AS 60068.2.18-2003

1 - AS 60068.2.18-2003 ENVIRONMENTAL TESTING - TESTS-TEST R AND GUIDANCE: WATER
4 - PREFACE
5 - CONTENTS
7 - INTRODUCTION
9 - 1 Scope and object
9 - 2 Normative references
9 - 3 Definitions
9 - 3.1 rain
9 - 3.2 drizzle
10 - 3.3 raindrop
10 - 3.4 drizzledrop
10 - 3.5 rainfall or drizzle intensity (R)
10 - 3.6 median volume diameter (D50)
10 - 4 Survey of water tests
10 - 4.1 General
10 - 4.2 Description of Tests R: Water
11 - 5 Test Ra: Falling drops
11 - 5.1 Object
11 - 5.2 Method Ra 1: Artificial rain
11 - 5.2.1 General description of the test
12 - 5.2.2 Severities
12 - 5.2.3 Preconditioning
12 - 5.2.4 Initial measurements
12 - 5.2.5 Testing
13 - 5.2.6 Recovery
13 - 5.2.7 Final measurements
14 - 5.2.8 Information to be given in the relevant specification
14 - 5.3 Method Ra 2: Drip box
14 - 5.3.1 General description of the test
15 - 5.3.2 Severities
15 - 5.3.3 Preconditioning
15 - 5.3.4 Initial measurements
15 - 5.3.5 Testing
15 - 5.3.6 Recovery
15 - 5.3.7 Final measurements
16 - 5.3.8 Information to be given in the relevant specification
16 - 6 Test Rb: Impacting water
16 - 6.1 Object
16 - 6.2 Method Rb 1: Oscillating tube and spray nozzle
16 - 6.2.1 General description of the test
16 - 6.2.2 Method Rb 1.1: Oscillating tube
20 - 6.2.3 Method Rb 1.2: Spray nozzle
22 - 6.3 Method Rb 2: Water jet
22 - 6.3.1 General description of the test
23 - 6.3.2 Severities
23 - 6.3.3 Preconditioning
23 - 6.3.4 Initial measurements
23 - 6.3.5 Testing
24 - 6.3.6 Recovery
24 - 6.3.7 Final measurements
24 - 6.3.8 Information to be given in the relevant specification
24 - 7 Test Rc: Immersion
24 - 7.1 Object
25 - 7.2 Method Rc 1: Water tank
25 - 7.2.1 General description
25 - 7.2.2 Severities
25 - 7.2.3 Preconditioning
25 - 7.2.4 Initial measurements
25 - 7.2.5 Testing
25 - 7.2.6 Recovery
26 - 7.2.7 Final measurements
26 - 7.2.8 Information to be given in the relevant specification
26 - 7.3 Method Rc 2: Pressurized water chamber
26 - 7.3.1 General description of the test
26 - 7.3.2 Severities
26 - 7.3.3 Preconditioning
26 - 7.3.4 Initial measurements
27 - 7.3.5 Testing
27 - 7.3.6 Recovery
27 - 7.3.7 Final measurements
27 - 7.3.8 Information to be given in the relevant specification
28 - Annex A - Water characteristics to be considered when writing the relevant specification
28 - A.1 General
28 - A.2 Purity
29 - A.3 Water quality for Tests R
30 - Annex B - General guidance
30 - B.1 General
30 - B.2 Factors affecting the test severity
31 - Annex C - Guidance for Test Ra
31 - C.1 General
31 - C.2 Example of test apparatus
32 - C.3 Verification of test apparatus
35 - Annex D - Guidance for Test Rb
35 - D.1 General
35 - D.2 Example of test apparatus
40 - Annex E - Guidance for Test Rc
40 - E.1 General
40 - E.2 Example of test apparatus
40 - E.3 Verification of test apparatus

AS 60068.2.18-2003 identically adopts IEC 60068-2-18:2000 which provides methods of test applicable to products which, during transportation, storage or in service, may be subjected to falling drops, impacting water or immersion.

This part of IEC 60068 provides methods of test applicable to products which, during transportation, storage or in service, may be subjected to falling drops, impacting water orimmersion. The primary purpose of water tests is to verify the ability of enclosures, coversand seals to maintain components and equipment in good working order after and, when necessary, under a standardized dropfield or immersion in water.These tests are not corrosion tests and should not be considered and used as such.The effects of a large temperature difference between the water and the specimen, such asincreased water ingress resulting from pressure changes, as well as thermal shock, are notsimulated.Established water tests in other standards are not intended to simulate natural rainfall andtheir quoted intensities are too high to be adopted for that purpose. Therefore, in addition to the high-intensity severities, Test R includes an artificial rain test based upon naturalconditions but not taking into account high wind speeds generally associated with natural rain.Guidance is given on the applicability of the tests and the severities to be selected.

First published as AS 60068.2.18-2003.