3M DL Conducting a STI-PA test overview of steps, STI-PA setup, Measures Explanation Setup screen

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Speech Intelligibility

Conducting a STI-PA test (overview of steps)

Conducting a STI-PA test (overview of steps)

1.Calibrate the SoundPro.

2.Set-up your STI-PA options via the” Measures” setup screen. (Select the measurement type as STI-PA.)

3.A level setup is conducted. From a fixed-point, the technician measures the A-weighted SPL of MNS message (or alarm system). The test signal volume should approximately match the MNS message volume. (You would adjust the test signal to match the LAS value.)

4.The test signal is played through buildings voice system (PA system).

5.The technician/sound tester positions himself/herself in “zones”/building areas.

•It is recommended to design a map of “zones”(or rooms) to indicate where you will be taking your measurements.

•Set measuring range appropriately.

6.STI-PA measurement is conducted. Press the Run/Pause key to start the study.

NOTE: If you want to post-process your intelligibility measurements with previously captured background noise, you would first capture curves and then apply this during your study.

7.After a 15-second countdown, either a STI or CIS level is displayed with a pass/fail message.

8.The technician/sound tester moves throughout the building and measures in all zones/rooms.

NOTE: A zone/room is typically a room 20x20. More than one measurement may be required if the room exceeds this size.

9.The tests are noted as pass/fail.

NOTE: the past tests can be reviewed and loaded via the File System screen.

STI-PA setup

The following table explains all of the parameters found in the measures setup screen.

Measures	Explanation
setup screen
Scale type field	Select either STI scale or CIS scale. (Please refer to Chapter 1, “STI
	scale or CIS scale”)
Gender field	The voice can be set according to the test signal being use, male or
	female voice. NOTE: the Verifier default setting is Male. If using the
	test signal supplied by 3M, this uses a male test signal; so; you will
	not have to change this field if you only use the male test tone signal.

Models SE and DL