Sound Recording Range - Larson Davis SoundAdvisor 831C Reference Manual

While you can
TAKE NOTE
indicate the sound record up
to 9999 s, the actual time may
be limited by the sample rate
and the memory size.

18.7 Sound Recording Range

FIGURE 18-12

Sound Recording Range

Resolution
Peak Overload
FIGURE 18-13 Peak Overload
SoundAdvisor Model 831C
Step 6 Save. Select setup, Set to Active. Close.
Step 7 Run a measurement. The first 5 seconds, in this example,
will be recorded. Every stop followed by a run will have
another sound record.
Sound recordings are saved with 16-bit resolution which provides a
measurement range of ~90 dB. This means that it is capable of
recording sound signals with amplitudes no more than 90 dB below the
level at which the selected range will overload. When the overload level
is expressed in terms of peak level and the signal level as root-mean-
square (RMS), this range is actually 93 dB. Note, however, in practice
this lower limit is the internal noise floor of the instrument.
Before the meter can calculate the peak overload, the microphone type
must be set accurately. To ensure the correct microphone is set,
navigate Tools  Calibrate  Settings, see "Calibration" on
page 5-1.
You need the Peak Overload value to calculate the sound recording
range. Additionally, setting the gain at either 0 dB or 20 dB (Menu 
Setup Manager  SLM) and whether the range is set to normal or
high (Menu  Setup Manager  Sound), will result in different
values of upper and lower limits for any given microphone.
Sound Recording Range 18-8