prEN IEC 60068-2-2:2024
(Main)Environmental testing - Part 2-2: Tests - Test b: Dry heat
Environmental testing - Part 2-2: Tests - Test b: Dry heat
Umgebungseinflüsse - Teil 2-2: Prüfverfahren - Prüfung B: Trockene Wärme
Essais d'environnement - Partie 2-2: Essais - Essai b: Chaleur sèche
Okoljsko preskušanje - 2-2. del: Preskusi - Preskusi b: Suha vročina
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-2024
Okoljsko preskušanje - 2-2. del: Preskusi - Preskusi b: Suha vročina
Environmental testing - Part 2-2: Tests - Test b: Dry heat
Umgebungseinflüsse - Teil 2-2: Prüfverfahren - Prüfung B: Trockene Wärme
Essais d'environnement - Partie 2-2: Essais - Essai b: Chaleur sèche
Ta slovenski standard je istoveten z: prEN IEC 60068-2-2:2024
ICS:
19.040 Preskušanje v zvezi z Environmental testing
okoljem
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
104/1047/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60068-2-2 ED6
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2024-04-19 2024-07-12
SUPERSEDES DOCUMENTS:
104/1021/CD, 104/1038A/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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the final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).
TITLE:
Environmental testing - Part 2-2: Tests - Test B: Dry heat
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
Committee positions. You may not copy or "mirror" the file or printed version of the document, or any part of it,
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IEC CDV 60068-2-2 © IEC 2024 2 104/1047/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 descriptions . 12
16 6.1 General . 12
17 6.2 Severities . 13
18 6.2.1 General . 13
19 6.2.2 High conditioning temperature T . 13
B
20 6.2.3 Exposure time t . 13
21 6.3 Test Bb: Dry heat for non-heat-dissipating specimens . 13
22 6.4 Test Bd: Dry heat for heat-dissipating specimens that are energized after
23 initial temperature stabilization . 15
24 6.5 Test Be: Dry heat for heat-dissipating specimens that are energized
25 throughout the test . 15
26 7 Testing procedure . 16
27 7.1 General . 16
28 7.2 Thermal radiation . 17
29 7.3 Specimen with artificial cooling or heating . 17
30 7.4 Mounting . 17
31 7.5 Preconditioning . 17
32 7.6 Initial measurements . 17
33 7.7 Conditioning . 18
34 7.8 Intermediate measurements . 18
35 7.9 Final temperature ramp . 18
36 7.10 Recovery . 18
37 7.11 Final measurements . 18
38 8 Information to be given in the relevant specification . 18
39 9 Information to be given in the test report . 19
40 Annex A (informative) Relationship of suffixes between Test A: Cold and Test B: Dry
41 heat . 21
42 Annex B (normative) Nomogram for the correction of the conditioning temperature . 22
43 B.1 Introduction . 22
44 B.2 Determination of the corrected high conditioning temperature T . 22
B’
45 B.2.1 General . 22
46 B.2.2 Application of the graphical solution method . 22
47 B.2.3 Application of the numerical solution method . 25
IEC CDV 60068-2-2 © IEC 2024 3 104/1047/CDV
48 B.2.4 Further adjustment of the corrected high conditioning temperature T . 26
B’
49 B.3 Exemplary application of the nomogram . 27
50 B.3.1 Exemplary test setup and specimen . 27
51 B.3.2 Graphical solution method . 27
52 B.3.3 Numerical solution method . 30
53 Annex C (informative) Advantages and disadvantages of available test procedures for
54 heat-dissipating specimens . 31
55 Bibliography . 32
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 B: Dry heat . 12
61 Figure 3 – Test Bb: Dry heat for non-heat-dissipating and non-operating specimens . 14
62 Figure 4 – Test Bb: Dry heat for non-heat-dissipating, operating specimens . 14
63 Figure 5 – Test Bd: Dry heat for heat-dissipating specimens that are energized after
64 initial temperature stabilization . 15
65 Figure 6 – Test Be: Dry heat for heat-dissipating specimens that are required to be
66 energized throughout the test . 16
67 Figure B.1 – Nomogram to determine the corrected conditioning temperature . 24
68 Figure B.2 – Test Bd (a) and Test Be (b) with the corrected conditioning temperature
69 T 25
B’
70 Figure B.3 – Test Bd (a) and Test Be (b) with the corrected conditioning temperature
71 T and a second temperature adjustment . 26
B’
72 Figure B.4 – Test Bd (a) and Test Be (b) with a preliminary temperature below the
73 corrected conditioning temperature T and a second temperature adjustment . 27
B’
74 Figure B.5 – Nomogram with exemplary application of the procedure . 29
76 Table 1 – Preferred values for the high conditioning temperature T . 13
B
77 Table 2 - Preferred values for the exposure time t . 13
78 Table A.1 – Relationship of suffixes between Test A: Cold, and Test B: Dry heat . 21
IEC CDV 60068-2-2 © IEC 2024 4 104/1047/CDV
83 INTERNATIONAL ELECTROTECHNICAL COMMISSION
84 ______________
86 ENVIRONMENTAL TESTING –
88 Part 2-2: Tests – Test B: Dry heat
91 FOREWORD
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