SoftdB Mezzo Sound Intensity Probe User manual

Mezzo Sound Intensity Probe

with Mezzo Intensity Analyzer Module

User Guide – 2022-02-17

Soft dB Inc.

1040,

Belvedere Avenue, Suite 215

Quebec (Quebec) Canada G1S 3G3

Toll free: 1

-866-686-0993 (USA and Canada)

E-mail: info@softdb.com

Contents

1Introduction.................................................................................................................................1

2Specifications...............................................................................................................................2

2.1 Mezzo Sound Intensity Probe............................................................................................................. 2

2.2 Mezzo Intensity Analyzer Module..................................................................................................... 3

3Setting up the Mezzo Sound Intensity Probe...........................................................................4

3.1 Mounting the microphones................................................................................................................ 4

3.2 Installing the windscreen .................................................................................................................... 5

4Setting up the Mezzo Intensity Analyzer Module ...................................................................6

4.1 Input Setup.............................................................................................................................................. 6

4.1.1 Retrieving Microphone Set Information from Mezzo Sound Intensity Probe.........6

4.1.2 Calibrating each microphone............................................................................................... 7

4.1.3 Selecting the Microphone Spacer.....................................................................................10

4.2 Selecting Data Type ............................................................................................................................11

4.3 Selecting the record directory..........................................................................................................12

5Performing a quick field check ............................................................................................... 13

6Performing a measurement .................................................................................................... 14

6.1 Method of measurement...................................................................................................................14

6.2 Step-by-Step Operation.....................................................................................................................15

7Analyzing Data ......................................................................................................................... 16

7.1 Theory.....................................................................................................................................................16

7.1.1 Sound Intensity vs Sound Pressure...................................................................................16

7.1.2 PI index.....................................................................................................................................17

7.1.3 Advanced Indicators.............................................................................................................18

Extraneous Sources.................................................................................................................18

P|I| index....................................................................................................................................18

Variability .................................................................................................................................18

7.2 Using the Mezzo Intensity Analyzer Module to analyze data..................................................19

8Exporting Data.......................................................................................................................... 20

9Viewing Measurement info..................................................................................................... 20

1Introduction

Congratulations on your purchase of the Mezzo Sound Intensity Probe. This instrument provides an

innovative and cost-effective solution for sound intensity measurements. More than just a DAQ

system, the DSP embedded in each MEZZO Intensity Probe ensures real-time signal processing.

Designed to be used with a tablet PC or any other Windows-based PC, the MEZZO Intensity Probe

benefits from the versatility and flexibility provided by computers. This approach allows the

MEZZO Intensity Probe along with the MEZZO Intensity Analyzer Module to be offered at a very

competitive price.

The current user’s manual describes the Mezzo Sound Intensity Probe hardware and its use

through the Mezzo Intensity Analyzer module.

2Specifications

2.1 Mezzo Sound Intensity Probe

Mezzo Sound Intensity Probe Specifications

Item Specifications

Microphones GRAS 40GK1

Intensity Processor IEC 61043 Class 1

Peak Maximum Level2 Low Range: 122 dBpk

High Range: 136 dBpk

Noise Level3 Low Range: 34 dBA, 32 dBC, 37 dBZ

High Range: 44 dBA, 42 dBC, 47 dBZ

Under-Range Limit Level4 Low Range: 44 dBA, 42 dBC, 47 dBZ

High Range: 51 dBA, 49 dBC, 54 dBZ

Maximum Sampling Rate 48 kHz

Signal Conditioning IEPE

Communication USB 2.0 (Mini B connector)

Dimensions 370 x 32 x 23 mm

Power Supply USB Powered (Max 0.35W)

Included Accessories

Component Description

Intensity Probe Mezzo Sound Intensity Probe with 40GK-26CB mic-set (12.5 mV/Pa, IEC 61043 (1993) Class 1)

USB Cable 3 m USB 2.0 cable with Mini B connector

Windscreen 190 x 100 mm elliptical windscreen

Case Plastic transport case Dimension: 450x395x115mm (17.75x15.5x4.5”)

140GK Mic with 26CB Preamp – 12.5 mV/Pa, IEC 61043 (1993) Class 1

2,3,4 Evaluated according to IEC 61672 (2013) Class 1, using 12.5 mV/Pa sensitivity.

2.2 Mezzo Intensity Analyzer Module

Module Specifications

Parameter Value

Available Data

Global levels and Spectrums (1/1 octave, 1/3 octave, 1/24 octave or FFT)

Frequency weighting : A,C and Z

Sound Intensity Level (Li),

Bandwidth

1/1 octave: 16 Hz to 16 kHz

1/3 octave: 12.5 Hz to 20 kHz

1/24 octave: 11.4 Hz to 22.1 kHz

FFT: 0 to 22 kHz

Data save Overall data is saved at the end of the measurement

Display All measured data (both live and overall) can be displayed during the acquisition.

Only the overall data can be viewed once the acquisition is completed

Miscellaneous Export the overall data to Excel.

Computer Requirements

Item Minimum Requirements

Operating System Windows XP SP3, Windows Vista, Windows 7, Windows 8

CPU Dual-Core at1.2 GHz3

Memory 2 GB RAM

Hard drive 300 MB free hard disk space

Port USB 2.0

Display resolution 800 x 600

3If using the 1/24 octave spectrum, the CPU requirement is Dual-Core at 2.4 GHz.

3Setting up the Mezzo Sound Intensity Probe

3.1 Mounting the microphones

1) Identify microphone 1 and 2 by looking at the serial numbers from the calibration

certificate;

2) Assemble the microphone 1 by using the right-angle preamplifier adapter;

3) Connect the microphone 1 to the cable labeled “1”;

4) Assemble the microphone 2 by using the straight preamplifier adapter;

5) Insert the microphone 2 in the microphone holder;

6) Connect the microphone 2 to the cable labeled “2”.

7) Select the appropriate microphone spacer corresponding to the frequency bandwidth of

interest. Refer to section 4.1.3, Selecting the Microphone Spacer, p.10 for more information.

8) Screw the spacer cup to mic 1 and the plastic spacer to mic 2.

9) Insert the plastic spacer in the metal cup by pressing the two microphones together.

Mic 1

Mic 2

3.2 Installing the windscreen

It is recommended to use the windscreen on the probe to limit effect of wind noise and also to

protect the probe.

4Setting up the Mezzo Intensity Analyzer Module

4.1 Input Setup

Click on the button from the “Setup” tab to enter the input setup:

4.1.1 Retrieving Microphone Set Information from Mezzo Sound Intensity Probe

Click on the “Mic Set” button:

Click on the “Load Info From Mezzo” to load the calibration information from the Mezzo Sound

Intensity Probe:

4.1.2 Calibrating each microphone

Click on the “Calibrate Mic A” button:

Enter the calibrator level and frequency.

Insert the microphone in the calibrator:

Turn ON the calibrator and click on “Run”

Click on “Stop” when level is stable

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