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है”ह”ह

IS/IEC 60793-1-52 (2001): Optical fibres, Part 1:Measurement methods and test procedures , Section 52 Changetemperature [LITD 11: Fibre Optics, Fibers, Cables, andDevices]

July 2009

ISIIEC 60793-1-52 : 2001

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Indian Standard

OPTICAL FIBRESPART 1 MEASUREMENT METHODS AND TEST PROCEDURES

Section 52 Change of Temperature

ICS 33 180 10

© BI S 2009

BUREAU OF INDIAN STANDARDSMANAK BHAVA N. 9 BA HAD UR SHAH ZAFAR MAR G

NEW DELHI 110002

Price Group 2

Fibre Optics, Fibres, Cables and Devices Sectional Committee, L1TD 11

NATIONALFOREWORD

This Indian Standard (Part 1/Sec 52) which is identical with IEC 60793-1-52 : 2001 'Optical fibres ­Part 1-52: Measurement methods and test procedures - Change of temperature' 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 andInformation Technology 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.

In this adopted standard, reference appears to the following International Standard for which Indian Standardalso exists. The corresponding Indian Standard which is to be substituted in its place is listed below alongwith Its degree of equivalence for the edition Indicated:

tnternetionet Standard

IEC 60068-2-14 : 1984 Environmenttesting - Part 2: Tests - Test N:Change of temperature

Corresponding Indian Standard

IS 9001 (Part 3) : 1978 Guidance forenvironmental testing: Part 3 Changeof temperature

Degree of Equivalence

Technically Equivalent

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

tntemetionet Standard

IEC 60793-1-32: 2001

IEC 60793-1-40: 2001

IEC 60793-2' 1998

Title

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 IEC Standard. .

For the purpose of deciding whether 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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ISIIEC 60793-1-52: 2001

Indian Standard

OPTICAL FIBRESPART 1 MEASUREMENT METHODS AND TEST PROCEDURES

Section 52 Change of Temperature

1 Scope

This part of IEC 60793 provides a practical method for evaluating fibre performance In adefined environment

The purpose of this standard is to define a test that determines the suitabihty of optical fibres(types A 1a to A 1d and 81 to 84) to withstand the environmental condition of changes In

temperature which may occur In actual use. storage and/or transport. The test is primarilyintended to permit the observation of effects of change of temperature over a given periodThis procedure is conducted In accordance with IEC 60068-2-14, test Nb

NOTE The applicability of this test to other fibre types is under study

2 Normative references

The following normative documents contain provisions which, through reference In this text.constitute provisions of this part of IEC 60793 For dated references, subsequent amendmentsto. or revisions of. any of these publications do not apply However, parties to agreementsbased on this part of IEC 60793 are encouraged to investigate the possibility of applying themost recent editions of the normative documents indicated below For undated references, thelatest edition of the normative document referred to applies. Members of IEC and ISO maintainregisters of currently valid International Standards

IEC 60068-2-14: 1984, Environmentet testing - Part 2: Tests - Test N. Change of temperature

IEC 60793-1-32' Optical fibres - Part 1-32. Measurement methods and test procedures ­Goating strippebitity

lEG 60793-1-40: Ooticet fibres - Part 1-40: Measurement methods and test procedures ­Attenuation

IEC 60793-2,1998: Optical fibres - Part 2 Product specifications

3 Apparatus

3.1 Chamber

The apparatus consists of an environmental chamber In accordance with lEG 60068-2-14,test Nb. The chamber shall be capable of housing the specimen and of allowing measurementduring conditioning It shall also be capable of maintaining the specified temperatures withinthe specified tolerances. Forced air circulation may be used to maintain homogeneousconditions The chamber and accessories shall be constructed and arranged In such a manneras to avoid condensation dripping on the specimen

Isnec 60793-1-52: 2001

3.2 Other apparatus

Additional apparatus may be necessary to perform the examinations and measurements (or asspecified in the detail specification) .

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 A1d. and at least 2 000 m for fibre types B1 to B4 .The amount of the specimen outside of the test chamber shall be minimised . and if it exceeds10 % of the overall specimen length . th is should be reported .

The preparation of the specimen shall have no detrimental effect on the fibre whilst under testcond itions . Unless otherwise specified . the fibre sample should be loosely coiled and dustedwith a material such as talcum powder . to allow the coils to move freely against each other.The specimen may be coiled horizontally or vertically . with a min imum bend diameter of150 mm to avoid any macro-bending effects . If the specimen is to be sprinkled with talc . then apiece of un -powdered fibre from the specimen shou ld be exposed to the test environment. Thispiece of fib re sha ll be o f suff ic ie nt length to enable any physical examina tions to be performedbefore an d after the tes t

A co n tro l len gt h o f the specim en shall be removed prior to the test to enable the co mpletion o frequ.reo me chanical mea su remen ts for com parison to measurements made a fte r the tes t Th iscon tro l len g th sho uld no t be spri nkl ed With talc .

5 Procedure

The spec im en IS pl aced In a cham ber and subj ec ted to changes in temperature for a spec ifieddura tion . as spe ci fied 111 the detail specitrca tron Conduct the proced ur e In accordance WithIEC 60068-2 -14. test Nb . With the fo llowmg conditions

Descript ion IEC 60068·2 ·14 nomenclature Nominal values

p f ~ ~ c o n d i til,) fll QS1 Pr e -con dmorunq 2 h at 23 C : 50 % RH

r-...11n lfll u rn ten\ ~l t:~' ratlJ r e T. -60 C (s e e no te 1 )

""axlm u m tern n er atu re / 8 +8 5 C (s e e nol e 2 \

M H1If11l H1 1 11"' e ll t ime at e ;} c ~) te m p e ra tu re t - 2 h

~' a " ln l u n l spe ed .11 ..... tll ch to \~ h a ng e lhe Ram p rare 1 C rrrunte m p e ratu r e

N um be r a t co m p let e c yc les r eu u .rec N umber a t cycl es 2

N OTE 1 In so rn e rp ~J lon ~ -.10 C m a y be accepraot e

N O TE :.> In 'SO ITh ) r tl <], :) n s · ; 0 C m ay be acce p tabl e

IS/lEe 60793-1 -52: 2001

5.1 Measurements

5.1.1 Optical measurements

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

NOTE If the cut -ba ck method (IEC 60793- 1-40 . Metho d A ) IS used . take care to tra ck th e length(s) cui over theseries of measurements . If the insertion loss meth od (Method B) IS used . the stabi li ty of the connections over timesho u ld be verified . If Method C is used . care should be take n to ensure the results agaonst measurement drrftSpectral modelling (Method OJ, IS not appli cab le

5.1.2 Mechanical measurements - Strippability

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

5.2 Conditioning

Stabilise the chamber and the specimen to standard atmospheric conditions pnor to thereference measurements be ing taken.

Adjust the chamber temperature and humidit y to the spe cified seventy The ma ximum rate ofchange of tempera tur e shall be 1 cC/min . aver aged over a maximum penoo of 5 min Allow thespecimen to reach tem pera ture stab il ity and main ta in the temperature and humid ity for theduration specified .

At the completion of the test. all ow the speci men to rem ain in the cham ber whil e thetemperature is reduced to standard atmospheric con dit ions . The max im um rate of change oftemperature shall be 1 "C/m in . averaged over a ma ximum perio d o f 5 min The detail specifi­cation may call for measurements dunng conditioning If so required. the detail spe cificationshall specify the measurements to be take n and when to take them Do not rem ove thespecimen(s) from the chamber whi ls t these measurements ar e be ing ma de.

5.3 Recovery

Unless otherwise required by the relevant specifica tion . the specimen shall rem ain understandard atmospheric condition for recovery for a period greater tha n 1 h but not more than24 h . The detail specification may call for measurements dunng recovery. If so recurred . thedetail specification shall specify the measurements to be taken and wh en to take them

6 Pass/fail criteria

The strip force and attenuat ion changes shall fulfil the requ irements as sta ted in the relevantspecification (e .g . IEC 60793 -2 ).

3

IS/lEe 60793-1-52: 2001

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

7.2 Information to be provided upon request

Description of all key equipment

Temperature cycle details

8 Specification information

The detail specification shall specify the following information

values of TA and T« used:

failure and acceptance criteria:

information to be reported.

any deviations to the procedure that apply

GMGIPN-269 BISINDI2009-JOO Copies

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Review of Indian Standards

Amendments are issued to standards as the need arises on the basi s of comme nts . Standards arealso reviewed per iodically; a standard alongwith amendments is reaffi rmed when such review ind icatesthat no changes are needed: if the rev iew indicates that changes are needed , it is tak en up for revision.Users of Indian Standards should ascertain that they are in possession of the latest amendments oredition by referring to the latest issue of 'BIS Catalogue' and 'Standards: Monthly Additions '.

This Indian Standard has been developed from Doc No.: L1TD 11 (2015) .

Amendments Issued Since Publication

Amend No. Date of Issue

BUREAU OF INDIAN STANDARDS

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