3M SE, DL Conducting a level setup for STI-PA, Running a speech intelligibility study, Range

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Speech Intelligibility

Conducting a level setup (for STI-PA)

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 LAS when in stop mode. This is also called “survey mode”.

Stop mode

Range

Press up/down arrows to adjust the range values

Average decibel

Average dB level Displayed while in run or pause 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.

Models SE and DL