AS ISO 9533:2020 pdf Earth-moving machinery — Machine-mounted audible travel alarms and forward horns — Test methods and performance criteria

AS ISO 9533:2020 pdf Earth-moving machinery — Machine-mounted audible travel alarms and forward horns — Test methods and performance criteria
1  Scope
This International Standard specifies a static method for determining the sound output performance
and alarm activation requirements of audible travel alarms and forward horns mounted on earth-
moving machinery, as defined in ISO 6165, for operation on work sites and travelling on public roads. It offers objective test methodologies and performance criteria.
It is applicable only to those alarms and horns that are installed on the earth-moving machinery. It
does not specify the installation of one or more audible travel alarms or forward horns on particular
machines. It addresses neither the laboratory testing of warning alarm functionality nor durability.
NOTE  Earth-moving machine manufacturer’s practices, worksite requirements and local, national or regional regulations could require the fitting of the alarms or horns specified in this International Standard.
2  Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3411, Earth-moving machinery — Physical dimensions of operators and minimum operator
space envelope
ISO 6165, Earth-moving machinery — Basic types — Identification and terms and definitions
ISO 6746-1, Earth-moving machinery — Definitions of dimensions and codes — Part 1: Base machine
IEC 61672-1, Electroacoustics — Sound level meters — Part 1: Specifications
3  Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 machine reference box
MRB
imaginary rectangular box that would just fit over the base machine according to ISO 6746-1, which
excludes all equipment and attachment items such as buckets, dozers, backhoes, rippers and booms
3.2 audible travel alarm
machine-mounted audible alarm intended to warn or alert personnel of the potential hazard of the
machine travelling under its own power
3.2.1 travel warning alarm
audible signal intended to warn or alert personnel, especially those near a machine, that the machine has been activated to travel under its own power
Note 1 to entry: These alarms are normally associated with machines that have rotating upper structures.
3.2.2 reverse warning alarm
audible signal intended to warn personnel, especially those near the rear of a machine, that the machine has been activated to travel in a rearward direction under its own power
3.3 forward horn
audible signal activated by the operator of the machine intended to alert personnel near a machine, but especially near the front of the machine
Note 1 to entry: A forward horn or horns can also be used as part of a theft or security alarm system for the machine.
3.4 fixed sound level alarm
audible travel alarm that produces a sound level independent of ambient sound levels
3.5 self-adjusting sound level alarm
audible travel alarm that automatically adjusts its sound level, throughout a defined range, in order
to maintain a sound level differential between the output of the alarm and the ambient sound level
measured by the alarm
3.6 ambient sound
all sounds in the test area not produced by the audible travel alarm(s)
3.7 free field
space with no reflecting surface within 30 m of the sound source or microphone in any direction except for the horizontal reflecting plane on which the test machine is located
4  Apparatus
4.1 Sound level meter with an extension cable or equivalent sound measurement system that meets
the performance requirements of IEC 61672-1, Type 1.It is recommended that for the purposes of this International Standard all sound pressure level measurements be rounded to the nearest whole number in decibels.
4.2 Acoustical calibrator, or equivalent measurement system, recommended to be used each day of
measurement to calibrate the sound level meter prior to testing and for checking sensitivity drift after test completion. The effects of atmospheric pressure, temperature and use of a windscreen should be accounted for within the system calibration as recommended by the manufacturer of the instrumentation.