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TSI Instruments OmniTrak 7591-09 Manual
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TSI Instruments OmniTrak 7591-09 Manual

TSI Instruments OmniTrak 7591-09 Manual

Sound level meter (slm)
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OmniTrak
Level Meter (SLM)
Model 7591-09
User Manual
P/N 6017972, Revision A
April 2025
NOTICE
Read this manual before using
the equipment.
Retain this manual for future use.
www.tsi.com
TM
Sound

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  • Page 1 OmniTrak Sound Level Meter (SLM) Model 7591-09 User Manual P/N 6017972, Revision A April 2025 NOTICE Read this manual before using the equipment. Retain this manual for future use. www.tsi.com...
  • Page 2 Start Seeing the Benefits of Registering Today! ® ® Thank you for your TSI instrument purchase. Occasionally, TSI releases information on software updates, product enhancements and ® new products. By registering your instrument, TSI will be able to send this important information to you. http://register.tsi.com As part of the registration process, you will be asked for your comments on TSI products and services.
  • Page 3 Manual History Revision Date April 2025...
  • Page 4 (This page intentionally left blank)
  • Page 5 Warranty Part Number 6017972 / Revision A Copyright ©TSI Incorporated / 2025 / All rights reserved. Address TSI Incorporated / 500 Cardigan Road / Shoreview, MN 55126 / USA Fax No. 651-490-3824 E-mail Address technical.services@tsi.com Limitation of Warranty and Liability (effective May 2024) (For country-specific terms and conditions outside of the USA, please visit www.tsi.com.) Seller warrants the goods, excluding software, sold hereunder, under normal use and service as described in the operator’s manual (version published at the time of sale), to be free from defects in workmanship and material for the...
  • Page 6 TO THE EXTENT PERMITTED BY LAW, THE EXCLUSIVE REMEDY OF THE USER OR BUYER, AND THE LIMIT OF SELLER'S LIABILITY FOR ANY AND ALL LOSSES, INJURIES, OR DAMAGES CONCERNING THE GOODS (INCLUDING CLAIMS BASED ON CONTRACT, NEGLIGENCE, TORT, STRICT LIABILITY OR OTHERWISE) SHALL BE THE RETURN OF GOODS TO SELLER AND THE REFUND OF THE PURCHASE PRICE, OR, AT THE OPTION OF SELLER, THE REPAIR OR REPLACEMENT OF THE GOODS.
  • Page 7 Warnings, Safety Markings, Best Practices and Compliance. Safe Operation W A R N I N G Repair and battery replacement must be done by authorized service personnel only. The OmniTrak Sound Level Meter (also referred to as SLM) will not present a safety risk when you use it as instructed in this User Manual.
  • Page 8 Servicing and Troubleshooting C A U T I O N The OmniTrak SLM contains no user serviceable parts. If a fault is ® ® suspected, return the instrument to TSI or a TSI approved service center. Battery Care C A U T I O N The OmniTrak SLM operates from batteries (or optional mains power).
  • Page 9 Using Near Water C A U T I O N The OmniTrak™ SLM is not waterproof. DO NOT immerse the instrument in water or use it in the rain. Using Near Heat C A U T I O N DO NOT exposure the OmniTrak SLM to high temperatures.
  • Page 10 Owner Responsibilities C A U T I O N The owner of the instrument must make sure that: The instrument is operated within its intended use. ◼ Operators follow all operational recommendations. ◼ Operators never attempt to service parts of the instrument. All system ◼...
  • Page 11 Disclaimer DO NOT use the OmniTrak SLM until you have thoroughly familiarized yourself with this ® manual or have been instructed by a TSI engineer. At the time of writing, this manual was up to date but due to continual improvements the final operating procedures may differ slightly from those in the manual.
  • Page 12 Avertissements, marques de sécurité, meilleures pratiques et conformité Sécurité de fonctionnement A V E R T I S S E M E N T La réparation et le remplacement de la batterie doivent être effectués par du personnel de service autorisé uniquement. Le sonomètre OmniTrak™...
  • Page 13 Positionnement A T T E N T I O N Pour satisfaire aux exigences d’exposition aux radiofréquences, ce dispositif et son antenne peuvent être utilisés près du corps d’une personne et de ses extrémités, mais doivent être actionnés à une distance d’au moins 20 cm de la tête de toute personne.
  • Page 14 A T T E N T I O N Après utilisation, chargez le sonomètre OmniTrak™ avant de le conserver ◼ pendant une période prolongée. Il est préférable de ne pas stocker le sonomètre OmniTrak™ pendant une période de temps dans un état de batterie faible.
  • Page 15 Précautions du personnel d'exploitation A T T E N T I O N Suivez ces instructions pour utiliser l'instrument en toute sécurité. Sinon, cela peut entraîner des blessures ou d'endommager l'instrument. Responsabilités du propriétaire A T T E N T I O N Le propriétaire de l'instrument doit s'assurer que : L'instrument est utilisé...
  • Page 16 Conformité Contient ID FCC : 2A22JTSIBLE23 Contient ID IC : 28101-TSIBLE23 Cet appareil est conforme à la partie 15 des Règles de la FCC. L'exploitation est soumise aux deux conditions suivantes : Cet appareil ne peut pas provoquer d'interférences nuisibles. ◼...
  • Page 17 (This page intentionally left blank) Warnings, Safety Markings, & Standard Information xvii...
  • Page 18 About this Manual Intended Purpose This document is intended for use by personnel to effectively operate and maintain the OmniTrak Sound Level Meter (SLM). Conventions This document uses the following conventions: Convention Meaning For more information, see This section A cross-reference to a related or more detailed topic. Safety Notices This document uses the following safety notice conventions: W A R N I N G...
  • Page 19 Avis de sécurité Ce document utilise les conventions suivantes relatives aux avis de sécurité : A V E R T I S S E M E N T Indique une situation dangereuse qui, si elle n'est pas évitée, pourrait entraîner des blessures graves au personnel ou des dommages à...
  • Page 20 Contents Manual History ........................iii Warranty ........................... v Warnings, Safety Markings, Best Practices and Compliance.......... vii Safe Operation ........................vii Handling ..........................vii Positioning .......................... vii Servicing and Troubleshooting ..................viii Battery Care ........................viii Using Near Water ........................ ix Using Near Heat ........................
  • Page 21 Contents ..........................xxi List of Figures ........................xxiv List of Tables ........................xxv CHAPTER 1 Product Description ..................1-1 What is Sound Level Monitoring? ..................1-1 The OmniTrak™ Solution ....................1-2 Computer Requirements ....................1-3 Hardware Components ....................1-3 Connections ........................1-4 OmniTrak Smart Station ...................
  • Page 22 Adding Measurement Parameters to the Sensor Data View on the Smart Station ......................3-12 How to Edit a Study ....................3-13 How to upload to TSI Link ..................3-14 How to Create a CSV File ..................3-14 How to Delete a Study ....................3-15 Viewing Previously Recorded Studies ................
  • Page 23 Center Frequency ..................... 7-1 Criterion Level ......................7-1 Decibel (dB) ......................7-2 Dose .......................... 7-2 Dynamic Range ......................7-2 Exchange Rate (ER– also known as the Doubling Rate) ......... 7-3 Field Calibration (vs. Factory Calibration), Pre-calibration, Post-calibration ......................7-3 Lavg (Average Level) ....................7-3 Leq (Equivalent Level) ....................
  • Page 24 2-2. Unpacking the SLM Module .................... 2-2 2-3. Smart Station USB-C Port Location ................2-2 2-4. SLM Module USB-C Port Location ................. 2-3 2-5. SLM Module Charging Indicators ..................2-4 2-6. Smart Station Power On/Off Button ................2-5 2-7. SLM Module Connection Indicator .................. 2-6 2-8.
  • Page 25 3-1. Battery Life of Components .................... 3-2 A-1. RMS Frequency Weightings ................... 4-4 B-1. Acoustic Frequency Response Testing ................5-2 B-2. Linear Operating Range ....................5-2 B-3. Self-Generated Noise ..................... 5-3 B-4. OmniTrak™ SLM with CEL-252 Microphone Free Field Response and Effects of Wind Screen ....................
  • Page 26 (This page intentionally left blank) Contents xxvii...
  • Page 27 CHAPTER 1 Product Description What is Sound Level Monitoring? Measuring sound levels in the workplace is an important element of hearing conservation and noise reduction programs. Sound level monitoring allows you to record and then analyze sound data over a period of time to determine if noise reduction actions need to be put into place to comply with local regulations.
  • Page 28 The OmniTrak™ Solution ’s OmniTrak™ Sound Level Meter (SLM), you can assess and determine a worker’s ® With TSI daily exposure to sound levels quickly and easily. The information recorded can be used to ensure compliance with regulatory bodies or to ensure if hearing conservation programs are needed.
  • Page 29 Computer Requirements You need to meet the following minimum computer requirements if you intend to download data onto your computer: ® Windows 10 operating system or above ◼ One (1) available USB-C port or an internet connection ◼ Hardware Components This table below shows the components that make up the OmniTrak Sound Level Meter.
  • Page 30 Connections Connection ports for both the Smart Station and the Sound Level Meter module are on the underside of each component and are shown in the following sections. OmniTrak Smart Station The OmniTrak Smart Station has one USB-C port on its underside. This is used to connect to your computer to both download data and to charge the battery.
  • Page 31 Sound Level Meter Module The OmniTrak Sound Level Meter (SLM) module has connection ports shown in Figure 1-3. The table underneath describes their use. Figure 1-3. SLM Module Connection Ports Part Description Battery charging indicators Latch points for physical connection to the Smart Station Port used to connect diagnostics and programming equipment USB-C port used to charge the module Product Description...
  • Page 32 Smart Station Display and Navigation Controls The OmniTrak SLM Smart Station user interface uses touch screen technology. You need to tap the display options to select them. The only physical button is the power on/off button. Press the power button on the right side of the Smart Station to turn on the device. When the instrument has completed the boot up process, the OmniTrak home screen is displayed.
  • Page 33 Item Type Description More information Indicator Time provided by the network or set by Adjusting the Date and the operator. Time Indicator A USB-C connection to a computer is present. This is not displayed if the USB-C port is not connected to the USB-C port of your computer.
  • Page 34 Navigation Drawer Menu Items The navigation drawer icon ( is used to access the following items: Table 1-2. Navigation Drawer Menu Items Item Description Sensor Data Used to display live data being directly sent from the module in the data display window.
  • Page 35 Study Manager Window The Study Manager window is used to access previously recorded study files. These are listed vertically. The following attributes are displayed: The name of the study ◼ The date and time the study was recorded ◼ The duration of the study ◼...
  • Page 36 You can search for a study by name, list files by ascending or descending study name or age using the following selections: Study Name Sorts alphabetically (A-Z) (asc.) Study Name Sorts alphabetically (Z-A) (desc.) Timestamp Sorts by age (earliest to latest) (asc.) Timestamp Sorts by age (latest to...
  • Page 37 You can configure the following parameters: Table 1-3. Settings Window Configurable Items Item Description Date and time Set the following: Network provided time, GPS-provided time, or a custom time. ◼ Time zone. ◼ Time format (12- or 24-hour). ◼ ® Do the following: Wi-Fi connectivity...
  • Page 38 The Smart Station (model, serial number, firmware version ◼ and battery level). NOTICE You can edit the name by touching the pencil icon The module [serial number, user calibration date and time ◼ and user calibrated result (pass or fail))]. Calibrate Used to access the calibration process.
  • Page 39 Numeric/Graphical Display Drop-Down The Numeric / Graph drop-down allows you to switch between the default numeric display and a graphical display. When the data is being displayed graphically, you can turn the instrument sideways to enable a landscape view. In the graphical display mode, you can choose which measurement parameter to display by selecting it from the ellipsis icon.
  • Page 40 SLM Module Display On the front of the Sound Level Meter module there is an LED indicator on the bottom left (1). This indicates various connection and battery states as described in the table. Figure 1-12. SLM Module Display Table 1-4. SLM Module LED Indicator Meanings LED status Meaning Red flashing...
  • Page 41 CHAPTER 2 Getting Started This chapter guides you through the steps to take before you begin to record your studies. Unpacking the Smart Station and Accessories 1. Open the box in which your Smart Station was delivered. 2. Remove the Smart Station unit. 3.
  • Page 42 Unpacking the Sound Level Meter Module and Accessories 1. Open the box in which your Sound Level Meter (SLM) module was delivered. 2. Remove the SLM module. 3. Remove the inner white cardboard to access the product information sheet, USB-C cable, registration card and service information card.
  • Page 43 2. Insert the other end of the USB-C cable to a suitable USB-C charging port, for example your computer. NOTICE An ideal power source is 5 VDC, 2 Amp, 10 Watt. The Smart Station can be charged in either on or off states. The battery level is indicated on the front screen.
  • Page 44 The LEDs on the bottom of the SLM adjacent the USB-C port show different charging states. Figure 2-5. SLM Module Charging Indicators States Green flashing: battery is charging. Green solid: battery is fully charged. Yellow solid: power is connected. T I P ®...
  • Page 45 Powering Up the Smart Station On the right side of the Smart Station, press and hold the button for approximately 2 to 3 seconds. ® The TSI logo on a white background is displayed. This is the boot screen. When the instrument has completed the boot up process, the OmniTrak home screen is...
  • Page 46 Powering up the Sound Level Meter Module On the left side of the SLM module, press and hold the button for 2 seconds. Figure 2-7. SLM Module Connection Indicator The LED on the front of the Sound Level Meter module flashes blue (approximately twice every ®...
  • Page 47 Attaching and Detaching the SLM Module to the Smart Station To attach the SLM module to the Smart Station: 1. Make sure the LED indicator on the SLM module is facing the same side as the Smart Station touch screen. 2.
  • Page 48 To detach the SLM module from the Smart Station: 1. Support the Smart Station in one hand and the SLM module in the other. 2. Gently push the two button latch releases on either side of the Smart Station (near the top).
  • Page 49 4. The LED on the front of the SLM module changes from flashing blue to flashing green (once every 5 seconds). NOTICE You are asked if you would like to calibrate the module you have just paired to. To do so, touch CALIBRATE (for more information see Calibrate your OmniTrak Sound...
  • Page 50 7. Touch DONE. NOTICE ® You can access further Wi-Fi settings by touching SEE MORE. Adjusting the Date and Time Setting the appropriate date and time is important in order to record the correct timestamps for your studies. By default, the Smart Station time automatically updates the date and time when ®...
  • Page 51 Setting the Noise Configuration The OmniTrak Sound Level Meter is capable of measuring, recording and storing a wide range of sound level parameters. You can choose from a selection of industry standards, or customize your own. The standards available are: OSHA HC ◼...
  • Page 52 4. In the Measurement Parameters section of the window, touch the checkboxes adjacent the parameters you want to include in your configuration. 5. Touch SAVE. NOTICE If any required parameter values have been omitted, you are asked to add them. ◼...
  • Page 53 Figure 2-13. Live Measurements (graphical display landscape) Installing and Enabling the TSI Link™ Report Creator Add-in ® ® The TSI Link Report Creator lets you access Microsoft Excel templates for your study, including graphs and smart visualizations, and saves time by simplifying data analysis and reporting.
  • Page 54 NOTICE ® You will need a Wi-Fi network connection to log into your account. For more ® information, see Connecting the Smart Station to a Wi-Fi Network. ® If you select Profile without a Wi-Fi network connection, you are prompted to enable one.
  • Page 55 To log on to your TSI Link account: ® ® 1. In Microsoft Excel spreadsheet program, ® select the TSI Report Creator icon. The TSI Link task pane is displayed. 2. Select GET STARTED. You are prompted to enter your account credentials.
  • Page 56 CHAPTER 3 Operations Onboarding Checks on First Use When you use the OmniTrak Sound Level Meter for the first time, you will need to complete a series of “onboarding” steps to set up parameters for future use. Chapter 2. Getting Started describes how to do these.
  • Page 57 Checking Battery Power Typically, the battery life of the OmniTrak Sound Level Meter components are listed in Table 3-1. Table 3-1. Battery Life of Components Component Battery life Smart Station Up to 14 hours (with the display brightness at 100%) Sound Level Meter module Up to 12 hours Appendix A.
  • Page 58 To check the battery level of an SLM: 1. In the Smart Station home screen, touch the blue computer mesh button . A list of sensors within range of the Smart Station is displayed. 2. Touch the ellipsis menu to the right of a sensor name, and touch Information. The battery levels for the sensor you are paired with is displayed.
  • Page 59 Viewing and Capturing Data With the OmniTrak Sound Level Meter, you can see levels of sound data being sent from the module to the Smart Station on screen. You can view this either as a numerical value, or as a graphical chart display over a period of time.
  • Page 60 T I P When viewing data graphically, you can turn the instrument into a landscape position to enable a landscape view (see Figure 2-13). NOTICE The data shown graphically is over a period of time starting from when the module was paired and ending when the module is disconnected. The graphical data will only be logged when a study is being recorded.
  • Page 61 How to Create a Study Figure 3-4 shows the process you follow to successfully record a study. Figure 3-4. Study Creation Process OmniTrak Sound Level Meter...
  • Page 62 There are two options to start recording your study: Quick Start Study ◼ Starts a recording immediately using the default configuration or the configuration used on the last recording. This study will include all modules (up to 3 SLM modules plus other modules) paired with the Smart Station.
  • Page 63 The acoustic calibrator has either a 94 dB or 114 dB output. Each output is indicated on the underside of the calibrator and the selected output level has a blue flashing LED adjacent to it. 2. Fit the acoustic calibrator firmly over the module microphone. Figure 3-6.
  • Page 64 5. In the Smart Station window, touch CALIBRATE. 6. In the Calibration window, check the calibration reference level. Make sure it is set to the correct level (94.0 dB or 114.0 dB). Touch the pencil icon to edit it. NOTICE The CALIBRATE button is grayed out until the correct value is entered.
  • Page 65 To perform a manual calibration from the Smart Station Sensor Data window: 1. From the Sensors window, touch the ellipsis icon 2. From the drop-down list, touch Calibrate. To perform a manual calibration from the Smart Station Sound Study window: 1.
  • Page 66 6. Touch STOP. The Save Quick Start Study window is displayed. 7. Enter the study name and optional location and notes details in the displayed fields. 8. Touch SAVE. Your study is saved. Recording a Study with a Different Configuration 1.
  • Page 67 Adding Measurement Parameters to the Sensor Data View on the Smart Station When a study is running, you can view different measurements within the chosen configuration to view in the data display window. NOTICE This applies to studies running in the numeric view only. 1.
  • Page 68 Those parameters checked are shown in the data display window. Figure 3-15. Displayed Measurement Parameters How to Edit a Study For each and every study recorded, you can edit: The study name ◼ The study location ◼ The notes associated with that study. ◼...
  • Page 69 How to upload to TSI Link TSI Link is software that allows you to send and receive study data to and from your TSI Link account. Using that account, you can use TSI Link Report Creator to access ® ® Microsoft Excel templates for your study, including graphs and smart visualizations, and to...
  • Page 70 How to Delete a Study You can delete any number of study files at any time. You may want to delete old studies or ones you have exported to save space on the Smart Station hard drive. To delete a study on the Smart Station: 1.
  • Page 71 To view study data on the Smart Station: 1. Touch the navigation drawer icon to display the top-level menu items. 2. From the drop-down list, touch Study Manager. A list of previously recorded study files is displayed. 3. Touch the ellipsis menu to the right of a study name, and touch View.
  • Page 72 To enable Airplane mode: 1. Touch the navigation drawer icon to display the top-level menu items. 2. From the drop-down list, touch Settings. 3. Touch WI-FI. The Internet Connectivity window is displayed. ® 4. Under Airplane mode, touch the slider icon to enable airplane mode. Wi-Fi is disabled.
  • Page 73 Updating the Smart Station Software ® Occasionally, TSI releases software updates and these can be applied by following some simple steps. To update the software: 1. Touch the navigation drawer icon to display the top-level menu items. 2. From the drop-down list, touch About. If a software update is available, you will see an update message in the About screen.
  • Page 74 Changing the Name of a Module You can change the name of any of the SLM modules connected to the Smart Station. To change the name of a SLM module: 1. In the Smart Station home screen, touch the blue computer mesh button .
  • Page 75 6. Make your changes and touch SAVE. The selected configuration carries forward your changes. To delete a customized noise configuration: 1. Touch the navigation drawer icon to display the top-level menu items. 2. From the drop-down list, touch Settings. 3. Touch NOISE CONFIG. The Noise Configuration window is displayed. 4.
  • Page 76 (This page intentionally left blank) Operations 3-21...
  • Page 77 APPENDIX A Specifications* *All specifications are subject to change without notice. Standards ▪ IEC 61672-1: 2013 ▪ ANSI/ASA S1.4-2014/Part 1 Mechanical Characteristics Housing ........ POLYCARBONATE - Flame Retardant (UL94-V0) for SLM Module Size (W x H x D) ....83 mm x 333 mm x 37.5 mm (3.27 in. x 13.11 in. x 1.48 in.) (Dimensions include microphone and Smart Station) Weight ........
  • Page 78 Installation Requirements Overvoltage Category ..CAT II Stabilization Time ....5s after unit has powered on. Operating Temperature ..0°C to 40°C (For Class 2 requirements) Charging Temperature..5°C to 40°C Storage Temperature... 0°C to 60°C Operating Barometric Pressure Range ....65 kPa to 108 kPa A.C.
  • Page 79 Measurement Parameters and Specifications LXY, LXYmax (+ time), Where X is the frequency weighting A, C or Z and Y LXYmin (+ time), LXeq, represents time weighting Fast (F), Slow (S) or Impulse (I). LXpeak (+ time), Lavg, All weightings simultaneously measured where appropriate. LAIeq, LAEQT80, LAFTmn, For Taktmaximal parameters, n represents 3 or 5.
  • Page 80 RMS Frequency Weightings A, C and Z filter weightings satisfying IEC 61672-1:2013 Class 2. Table A-1. RMS Frequency Weightings Frequency Weighting Nominal Frequency (Hz) -70.4 -14.3 12.5 -63.4 -11.2 -56.7 -8.5 -50.5 -6.2 -44.7 -4.4 31.5 -39.4 -3.0 -34.6 -2.0 -30.2 -1.3 -26.2...
  • Page 81 (This page intentionally left blank) Specifications...
  • Page 82 APPENDIX B Additional Requirements Needed for IEC61672-1, Section 9.3 *All specifications are subject to change without notice. Reference Sound Pressure Level The reference sound pressure level is 114 dB. Reference Level Range The OmniTrak Sound Level Meter (SLM) is a single level range instrument of 40 to 140 dB. Microphone Reference Point The microphone reference point is the center of the diaphragm of the microphone.
  • Page 83 Acoustic Frequency Response Testing The pressure to free field correction data for the OmniTrak SLM microphone used for periodic testing. Table B-1. Acoustic Frequency Response Testing free Field Free Field Corrections with Wind Expanded Corrections using Screen using a Uncertainty of a Bruel &...
  • Page 84 Self-Generated Noise Combination of CEL-252 microphone thermal noise and meter electrical noise. Table B-3. Self-Generated Noise Electrical Combined Weighting Typical dB Typical dB 22.1 23.7 21.7 42.6 29.1 52.3 Highest Level The highest sound pressure level designed to be measured by the OmniTrak SLM sound level meter is 140 dB.
  • Page 85 Electric Field Strength Greater than 10 V/m The OmniTrak SLM has not been tested for field strengths greater than 10 V/m. EMC Emissions Emissions were no greater in any one plane or any mode of operation. EMC Susceptibility The OmniTrak SLM has slightly higher susceptibility with the Y plane facing the radiating antenna.
  • Page 86 OmniTrak SLM with CEL-252 Microphone Free Field Response and Effects of Wind Screen Table B-4. OmniTrak™ SLM with CEL-252 Microphone Free Field Response and Effects of Wind Screen Case Expanded Frequency Effect Expanded Windscreen UC (k=2) Exact (Hz) (dB) UC (k=2) Effect (dB) (dB) 63.096...
  • Page 87 OmniTrak SLM with CEL-252 Microphone Directional Response (dB) Relative to Zero Degrees Orientation of OmniTrak SLM - Display at 0 degrees relative to ground. Table B-5. Directional Response (dB) Relative to Zero Degrees, Horizontal Plane (Display at 0 Degrees Relative to the Ground) Unit with CEL 252 microphone, Directional response relative to on axis response, dB Freq, 0°...
  • Page 88 Table B-6. EMC Susceptibility Directional Response (dB) Relative to Zero Degrees, Display at 0 Degrees Relative to the Ground Orientation of OmniTrak SLM - Display at 90 degrees relative to ground. Table B-7. Directional Response (dB) Relative to Zero Degrees, Vertical Plane (Display at 0 Degrees Relative to the Ground) Unit with CEL 252 microphone, Directional response relative to on axis response, dB Freq, Hz...
  • Page 89 Sound Calibrators – Level Correction Sound level calibrators apply sound pressure to a microphone in a closed cavity. The response of a microphone in a free field at 1 kHz will be slightly different to that of a pressure field. However, in this case the difference (when rounded to 0.1 dB resolution) is 0.0 dB. Also some calibrators are affected by the volume of the microphone changing the volume of the calibrator cavity.
  • Page 90 (This page intentionally left blank) Additional Requirements Needed for IEC61672-1, Section 9.3...
  • Page 91 APPENDIX C Noise Parameter Definitions Parameter Definition The Sound Level with “A” Frequency weighting and Fast Time weighting. The Sound level with “C” Frequency weighting and Fast Time weighting. The Sound level with “Z” Frequency weighting and Fast Time weighting. The Sound Level with “A”...
  • Page 92 Parameter Definition The maximum Sound level with “C” Frequency weighting and Impulse Time CImax weighting during the measurement period. The maximum Sound level with “Z” Frequency weighting and Impulse Time ZImax weighting during the measurement period. The minimum Sound Level measured with “A” frequency weighting and Fast AFmin Time weighting during the measurement period.
  • Page 93 Parameter Definition The Time Averaged Sound Level with an exchange rate other than 3dB. The Time Averaged Sound Level with an exchange rate other than 3dB. The Peak Sound pressure level with “A” frequency weighting. The Peak Sound pressure level with “C” frequency weighting. The Peak Sound pressure level with “Z”...
  • Page 94 Parameter Definition Proj. TWA Projected TWA over a standard 8 hour working day. (8Hr) Dose % The % dose. Proj. Dose The % dose projected forwards over an 8 hour period. Projected Defaults to 8 (can be set to any value from 01:00 to 24:00 (HH:MM) for Work custom setup) Duration...
  • Page 95 APPENDIX D Glossary of Terms LC-LA The C-A measurement is an average that enhances the low-frequency components of the sound signal. It is the result of subtracting an A-weighted average from a simultaneously collected C-weighted average and is sometimes used as the NRR (noise reduction rating) or HML methods to determine if hearing protection devices are adequate for usage in the field.
  • Page 96 Decibel (dB) Sound Level Meters use the decibel as the unit of measure known as Sound Pressure Level (SPL). SPL uses the ratio between a reference level of 20 microPascals (.00002 Pascals) and the level being measured. SPL = 20 log (measured level/reference level) Example: The SPL for 1 Pascal is 20 log (1 Pascal/.00002 Pascal) = 94 dB 20 microPascals (.00002 Pascals) is considered the average threshold of hearing.
  • Page 97 Exchange Rate (ER– also known as the Doubling Rate) Also known as the Doubling Rate, this refers to how the sound energy is averaged over time. Using the decibel scale, every time the sound energy doubles, the measured level increases by 3 dB.
  • Page 98 Leq (Equivalent Level) The true equivalent sound level measured over the run time. The term L_ is functionally the same as L_ except that it is only used when the Exchange Rate is set to 3 dB and the threshold is set to none. Logging Also called Data Logging.
  • Page 99 Projected Work Duration A time interval used in some calculations, usually different from the actual run time of a study or session. The overall exposure time, manually inputted, with which to calculate daily dose values. Reference pressure The sound pressure at the threshold of human hearing, as measured under standard conditions.
  • Page 100 Figure D-3. Fast Response to a Tone Burst RMS (Root Mean Square) The RMS voltage of a signal is computed by squaring the instantaneous voltage, integrating over the desired time, and taking the square root. Simply put, the RMS values are the results from the meter with the response time and weighting settings taken into account.
  • Page 101 Sound pressure level. A ratio of one sound pressure to a reference pressure (See Reference Pressure). Because of the enormous dynamic range of the human ear, the ratio is calculated logarithmically by the formula below, where L is the reference pressure. ...
  • Page 102 Example 2: If the work shift is 6.5 hours long, then measure for the entire 6.5 hours. TWA is the correct level to report to OSHA. It does not have to be modified.  RTIM E  L ER – Under Range (UR) An under range will occur whenever the input signal is lower than the noise floor in the dynamic range of the instrument.
  • Page 103 Windscreen A windscreen is a covering for the microphone that reduces disturbances caused by wind and direct contact with other surfaces. The windscreen is placed over the microphone when taking measurements to help prevent false high readings due to wind blowing across the microphone or objects (hair, clothing, etc.) brushing against the microphone.
  • Page 104 (This page intentionally left blank) D-10 OmniTrak Sound Level Meter...
  • Page 105 TSI Incorporated – Visit our website www.tsi.com for more information. Tel: +1 800 680 1220 India Tel: +91 80 67877200 Tel: +44 149 4 459200 China Tel: +86 10 8219 7688 France Tel: +33 1 41 19 21 99 Singapore Tel: +65 6595 6388 Germany Tel: +49 241 523030...