24-2 Basic Sound Level Measurements Model 831 Manual
RMS Averaging
The exponential averaging time for RMS sound levels is set
to one of the following:
•Slow
•Fast
An impulse detector is also available.
Sound Level Metrics Measured
In Table 24-1 "Sound Level Metrics Measured" the symbol
X is used to represent the user-selected RMS and Impulse
frequency weighting (A, C or Z) and the symbol Y is used to
represent the user-selected peak frequency weighting (A, C
or Z).
1/1 and/or 1/3 Octave Frequency Spectra
The Model 831 can perform just 1/1 or 1/3 octave real-time
frequency spectra measurements or they can both be
measured simultaneously. These spectra will be made using
a user-selected frequency weighting (A, C or Z). The
averaging time is the same as that selected for the sound
level measurements (Fast, Slow or Impulse).
Spectral data is displayed on both the Live and Overall tabs,
but only the Overall Data can be stored.
Selected RMS
Averaging
Metric Fast Slow Impulse Peak Integrated
Instantaneous Sound Level L
XF
L
XS
L
XI
L
Ypeak
Maximum Sound Level L
XFmax
L
XSmax
L
XImax
L
Ypeak(max)
Minimum Sound Level L
XFmin
L
XSmin
L
XImin
Equivalent Level L
XIeq
L
Xeq
Table 24-1 Sound Level Metrics Measured
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