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AS ISO 9533:2020 pdf free

AS ISO 9533:2020 pdf free.Earth-moving machinery一Machine-mounted audible travel alarms and forward horns一Test methods and performance criteria
The test area shall consist of a free field above a hard reflecting plane no rougher than non-porous asphalt. The test area bordered by the machine and the microphone shall also consist of a flat, horizontal surface or surface sloping downwards away from the centre of the test area. No reflective objects such as buildings should be within 30 m of the microphone or the machine being measured.
The test technician or test equipment shall be > 2 m from the sound-measuring microphone during exterior location measurements.
NOTE For further details giving the recommended test area configuration, see ISO 3744 and ISO 6393.
The ambient A-weighted sound pressure level due to sources other than the earthmoving machinery under test, including wind effects, shall be at least 10 dB lower than the lowest measurement of interest.
Measurements shall not be carried out when precipitation, e.g. rain, snow or sleet, is falling or when the ground is snow-covered. The ambient temperature shall be within a temperature range -10°C to +35°C.
NOTE For further details giving recommended climatic conditions, see IS0 6393.
The average wind speed at the test site shall be less than 8 m/s.Wind speeds at each measurement location due to machine operation should also be below 8 m/s. For measurement locations where wind speeds are above this value, sound measuring equipment designed for high wind applications should be used.
For testing, the equipment and attachment(s) for the most typical machine configuration as specified by the machine manufacturer shall be installed and in the carry position for travelling (see ISO 5006).The attachment position shall also be as specified by the manufacturer.
For testing at the location of the operator, an operator should be selected whose physical dimensions are as close as possible to a medium operator, and within the limits for a small to a large operator, as defined in ISO 3411.
The seat shall be positioned in the mid-position for fore and aft and for vertical height, if adjustment is provided. The seat and head rest, if present, shall be adjusted to accommodate the operator and shall remain consistent during the test series.
Other considerations for the operator station include eliminating non-typical machine noise such as radios and monitor alarms. For cab units, all windows and doors shall be closed. Cab interior materials and seals should be typical of the machine type and family.AS ISO 9533 pdf free download.

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