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BS EN 60068-2-75:2014

BS EN 60068-2-75:2014

$167.15

Environmental testing – Tests. Test Eh: Hammer tests

Published By Publication Date Number of Pages
BSI 2014 36
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IEC 60068-2-75:2014 provides three standardized and coordinated test methods for determining the ability of a specimen to withstand specified severities of impact. It is used, in particular, to demonstrate an acceptable level of robustness when assessing the safety of a product and is primarily intended for the testing of electrotechnical items. It consists of the application to the specimen of a prescribed number of impacts defined by their impact energy and applied in the prescribed directions. This part of IEC 60068 covers energy levels ranging from 0,14 J (joules) to 50 J (joules). This second edition cancels and replaces the first edition, published in 1997, and constitutes a technical revision. This edition includes the following significant technical change with respect to the previous edition: – reconsideration of some values in Tables 1 and 2. Although some values are no longer recommended, they have been retained as alternatives for historical consistency purposes. It has the status of a horizontal standard in accordance with /2.

PDF Catalog

PDF Pages PDF Title
6 English
CONTENTS
8 INTRODUCTION
9 1 Scope
2 Normative references
10 3 Terms and definitions
4 Provisions common to all hammer test methods
4.1 Severities
4.1.1 General
4.1.2 Impact energy value
11 4.1.3 Number of impacts
4.2 Test apparatus
4.2.1 Description
Tables
Table 1 – Coordinated characteristics of the striking elements
12 4.2.2 Mounting
4.3 Preconditioning
4.4 Initial measurements
4.5 Testing
4.5.1 General
Figures
Figure 1 – Example sketch of a striking element
13 4.5.2 Attitudes and impact locations
4.5.3 Preparation of the specimen
4.5.4 Operating mode and functional monitoring
4.6 Recovery
4.7 Final measurements
4.8 Information to be given in the relevant specification
14 5 Test Eha: Pendulum hammer
5.1 Test apparatus
5.1.1 General
5.1.2 Test apparatus for severities not exceeding 1 J
5.1.3 Test apparatus for severities of 2 J and above
5.2 Height of fall
Table 2 – Height of fall
15 5.3 Testing
6 Test Ehb: Spring hammer
6.1 Test apparatus
Figure 2 – Derivation of measuring point
16 6.2 Influence of earth’s gravity
6.3 Calibration
7 Test Ehc: Vertical hammer
7.1 Test apparatus
7.2 Height of fall
Figure 3 – Shape of release head for 2 J
17 Annex A (normative) Shapes of striking elements
Figure A.1 – Example of a striking element for ≤ 1 J
Figure A.2 – Example of a striking element for 2 J
18 Figure A.3 – Example of a striking element for 5 J
Figure A.4 – Example of a striking element for 10 J
19 Figure A.5 – Example of a striking element for 20 J
Figure A.6 – Example of a striking element for 50 J
20 Annex B (normative) Procedure for the calibration of spring hammers
B.1 Principle of calibration
B.2 Construction of the calibration device
B.3 Method of calibration of the calibration device
21 B.4 Use of the calibration device
22 Figure B.1 – Calibration device
23 Figure B.2 – Pendulum “c”
Figure B.3 – Steel spring of pendulum “c”
24 Figure B.4 – Details of calibration device
25 Figure B.5 – Arrangement for the calibration of the calibration device
26 Figure B.6 – Division of scale plate “f”
27 Annex C (informative) Guidance notes
C.1 When is an impact test appropriate?
C.2 Choice of test apparatus
C.3 Choice of energy level
Table C.1 – Energy levels in joules
28 C.4 Information for testing
29 Annex D (informative) Example of pendulum hammer test apparatus
Figure D.1 – Test apparatus
30 Figure D.2 – Striking element of the pendulum hammer for energies ≤ 1 J
Figure D.3 – Mounting fixture
31 Figure D.4 – Adapter for flush-type switches
Figure D.5 – Adapter for lamp holders
32 Annex E (informative) Example of spring hammer test apparatus
Table E.1 – Kinetic energy of striking element
33 Figure E.1 – Spring hammer test apparatus
34 Bibliography

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BS EN 60068-2-75:2014
$167.15