prEN IEC 60068-2-1:2024
(Main)Environmental testing - Part 2-1: Tests - Test a: Cold
Environmental testing - Part 2-1: Tests - Test a: Cold
Umgebungseinflüsse - Teil 2-1: Prüfverfahren - Prüfung A: Kälte
Essais d'environnement - Partie 2-1: Essais - Essai a: Froid
Okoljski preskusi - 2-1. del: Preskusi - Preskusi a: Mraz
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-2024
Okoljski preskusi - 2-1. del: Preskusi - Preskusi a: Mraz
Environmental testing - Part 2-1: Tests - Test a: Cold
Umgebungseinflüsse - Teil 2-1: Prüfverfahren - Prüfung A: Kälte
Essais d'environnement - Partie 2-1: Essais - Essai a: Froid
Ta slovenski standard je istoveten z: prEN IEC 60068-2-1:2024
ICS:
19.040 Preskušanje v zvezi z Environmental testing
okoljem
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
104/1046/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60068-2-1 ED7
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2024-04-19 2024-07-12
SUPERSEDES DOCUMENTS:
104/1020/CD, 104/1037A/CC
IEC TC 104 : ENVIRONMENTAL CONDITIONS, CLASSIFICATION AND METHODS OF TEST
SECRETARIAT: SECRETARY:
Sweden Mr Henrik Lagerström
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
Other TC/SCs are requested to indicate their interest, if
any, in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
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CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
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Countries” clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is
the final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).
TITLE:
Environmental testing - Part 2-1: Tests - Test A: Cold
PROPOSED STABILITY DATE: 2031
NOTE FROM TC/SC OFFICERS:
download this electronic file, to make a copy and to print out the content for the sole purpose of preparing National
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IEC CDV 60068-2-1 © IEC 2024 2 104/1046/CDV
1 CONTENTS
2 FOREWORD . 4
3 INTRODUCTION . 6
4 1 Scope . 7
5 2 Normative references . 7
6 3 Terms and definitions . 7
7 4 Symbols . 8
8 5 Application of tests for non-heat-dissipating specimens versus tests for heat-
9 dissipating specimens . 8
10 5.1 General . 8
11 5.2 Ascertaining high or low air velocity in the test chamber . 9
12 5.3 Temperature monitoring . 10
13 5.4 Packaging . 10
14 5.5 Background . 11
15 6 Test description . 11
16 6.1 General . 11
17 6.2 Severities . 12
18 6.2.1 General . 12
19 6.2.2 Low conditioning temperature T . 12
A
20 6.2.3 Exposure time t . 12
21 6.3 Test Ab: Cold for non-heat-dissipating specimens . 12
22 6.4 Test Ad: Cold for heat-dissipating specimens that are energized after initial
23 temperature stabilization . 14
24 6.5 Test Ae: Cold for heat-dissipating specimens that are energized throughout
25 the test . 14
26 7 Testing procedure . 15
27 7.1 General . 15
28 7.2 Thermal radiation . 16
29 7.3 Specimen with artificial cooling or heating . 16
30 7.4 Mounting . 16
31 7.5 Preconditioning . 16
32 7.6 Initial measurements . 16
33 7.7 Conditioning . 16
34 7.8 Intermediate measurements . 17
35 7.9 Final temperature ramp . 17
36 7.10 Recovery . 17
37 7.11 Final measurements . 17
38 8 Information to be given in the relevant specification . 17
39 9 Information to be given in the test report . 18
40 Annex A (informative) Relationship of suffixes between Test A: Cold and Test B: Dry
41 heat . 20
42 Annex B (normative) Nomogram for the correction of the conditioning temperature . 21
43 B.1 Introduction . 21
44 B.2 Determination of the corrected low conditioning temperature T . 21
A’
45 B.2.1 General . 21
46 B.2.2 Application of the graphical solution method . 21
47 B.2.3 Application of the numerical solution method . 24
IEC CDV 60068-2-1 © IEC 2024 3 104/1046/CDV
48 B.2.4 Further adjustment of the corrected low conditioning temperature T . 25
A’
49 B.3 Exemplary application of the nomogram . 26
50 B.3.1 Exemplary test setup and specimen . 26
51 B.3.2 Graphical solution method . 26
52 B.3.3 Numerical solution method . 29
53 Annex C (informative) Advantages and disadvantages of available test procedures for
54 heat-dissipating specimens . 30
55 Bibliography . 31
57 Figure 1 – Examples of temperature profiles of energized heat-dissipating specimens
58 in test chambers with high air velocity (a) and low air velocity (b) . 10
59 Figure 2 – Block diagram of the test procedures and applicable selection criteria of
60 Test A: Cold . 11
61 Figure 3 – Test Ab: Cold for non-heat-dissipating and non-operating specimens . 13
62 Figure 4 – Test Ab: Cold for non-heat-dissipating, operating specimens . 13
63 Figure 5 – Test Ad: Cold for heat-dissipating specimens that are energized after initial
64 temperature stabilization . 14
65 Figure 6 – Test Ae: Cold for heat-dissipating specimens that are required to be
66 energized throughout the test . 15
67 Figure B.1 – Nomogram to determine the corrected conditioning temperature . 23
68 Figure B.2 – Test Ad (a) and Test Ae (b) with the corrected conditioning temperature
69 T 24
A’
70 Figure B.3 – Test Ad (a) and Test Ae (b) with the corrected conditioning temperature
71 T and a second temperature adjustment . 25
A’
72 Figure B.4 – Test Ad (a) and Test Ae (b) with a preliminary temperature above the
73 corrected conditioning temperature T and a second temperature adjustment . 26
A’
74 Figure B.5 – Nomogram with exemplary application of the procedure . 28
76 Table 1 – Preferred values for the low conditioning temperature T . 12
A
77 Table 2 – Preferred values for the exposure time t . 12
78 Table A.1 – Relationship of suffixes between Test A: Cold, and Test B: Dry heat . 20
IEC CDV 60068-2-1 © IEC 2024 4 104/1046/CDV
81 INTERNATIONAL ELECTROTECHNICAL COMMISSION
82 ______________
84 ENVIRONMENTAL TESTING –
86 Part 2-1: Tests – Test A: Cold
89 FOREWORD
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