SAE-J845-2007.pdf
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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 2007 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: 724-776-4970 (outside USA)
4、 Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org J845 REV. DEC2007 SURFACE VEHICLE RECOMMENDED PRACTICE Issued 1963-01 Revised 2007-12 Superseding J845 MAY1997 (R) Optical Warning Devices for Authorized Emergency, Maintenance, and Service Vehicles RATIONALE Based o
5、n the results of demonstrations conducted over the last ten years by the Emergency Warning Lights and Devices Standards Committee and the Signaling and Marking Standards Committee, the following changes have been made to this document. 1. Various editorial changes were made to harmonize the language
6、 with that used in other warning lights and devices standards. 2. Multiple flash patterns and cyclic patterns have been added. End users have increasingly been requesting non-repetitive flash patterns to prevent complacency. 3. Light Source definition has been added. 4. Light pulse and flash definit
7、ions have been revised. 5. Optical Power has been defined. 6. Multiple flash patterns that are user adjustable must be rated as the lowest performance mode. 7. Flash Rate was added to Section 5, “Tests”. 8. Test Voltage In conformance with other optical warning device reports, a tolerance has been a
8、dded to the test voltages, and requirements added for 36 volt systems. 9. Environmental tests for flash rate were revised. 10. Photometric performance has been changed from flash energy to meeting a specified optical power and peak intensity. Advances in laboratory instrumentation have made it pract
9、ical and cost effective to directly measure the optical power generated by any optical warning device. The direct measurement of peak intensity also is readily done with current technology. 11. The redefinition of the white boundary toward blue was added in anticipation of a change to the SAE J578 s
10、pecification to harmonize color boundaries with the ECE standard. 12. New markings for selective coverage devices were added to provide a marking distinction between omnidirectional devices and devices with selective coverage. SAE J845 Revised DEC2007 - 2 - 1. SCOPE This document provides design gui
11、delines, test procedure references, and performance requirements for omnidirectional and selective coverage, single color, optical warning devices used on authorized emergency, maintenance and service vehicles. It is intended to apply to, but not limited to, surface land vehicles. 2. REFERENCES 2.1
12、Applicable Publications The following publications form a part of this specification to the extent specified herein. Unless otherwise specified, the latest issue of the publication shall apply. 2.1.1 SAE Publications Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606
13、-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. SAE J575 Test Methods and Equipment for Lighting Devices and Components for Use on Vehicles Less than 2032 mm in Overall Width SAE J576 Plastic Material or Materials for Use in Optical Parts Such as Lenses and Reflex Reflector
14、s of Motor Vehicle Lighting Devices SAE J578 Color Specification SAE J759 Lighting Identification Code SAE J1889 L.E.D. Signal and Marking Lighting Devices 2.2 Related Publications The following publications are provided for information purposes only and are not a required part of this document. 2.2
15、.1 SAE Publications Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. SAE J387 TerminologyMotor Vehicle Lighting SAE J595 Directional Flashing Optical Warning Devices for Authorized Emergency,
16、Maintenance, and Service Vehicles SAE J1330 Photometry Laboratory Accuracy Guidelines SAE J2498 Minimum Performance of the Warning Light System Used on Emergency Vehicles 3. DEFINITIONS 3.1 Omnidirectional Optical Warning Device A flashing optical warning device that projects light in a horizontal 3
17、60 degree arc and vertically from 5 degrees up to 5 degrees down. It will appear to project flashes of light to an observer positioned at a fixed location. The flashes of light may be a repetitive signal or a non-repetitive signal. If a non-repetitive signal is used it shall be a block of repetitive
18、 signals that have been characterized. This would include all 360 beacons. -,-,- SAE J845 Revised DEC2007 - 3 - 3.2 Selective Coverage Optical Warning Device A flashing optical warning device that projects light in a defined horizontal arc of more than 40 degrees, but less than 360 degrees and verti
19、cally from 5 degrees up to 5 degrees down. It will appear to project flashes of light to an observer positioned at a fixed location within the arc of coverage. The flashes of light may be a repetitive signal or a non-repetitive signal. If a non-repetitive signal is used it shall be a block of repeti
20、tive signals that have been characterized. This would include all directional and oscillating warning devices, and omnidirectional devices within a lightbar that have the light beam blocked by internal components. 3.3 Light Source Any single, independently mounted, light-emitting component in the li
21、ghting system. A light source may consist of a single optical element or a fixed array of any number of optical elements whose geometric positioning relative to each other is fixed by the manufacturer of the light source and not intended to be modified. To be considered a single source, the elements
22、 must be adjacent and operate simultaneously in all modes, if the mode of the device is vehicle operator adjustable. 3.4 Optical Element Any discrete light emitter such as, but not limited to, an incandescent filament, HID or individual light emitting diode. 3.5 Primary Optical Warning Devices Devic
23、es or groups of devices that are intended to provide the primary visual optical warning signal as called out in each service class. Unless prohibited by law or regulation, a Class 1 device may be used in place of a Class 2 device and a Class 1 or 2 device may be used in place of a Class 3 device. 3.
24、6 Secondary Optical Warning Devices Devices or groups of devices of lower performance that can be used to provide supplemental optical warning to that provided by the primary optical warning device or devices. 3.7 Class 1 Optical Warning Devices Primary optical warning devices for use on authorized
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