Iec 60068-2-39-2015.Pdf

IEC 60068 2 39 Edition 2 0 201 5 09 INTERNATIONAL STANDARD NORME INTERNATIONALE Environmental testing – Part 2 39 Tests – Tests and guidance Combined temperature or temperature and humidity with low a[.]

Environment al t est ing –

Part 2- 39: T est s – Test s and guidance: Combined t emperat ure or t emperat ure

and humidity wit h low air pressure t ests

Part ie 2- 39: Essais – Essais et l gnes direct rices: Essais combinés de

t empérat ure ou de t empérat ure et d’humidit é à basse pression at mosphérique

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Environment al t est ing –

Part 2- 39: T est s – Test s and guidance: Combined t emperat ure or t emperat ure

and humidity wit h low air pressure t ests

Part ie 2- 39: Essais – Essais et l gnes direct rices: Essais combinés de

t empérat ure ou de t empérat ure et d’humidit é à basse pression at mosphérique

INT ERNAT IONAL

ELECT ROT ECHNICAL

ELECT ROT ECHNIQUE

INT ERNAT IONALE

®

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FOREWORD 3

INTRODUCTION 5

1 Sco e an o ject 6

2 Normative ref eren es 6

3 Terms an def i ition 6

4 Testin 6

4.1 General 6

4.2 Pref er ed combination 6

4.3 Initial me s rement and f un tional p r orman e test 7

4.4 Test proced re 7

4.4.1 Precon itionin

7 4.4.2 Test with temp rature an low air pres ure 7

4.4.3 Test with temp rature, h midity an low air pres ure 9

5 Final me s rements 12 6 Inf ormation to b given in the relevant sp cif i ation 1

2 7 Inf ormation to b given in the test re ort 12 An ex A (informative) Guidan e on combined temp rature or temp rature an h midity with low air pres ure testin 14 A.1 General 14 A.2 En ironmental eff ects 14 A 3 Me s rement of temp rature 1

4 Biblogra h 16 Fig re 1 – Example of test seq en e with cold temp rature an low air pres ure 8

Fig re 2 – Example of test seq en e with dry he t an low air pres ure 9

Fig re 3 – Example of test seq en e of temp rature an h midity with low air pres ure 1

Ta le 1 – Test severities 7

INTERNATIONAL ELECTROTECHNICAL COMMISSION

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th later

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Pu lc tio s

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p te t rig ts IEC s al n t b h ld re p n ible f or id ntif yin a y or al s c p te t rig ts

International Stan ard IEC 6 0 8-2-3 has b en pre ared by IEC tec nical commite 10 :

En ironmental con ition , clas ification an method of test

This secon edition can els an re laces the first edition publ s ed in 19 6 an con titutes a

tec nical revision

This edition in lu es the fol owin sig ificant tec nical c an es with resp ct to the previou

edition:

a) prefer ed severities of the IEC 6 0 8 series;

b) combined temp rature, h midity an low air pres ure

The text of this stan ard is b sed on the fol owin doc ments:

Ful inf ormation on the votin for the a proval of this stan ard can b f oun in the re ort on

votin in icated in the a ove ta le

This publ cation has b en draf ted in ac ordan e with the ISO/IEC Directives, Part 2

A l st of al p rts in the IEC 6 0 8 series, publ s ed u der the general title Enviro me t al

testin , can b fou d on the IEC we site

The commit e has decided that the contents of this publ cation wi remain u c an ed u ti

the sta i ty date in icated on the IEC we site u der "ht p:/we store.iec.c " in the data

related to the sp cif i publ cation At this date, the publ cation wi b

• recon rmed,

• with rawn,

• re laced by a revised edition, or

• amen ed

Eq ipment an comp nents are req ired to fu ction without sig if i ant red ction in

p rorman e when s bjected to diff erent en ironmental p rameters The combination of

temp rature, h midity an low air pres ure may have certain eff ects on comp nents an

gas ets, for example

The typ an severity of the en ironmental p rameters de en on the o erational, tran p rt

an storage en ironments to whic the eq ipment an comp nents are s bjected The

en ironmental ef fects on the p r orman e of eq ipment in the tro ic an s btro ic are

total y dif ferent f rom those in arctic region In ivid al en ironmental p rameters cau e a

variety of diff erent an overla pin ef fects on the eq ipment an comp nents

The man facturer atempts to en ure, an the u er exp cts, that eq ipment an comp nents

wi s rvive the en ironments to whic they wi b s bjected throu hout their u eful l fe This

exp ctation can b as es ed by exp s re of the sp cimen to a ran e of simulated

en ironmental p rameters control ed in the la oratory The severity of the en ironmental

p rameters is of ten in re sed to o tain me nin f ul res lts in a relatively s ort p riod of time

This alows as es ment of the l kely ef fects of a pl ed en ironmental con ition

ENVIRONMENTA L TESTING –

Part 2-39: Tests –

Tests and guidance: Combined temperature or

temperature and humidity with low air pressure tests

This p rt of IEC 6 0 8 provides a des ription of test method an g idan e f or testin of

eq ipment or comp nents u der combined temp rature or temp rature an h midity with low

air pres ure tests

The object of combined testin is to in estigate to what extent the eq ipment or comp nents

are af fected by combined temp rature or temp rature an h midity with low air pres ure tests

The method of combined tests detects electrical, mec anical or other ph sical variation

The f ol owin doc ments, in whole or in p rt, are normatively ref eren ed in this doc ment an

are in isp n a le f or its a pl cation For dated ref eren es, only the edition cited a ples For

u dated referen es, the latest edition of the referen ed doc ment (in lu in an

amen ments) a pl es

IEC 6 0 8-1, Enviro me tal testin – P art 1: Ge eral a d g id an e

IEC 6 0 8-2-7 , Enviro me tal testin – P art 2-78: Tests – Test Ca : Damp h at, ste dy

Al values of test p rameters s c as cold, dry he t, low air pres ure, h midity, exp s re time

an con ition s c as state of o eration an so on, s ould b selected fom the IEC 6 0 8-2

series or the relevant sp cif i ation

The d ration of exp s re s al b me s red f om the time when temp rature sta i ty of the

sp cimen has b en re c ed u der con ition of low air pres ure Temp rature sta i ty s al

b ac ordin to IEC 6 0 8-1

It s ould pref era ly b tested with low air velocity

4.2 Prefer e combination

Prefer ed combination of temp rature, low air pres ure an d ration s al b selected fom

Ta le 1

The relevant sp cification may req ire precon itionin of sp cimen.

4.4.2 Te t with temperature a d low air pre s re

Fig re 1 an Fig re 2 s ow examples of test seq en e with temp rature an low air pres ure

The sp cimen s al b introd ced in the c amb r as req ired (u p c ed, switc ed on or of,

etc.)

The temp rature within the c amb r s al b adju ted to the req ired temp rature as

determined in 4.1 The rate of temp rature c an e s ould not ex e d 1 K/min The sp cimen

s al b al owed to re c temp rature sta i ty

In the case of electrical y-o erated sp cimen , a fu ction c ec s al b made in ac ordan e

with the relevant sp cif i ation Intermediate me s rements s al b p rf ormed as req ired or

sp cified in the relevant sp cification

The pres ure in the c amb r s al then b red ced to the req ired value as determined in 4.1

The rate of c an e of pres ure s ould not ex e d 15 kPa/min

The con ition of temp rature an low air pres ure s al b maintained for the req ired

d ration as determined in 4.1

The low air pres ure s al then b restored to normal pres ure, at a rate not ex e din

15 kPa/min Durin the in re se of pres ure, the temp rature do s not ne d to b control ed

The sp cimen remain within the c amb r u ti the temp rature re c es stan ard

atmospheric con ition The rate of temp rature c an e s ould not ex e d 1 K/min

The sp cimen s al then b s bjected to the recovery proced re as req ired

7t

8

t

9

4.4.3 Te t with temperature, humidity a d low air pre s re

Fig re 3 s ows an example of test seq en e of temp rature an h midity with low air

pres ure

The sp cimen s al b introd ced in the c amb r as req ired (u p c ed, switc ed on or of,

etc.)

The temp rature within the c amb r s al b adju ted to the req ired temp rature as

determined in 4.1 The rate of temp rature c an e s ould not ex e d 1 K/min The sp cimen

s al b al owed to re c temp rature sta i ty

A f un tional test s al b car ied out in ac ordan e with the relevant sp cification

Intermediate me s rements s al b p rf ormed as req ired or sp cified in the relevant

sp cification

With the temp rature sti maintained at the req ired value as determined in 4.1, the air

pres ure in the c amb r s al then b red ced to the req ired value as determined in 4.1 The

rate of c an e of pres ure s ould not ex e d 15 kPa/min

7t

8

t

9

The con ition of temp rature an low air pres ure s al b maintained for the req ired

d ration as determined in 4.1

Water va our s al then b injected at a rate s ff i ient to cau e f ost to f orm on the sp cimen

After that, the temp rature s al b raised to la oratory temp rature, whi e the low air

pres ure is con tant

When the risin temp rature has re c ed a value b twe n 0 °C an 5 °C, the low air pres ure

s al b restored to normal pres ure with a rate not ex e din 15 kPa/min Durin the

in rease of pres ure, the temp rature do s not ne d to b controled The temp rature an

h midity s al b sta i zed at the req ired values; refer to the relevant sp cif i ation or

IEC 6 0 8-2-7 The con ition of temp rature an h midity s al b maintained f or the

req ired d ration as determined in 4.1

The sp cimen s al then b s bjected to the recovery proced re as req ired

rh relativ h midity re uire

rh relativ h midity u c ntrole

7t

5 Final measureme ts

The sp cimen s al b s bmit ed to the vis al, dimen ional an fu ctional c ec s pres rib d

by the relevant sp cification

The relevant sp cification s al provide the criteria up n whic the ac e tan e or rejection of

the sp cimen is to b b sed

6 Inf ormation to be give in the releva t specif ication

The relevant sp cification s al contain the folowin detai s as far as they are a pl ca le:

a) d ration of exp s re;

b) temp rature for low air pres ure;

c) value of low air pres ure;

d) value of temp rature for h midity;

l) criteria f or evaluation;

m) typ an s o e of test re ort

7 Inf ormation to be give in the test report

As a minimum, the test re ort s al s ow the fol owin information:

ac reditation – if an )

d) Typ of test proc ed re (e.g temp rature, h midity an low air

pres ure)

h) Relevant la oratory test proced re (code an is ue)

i) Test sp cimen des ription (drawin , photo, q antity, bui d statu , etc.)

k) Per orman e of test a p ratu (set p int temp rature control, air flow etc.)

l) Air velocity an direction (air velocity an direction of in ident air to the

sp cimen)

m) Un ertainties of me s rement s stem (u certainties data, in lu in temp rature

sta i ty of tran d cer sen itivities)

n) Cal bration data (last an next d e date)

o) Initial, intermediate an final

me s rements

(initial, intermediate an f i al me s rements)

r) Perf orman e of test sp cimen (res lts of f un tional tests etc.)

s) Observation d rin testin an

action taken

(an p rtinent o servation )

NOT Te t in bra k ts s rv s a e pla atio s

An ex A furnis es fu damental comments for a plyin combined tests of temp rature or

temp rature an h midity an low air pres ure b sed on dif ferent p rts within the

IEC 6 0 8-2 series

For the purp ses of combined testin , IEC 6 0 8-1 s al b u ed together with the relevant

prefer ed values des rib d in the IEC 6 0 8-2 series

A 2 Environmental ef f ects

A.2.1 The f ol owin ef fects on the sp cimen are con idered to b d e to the combination of

temp rature an low air pres ure:

a) In rease of s race temp rature an c an es of temp rature gradients of he t dis ip tin

sp cimen in comp rison with the sp cified values are due to the decre se of the

con ection co ff i ient, at low air pres ure Althou h the in re se of s race temp ratures

can b ac ieved by u in a hig er test temp rature at normal air pres ure, this test

temp rature value can ot b pro erly esta l s ed an the cor ect temp rature gradients

can ot b ac ieved without combinin with low air pres ure

b) Chan es in f un tional or safety c aracteristic of sp cimen d e to c an es with low air

pres ure an temp rature of dielectric pro erties of air At low air pres ure, p rtic larly

when combined with hig temp rature, there is a marked red ction of air dielectric

stren th with the con eq ent in re sed ris of arc, s race or corona dis harges

c) Chan es in material c aracteristic d e to cold or he t in re se the ris that se led

eq ipment or comp nent wi b def ormed or crac ed at low air pres ure

A.2.2 Other eff ects due es ential y to temp rature but remarka ly ac elerated by low air

pres ure are:

a) volati zation of plasticizers an of degradation prod cts f rom plastic , with c an es in the

mec anical an electrical c aracteristic of in ivid al p rts of the sp cimen These

eva orated prod cts can con en e on ne rby s r aces an /or prod ce c an es of

c aracteristic , cor osion an /or degradation,

b) eva oration of lubricants with p s ible bloc in of movin parts, an

c) dis olved gas evolution fom l q id ; the red ced low air pres ure can res lt in tran itory

b i n , with a p s ible le kage of l q id

A 3 Me surement of temperature

The eff i ien y of thermal ex han e b twe n test atmosphere an sen in elements of the

thermometer u ed f or air temp rature monitorin is red ced by the con ection co ff i ient

decre se as ociated with low air pres ure

To ad res these con eq en es, a s ield may b placed b twe n the thermometer an

the sp cimen to red ce the ef fect of the he t radiation To comp n ate f or the resp n e

time of thermometer a lon er me s rement time may b required

Bibl ogr aphy

IEC 6 0 8-2 (al p rts), Enviro me tal testing – P art 2: Tests

IEC 6 0 8-2-1, Enviro me t al testin – P art 2-1: Tests – Test A: Cold

IEC 6 0 8-2-2, Enviro me tal testing – P art 2-2: Tests – Test B: Dry h at

IEC 6 0 8-2-13, Basic e viro me tal test in pro ed ures – P art 2-13: Tests – Test M: L w air

pres ure

IEC 6 0 8-3-1, Enviro me tal testing – P art 3-1: Su p rtin do ume t at io a d g ida c –

Cold a d d ry h at tests

_ _ _ _ _ _