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103 Speech Intelligibility
Conducting a level setup (for STI-PA)
Models SE and DL
Conducting a level setup (for STI-PA)
• From a fixed-point, measure the A-weighted Sound Pressure Level of your
mass notification system (or alarm system). When in the STI-PA screen,
adjust the range as needed via the Up/Down Arrows.
• The average dB level is displayed when in stop mode.
NOTE: the instrument will display the L
AS
when in stop mode. This is
also called “survey mode”.
Figure 6-20: Level set-up and average decibel level
Running a speech intelligibility study
Before proceeding with a STI-PA measurement, ensure you calibrated the
Verifier and conducted a Sound Level setup.
NOTE: if there is impulsive noise present, it is best to capture the background
noise (via the Captured Curve pop-menu), remove the noise, or come back later
when the noise is not present. That is because impulsive noise and strong
voices can skew the measurement results. If you captured the background
noise, you would then come back when the noise is not present and apply the
captured curve during a STI-PA measurement. (See “Applying captured curves
for STI-PA testing for more details, on page 106.)
The following instructions explain how to run, pause, and stop a STI-PA study
without captured curves. (If you wish to take a background noise sample, also
called “captured curves see “Applying captured curves for STI-PA testing” for
more details, 106.)
NOTE: it is optional to organize your measurements into Sessions & Studies.
How to run a STI-PA study?
1. The SoundPro should be powered on and you should be viewing the STI-
PA measurement screen.
Average dB level
Displayed while in run
or pause mode
Average
decibel
Stop mode
Range
Press up/down
arrows to adjust
the range values