SAE J994 pdf download
SAE J994 pdf download.Alarm-Backup—Electric Laboratory Performance Testing.
1. The scope of this SAE Standard is the definition of the functional, environmental, and life cycle test requirements for electrically operated backup alarm devices pnmarily intended for use on off-road, sell- propelled work machines as defined by SAE J1116 (limited to categories of 1) construction, and 2) general purpose industrial).
1.1 Purpose—The purpose of this document is to define a set of performance requirements for backup alarms, independent of machine usage. The laboratory tests defined in this document are intended to provide a uniform and repeatable means of verilying whether or not a test alarm meets the stated requirements. For on machine requirements and test procedures. refer to SAE J1446.
2. References
2.1 ApplIcable Publications—The following publications form a part of the specification to the extent specified herein. Unless otherwise indicated, the latest revision of SAE publications shall apply,
2.1,1 SAE PueucAraoNs—Avallable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.
SAE J184—Oualitying a Sound Data Acquisition System
SAE J1 116—Categories of Off-Road Self-Propelled Work Machines
SAE J1446—On-Macfline Alarm Test and Evaluation Procedure for Construction and General Purpose Industrial Machinery
2.1.2 ANSI PuBLIcATIONs—Available from ANSI. 25 West 43rd Street. New rbrk, NV 10036-8002. ANSI Si .4—Specification for Sound Level Meters
ANSI St .40—Specification for Acoustical Calibrators
2.1.3 ASTM PuBucArtcwI—Available from ASTM, 100 Barr Harbor Drive. West Conshohocken, PA 19428-2959, ASTM B 117—Method of Salt Spray (Fog) Testing
2.1.4 Mu SPEcccATION—AvaiIab4e from Defense Printing Service, Delachment Office, 700 Robbins Avenue, Building 40, Philadelphia, PA 19111-5094.
MIL-STD-810B—Environmental Test Methods 510 and 514.1
2.2 Related Publicatlons—The following publications are provided for information purposes only and are not a required part of this document,
2.2.1 SAE Pu&icATioNS—Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.
SAE J1 105—Performance. Test and Application of Electric Forward Warning Horn
SAE J1211—Reoommended Environmental Practices for Environmental Electronic Equipment
SAE J1 455—Recommended Environmental Practices for Electronic Equipment Design (Heavy-Duty Trucks)
SAE Ji 849 — Emergency Vehide Sirens
2.2.2 ANSI PuBLICATIONs—Available from ANSI. 25 West 43rd Street, New rbrk. NY I 0036•8002
ANSI Si i—Acoustical Terminology
ANSI S1.13—Methods for the Measurement of Sound Pressure Level
3. Definitions
3.1 Free Field—A free field, for the purposes of this document, is defined as a space with no reflecting surface within 15 m of the sound source in any direction.
3.2 Horizontal ReflectIng Plane—A horizontal reflecting plane is defined as flat ground with a surface no rougher than an asphalt road. A paved parking lot with no reflecting surfaces within 15 rn would be an acceptable horizontal reflecting plane for the tests outlined in this document.
3.3 Zero Degree Axis—A line known as the zero degree axis is defined to correspond to the centerline of the sound producer. perpendicular to and extending outward from the output face of the alarm.
3.4 Sample Alarm—A sample alarm shall consist of an alarm randomly drawn from the production population.
3.5 Predominant Sound Frequency—The predominant sound frequency of the alarm shall be defined as the frequency that produces me highest A.weighted sound pressure level. This frequency may or may not correspond to the fundamental frequency produced by the alarm.
3.6 Test Voltages—The nominal, extreme low, and extreme high system test voltages are defined for each system voltage In Table 1. All voltages are ±0.2 V, measured at the input terminals of the alarm when the alarm is operating,
3.6.1 TEST VO(.TAGE TABLE
NOTE— On multivoltage alarms, use the extreme low system voltage from the lowest system voltage included in the multi-voltage range, and the extreme high system voltage from the highest included voltage range, and all induded nominal voltages, unless otherwise specified.
