1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2011 SAE International All rights reserved. No part of this publication m
3、ay be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside U
4、SA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedbackon this Technical Report, please visit http:/www.sae.org/technical/standards/J974_201104 SURFACE VEHICLE STANDARD J974 APR2011 Issued 1967-06 Reaffirmed 2011-04 Supersedin
5、g J974 AUG2002 Flashing Warning Lamp for Agricultural Equipment RATIONALE SAE J974 has been reaffirmed to comply with the SAE 5-Year Review policy. 1. ScopeThis SAE Standard covers the general requirements and the test requirements for a flashing warninglamp for agricultural equipment.2. References2
6、.1 Applicable PublicationsThe following publications form a part of this specification to the extent specifiedherein. Unless otherwise indicated, the latest issue of SAE publications shall apply.2.1.1 SAE PUBLICATIONSAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.SAEJ567Lamp B
7、ulb Retention SystemSAEJ575Test Methods and Equipment for Lighting Devices and Components for Use on Vehicles Lessthan 2032 mm in Overall WidthSAEJ578Color SpecificationSAEJ588Turn Signal Lamp for Use on Motor Vehicles Less than 2032 mm in Overall Width3. DefinitionThis flashing warning lamp is a li
8、ghting device to indicate both forward and rearward the presenceof agricultural equipment which normally travel at rates of speed below that of other traffic.4. General Requirements4.1 The lamp shall comply in both the forward and rearward direction with the candlepower requirements of aClass A turn
9、 signal, SAE J588, Table 1. In addition, the lamp shall project at least 4 cp on both sides at 90degrees to the lamp axis.4.2 The color of the light from the warning lamp shall be amber in accordance with SAE J578.4.3 The lamp shall be flashed at least 60 fpm (flashes per minute) but not more than 1
10、20 fpm when it is operating.4.4 The effective projected illuminated area measured on a plane at right angles to the axis of the lamp shall notbe less than 77.5 cm2(12 in2).SAE J974 Reaffirmed APR2011 Page 2 of 2 4.5 The bulb sockets shall comply with SAE J567.5. Test RequirementsThe flashing warning
11、 lamp shall be tested according to the following sections of SAEJ575:Section BSamples for TestSection CLamp BulbsSection DLaboratory FacilitiesSection EVibration TestSection FMoisture TestSection GDust TestSection HCorrosion TestSection JPhotometric TestAll beam candlepower measurements shall be mad
12、e with the filament of thesignal lamp at least 3 m (10 ft) from the photometer screen. The lamp axis is the horizontal linethrough the filament parallel to what would be the longitudinal axis of the vehicle if the lamp weremounted in its normal position on the vehicle.Section LWarpage Test on Devices with Plastic LensesPREPARED BY THE SAE AGRICULTURAL TRACTOR TECHNICAL COMMITTEEREAFFIRMED BY THE SAE AGRICULTURAL TRACTOR STANDARDS COMMITTEE
