Directional Flashing Optical Warning Devices for Authorized Emergency, Maintenance, and Service Vehicles
- Ground Vehicle Standard
- J595_202108
- Revised
Scope
Rationale
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2.1.1: Document SAE J1889 is no longer an applicable document since the definition of photometric stability was added to this document. SAE J2357 was added because it is now referenced in the electromagnetic interference guidelines.
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Section 3: Reordered and renumbered definitions to place them in alphabetic order per ANSI guidelines.
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3.1: The phrase “to call for the right-of-way” was added to the definitions to clarify conditions that indicate the need for Class 1 performance and to provide common language with SAE J2498.
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3.5: The definition of the term “duty-cycle” was added to clarify its meaning within the document.
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3.6: The limitation of “in all modes if the mode of the device is vehicle operator adjustable” was removed from the determination of when multiple EWD lamp assemblies can be considered as a single device because it is unneeded.
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3.7: The definition of the term “emergency warning device photometric stability” was added to clarify its meaning within the document.
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3.9: The definition of the term “flash energy” was added to clarify its meaning within the document.
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3.11: The definition of the term “on-time” was added to clarify its meaning within the document.
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3.14: The definition of the term “peak intensity” was added to clarify its meaning within the document.
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3.17: The definition of the term “pulse width modulation” was added to clarify its meaning within the document.
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3.19: The definition of the term “Talbot’s law” was added to clarify its meaning within the document.
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3.20: The definition of the term “warning mode” was added to clarify its meaning within the document.
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Section 4: Modified the language in the Class definition to include single warning mode allowance. Added the appending of the letter “M” to the device marking code to indicate devices that contain warning modes of different performance.
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Section 5: Renumbered the section to improve clarity.
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5.1.1: Added random vibration allowance.
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5.1.5: This section was re-written to clarify the measurement procedure and match the practices of test laboratories. Methods are provided to determine the photometric performance of un-tested flash patterns by photometric testing of a single flash pattern and determining an adjustment factor that can be applied to the photometric test results of the tested flash pattern. References to SAE J1330 and SAE J1889 removed.
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5.2: Revised the text to clarify incandescent sources may be operated steady burning and that device chromaticity be tested at 1 minute and when photometric stability has been reached.
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5.4: Revised the flash characteristics that must be measured to the ones needed to determine compliance to the definition of a flash.
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6.4: References to the definitions of a light pulse and flash were added to the requirements to eliminate ambiguity. The list of required characteristics that must be included in a report was deleted.
Recommended Content
Ground Vehicle Standard | Optical Warning Devices for Authorized Emergency, Maintenance, and Service Vehicles |
Ground Vehicle Standard | Emergency Vehicle Sirens |
Ground Vehicle Standard | Minimum Performance of the Warning Light System Used on Emergency Vehicles |
Topic
Data Sets - Support Documents
Title | Description | Download |
---|---|---|
Unnamed Dataset 1 | ||
Unnamed Dataset 2 | ||
Table 1 | Test voltages |
Issuing Committee
Emergency Warning Lights and Devices Standards Committee
The Emergency Warning Lights and Devices Standards Committee is part of the Lighting Systems Steering Committee that reports to the Motor Vehicle Council (MVC).The Committee is responsible for developing and maintaining SAE Standards, Recommended Practices, and Information Reports related to the minimum performance specifications and best practices of emergency warning lights and sirens for vehicles. Participants in the SAE Emergency Warning Lights and Devices Standards Committee include OEMs, test laboratories, consulting firms, government, and other interested parties.