Basic noise emission standardU.K.
EN ISO 3744:1995
Measurement surface/number of microphone positions/measuring distanceU.K.
Measurements at ground-levelU.K.
Hemisphere/6 microphone positions according to Part A paragraph 5/according to Part A paragraph 5.
Measurements carried out at jib-heightU.K.
Where the lifting mechanism is located at the jib-height, the measurement surface shall be a sphere of 4 m radius, the centre of which shall coincide with the geometrical centre of the winch
Where the measurement is carried out with the lifting mechanism on the jib stay of the crane, the area of measurement surface is a sphere; S is equal to 200 m2
The microphone positions shall be as follows (see figure 53.1):
Four microphone positions on a horizontal plane passing through the geometric centre of the mechanism (H = h/2)
with L = 2,80 m
and d = 2,80 - l/2
L = half-distance between two consecutive microphone positions
l = length of mechanism (along axis of jib)
b = width of mechanism
h = height of mechanism
d = distance between microphone support and mechanism in direction of jib
The other two microphone positions shall be located at the points of intersection of the sphere and the vertical line passing through the geometric centre of the mechanism