1、BRITISH STANDARD BS 7012-14: 1997 ISO 11883: 1997 Light microscopes Part 14: Marking of stereomicroscopes ICS 37.020BS7012-14:1997 This British Standard, having been prepared under the directionof the Sector Board for Materials and Chemicals, was published under the authority ofthe Standards Board a
2、nd comesinto effect on 15August1997 BSI 09-1999 ISBN 0 580 27855 7 National foreword This part of BS7012 has been prepared by Technical Committee LBI/33 Microscopes. It is identical with ISO11883:1997 Optics and optical instruments Microscopes Marking of stereomicroscopes published by the Internatio
3、nal Organization for Standardization (ISO). A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards
4、Catalogue under the section entitled “International Standards Correspondence Index”, or using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their
5、 correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the ISO title page, pages ii to iv, pages1 and2 and a back cover. This standard has been
6、updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBS7012-14:1997 BSI 09-1999 i Contents Page National foreword Inside front cover Foreword iii Text
7、of ISO 11883 1ii blankBS7012-14:1997 ii BSI 09-1999 Contents Page Foreword iii 1 Scope 1 2 Marking on main body of microscope 1 3 Marking on interchangeable or switchable objectives 1 4 Marking on magnification changer 1 5 Marking on binocular tube 2 6 Marking on accessories positioned in the optica
8、l path 2 7 Marking on eyepieces 2 8 Total magnification 2 Table 1 1 Table 2 1 Table 3 1 Table 4 2 Table 5 2 Table 6 2 Descriptors: Optics, optical equipment, microscopes, optical microscopes, stereomicroscopes, marking, optical properties.BS7012-14:1997 BSI 09-1999 iii Foreword ISO (the Internationa
9、l 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 technical committees. Each member body interested in a subject for which a technical committee has been es
10、tablished 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 with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardi
11、zation. 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 least75% of the member bodies casting a vote. International Standard ISO11883 was prepared by Technical Committee
12、 ISO/TC172, Optics and optical instruments, Subcommittee SC 5, Microscopes and endoscopes.iv blankBS7012-14:1997 BSI 09-1999 1 1 Scope This International Standard specifies the format for the marking of data for optical characteristics on stereomicroscopes, including operation microscopes, and gives
13、 recommendations for the marking of additional information. 2 Marking on main body of microscope Table 1 3 Marking on interchangeable or switchable objectives Marking is not mandatory on fixed objective(s) with a magnification factor of1,0; however, marking is mandatory on supplementary objective le
14、nses. Table 2 4 Marking on magnification changer Table 3 Category of marking Type or contents of marking Remarks Mandatory Name of manufacturer Recommended Country of manufacturer The marking of the country of origin is mandatory in several countries Recommended Model name or type Recommended Serial
15、 or manufacture number Category of marking Optical property Type or contents of marking Example Remarks Mandatory Magnification Magnification factor a 0,5 For operation microscopes it is not mandatory to mark the magnification if the focal length or the working distance is marked and the instruction
16、s for use contain a table giving the total magnification. Mandatory Focal length Focal length of the objective, in mm f = 200 mm It is not mandatory to mark both the magnification and the focal length. Recommended Working distance (WD) Free working distance, in mm WD = 185 mm For operation microscop
17、es, it is sufficient to mark the working distance. a The magnification factor of a supplementary objective lens is the factor by which it changes the total magnification of the stereomicroscope. The magnification factor of an interchangeable or switchable objective is the ratio of the magnification
18、of the stereomicroscope with the interchangeable or switchable objective to that of the stereomicroscope with the standard objective (magnification factor 1,0 ). Category of marking Optical property Type or contents ofmarking Example of marking Remarks Mandatory Magnification Minimum and maximum mag
19、nification factors or magnification scale 0,63 4 On a stepwise magnification changer, all steps should be indicated. In the case of fixed objective and fixed eyepieces, the magnification changer may be marked with the total magnification.BS7012-14:1997 2 BSI 09-1999 5 Marking on binocular tube Table
20、 4 6 Marking on accessories positioned in the optical path Table 5 7 Marking on eyepieces Table 6 8 Total magnification The value of the total magnification of a stereomicroscope is given by the product of the magnifications of the objective and the eyepiece, as well as the magnification factors of
21、the magnification changer, the binocular tube and any accessories in the optical path. Category of marking Optical property Type or contents of marking Example of marking Remarks Mandatory Magnification Magnification factor 1,25 A marking is mandatory only if the factor is different from 1,0 . Recom
22、mended Focal length Focal length of the tube lens, in mm f = 200 mm For operation microscopes, it is sufficient to mark the focal length if the instructions for use contain a table giving the total magnification. Category of marking Optical property Type or contents of marking Example of marking Rem
23、arks Mandatory Magnification Magnification factor a 1,25 A marking is mandatory only if the factor is different from 1,0 . a The magnification factor of an accessory is the factor by which it changes the total magnification of the stereomicroscope. Category of marking Optical property Type or conten
24、ts of marking Example of marking Remarks Mandatory Magnification Visual magnification 10 x If the magnification changer is marked with the total magnification, the magnification of the eyepiece shall not be indicated. Mandatory Field of view Diameter, in mm /18 Visual magnification and field of view
25、 number shall be separated by an oblique stroke, e.g. 10 /18. Mandatory Manufacturer Name or logo Recommended Type of field correction Flatfield PL Recommended Suitable for spectacle wearers Symbol Marking in conjunction with the magnification and field of view number, e.g. 10 /18 .3 blankBS 7012-14
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