CAN CSA-ISO 9241-3A-2007 Ergonomic requirements for office work with visual display terminals (VDTs) - Part 3 Visual display requirements AMENDMENT 1 (First Edition).pdf

1、 Reference numberISO 9241-3:1992/Amd.1:2000(E)ISO 2000INTERNATIONAL STANDARD ISO9241-3First edition1992-07-15AMENDMENT 12000-12-15Corrected version2002-12-15Ergonomic requirements for office work with visual display terminals (VDTs) Part 3: Visual display requirements AMENDMENT 1 Exigences ergonomiq

2、ues pour travail de bureau avec terminaux crans de visualisation (TEV) Partie 3: Exigences relatives aux crans de visualisation AMENDEMENT 1 Amendment 1:2007 toNational Standard of CanadaCAN/CSA-ISO 9241-3-00Amendment 1:2000 to International Standard ISO 9241-3:1992 has been adopted without modifica

3、tion (IDT)as Amendment 1:2007 to CAN/CSA-ISO 9241-3-00. This Amendment was reviewed by the CSA TechnicalCommittee on Office Ergonomics, under the jurisdiction of the Strategic Steering Committee on OccupationalHealth and Safety, and has been formally approved by the Technical Committee.June 2007 Int

4、ernational Organization for Standardization (ISO), 2000. All rights reserved. NOT FOR RESALE. (reaffirmed 2011)ISO 9241-3:1992/Amd.1:2000(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be ed

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9、.iso.org ii ISO 2000 All rights reservedAmendment 1:2007 to CAN/CSA-ISO 9241-3-00ISO 9241-3:1992/Amd.1:2000(E) ISO 2000 All rights reserved iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of pre

10、paring International Standards is normally carried out through ISO technical committees. Each 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

11、 liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft Interna

12、tional 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 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this Amendment may

13、be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Amendment 1 to International Standard ISO 9241-3:1992 was prepared by Technical Committee ISO/TC 159, Ergonomics, Subcommittee SC 4, Ergonomics of human-system interaction. This correcte

14、d version of ISO 9241-3:1992/Amd.1:2000 incorporates the following corrections. On page 1, the phrase “Delete NOTE 11, in 7.1” has been deleted, indicating that the entire text of 7.1 has been replaced. The text of 7.2 e) has now been deleted. On page 13, a new sentence has been added before “Add th

15、e following references to the Bibliography”, and the publication date of 28 has been changed. Amendment 1:2007 to CAN/CSA-ISO 9241-3-00ISO 9241-3:1992/Amd.1:2000(E) ISO 2000 All rights reserved 1Ergonomic requirements for office work with visual display terminals (VDTs) Part 3: Visual display requir

16、ements AMENDMENT 1 Pages iii and iv, Contents Replace the titles of annex C and clauses C.2 and C.5 to C.12 with the following: Annex C Visual performance and comfort test C.2 Test participants C.5 Methods C.6 Dependent measures C.7 Statistical treatment of results C.8 Conformance C.9 Critical value

17、s for Barnards U test Page vi, Foreword Replace the final sentence with the following text: Annex C forms a normative part of this part of ISO 9241. Annexes A, B and D are for information only. Pages 15 and 16, subclause 7.1 Replace the existing text of 7.1 with the following text: 7.1 Conformance w

18、ith this part of ISO 9241 is achieved by meeting all the mandatory requirements of clause 5. Where the physical measurements required to comply with clause 5 cannot be carried out because the display under test uses a new technology that makes the metrological measurements difficult or impossible, c

19、ompliance is achieved by obtaining a positive result using the test method and associated mandatory requirements specified in annex C. Page 16, subclause 7.2 Delete 7.2 e). Page 22, annex C Replace annex C with the following text. Amendment 1:2007 to CAN/CSA-ISO 9241-3-00ISO 9241-3:1992/Amd.1:2000(E

20、) 2 ISO 2000 All rights reservedAnnex C (normative) Visual performance and comfort test C.1 Principle C.1.1 Purpose and use of test This annex describes a procedure for testing the visual quality of VDTs where the entire set of physical requirements (defined in clause 5) cannot be applied, for examp

21、le, to novel display technologies such as new types of flat panel display (such as electroluminescent and field emission displays). The test consists of a search task and an assessment of visual comfort. The combination of test results will be referred to as the visual quality of a display. C.1.2 In

22、tent and scenario of use The intention behind this test method is to provide a test method for displays that cannot otherwise be tested for conformance with this part of ISO 9241. This test method is not an alternative test method, in the sense that a display manufacturer can choose either the physi

23、cal requirements specified in clause 5 or this method. Instead, the test method provides a testing route for displays that cannot be tested according to the requirements specified in clause 5 because the display under test uses a new technology that makes the metrological measurements difficult or i

24、mpossible (see 7.1). C.1.3 Overview of test method This test procedure measures the effectiveness of the transfer of visual information in terms of participants search performance for targets embedded in alphanumerics on a candidate display versus those same participants performance for such a task

25、on a benchmark display. Effectiveness in this context means that the user is able to detect and recognize the visual targets accurately, quickly and without visual discomfort. If the display passes this particular visual search and rating performance test, it can be assumed capable of other presenta

26、tions of information such as (but not limited to) non-alphanumeric languages and business graphics. The dependent variables of the test are the search velocity achieved by the test participants in a visual letter search task and subjective ratings of visual comfort using a category scale. The combin

27、ation of the test results will be referred to as the visual quality of a display. Testing takes place in a simulated office environment, with test participants representative of the anticipated user population. The method i.e. a letter search task applying pseudo-text in combination with scaling of

28、experienced visual comfort, was first developed and tested by researchers of the IPO, Center for Research on User-System Interaction (Boschman the list is not intended to be complete. g127g3 Selection of test participants (e.g. avoid selection of particular age groups). g127g3 Configuration of displ

29、ays (during the test, the benchmark display shall meet all the requirements of clause 5). g127g3 Environmental conditions (lighting and other conditions shall be equal for both displays, to avoid detrimental conditions for one of them). g127g3 Instructions to the test participants (these should be i

30、mpartial). C.2 Test participants Test participants should be a sample representing the anticipated user population (those who perform office tasks as specified in the scope of this part of ISO 9241). All test participants shall have near visual acuity that is normal, or corrected to normal, at the d

31、esign viewing distance and shall be without any obvious physical or physiological conditions that could influence either their search performance or their perceived image quality. C.3 The displays The test display shall be a production or full-feature pre-production unit. It shall incorporate all an

32、ti-glare and reflection filters and treatments that will be in the production unit. The benchmark display shall be supplied or nominated by the supplier of the test display and shall meet or exceed all mandatory requirements in clause 5 of this part of ISO 9241. The displays may be labelled for iden

33、tification purposes (e.g. “Display 1“ and “Display 2“). Under these conditions, the test participants should not be informed which is the test and which is the benchmark display, so half of them should have the test display labelled as “Display 1” and the other half should have the benchmark display

34、 labelled as “Display 1”. C.4 Test workstation and environment C.4.1 General requirements The test shall be conducted in an area that is free from distractions and external interference which could influence the test results. The ambient conditions shall fall within the range defined in ISO 9241-6.

35、These conditions shall be comfortable and shall not be subject to significant variation during the test, both within a test participants session and between test participants. C.4.2 Environment The thermal environment, the background noise level, the ambient lighting, and the reflectance of work sur

36、faces shall meet the minimum requirements in ISO 9241-5 and ISO 9241-6. The ambient illumination shall be designed to minimize glare and specular reflections (see ISO 9241-7). Constant lighting conditions shall be maintained both within a participants session and between test participants. The test

37、participants shall be light-adapted by being placed in the test room for 10 min prior to the test. NOTE This period may be used by the experimenter to instruct each test participant about the test. Amendment 1:2007 to CAN/CSA-ISO 9241-3-00ISO 9241-3:1992/Amd.1:2000(E) 4 ISO 2000 All rights reservedC

38、.4.3 Workstation for the test The display and associated equipment (for example, the keyboard) shall be supported by a work surface that meets the requirements of ISO 9241-5. For both the benchmark display and the test display, the viewing distance shall be set according to their design viewing dist

39、ance. This distance should be constrained by a head-and-chin rest, the height of which is adjustable. The individual height adjustments for the test participants should be such that for both the test display and the benchmark display, the position of the eyes with respect to the display is equal for

40、 all test participants. The position of the test participants eyes shall comply with the line-of-sight angle requirements in 5.2 of this part of ISO 9241. The brightness and contrast settings of the benchmark display shall be specified by the manufacturer who nominates the display: at these settings

41、 it shall meet or exceed all mandatory requirements in clause 5 of this part of ISO 9241. NOTE A measurement procedure for specifying brightness and contrast is given in this part of ISO 9241. According to the manufacturers wishes, the brightness and contrast settings of the test display should be e

42、ither a) fixed at settings specified by the manufacturer, or b) adjustable by test participants to their personal optimum settings. Both displays shall be allowed to warm-up for at least 20 min prior to the test. The test participant shall be seated in a chair that meets the requirements of ISO 9241

43、-5. C.5 Methods C.5.1 Test material The test material shall be pseudo-text generated from a character set associated with an 8-bit single-byte coded graphic character set as given in ISO/IEC 8859, which describes a collection of character sets for various languages. If a system cannot display text i

44、n an alphabet familiar to the users, text should be displayed by double-byte coded characters (e.g. Asian characters). In this case, the language used shall be specified in the compliance statement. Each test will use a specified character subset (e.g. “A“ . “Z“, “a“ . “z“, and “0“ . “9”). The same

45、sub-set shall be used for both displays. Pseudo-text shall be generated from the character set according to the following constraints. g127g3 Pseudo-texts shall consist of blocks of random strings of characters separated by spaces. g127g3 The texts, on both test and benchmark display, shall consist

46、of a constant number of lines and a constant number of characters per line (including space characters). g127g3 The number of characters per line shall be chosen so that the line length (in centimetres) is less than 25 times the line-to-line distance (i.e. the height of the display area divided by t

47、he maximum number of lines). However, a line should contain at least 30 characters (including embedded spaces). The total number of characters in a pseudo-text shall be between 400 and 600, embedded spaces included. The pseudo-text blocks (see C.5.2) shall be sized such that, if 5 blocks could be di

48、splayed at once (one in each corner and one in the middle), they would have minimum overlap while maximizing coverage of the display area. g127g3 Each test participant is instructed to count the occurrences of a single target character over the entire test (e.g. test participant x is instructed to s

49、earch for “A“s during the entire test, test participant y is instructed to search for “R“s, ., etc.). Amendment 1:2007 to CAN/CSA-ISO 9241-3-00ISO 9241-3:1992/Amd.1:2000(E) ISO 2000 All rights reserved 5g127g3 The number of targets shall be 2 % to 3 % of the total number of characters in the text, including embedded spaces. g127g3 The position of the targets shall be randomly chosen with the restriction that a line may not start or end with the target character. g127g3 The texts shall contain a constant number of spaces. The space fraction sh