The scope of this SAE Standard is the definition of the functional, environmental, and life cycle test requirements for electrically operated, operator controlled forward warning horn devices, primarily intended for use on self-propelled, work machines as defined by SAE J1116 (limited to categories of (1) construction and (2) general purpose industrial).
Rationale
Test of performance of horns by several manufacturers revealed that the predominant frequency was sometimes higher than the standard specified maximum of 2800 Hz, while all horns contained a rich spectrum of harmonic frequencies, starting below 500 Hz and reaching beyond 2800 Hz. To better describe such frequency content, definitions of excitation and fundamental frequencies, low and high sound frequency zones are added.
Added requirements for low and high frequency content will ensure that the horn sound is not concentrated in a narrow frequency band and will increase audibility of the horn signal in presence of masking sounds. Low frequency zone limit of 700 Hz will ensure at least five harmonics in the specified band ending at 3500 Hz.
The upper limit for predominant frequency increase from 2800 to 3500 Hz can only be supported when low frequency sound components are added to the requirements.
Low frequency requirement helps distinguish the horn sound from the warning sirens and back up alarms.
Rest time between successive sound measurements is added to avoid horn overheating.
Distance between horn and microphone is specified at 2.4 m to avoid near field measurements at low frequencies.
Moved predominant frequency definition from Requirements to Definitions section.
Replaced magnetic tape recorder with sound recorder to remove an obsolete term.
Clarified confusing g and displacement values in vibration test.
OPTC3 addresses standards related to sounds, lighting and marking for off-road, self-propelled work machines, and equipment. This committee reports to ConAg Council through OPTC. ConAg Council covers machines described in SAE J1116 which includes machines defined in ISO 6165, ISO 6814, and ISO 22242, with regards to activities supporting; • Creating consensus SAE standards, recommended practices, and information reports • Harmonizing relevant SAE documents with ISO documents • Assisting the US with the creation and maintenance of ISO standards through US TAGs o ISO/TC 127 --- Earth-moving machinery o ISO/TC 195 --- Building construction machinery and equipment o ISO/TC 23/SC 15 --- Machinery for forestry Participants in this committee include OEMs, suppliers, consulting firms, government, and others across the construction and forestry industries.
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J1105_202208
Horn - Forward Warning - Electric - Performance, Test, and Application
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