Norsonic NOR150, Instruction Manual

Page: 108 / 216

92 Chapter 20
Building Acoustic
Figure 20.51
• L2 or L2’: average sound pressure level in the
receiving room (L2’ means it’s corrected for
background noise)
• Lb: average sound level pressure level of the
background noise in the receiving room
• Corr: applied correction values according to the
standard
The background noise correction can be activated or
de-activated in the
Rating Setup.
Measurements views 1 – 4
Use the soft key
Report
to switch to the measurement
data types. Alternatively, use the Project soft key to
jump back into the Project view, then select another
main group, and press the
VIEW
button. The
measurement types follow after the Rating type in this
order (Figure 20.51):
The different views are displayed by pushing the
VIEW
button.
NOTE! The first time a view is activated the
appearance is lagged due to the process of creating
the graphs.
Rating
Reverberation Source Background Receiving
The views for the reverberation time and the views for
the sound pressure levels are in principle the same. It
is only the unit and the scaling that is different.
For the reverberation time data use the FUNC key to
show the different RT functions (T
20
– T
30
– T
15
– EDT/T
max
).
IMPORTANT! This is just a display feature and has
no impact of the function used for the rating
calculation. The calculation will use the ‘Primary RT
function’ as specified in the
Reverberation Setup no
matter what is on your display.