3.
Measurement Procedures
3.1 Assessment Point
12
determined by carrying out
Noise levels at the NSR shall be
measurements at the assessment point. The assessment point shall be
at a position 1 m from the exterior of the building facade of the
NSR, at a particular point considered appropriate by the Authority.
Where a measurement is to be made of noise being received at a NSR
which is not a building, the assessment point shall be at a position
1.2 m above the ground, at a particular point considered appropriate
by the Authority.
Where the noise under investigation is being received within a
building from a noise source located on or within the same or an
adjoining building such that the noise is transmitted primarily
through the structural elements of the building or buildings, the
internal assessment point shall be at a particular location which
the Authority considers appropriate having regard to the normal
occupancy of the building.
3.2 Noise Units and Descriptors
Any noise measurement to determine the MNL shall be made in terms of
the A-weighted equivalent continuous. sound pressure level (Leq)
measured with an integrating sound level meter set
to the "fast"
response. Such measurement shall be made over any 30 minute period,
which shall be taken to be the STP.
3.3 Rounding of Noise Levels
With the exception of the CNL which should be calculated to the
whole dB(A), with values of 0.5 or more being rounded
nearest
upwards, other measured or calculated
determined to the nearest 0.1 dB(A) or dB,
more being rounded upwards.
be
noise levels shall
with values of 0.05 or
3.4 Weather Conditions
Noise measurements should not be made in the
wind with a steady speed exceeding 5 m/s,
exceeding 10 m/s.
presence of fog,rain,
or wind with gusts