《ISO-9022-18-1994.pdf》由会员分享，可在线阅读，更多相关《ISO-9022-18-1994.pdf（12页珍藏版）》请在三一文库上搜索。
1、INTERNATIONAL STANDARD ISO 9022-18 First edition 1994-07-15 Optics and Optical instruments - Environmental test methods - Part 18: Combined damp heat and low internal pressure Op tique et ins trumen ts d optique - Methodes d essais d environnemen t - Partie 18: Essai combine chaleur humide-Pression
2、interne basse Reference number ISO 9022-18: 1994(E) ISO 9022=18:1994(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national Standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO tech
3、nical committees. Esch member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
4、 with the International Electrotechnical Commission (1 EC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 %
5、 of the member bodies casting a vote. International Standard ISO 9022-18 was prepared by Technical Committee ISOJTC 172, Optics and Optical instruments, Subcommittee SC 1, Funda- mental Standards. ISO 9022 consists of the following Parts, under the general title Optics and op tical ins trumen ts - E
6、nvironmental test methods: - Part 1: Definitions, exten t of testing - Part 2: Cold, heat, humidity - Part 3: Mechanical stress - Part 4: Salt mist - Part 5: Combined cold, low air pressure - Part 6: Dust - Part 7: Drip, rain - Part 8: High pressure, low pressure, immersion - Part 9: Solar radiation
7、 - Part 10: Combined sinusoidal Vibration, dry heat or cold 0 ISO 1994 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utiiized in any form or by any means, electronie or mechanical, including photocopying and microfilm, without Permission in writing
8、 from the publisher. International Organization for Standardization Case Postale 56 l CH-l 211 Geneve 20 l Switzerland Printed in Switzerland ii -,-,- 0 ISO ISO 9022=18:1994(E) - Part 11: Mould growth - Part 12: Con tamination - Part 13: Combined shock, bump or free fall, dry heat or cold - Part 14:
9、 Dew, hoatfrost, ice - Part 15: Combined random Vibration wide band: reproducibility me- dium, in dry heat or cold - Part 16: Combined bounce or steady-state acceleration, in dry heat or cold - Part 17: Combined contamina tion, solar radiation - Part 18: Combined damp heat and low internal pressure
10、- Part 19: Temperature cycles combined with sinusoidal or random vibra tion - Part 20: Humid atmosphere con taining Sulfur dioxide or h ydrogen sulfide Annex A of this part of ISO 9022 is for information only. -,-,- ISO 902218:1994(E) Q ISO Introduction Optical instruments are affected during their
11、use by a number of different environmental Parameters which they are required to resist without sig- nificant reduction in Performance. The type and severity of these Parameters depend on the conditions of use of the instrument (for example, in the laboratory or Workshop) and on its geographical loc
12、ation. The environmental effects on Optical instrument Performance in the tropics and subtropics are totally different from those found when they are used in the arctic regions. Individual Parameters Cause a variety of different and overlapping effects on instrument per- formante. The manufacturer a
13、ttempts to ensure, and the user naturally expects, that instruments will resist the likely rigours of their environment throughout their life. This expectation tan be assessed by exposure of the instrument to a range of simulated environmental Parameters under controlled labo- ratory conditions. The
14、 severity of these conditions is often increased to obtain meaningful results in a relatively short period of time. In Order to allow assessment and comparison of the response of Optical instruments to appropriate environmental conditions, ISO 9022 contains details of a number of laboratory tests wh
15、ich reliably simulate a variety of different environments. The tests are based largely on IEC Standards, modified where necessary to take into account features special to Optical instruments. lt should be noted that, as a result of continuous progress in all fields, Optical instruments are no longer
16、 only precision-engineered Optical prod- ucts, but, depending on their range of application, also contain additional assemblies from other fields. For this reason, the principal function of the instrument must be assessed to determine which International Standard should be used for testing. If the O
17、ptical function is of primary importante, then ISO 9022 is applicable, but if other functions take precedence then the appropriate International Standard in the field concerned should be applied. Cases may arise where application of both ISO 9022 and other appropriate International Standards will be
18、 necessary. -,-,- INTERNATIONAL STANDARD 0 ISO ISO 9022=18:1994(E) Optics and Optical instruments - Environmental test methods - Part 18: Combined damp heat and low internal pressure 1 Scope This patt of ISO 9022 specifies methods of testing of Optical instruments and instruments containing Optical
19、components under equivalent conditions, for their ability to resist combined damp heat and low internal pressure. The purpose of testing is to investigate to what extent the Optical, thermal, Chemical and electrical perform- ante characteristics are affected by combined damp heat and low internal pr
20、essure. Annex A explains fur- ther the intention of the different types of tests. 3 General information and test conditions Exposure of the specimen to the combined stress conditions renders the test much more severe than separate exposure to any of the environmental con- ditions cited. Three differ
21、ent test methods are used to test the combined damp heat and low internal pressure re- sistance of Optical instruments. 4 Conditioning 2 Normative references The following Standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 9022. At the time
22、of publication, the editions indicated were valid. All Standards are subject to revision, and Parties to agreements based on this part of ISO 9022 are encouraged to investigate the possibility of applying the most recent editions of the Standards indicated below. Members of IEC and ISO maintain regi
23、sters of currently valid International Standards. ISO 9022-17 994 1, Optics and Optical instruments - Environmental test methods - Part 1: Definitions, extent of tes ting. ISO 9022-811994, Optics and Optical instruments - Environmental test methods - Part 8: High pressure, low pressure, Immersion. T
24、he required exposure time shall not commence until all park of the specimen have reached a temperature within 3 K of the test chamber temperature. Dew on the specimen is admissible. The individual test Steps shall be petformed directly one after another. Inter- ruption of the test is not admissible.
25、 4.1 Conditioning method 47: Damp heat and low internal pressure, pressure differente low See table 1 and figure 1. Conditioning method 47 shall be used for Optical in- struments where demands made on their sealing (Iow pressure resistance) are low, e.g. instruments which comply with the requirement
26、s of the degrees of se- verity 01, 02, 07 and 08 of conditioning method 81 in ISO 9022-8. 1) To be published. -,-,- ISO 9022=18:1994(E) (Q ISO 4.2 Conditioning method 48: Damp heat and low internal pressure, pressure differente medium See table 2. Conditioning method 48 shall be used for Optical in-
27、 struments where demands made on their sealing (low pressure resistance) are medium, e.g. instruments which comply with the requirements of the degrees of severity 03, 04, 09 and 10 of conditioning method 81 in ISO 9022-8. Table 1 - Degrees of severity for conditioning method 47: Damp heat and low i
28、nternal pressure, pressure diff erence low Condition 1 Relative humidity ( 40% m n n n n n n I I I 0 l I 1 0 I I l 11 fl ll II I l II II II Il l 1 J . . Relative humidi ty 90 % to 95 % 1 J 1 J Duration according to table 1 ReLa tive humidity ( 40% I I I 1 I I I I I I I I I l I I I I I f l l Duration
29、, h Condi tion 1 Condi tion 2 Condition 3 Figure 1 - Cycling curve for conditioning method 47, using example of degree of severity 01 2 -,-,- 0 ISO ISO 9022=18:1994(E) 4.3 Conditioning method 49: Damp heat and low internal pressure, pressure differente high See table 3. Conditioning method 49 shall
30、be used for Optical in- struments where demands made on their sealing (Iow pressure resistance) are high, e.g. instruments which comply with the requirements of the degrees of se- verity 05, 06, 11, 12 and 13 of conditioning method 81 in ISO 9022-8. Table 2 - Degrees of severity for conditioning met
31、hod 48: Damp heat and low internal pressure, pressure differente medium Condition 1 Table 3 - Degrees of severity for conditioning method 49: Damp heat and low internal pressure, pressure differente high Degree of severity 01 02 03 04 05 06 Condition 1 I Climatic conditions 40 “C k 2 “C and 90 % to
32、95 % relative humidity. I Constant pressure reduction in specimen interior referred to surrounding pressure Exposure time during con- stant pressure reduction h 2 34 32 34 32 26 Condition 2 Climatic conditions 40 “C number of specimens; c) location and number of temperature measuring Points; d) prec
33、onditioning, taking account of 6.2.2; e) type and scope of initial test, taking a 65 . l f ccount of f) method and extent of intermediate test, taking account of 6.2.4; g) recovery; h) type and 65 . l I scope of final test, taking account of i) criteria for evaluation, e.g. duration of moisture depo
34、sition, nature and extent of any changes oc- curring on Optical surfaces; j) type and scope of test report. 5 ISO 9022=18:1994(E) Annex A (informative) Explanatory notes A.1 Conditioning method 47 Conditioning method 47 is intended to create con- ditions similar to those experienced, for example, in
35、 climates with frequent alternation between strong sunshine and rain. Instruments with poor sealing are particularly at risk here due to the Penetration of hu- mid air. The low internal pressure is caused by Change of the temperature. conditions experienced by, for example, air freight. In the cargo
36、 compartments of aircraft, pressures as low as 500 mbar tan occur during flight. On landing in areas with high humidity, equalization of pressure in the interior of the instrument may Cause Penetration of moisture particularly into instruments with medium sealing. A.3 Conditioning method 49 A.2 Cond
37、itioning method 48 Conditioning method 48 is intended to simulate the Conditioning method 49 is not intended to simulate natura1 environmental conditions. lt should be used primarily to establish sealing against humidity in in- struments where sealing requirements are very high. This page intentionally left blank -,-,- ISO 9022=18:1994(E) ICS 37.020.00 Descriptors: optics, Optical equipment, tests, environmental tests, damp heat tests, low pressure tests, internal pressure. Price based on 6 pages -,-,-