AS ISO 6396:2020 pdf free.Earth-moving machinery—Determination of emission sound pressure level at operator’s position—Dynamic test conditions.
6.3.3 Microphone mounting
The microphone can conveniently be mounted on a frame or on the helmet, or on a shoulder harness worn by the operator.
6.3.4 Microphone vibration precautions
Care shall be taken to isolate the microphone from vibrations which could affect the measurements. If the microphone is moved during the measurements, care shall be exercized to avoid introducing acoustical noise (for example, noise due to the microphone rubbing against the operator’s clothing) or electrical noise (for example, due to a flexing cable) that could interfere with the measurements.
6.3.5 Precautions against microphone-reflected noise
6.3.5.1 Care shall be taken to minimize the effect of reflected noise which could affect microphone measurements. The recommendations given in 6.3.5.2 and 6.3.5.3 will minimize the effect of reflected noise.
6.3.5.2 Once the microphone location has been determined, a positional tolerance should be maintained of ± 50 mm from this location in any direction during the test.
6.3.5.3 The microphone should be placed a minimum of 100 mm from the side of the head and a minimum of 50 mm above the clothing on the shoulder during the test.
7 Set-up and operation of machine, and operator’s position set-up
7.1 Set-up and operation of machine
The set-up and operation of the machine shall be as specified in Iso 6395:2008, Clause 7.
Based on the type of machine, measurements are made in
— a travel mode,
— a stationary work cycle mode, or
— a combination of travel/stationary work cycle modes.
The positioning of the machine and travel length shall be as specified in ISO 6395:2008, 6.1 and 6.3. The
machine operation and travel path shall be as specified in ISO 6395:200 8, Annexes B to L.
7.2 Setting-up operator’s position for machines with cab
7.2.1 Cab with air-conditioning and/or pressurized ventilation system(s)
Measurements shall be taken with the doors and windows closed and the air-conditioning and/or ventilation system(s) in operation. If there is more than one operating speed available, the air conditioning and/or the pressurized ventilation system(s) shall be operated at the second speed for systems with up to four speeds.
For systems with more than four speeds, the third speed shall be used and, for systems with infinitely variable speeds, the mid-range speed.
If the air-conditioning and/or ventilation systems have a recirculate and outside air position control, the control shall be set for outside air.AS ISO 6396 pdf download.