Fluke VIB 5.310, User Manual, Page: 111 / 173

4-16
Results
• Select ‘Third-octave bar’ or ‘Octave bar’ for the graph type.
• Set the ‘reference value’ needed to calculate the sound pressure
level (for example, for airborne sound p
0
= 20 µPa = 2 x 10
-5
Pa).
The reference value unit corresponds to the measurement quantity
set in the spectrum. The unit can only be changed for user-defined
quantities.
• Set a suitable evaluation filter (decibels (A),(B), (C) or (D)). If you
do not wish to evaluate the sound pressure level with a filter, set
‘decibel’.
• Then press the MENU button and click on ‘Save’.
The individual frequency bands (third-octaves, octaves) appear in
the sound spectrum, as does the overall sound level in a logarithmic
scale. The lower Info field specifies the sound pressure levels of the
individual bands. The cursor and zoom functions are not available in
this display.
Sound spectrum
Evaluated sound pressure
level in dB (A)

Note