Larson Davis 831, User Manual

Page: 151 / 548

7-16 Storing the Measurement Model 831 Manual
Highlight the file which is to be overwritten and press
5
.
This will replace the file name and number which previously
appeared with this one, as shown in FIGURE 7-15.
FIGURE 7-15 Overwriting a Saved File
To continue with the overwrite operation, highlight Yes and
press
5
.
To abort the overwrite operation, highlight No and press
5
.
To select a different previously saved file to overwrite,
highlight the box with the title “
... ” and press
5
to repeat
the overwrite procedure.
Low Level Sound Fields
As long as the sound level being measured is within the
measurement range shown in “Performance Specifications”
on page A-4, inherent (self-generated) noise and linearity
problems can be ignored.
It is possible to manually correct the measured RMS sound
pressure levels for the typical inherent noise levels (see the
noise floor specifications in “Performance Specifications”
on page A-4) as long as the difference between the measured
sound level and the inherent noise level is greater than 3 dB.
This is done by subtracting the inherent sound level from the
total sound level using the following formula.
where
orr 10 10
Lmeas
 
10

10
Linh
 
1

–

log =