ISO-8728-1997.pdf
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1、INTERNATIONAL STANDARD IS0 8728 Second edition 1997-06- 15 Ships and marine technology - Marine gyro-compasses Navires et technoiogie maritime - Compas gyroscopiques B usage marin Reference number IS0 8728: 1997(E) Copyright International Organization for Standardization Provided by IHS under licens
2、e with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/21/2007 02:50:11 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8728: 1997(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards
3、bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 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 organizat
4、ions, governmental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circul
5、ated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 8728 was prepared by Technical Committee lSO/TC 8, Ships and marine technology, Subcommittee SC 6, Navigation. This second
6、 edition cancels and replaces the first edition (IS0 8728:1987), which has been technically revised. Annex A forms an integral part of this International Standard. Annex B is for information only. 0 IS0 1997 All rights reserved. Unless otherwise specified, no par? of this publication may be reproduc
7、ed or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 l CH-1211 Geneve 20 l Switzerland Internet central iso.ch x.400 c=ch; a=400net;
8、 p=iso; o=isocs; s=central Printed in Switzerland ii Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/21/2007 02:50:11 MDTNo reproduction or networking permitted without license from IHS
9、-,-,- INTERNATIONAL STANDARD IS0 IS0 8728:1997(E) Ships and marine technology - Marine gyro-compasses 1 Scope This International Standard specifies the construction, performance and type testing for gyro-compasses required by Chapter V of SOLAS, 1974. 2 Normative references The following standards c
10、ontain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to invest
11、igate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. ISO/R 694: 1968, Positioning of magnetic compasses in ships. IEC 9451994, Marine navigational equipment - Genera/ require
12、ments - Methods of testing and required test results. International Convention on Safety of Life at Sea (SOLAS) 1974 (amended). 3 Definitions For the purposes of this International Standard, the following definitions apply. 3.1 gyro-compass: Complete equipment including all essential elements of the
13、 complete design. 3.2 true heading: Horizontal angle between the vertical plane passing through the true meridian and the vertical plane passing through the ships fore-and-aft datum line; it is measured from true north (000”) clockwise through 360. NOTE - When the gyro-compass equipment is not insta
14、lled on board ship, this “true heading” is regarded as the true heading of the lubber line. Where a gyro-compass has the facility of introducing a correction by moving the lubber line, the correction is set for the local latitude. 3.3 settled: Stable situation when any three readings taken at interv
15、als of 30 min are within a band of 0,7”, with the compass level and stationary. NOTE - The settling time is the elapsed time between the time of switch-on at the initial heading error and the third recording of the settle. 3.4 settle point heading: Mean value of ten readings taken at 20 min interval
16、s after the compass has settled as defined in 3.3. 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/21/2007 02:50:11 MDTNo reproduction or networking permitted without license from IHS
17、-,-,- IS0 8728:1997( E) IS0 3.5 3.6 settle point error: Difference between the settle point heading as defined in 3.4 and the true heading. error: Difference between the observed value and the settle point heading as defined in 3.4. 3.7 bearing repeater compass: Device that reproduces the master com
18、pass card at a remote location. 3.8 compass card: Graduated dial of the compass which indicates the measured direction of the meridian. 39 upon latitude error: Error to which the local latitude. some gyro-compasses are subject 9 the magnitude and sign of which depend NOTE - Means are provided for co
19、rrecting this error. 3.10 speed error: Error to which gyro-compasses are subject, the magnitude and sign of which depend upon the speed, course and latitude of the ship. NOTE - Means are provided for correcting this error. 3.11 lubber line: Index line situated on the body of a compass against which
20、the compass heading is read. 3.12 master compass: Main compass unit which supplies the heading information to the repeaters and other navigational aids. 3.13 Scorsby table: Test machine which independently oscillates a platform about three axes; it is used to simulate the motion of a ship. 4 Constru
21、ction Gyro-compass units shall conform to the following requirements. 4.1 The equipment shall be capable of continuous operation under conditions of vibration, humidity, change of temperature and variations of the power supply as specified in 6.10.1 to 6.105 4.2 For follows. those ships are required
22、 to carry bearing repeater compasses, the con struction of shall be as a) The bearing repeater compass shall be designed to be fitted with an azimuth reading device. b) A gimbal mechanism shall be provided to enable the bearing repeater compass card to be held horizontally against the ships motion c
23、) Any bearing repeater compass intended for use on an open deck shall be waterproof. 4.3 The compass card shall be graduated at equal intervals of 1 O or fraction thereof. The graduation error shall be less than + 0,2”. A numerical indication shall be provided at least at every IO”, starting from OO
24、OO clockwise through 360. 4.4 Fully adequate illumination shall be provided to enable the reading of all compass cards at all times. Facilities for dimming shall be provided. 4.5 Both master compass and repeater compasses shall be provided with a lubber line to indicate the ships heading. 4.5.1 The
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