrotechnicalproducts , but it is not requ ired in this application) .

5.1 Measurements

5.1.1 Optical measurements

Attenuation measurement shall be carried out at the wavelength specified in the relevantspecificat ion using IEC 60793-1-40. before . during (once the specimen has stabilised at thespecified temperature and relative humid ity) and after the test. Attenuation changes shall berecorded .

NOTE If the cut -back method (IEC 60793· 1·40 . Method A) is used . take care to track the length (s) cut over theseries of measurements If the Insertion loss method (Method B) is used . the stability of the connections over timeshould be verified . If Method C IS used . care should be taken to ensure the results against measurement drift.Spectral modelling (Method OJ, IS not appucabte

5.1.2 Mechanical measurements

The fibre coating strip force shall be measured before and after the test. us ing the methoddescribed in IEC 60793-1 -32. The control specimen (see clause 4) is used to evaluate thechange in strippability .

5.2 Preconditioning

If specified . precond ition the specimen as required by the detail specification .

5.3 Condition ing

Not applicable

2

I8nEC 60793-1-53: 2001

5.4 Recovery

Unless otherwise required by the relevant specif icat ion , the specimen shall remain understandard atmospheric condition for recovery for a period greater than 12 h but not more than48 h. The detail specification may call for measurements during recovery. If so required, thedetail specification shall specify the measurements to be taken and when to take them .

6 Pass/fail criteria

The strip force and attenuation changes shall fulfil the requirements as stated in the relevantspecification (e .g. IEC 60793-2) .

7 Results

7.1 Information to be provided with each test

Date and title of test

Identification of specimen

- Length of specimen

Nominal wavelength(s) at which the test was performed

- Attenuation change

Coating strip force

Initial pH of the water

7.2 Information to be provided upon request

Description of all key equ ipment

8 Specification information

The detail specification shall specify the following information :

- fa ilure and acceptance cr iteria ;

information to be reported ;

any deviations to the procedure that apply.

3

Bureau of Indian Standards

SIS IS a statutory Ins titution established under the Bureau of Indian Standards Act . 1986 to promoteharmonious development of the activities of standard ization. marking and quality cert ific atio n ofgoods and attending to connected mailers In the country.

Copyright

SIS has the copyright of all Its pub licat ions. No part of the these publications may be reproduced inany form without the prior permission in Writing of SIS . Th is does not preclude the free use , in thecourse of implementing the standard, of necessary details . such as symbols and sizes . type or gradedes ignations . Enquiries relat ing to copyright be addressed to the Director (Publications), SIS .

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments . Standards arealso reviewed periodically; a standard alongwith amendments is reaffirmed when such review indicatesthat no changes are needed; if the review indicates that changes are needed, it is taken up for rev is ion.Users of Indian Standards should ascertain that they are in possession of the latest amendments oredition by referring to the latest issue of 'SIS Catalogue' and 'Standards: Monthly Additions'.

This Indian Standard has been developed from Doc No.: LITO 11 (2016) .

Amendments Issued Since Publication

Amend No. Date of Issue

SUREAU OF INDIAN STANDARDS

Text Affected

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