Larson Davis SoundTrack LxT, User Manual

Page: 187 / 307

16-2
Basic Sound Level Measurements LxT 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 16-1 "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). The symbol V represents the time weighting Fast,
Slow or Impulse.
1/1 and/or 1/3 Octave Frequency Spectra
The LxT can perform just 1/1 or 1/3 octave real-time
frequency spectra measurements or they can both be
measured simultaneously. These spectra are 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).
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
XVeq
Table 16-1 Sound Level Metrics Measured