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BS EN IEC 60068-2-14:2023 – TC

BS EN IEC 60068-2-14:2023 – TC

$217.84

Tracked Changes. Environmental testing – Tests. Test N: Change of temperature

Published By Publication Date Number of Pages
BSI 2023 87
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PDF Catalog

PDF Pages PDF Title
1 30480461
47 A-30445529
48 undefined
51 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
52 English
CONTENTS
54 FOREWORD
56 INTRODUCTION
57 1 Scope
2 Normative references
3 Terms and definitions
58 4 Symbols
5 General
5.1 Field conditions of changing temperature
59 5.2 Design of tests with temperature change
5.3 Test parameters
60 5.4 Purpose and choice of the tests
5.5 Choice of the exposure time to each conditioning temperature
61 5.6 Choice of the duration of the transfer time t2
5.7 Applicability limits of change of temperature tests
Figures
Figure 1 – Determination of the exposure time t1 of the specimen to each conditioning temperature
62 6 Initial and final measurements
6.1 General
6.2 Initial measurements
6.3 Final measurements
7 Test Na: Rapid change of temperature
7.1 General description of the test
7.2 Testing procedure
7.2.1 Testing chamber
63 Figure 2 – Schematic representation of examples of thermal test cabinets and test procedure with two separate test chambers
64 Figure 3 – Schematic representation of examples of thermal test cabinets with one test chamber
65 7.2.2 Mounting or supporting of the test specimen
7.2.3 Severities
Figure 4 – Possibility of condensation during rapid temperature change
Figure 5 – Possibility of condensation during transfer of the specimen
66 7.2.4 Preconditioning
Figure 6 – Increased severity of Test Na
67 7.2.5 Test cycle
Figure 7 – Na test cycle, one-chamber method
69 7.3 Recovery
8 Test Nb: Change of temperature with specified rate of change
8.1 General description of the test
Figure 8 – Na test cycle, two-chamber method
70 8.2 Testing procedure
8.2.1 Testing chamber
8.2.2 Mounting or supporting structure of the test specimen
8.2.3 Severities
71 8.2.4 Tolerance
72 8.2.5 Preconditioning
8.3 Test cycle
Figure 9 – Tolerance for fluctuation of test temperatures
73 8.4 Recovery
Figure 10 – Nb test cycle
Figure 11 – Test times for intermediate operation of specimens
74 9 Test Nc: Rapid change of temperature, two-fluid-bath method
9.1 General description of the test
9.2 Testing procedure
9.2.1 Testing equipment
9.2.2 Severities
9.2.3 Conditioning
75 9.3 Test cycle
9.4 Recovery
Figure 12 – Nc test cycle
76 10 Information to be given in the test report
77 Annex A (informative) Potential consequences of improper severities
Figure A.1 – Delayed temperature change of the specimen
78 Annex B (informative) Thermal responsiveness of different materials and geometries
Figure B.1 – Rate of temperature change of specimen with differing thermal responsiveness
79 Annex C (normative) Auxiliary table with exemplary temperature tolerances ±σT for preferred combinations of high and low conditioning temperatures and rates of temperature change (Test Nb)
80 Figure C.1 – Tolerance for fluctuation of test temperatures for exemplary test parameters
81 Tables
Table C.1 – Applicable temperature tolerances ±σT in K for preferred combinations of high and low conditioning temperatures and rates of temperature change dTR
85 Bibliography

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BS EN IEC 60068-2-14:2023 - TC
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