Larson Davis SoundAdvisor Reference Manual
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Larson Davis SoundAdvisor Reference Manual

Sound level meter
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Larson Davis
SoundAdvisor
Model 831C
Sound Level Meter
Reference Manual
SoundAdvisor Model 831C
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Summary of Contents for Larson Davis SoundAdvisor

  • Page 1 Larson Davis SoundAdvisor Model 831C Sound Level Meter Reference Manual SoundAdvisor Model 831C...
  • Page 2 Changes and improvements to the information described in this manual may be made at any time. Safety If the equipment is used in a manner not specified by Larson Davis, the protection provided by the equipment may be impaired. Recycling PCB Piezotronics, Inc.

  • Page 3: Table Of Contents

    Understanding the Overall Tab Understanding the Session Log Tab Adjusting the Graph Scale Enabling or Disabling Display Tabs Module 5 Calibrating Your SoundAdvisor 831C Understanding the Calibration Process Reviewing the Calibration Settings Choosing a Calibrator Calibrating Your SoundAdvisor 831C Module 6...

  • Page 4: Module 17

    13-1 13.1 Connecting to an Ethernet Port 13.2 Setting Up the Meter’s Network ID 13.3 Setting a Static IP Address 13.4 Using WiFi On Your 831C SoundAdvisor Module 14 Upgrading Firmware & Options 14-1 14.1 Updating the G4 LD Utility 14.2 Upgrading 831C Firmware by Using G4 LD Utility...
  • Page 5 Event Logging Software – Option 831C-ELA Time History Software – Option 831C-LOG PTB Approved Firmware Frequency Response Declaration of Conformity Appendix B Measuring Sound Using IEC 61672-1 Overview Section 9.3 Appendix C Glossary Overview Glossary of Terms SoundAdvisor Model 831C ii-3...

  • Page 6: Module 1

    Module 1 Model 831C Features he SoundAdvisor Model 831C SLM is a Class 1 acoustic monitoring instrument with a full-color touchscreen that measures noise frequency, sound pressure level, and community and environmental sound. The “C” in 831C refers to the full-color screen.

  • Page 7: Applications

    • 2 GB internal industrial grade data memory TAKE NOTE memory can be purchased • 240 x 320 full-color graphic LCD display with touchscreen user from Larson Davis as an interface option. • Quiet Touch elastomeric keypad • Meter uses NiMH, photo-lithium, lithium-Ion, and alkaline cells;...

  • Page 8: Standard 831C Package Contents

    The G4 LD Utility software (G4) comes on the included LD USB drive. The latest version of G4 is always available for download from www.LarsonDavis.com/G4. Lanyard 1.6 Options and Accessories In this section: • 1.6.1 Firmware Options 1.6.2 Hardware Options • SoundAdvisor Model 831C Standard 831C Package Contents...

  • Page 9: Firmware Options

    831C-SW Make direct USB communication with Sierra Wireless RV50X cellular gateway. 831C-AUD Using the AudCal software from Larson Davis in conjunction with your SoundAdvisor 831C enables you to test the calibration of audiometers and sound booths. 1.6.2 Hardware Options The following table contains only a few examples of the hardware accessories available for your 831C.
  • Page 10 Note: These mics are mV/Pa, providing performance mV/Pa, providing performance available directly from conforming to Class 1 sound conforming to Class 1 sound Larson Davis. You can also level meter standards level meter standards use other microphones with the 831C. (377C10) ¼-inch free-field (377C13)½-inch, prepolarized,...
  • Page 11 Cables: Extension and Interface Cables Microphone Extension CBL138 USB Cable CBL139 AC/DC Output Cable Cable: EXCXXX (shielded), where XXX is the length in feet (XXX = 010, 020, 050, 100 and 200 available) SoundAdvisor Model 831C Options and Accessories...

  • Page 12: Instrument Overview

    Module 2 Instrument Overview he SoundAdvisor Model 831C accomplishes all tasks related to sound monitoring. The 831C is a reliable and diversely competent meter. With the 831C, you can: • Measure all area sound • Stream and record audio continuously or for events using sample rates up to 51.2 ksps in compressed or uncompressed...

  • Page 13: Instrument Hardware Overview

    Display navigation softkeys On/Off button is also a one-touch power Multicolor back-lit keypad control access Tools button leads to system set-up Reset/Clear information Measurement USB Auxiliary port, AC/ DC output jack, and I/O connectors SoundAdvisor Model 831C Instrument Hardware Overview...

  • Page 14: Using The Keypad

    Softkeys: LEFT, RIGHT Navigate display tabs CENTER Close or exit a menu. Run or Pause a Stop or Store a measurement measurement Navigation buttons Up, Down, Right, Left Select or Enter Reset a measurement Access the menus. Power SoundAdvisor Model 831C Using the eypad...

  • Page 15: Navigating And Selecting

    Pressing the stop/store button while the meter is stopped will store the measurement data Reset measurement Press once to clear unsaved measurement data. Press a second time to reset filters (this may take a few seconds). 2.2.3 Entering Text SoundAdvisor Model 831C Using the Keypad...

  • Page 16: Display Elements Overview

    DOWN navigation buttons. If needed, additional pages of measurement data are available to purchase from Larson Davis. When the 831C is first powered on, the Live tab (Page 1) is the first screen you’ll see. Figure - reviews display elements that are common to most tabs.
  • Page 17 Figure - . FIGURE 2-5 Status Bar Power Indicator WiFi Status SLM Indicator Run Status File Name USB Memory Status OBA Indicator Measurement Runtime SoundAdvisor Model 831C Display Elements Overview...
  • Page 18 Under Range Icon The Under Range icon displays in the status bar while an under range condition applies. For details about the under range level, see 5.1.2 Determining Noise Floor, Overload, and Under Range Levels. SoundAdvisor Model 831C Display Elements Overview...
  • Page 19 The present run is paused. Run Pending The meter is waiting for filters and detector initialization to complete and will automatically start the run when the system is stable (typically less than 10 seconds). SoundAdvisor Model 831C Display Elements Overview...
  • Page 20 When you’ve purchased and installed firmware option 831C-SR or 831C-MSR, this feature allows you to assign a Sound Type marker to the curre nt sound. Whe n you e xamine the data file afte r the SoundAdvisor Model 831C Display Elements Overview...
  • Page 21 Access all data files on the meter or inserted USB drive. Module 8 Managing Measurement Data Files. Calibrate Module 5 Calibrate the microphone for accurate measurement. See Calibrating Your SoundAdvisor 831C. Setup Manager Setup measurement parameters and metrics. Module 6 Creating a Measurement Setup.
  • Page 22 Network and Connections. 2.3.6 Power Control Menu Overview To access the following actions on the Power Control menu, press the POWER button once. • Battery Information • Display Brightness • Power Off • Reboot SoundAdvisor Model 831C Display Elements Overview 2-11...

  • Page 23: Unpacking & Inspecting

    Inspecting Report any damage or shortage immediately to PCB Piezotronics, Inc. TAKE NOTE “Contact Larson Davis” on page i-2. he 831C is shipped in protective packaging. First, verify the shipment contains all parts and accessories for the configuration you selected.

  • Page 24: Connecting The Microphone & Preamplifier

    • Ground yourself so the pogo pin is not exposed to static shock. • Never use excessive force. • Gripping tightly or screwing tightly is unnecessary. • Do not remove the microphone grid cap and expose the dia- phragm. SoundAdvisor Model 831C Connecting the Microphone & Preamplifier...

  • Page 25: Connecting The Preamplifier To Meter

    831C until you hear a small click. 3.4 Disconnecting the Preamplifier FIGURE 3-2 831C Preamplifier Housing To disconnect the preamplifier, press and hold this button while gently pulling the microphone/preamplifier assembly from the meter. SoundAdvisor Model 831C Connecting the Preamplifier to Meter...

  • Page 26: Powering The 831C Slm

    When you power the 831C is again with fresh batteries or an external power supply, the unit returns to the state it was in prior to shutting down. SoundAdvisor Model 831C Powering the 831C SLM...
  • Page 27 Step 2 Select NiMH as the Battery Type. Step 3 The Charge drop-down menu is automatically set to On. If you do not want your power source to charge the batteries, select Off. SoundAdvisor Model 831C Powering the 831C SLM...

  • Page 28: Using External Power

    We recommend maintaining the internal battery The 831C utilizes the following external power sources: • USB port from a computer • USB port from PSA029 power supply • I/O connector from an external +10.8 to +25 Volt DC mains power source. SoundAdvisor Model 831C Powering the 831C SLM...

  • Page 29: Understanding 831C Power Usage

    If your meter has fully-charged NiMH batteries and is plugged into a power source, this icon indicates that it’s using power from the external source, and is not charging or using any power from the batteries. SoundAdvisor Model 831C Powering the 831C SLM...

  • Page 30: Powering On Or Off

    Power Control page. For more information, see Editing Power Settings 3.7 Operating the 831C Remotely Other than direct control on the meter interface, there are 3 ways you can remotely operate the 831C: SoundAdvisor Model 831C Powering On or Off...

  • Page 31: Operating The 831C From G4 Ld Utility

    Meters Panel on the left. Connected Not Connected Module 13 831C For more help connecting your SoundAdvisor, see LEARN MORE Network and Connections. Step 4 Click the name of your connected meter. This opens the Meter tab.

  • Page 32: Long Term Storage Of 831C

    1. Android is a trademark of Google LLC. 2. Apple and iPhone are trademarks of Apple Inc., registered in the U.S. and other countries. Multi-Touch is a trademark of Apple Inc. SoundAdvisor Model 831C Long Term Storage of 831C 3-10...
  • Page 33 If the switch is in the “ 0 ” position, the batteries are disconnected. After installing batteries be sure to move the switch to the “ | ” position. SoundAdvisor Model 831C Long Term Storage of 831C 3-11...

  • Page 34: Using The Data Display

    Since the values on the Live tab show active, real-time values that the meter is currently sensing, this page is not controlled by the (RUN/ PAUSE) button. This allows you to view the current SPL without disrupting your measured data. SoundAdvisor Model 831C Understanding the Live Tab...
  • Page 35 (as shown above) is the current peak value from the 1s peak detector. The fre- quency weighting (Z in this case) corre- sponds to your Peak selection in the pop- up menu on this tab. SoundAdvisor Model 831C Understanding the Live Tab...
  • Page 36 Frequency band level 4.1.4 About the Normalized Octave Band Page Live Page 4 The normalized octave band page only displays when you enable the TAKE NOTE Spectral Ln feature in the measurement setup file. SoundAdvisor Model 831C Understanding the Live Tab...
  • Page 37 4.1.6 About the Preamplifier nterface Page Live Page 6 Use the information on the preamplifier interface page to validate the proper operation of the meter. Figure 4- shows how this page’s display may differ, depending on the preamp installed. SoundAdvisor Model 831C Understanding the Live Tab...
  • Page 38 Estimated battery runtime • If the meter is being powered by batteries, then an esti- mated runtime will be listed in hours. • Charger Off • The batteries are not being charged. • Charging SoundAdvisor Model 831C Understanding the Live Tab...

  • Page 39: Understanding The Overall Tab

    Reset button There are other pages of data on Overall tab, which are available to TAKE NOTE purchase form Larson Davis. Depending on the options and features you’ve enabled, your 831C Overall tabs may differ from those shown in this section.
  • Page 40 It’s considered the max hold. ASmin The lowest level the SPL detector measured during the run time of the me asure me nt. A date and time of occurre nce is re corde d with this event. SoundAdvisor Model 831C Understanding the Overall Tab...
  • Page 41 FIGURE 4-11 Overall Tab: 1/1 Octave Band Page Table 4.1 O erall Octa e and Colors “Leq” is the average sound level of the highlighted frequency band for the duration of the measurement. SoundAdvisor Model 831C Understanding the Overall Tab...
  • Page 42 Reference, and back to Octaves to the weighting and reference. Similar to the OBA Overall Page 4, the normalized octave band page displays numerical values of the highlighted band. The data is then SoundAdvisor Model 831C Understanding the Overall Tab...
  • Page 43 4.2.6 About the Ln Percentiles Page Overall Page 6 FIGURE 4-14 Overall Tab: Ln Percentiles Page 60.8 dB means that the Fast (F) NF50 time-weighted level exceeded 60.8 dB 50% of the time during the measurement. SoundAdvisor Model 831C Understanding the Overall Tab 4-10...
  • Page 44 For details on this, see 6.2.2 Customizing Setup Values On the Setup Manager Tabs. FIGURE 4-15 Overall Tab: Exceedances Page During the exceedance After the exceedance # of exceedances Time of last exceedance SoundAdvisor Model 831C Understanding the Overall Tab 4-11...
  • Page 45 24 hours duration. The metric CNEL is equivalent to LDEN. TAKE NOTE FIGURE 4-17 Overall Tab: Community Noise Page SoundAdvisor Model 831C Understanding the Overall Tab 4-12...
  • Page 46 The inte grate d le ve ls for L are always calculated using the linear detector, regardless of the value selected in the SLM Setup. The L AIeq value is from the impulse detector. SoundAdvisor Model 831C Understanding the Overall Tab 4-13...
  • Page 47 You can use the ENTER 5 button to move the cursor and enable more information for example, if you want to see when a peak was measured as shown in Figure 4- 1. SoundAdvisor Model 831C Understanding the Overall Tab 4-14...
  • Page 48 This is the final page on the Overall tab. FIGURE 4-22 Overall Power Page Clock icon indicates the time is currently synced with NTP servers. SoundAdvisor Model 831C Understanding the Overall Tab 4-15...

  • Page 49: Understanding The Session Log Tab

    Run timer complete GPS Time Sync Low battery Charging stopped Out of memory Preamplifier connect/ Create new average disconnect 831 INT-ET (Comm Failure) USB Connection detected NTP Time Sync System time change SoundAdvisor Model 831C Understanding the Session Log Tab 4-16...

  • Page 50: Adjusting The Graph Scale

    Step 4 Select the checkbox in-line with the options you want visible on the meter. Step 5 Press Close ( ), then select Yes to save your changes. Select No to exit without saving. SoundAdvisor Model 831C Adjusting the Graph Scale 4-17...

  • Page 51: Calibrating Your Soundadvisor 831C

    Calibration History Tab ..................5-3 5.2.4 Calibration Certification Tab ................5-4 Choosing a Calibrator ......................5-5 Calibrating Your SoundAdvisor 831C ................. 5-5 5.1 Understanding the Calibration Process 5.1.1 Determining Microphone Sensitivity The primary role of sound level meter calibration is to establish a...

  • Page 52: Reviewing The Calibration Settings

    A warning appears when the difference between these two values exceeds 3 dB. 5.2 Reviewing the Calibration Settings On your 831C, go to Tools  Calibrate. 831C calibration settings display on the following 4 tabs: • 5.2.1 Calibrate Tab SoundAdvisor Model 831C Reviewing the Calibration Settings...

  • Page 53: Calibrate Tab

    When you perform a calibration using any of the known preamplifiers, the SoundAdvisor updates the saved calibration information for that preamplifier. If you install a different preamplifier, the SoundAdvisor applies the previously saved calibration information. As long as the same microphone is being used with that preamplifier, the calibration is accurate.
  • Page 54 A reminder will be displayed as a popup number of days before the interval time has expired. The certification interval can be changed to reflect your own certification time line. SoundAdvisor Model 831C Reviewing the Calibration Settings...

  • Page 55: Choosing A Calibrator

    If using a 1/4-inch microphone, the 1/4-inch adapter (ADP024, or TAKE NOTE ADP109) is required. Larson Davis recommends the following calibrator for the 831C: • Larson Davis Model CAL200: 94/114 dB @ 1 kHz. The following instances require a correction: •...
  • Page 56 The Default access other the settings is a read-only file and can’t tabs. Navigate back to be edited or deleted. the Setup Manager tab to save your changes. SoundAdvisor Model 831C 831C Setup Manager Overview...

  • Page 57: Creating A Custom Setup File

    To create a new Setup, highlight Default, then Click Refresh List to update click Save As to create the Setup Manager tab to the new setup file. reflect any changes you’ve made. SoundAdvisor Model 831C Creating a Custom Setup File...

  • Page 58: Customizing Setup Values On The Setup Manager Tabs

    Setup. Enter up to 250 characters describing the specifics of this measurement setup. The description appears in the downloaded data files. SoundAdvisor Model 831C Creating a Custom Setup File...
  • Page 59 Spectral Ln values can be measured using 1/1 or 1/3 octave bandwidths. If both 1/1 and 1/3 are selected in the Bandwidth setting, Spectral Ln only measures for 1/3 octaves. SoundAdvisor Model 831C Creating a Custom Setup File...
  • Page 60 99.99%. You can edit the Ln values and view the calculated value without stopping or For more information, see pausing the current Ln Value ” ” in the measurement. en i ary. SoundAdvisor Model 831C Creating a Custom Setup File...
  • Page 61 , 2002, re lating to the asse ssme nt and manage me nt of environmental noise. Because of these recommendations and the versatility of the standard on this point, it’s important to verify these values prior to making the measurement. SoundAdvisor Model 831C Creating a Custom Setup File...

  • Page 62: Choosing A Run Mode

    SEN032), the Weather Tab is active in the Setup Manager. For more information about weather accessories, view the LEARN MORE SoundAdvisor brochure at www.LarsonDavis.com. Choose your settings as shown in Figure -10. Once you Close and save the Setup, you can observe the weather readings on the Overall Tab: Weather Page as shown in Figure -11.
  • Page 63 Recommended for: All measurements have the same duration. Strength: The measurement is initiated manually, and stops automatically after the period you indicate. Step 1 Select Timed Stop from the Run Mode drop-down menu. SoundAdvisor Model 831C Creating a Custom Setup File...
  • Page 64 Time (hh:mm:ss). Time indicates the time of day of the first auto store. If you want to store a data file each hour of the day beginning at 10:05, TRY THIS choose the following settings: • Auto-Store: 1 h SoundAdvisor Model 831C Creating a Custom Setup File...

  • Page 65: Setting Triggers For Exceedances Or Events

    Enter a Start (y-m-d) date and Time, and an End (y-m-d) date and Time, where Time is the time of day. b. If desired, select the checkbox in-line with 2, and 3 to enter additional measurement periods. SoundAdvisor Model 831C Creating a Custom Setup File 6-10...

  • Page 66: Saving The Setup File

    Setup Manager in G4, select your meter in the Meters Panel, and click Setup Manager. For more information, refer to the G4 LD Utility Reference Manual at the following location: G4  Help Manuals. SoundAdvisor Model 831C Creating a Custom Setup File 6-11...

  • Page 67: Troubleshooting A Measurement Setup File

    Step 2 Select Default by highlighting it, then pressing e. This opens a pop- up menu. Step 3 Highlight, select Set to Active, and confirm your choice if required. Step 4 Press the Close softkey to save the meter settings. SoundAdvisor Model 831C Troubleshooting a Measurement Setup File 6-12...

  • Page 68: Making A Measurement

    Before performing a measurement, follow these steps to ensure the measurement is performed properly: Each step has a link to the first 6 Modules in the manual, and if read LEARN MORE through, will lead to optimal performance of the 831C. SoundAdvisor Model 831C Before You Start...
  • Page 69 A shielded microphone extension cable may be placed between the meter and the preamplifier/microphone if needed for the measurement position. No correction is necessary when using Larson SoundAdvisor Model 831C Before You Start...
  • Page 70 As a result, when performing measurements in the presence of low level airflows, we recommended that you place a windscreen over the microphone and preamplifier. Larson Davis provides the WS001 windscreen, which is a 3 ½-inch diameter ball made of open cell foam.

  • Page 71: Performing The Measurement

    Overall display animation, and the red and gre en illumination of the STOP/STORE and RUN/PAUSE keys. Table 7.1 Measurement State LED Indicators Measurement State Red LED reen LED Stopped Winking Paused Flashing Flashing Running Winking SoundAdvisor Model 831C Performing the Measurement...
  • Page 72 The 831C has a back-erase feature that allows for a quick erase of the last 5 to 10 seconds of measured data. This feature is used to erase sounds that are recorded, but not wanted in the overall measurement. SoundAdvisor Model 831C Performing the Measurement...
  • Page 73 Back Erase in the Session Log Back erase icon will appear when a part of the measurement was erased during a pause. The amount of time that was erased will be shown in the information box. SoundAdvisor Model 831C Performing the Measurement...

  • Page 74: Storing The Measurement

    Step 3 You will be prompted to save the file. You can change the name of the data file by highlighting the name and pre ssing ENTER . This displays the virtual keypad. When finished entering the name, select Yes to save. SoundAdvisor Model 831C Storing the Measurement...

  • Page 75: Managing Measurement Data Files

    Stop button, or a stop occurs, • you are prompted to save the measurement data file. We recommend this setting for manual measurements only. • Store: A measurement is automatically stored when a measurement is stopped. SoundAdvisor Model 831C Setting Data File Storage Preferences...

  • Page 76: Using The Data File Manager

    If a user is in the Data File Manage r and a anothe r atte mpts to ope n it, the se cond is SoundAdvisor Model 831C Using the Data File Manager...

  • Page 77: Viewing A Measurement Data File

    Step 2 Highlight your desired data file, press Menu ( ), then choose View. This opens a re ad-only display of the Overall and Session Log tabs, which show that measurement record. To indicate that you are seeing a SoundAdvisor Model 831C Using the Data File Manager...

  • Page 78: Using Load Settings

    After data files are averaged, you can save the new data as a single file. Follow these steps to create an average of your data file(s): Step 1 Navigate to Tools Data File Manager  SoundAdvisor Model 831C Using the Data File Manager...

  • Page 79: Saving, Moving, Or Copying Data Files

    When you select Internal, data files saved manually and via auto-store save to the meter’s 1.8 GB internal memory. Depending on the content and frequency of your measurements, this internal memory may quickly fill. SoundAdvisor Model 831C Saving, Moving, or Copying Data Files...
  • Page 80 If the internal memory becomes full, data files About the Out of Memory Error) save to the USB drive. (See Saving Data to SMTP or Cloud Storage 9.12 Setting Up Cloud Storage for Data Files. SoundAdvisor Model 831C Saving, Moving, or Copying Data Files...
  • Page 81 If the Data Storage setting is set to USB, but no USB drive is inserted, the USB not available icon appears. Files save to the internal memory until you insert a USB drive. SoundAdvisor Model 831C Saving, Moving, or Copying Data Files...
  • Page 82 USB caution icon appears. The meter notifies you that there is unsaved data and prompts you to Save or Delete the measurement data. You cannot continue with the same measurement. SoundAdvisor Model 831C Saving, Moving, or Copying Data Files...

  • Page 83: System Properties

    On your 831C, go to Tools System PropertiesDevice. Enter 30 characters per field of device information that will appear on the Tools About page and in alert notifications. 9.2 Updating the Meter Time On your 831C, go to Tools System PropertiesTime. SoundAdvisor Model 831C Setting Instrument Identification...

  • Page 84: Using Ntp To Sync The Meter Clock

    Ethernet, wireless modem, or WiFi. Before you begin: Se t the corre ct Time Zone (Menu  System Properties  • Time). Step 1 On the meter, go to System Properties  NTP. SoundAdvisor Model 831C Using NTP to Sync the Meter Clock...

  • Page 85: Editing Power Settings

    Power tab Set your Battery Type and Charge preference each time you change batteries to prevent damage or fire. 9.4.1 Changing Batteries and Editing the Battery Type On your 831C, go to Tools System PropertiesPower. SoundAdvisor Model 831C Editing Power Settings...
  • Page 86 Button press • Running a measurement • USB communication • Remote communication Pressing the (ON / OFF) key returns the instrument and the display to the state it was in when the Auto-Off time expired. SoundAdvisor Model 831C Editing Power Settings...
  • Page 87 The default voltage is 10.8 volts. To customize this setting, enter a LEARN MORE value between 10–25 volts if your battery usage is other than a standard 12V SLA battery. For more information, see Table A.3 on page 5. SoundAdvisor Model 831C Editing Power Settings...

  • Page 88: Setting Meter Preferences

    The 2 characters following the colon represent the desired response. For example: if my mic is a free-field mic in an EPS2116 with an environmental protection device and I want a 90 degree response, I would select FF:90 2116. SoundAdvisor Model 831C Setting Meter Preferences...
  • Page 89 On your 831C, go to Tools System PropertiesPreferences. If you want to attach a GPS device through the Aux port, select On from the GPS Mode drop-down. 9.5.6 Customizing the Display Color Theme On your 831C, go to Tools System PropertiesPreferences. SoundAdvisor Model 831C Setting Meter Preferences...

  • Page 90: Setting Localization Options

    Customizing the Start Display Start refers to the display that you see when you boot up the 831C. Select your option from the drop-down, save, and close. Your new start display appears on the next power up. SoundAdvisor Model 831C Setting Localization Options...

  • Page 91: Enabling Or Disabling Options

    Default options don’t appear in the list since they cannot be disabled. TAKE NOTE Step 1 On your SoundAdvisor 831C, go to Tools System Properties. Step 2 Press the top-right softkey until you see the Options Screen. Step 3 Select the checkbox in-line with the options you want available in the 831C interface.
  • Page 92 The 831C matche s re sponding se rve r with a provide d ce rtificate to verify that the responding server is known. If the responding server can’t be verified, the email will not send. Most email providers (such as Gmail) use this type of security. SoundAdvisor Model 831C Setting Up Alert Notifications 9-10...
  • Page 93 Step 3 Run a measurement and trigger an event. The alert notification sends after the event and any continuation TAKE NOTE period passes. The arrival time of the notification may also be impacted by Internet performance. SoundAdvisor Model 831C Setting Up Alert Notifications 9-11...

  • Page 94: Setting System Alert Notification Details

    When you change any setting or preference on the meter, the 831C sends an alert notification. Memory The 831C sends an alert notification when the primary memory storage (free space) is 25%, 10%, and 0%. Primary memory storage can be SoundAdvisor Model 831C Setting System Alert Notification Details 9-12...
  • Page 95 The 831C often queues alert notifications to send at a later time if the network connection is lost, etc. If you don’t want these older notifications to send, click the Clear Queue button to delete them. SoundAdvisor Model 831C Setting System Alert Notification Details 9-13...

  • Page 96: Setting Up Cloud Storage For Data Files

    USB drive, or upload directly to a remote storage service such as Dropbox or an SFTP account. You can also 1. Dropbox is a registered trademark of Dropbox, Inc. in the US and other countries. SoundAdvisor Model 831C Setting Up Cloud Storage for Data Files 9-14...

  • Page 97: Utilizing The Logic In, Logic Out Feature

    Event First, install and enable the Time History option (831C-ELA) on your meter. When Logic Out is set to Event, the output is activated with an event trigger. SoundAdvisor Model 831C Utilizing the Logic In, Logic Out Feature 9-15...

  • Page 98: Setting Reference Spectra

    (see 4)), the Overall view (see 4.2.5 About the Normalized Octave Band Page (Overall Page 5)), and in the Overall OBA page. See 4.2.4 About the Octave Band Analyzer Page (Overall Page SoundAdvisor Model 831C Setting Reference Spectra 9-16...

  • Page 99: Generating An App Password

    2-Step Verification is set up for security keys only • Your account receives verification through work, school, or another organization and can’t use this feature • You’ve turned on Advanced Protection for your account SoundAdvisor Model 831C Generating an App Password 9-17...
  • Page 100 Most of the time you’ll only enter the app password once per app or TAKE NOTE device, so you don’t need to memorize it. Step 8 If desired, select Generate a Test Email. SoundAdvisor Model 831C Generating an App Password 9-18...
  • Page 101 Module 1 System Information ystem information is contained on the About Menu. Tools About to view the following details on 3 On the 831C, go to tabs: FIGURE 10-1 About SoundAdvisor Model 831C 10-1...
  • Page 102 Record your unlock code in a secure place, in order to recall the code TAKE NOTE when needed. Your code can also be retrieved via G4 LD Utility. Navigate to Maintenance tab and choose Lock/Unlock. SoundAdvisor Model 831C Locking the Meter 11-1...
  • Page 103 Table 11.1 on page 11-4 for constraints on the various lock modes. Lock with Auto Store The display defaults to Big Digit format, and you cannot navigate to other views. FIGURE 11-3 Locked with Auto/Manual Store SoundAdvisor Model 831C Choosing a Lock Mode 11-2...
  • Page 104 If you’ve indicated an auto-store mode in your current setup file, the measurement runs and stores as indicated in the Setup. FIGURE 11-4 Locked Screen SoundAdvisor Model 831C Choosing a Lock Mode 11-3...
  • Page 105 Allow Calibration hen Locked was checked in the Lock Mode settings dialog. Pre ss the ce nte r softke y to navigate to the Calibrate display. For information on how to calibrate, see “Calibrating Your SoundAdvisor 831C” on page 5-1. 11.4 Constraints Table 11.1 Allowed Operations During Lock...
  • Page 106 Step 3 Select Lock/Unlock. Step 4 From the Lock Mode drop-down, select Unlock. You can also enter the Unlock Code shown in G4 into the Unlock Code dialogue on the meter. Step 5 Choose Upload. SoundAdvisor Model 831C Unlocking the Meter 11-5...
  • Page 107 USB storage as shown in Figure 1 -1. This feature forces the controller to re-map all bad blocks. Data in a bad flash block is usually unrecoverable. Check these files for TAKE NOTE errors if you receive this error message. SoundAdvisor Model 831C Troubleshooting Bad Flash Block Error 12-1...
  • Page 108 13.2 Setting Up the Meter’s Network ID ...................13-1 13.3 Setting a Static IP Address ....................13-2 13.3.1 Setting Up Alert Notifications When Using a Static IP Address ......13-2 13.4 Using WiFi On Your 831C SoundAdvisor ................13-3 13.4.1 Connecting to a WiFi Network ................13-3 13.4.2 Using 831C as a WiFi Access Point ..............13-4...

  • Page 109: Setting A Static Ip Address

    Before you begin: 13.3 Setting a Static IP Address • Complete Step 1 Obtain the IP address of your mail server. Step 2 On your 831C, go to Tools System Properties  Email. SoundAdvisor Model 831C Setting a Static IP Address 13-2...

  • Page 110: Using Wifi On Your 831C Soundadvisor

    Step 2 Select an available network. If no network appears on the list, select Menu and select Refresh List as shown in Figure 1 - . To connect to a hidden network, click Menu Add Network and TRY THIS provide the network name. SoundAdvisor Model 831C Using WiFi On Your 831C SoundAdvisor 13-3...
  • Page 111 Step 5 On your mobile device, open the LD Atlas app, and select the name of your meter. The LD Atlas app is available for iOS and Android devices. For more LEARN MORE 3.7.2 Operating the 831C from the LD Atlas App. information, see SoundAdvisor Model 831C Using WiFi On Your 831C SoundAdvisor 13-4...
  • Page 112 Step 1 In the G4 Meters Panel, your connected meter displays in blue with one of the following connection type indicators: Connection Types: TCP/IP via Local Area Network (LAN) TCP/IP via Internet WiFi SoundAdvisor Model 831C Updating the G4 LD Utility 14-1...
  • Page 113 • When you purchase an upgrade or option, you will receive the firmware upgrade file (in OP831C format) as an e mail attachment from Larson Davis. Save this file to your PC on the Desktop. • Power on your meter, and connect it to your PC via the USB cable (CBL138, part of the PSA029 power supply) or via TCP/IP.
  • Page 114 Step 4 Navigate to the Desktop (or to the location of the OP831C file you received in the option upgrade email from Larson Davis), select the file you want to install, and click Open. Step 5 Confirm your choice by clicking Upload Options. A progress bar under the Upload Options button shows the status of your update and a series of progress screens.
  • Page 115 Step 4 Select a Run Mode and associated settings to complete the Setup. Click a link below for instruction on completing the Setup: Selecting Manual or Stop When Stable Mode With • Measurement History SoundAdvisor Model 831C Setting Up a Measurement With Measurement History 15-1...
  • Page 116 When Measurement History is enabled, Timed Stop allows you to automatically make and store the number of measurements you set as the Measurement Counter and then stop. Subsequent runs, each SoundAdvisor Model 831C Setting Up a Measurement With Measurement History 15-2...
  • Page 117 Set it as the Active setup file. h. Go to System Properties  Preferences and verify the Auto- Store setting. In Timed Stop mode, the meter will store data SoundAdvisor Model 831C Setting Up a Measurement With Measurement History 15-3...
  • Page 118 If you enter any other Interval Time (hh:mm) value of • 01:00 or more, the measurement syncs to the hour. e. If you want to send a measurement interval exceedance alert, select a checkbox in-line with Alerts. SoundAdvisor Model 831C Setting Up a Measurement With Measurement History 15-4...
  • Page 119 Trigger Level (dB) of the selected Trigger Source at any time during the current measurement interval, the 831C sends an alert notification via email or text when the interval ends. SoundAdvisor Model 831C Setting Up a Measurement With Measurement History 15-5...
  • Page 120 15.2 Viewing Measurement History Data Files In this section: 15.2.1 Viewing Live Measurement Interval Data • • 15.2.2 Viewing Measurement History Data • 15.2.3 Viewing Measurement History Data From a Stored File SoundAdvisor Model 831C Viewing Measurement History Data Files 15-6...
  • Page 121 Fre uency Spectra Displays • When a frequency spectrum is displayed, use the RIGHT and LEFT navigation buttons ( ) to highlight a frequency band and display the associated levels. SoundAdvisor Model 831C Viewing Measurement History Data Files 15-7...
  • Page 122 15.2.3 Viewing Measurement History Data From a Stored File We recommend using the G4 LD Utility for viewing data files on your TAKE NOTE PC. For more information, see the G4 LD Utility Manual. SoundAdvisor Model 831C Viewing Measurement History Data Files 15-8...
  • Page 123 The G4 LD Utility also provides a simple, file transfer-style interface for TAKE NOTE configuring, saving, and transferring Setup files to your PC or to another meter. For more information, refer to the G4 LD Utility Manual. SoundAdvisor Model 831C Setting up a Measurement With Time History 16-1...
  • Page 124 Measurement ith Sound Markers. 16.1.1 Time History Available Metrics a le 1 1 shows data that is displayed for each Time History Metric, depending on the Time Interval Option you select. SoundAdvisor Model 831C Setting up a Measurement With Time History 16-2...
  • Page 125 * Only 1/1 Octave or 1/3 Octave can be chosen, not both. ** 1 second resolution and will not update between queries at faster than 1 second. ω is the weighting A, C, or Z SoundAdvisor Model 831C Setting up a Measurement With Time History 16-3...
  • Page 126 Step 3 Se le ct the che ckbox in-line with marke rs you want to use for this measurement. 18.1 Setting If you’re also planning to make sound recordings, section TAKE NOTE Up Markers for Sound Recording is a good reference. SoundAdvisor Model 831C Making a Time History Measurement With Sound Markers 16-4...
  • Page 127 Record view to the interval. Green marks the metric data metric view. is shown here). APeak To jump to a different record number, press the Menu softkey and select Locate from the pop-up menu. SoundAdvisor Model 831C Viewing Time History Data 16-5...
  • Page 128 To learn more about octave page displays, see Module 4 the desired band the numerical Using the Data Display. values below reflect the information at that octave. The selected record number of the highlighted data. SoundAdvisor Model 831C Viewing Time History Data 16-6...
  • Page 129 Ve rify that firmware option 831C-ELA has bee n installed and 14.4 enabled on your meter. For more information, see Enabling or Disabling Optional Firmware. Step 1 Navigate to Tools Setup Manager.  SoundAdvisor Model 831C Setting Up the Event History Measurement 17-1...

  • Page 130: Setting Up The Event History Measurement

    Step 6 Select the checkbox in-line with Event History, and enter values for the Min/Cont Duration. About the Minimum Duration: To prevent many small events of short duration, you can select a Minimum Duration. This is the length of SoundAdvisor Model 831C Setting Up the Event History Measurement 17-2...
  • Page 131 • Period Event Time History feature provides regularly logged metrics over the duration of a sound event according to the period you specify here. • Spectral Mode SoundAdvisor Model 831C Setting Up the Event History Measurement 17-3...

  • Page 132: Storing Event Data

    Run Mode selected in the measurement setup file. If you haven’t configured these settings to auto store, the data has not been stored to memory. To manually store a data file after a measurement is stopped, press the (STOP/STORE) button. SoundAdvisor Model 831C Storing Event Data 17-4...

  • Page 133: Viewing Event History Data On The Event History Tab

    Use the 8 and 2 buttons to navigate through different pages on the Event History Tab. For more information, see 2.3.2 Using Tabs and Pages. SoundAdvisor Model 831C Viewing Event History Data on the Event History Tab 17-5...

  • Page 134: Event History Spectral Display

    To learn more about octave page displays, see the following LEARN MORE sections: • 4.1.3 About the Octave Band Analyzer Page (Live Page 3) • 4.1.4 About the Normalized Octave Band Page (Live Page 4) SoundAdvisor Model 831C Viewing Event History Data on the Event History Tab 17-6...
  • Page 135 Your 831C SLM provides 2 ways to calculate an event trigger. The event trigger using Level Triggering is the static value you set. With dynamic triggering, the event trigger level adjusts according to the background noise (and any indicated offset) in each time history period. SoundAdvisor Model 831C Understanding Triggering Methods 17-7...

  • Page 136: Understanding Level Triggering

    Trigger Level to equal the background noise plus any indicated offset. This effectively removes background noise from the trigger level calculation. To calculate events based on event noise only, Dynamic triggering is an appropriate method. SoundAdvisor Model 831C Understanding Triggering Methods 17-8...
  • Page 137 Background tracking level Dynamic Event Dynamic Trigger Level About the Background Level The background sound level used with dynamic triggering is the user- indicated Ln level (Setup Manager  Ln Tab), calculated using an SoundAdvisor Model 831C Understanding Triggering Methods 17-9...
  • Page 138 (Ln Percentile and its rate). Thus, the dynamic trigger level is set to the following: Background level + Offset = Trigger Level SoundAdvisor Model 831C Understanding Triggering Methods 17-10...
  • Page 139 Step 1 On the meter, go to Tools Setup Manager. Step 2 Highlight the setup file you want to enable for Sound Recording, then press the top-left softkey (*//) until you see the Markers tab. SoundAdvisor Model 831C Setting Up Markers for Sound Recording 18-1...

  • Page 140: Making A Manual Sound Recording Using Mark Sound Type

    18.1 Setting Up Markers for Sound Recording. Step 1 With a measurement currently running, use the left or right softkeys (*/*) to navigate to the Live tab. SoundAdvisor Model 831C Making a Manual Sound Recording Using Mark Sound Type 18-2...

  • Page 141: Making An Automated Event Sound Recording

    If Event History is not enabled, but Event Sound is, the 831C will still TAKE NOTE make a sound recording for an event. SoundAdvisor Model 831C Making an Automated Event Sound Recording 18-3...

  • Page 142: About Sound Recording Constraints

    At any other sample rate, filter delays prevent this time synchronization. Table 18.1 Sound Recording Constraints Minimum Duration Sample Rate Pre Trigger 8 ksps 60 s 16 ksps 30 s 24 ksps 20 s 48 ksps 10 s SoundAdvisor Model 831C Making an Automated Event Sound Recording 18-4...

  • Page 143: Enabling Measurement History Sound Recording

    Snapshot Time ( 9999 s) is the OGG format. See 18.5.3 time in seconds that will record at Choosing a File Format for the beginning of each Sound Records measurement interval. SoundAdvisor Model 831C Enabling Measurement History Sound Recording 18-5...

  • Page 144: Understanding Recording Settings And Sound Quality

    To ensure the correct settings, navigate to Tools  Calibrate Settings, and see 5.4 Calibrating Your SoundAdvisor  831C. Next, the 831C automatically calculates the sound recording range based on the Peak Overload value. Additionally, setting the Gain at...

  • Page 145: Selecting An Appropriate Sound Recording Range

    Table 18.2 Sound Recording File Sizes Per 60 Seconds Sample Rate 8 ksps 0.96 MB 200 kB 16 ksps 1.98 MB 350 kB 24 ksps 2.88 MB 450 kB SoundAdvisor Model 831C Understanding Recording Settings and Sound uality 18-7...

  • Page 146: Sound Recording Playback

    After the sound recording is stored, you can access it most easily from the G4 LD Utility. For more information, see section A.4 Audio Files and Streaming in LEARN MORE the G4 LD Utility Reference Manual. SoundAdvisor Model 831C Sound Recording Playback 18-8...
  • Page 147 -inch free-field, prepolarized condenser microphone ½ Typical Sensitivity: 50 mV/Pa (+/-1.5 dB) corresponding to -26 dB re. 1 V/Pa Fre uency Response: 3 1 Hz to kHz ( / dB) Capacitance: 1 pF Microphone Preamplifier Model PRM831, 1/2” diameter x 2.88” SoundAdvisor Model 831C...
  • Page 148 Peak Range 68-143 59-123 64-143 46-123 66-143 48-123 ≥140 ≥120 ≥140 ≥120 ≥140 ≥120 SPL Max Level ≥143 ≥123 ≥143 ≥123 ≥143 ≥123 Peak Max Level 1. Microphone and electrical self-noise included 2. Electrical measurement, frequency 1kHz SoundAdvisor Model 831C...
  • Page 149 Power Draw: ≤ 500mA from PC, USB Hub, or PSA029 Supported Hosts: • Computer with SLM Utility-G4 • Ethernet Dock 831INT-ET • NoiseTutor • Computer with custom software using SWW-G4-SDK or SWW-G4-WIN USB Host Interface Type: USB 2.0 High-Speed, standard A connector Supported Devices: SoundAdvisor Model 831C...
  • Page 150 Output, 0 to +2.7 V Battery Logic In, Logic Control Input Input, 0 to +5 V Size: 4 x AA size cells (LR6) Types: 1.5 V Alkaline, 1.2 V NiMH rechargeable, 1.5 Ground, Digital and Power Ground Supply V Photo–Lithium SoundAdvisor Model 831C...
  • Page 151 Exte rnal: Up to 32 gigabyte USB Flash Me mory Voltage process Drive + 0.5 V Electrostatic Discharge The instrument is not adversely affected by Internal 4.1 V Halts electrostatic discharges. boot-up En ironmental Conditions process Operating Temperature: –30 to +50°C (–22 to shuts 122°F) down. SoundAdvisor Model 831C...

  • Page 152: Base Software

    1. add numbers in this column to levels read on the SLM to correct to the 0° Free Field level at frequency 2. From B&K 4226 Calibrator 3. From B&K UA033 EA 4. Corrections at 95% confidence. EA - Electrostatic Actuator WS - Windscreen Note: Data was taken at reference conditions 23° C, 50% RH, 101.3 kPa SoundAdvisor Model 831C...
  • Page 153 “Any Level” matrix. Units Time Units ωƬn1 Weighting ωƬn2 Linear ωƬn3 Linear AƬeq CƬeq ZƬeq 1. Linear integration method selected by user ωƬn4 2. Exponential Integration method selected by user ωƬn5 SoundAdvisor Model 831C...
  • Page 154 Nighttime portion of Day Night Level • LNight (T night C minus A mathematical subtraction of C and A weighted equivalent levels Linear Exponential Units AƬeq aƬeq Impulsivity Mathematical subtraction of impulse and linear equivalent levels Linear Exponential Units SoundAdvisor Model 831C...

  • Page 155: Octave Band Analysis Software - Option 831C-Ob3

    Class 1 limit curves. filters. The 0 dB gain setting and “high” OBA range FIGURE A-1 Filter Shape -20.0 20.0 40.0 1 kHz Filter Lower Limit 60.0 Upper Limit 80.0 100.0 120.0 100.0 1000.0 10000.0 Frequency Hz SoundAdvisor Model 831C...
  • Page 156 ≥ 88 ≥ 74 16000 ≥ 97 ≥ 96 ≥ 88 ≥ 77 43 to 140 24 to 120 23 to 110 17 to 90 110 to 43 24 to 120 22 to 110 14 to 90 SoundAdvisor Model 831C A-10...
  • Page 157 ≥ 100 ≥ 85 2000 ≥ 111 ≥ 110 ≥ 102 ≥ 90 29 to 140 12 to 120 10 to 110 6 to 90 30 to 140 10 to 120 8 to 110 0 to 90 SoundAdvisor Model 831C A-11...
  • Page 158 10 to 90 FIGURE A-2 Self-generated noise levels for 1/1 octave filters with PRM831 PRM831 1/1 OBA Noise Floor 50.0 40.0 30.0 20.0 High +0dB High +20dB 10.0 Normal +0dB Normal +20dB -10.0 -20.0 -30.0 1000 10000 SoundAdvisor Model 831C A-12...
  • Page 159 1000 10000 FIGURE A-4 Self-generated noise levels for 1/3 octave filters with PRM831 PRM831 1/3 OBA Noise Floor 50.0 40.0 30.0 20.0 High +0dB High +20dB 10.0 Normal +0dB Normal +20dB -10.0 -20.0 -30.0 1000 10000 SoundAdvisor Model 831C A-13...
  • Page 160 OBA Overall Equivalent ωeq(f) ωƬeq(f) Level Spectrum OBA Overall Maximum ωmax(f) ωƬmax(f) Level Spectrum OBA Overall Minimum Ƭmin(f) ωƬmin(f) Level Spectrum Percentile Spectrum Levels, uses same percentages n1 through n6 selected in SLM, 0.01 to 99.99% SoundAdvisor Model 831C A-14...

  • Page 161: Event Logging Software - Option 831C-Ela

    (requires 831C-OB3) Event Measurements: • Date and Time of initial occurrence • yyyy-mmm-dd hh:mm:ss • Date and Time of maximum occurrence • yyyy-mmm-dd hh:mm:ss • Duration of event • hh:mm:ss.s Exponent Linear Units Equivalent Level ωeq ωƬeq SoundAdvisor Model 831C A-15...

  • Page 162: Time History Software - Option 831C-Log

    Must be using a 377B02 microphone • Calibration must be within 1.5 dB of the certified sensitivity • Microphone corrections must be one of the following: • • FF:RI • FF:RI 2116 • FF:FF 2116 • FF:90 2116 SoundAdvisor Model 831C A-16...

  • Page 163: Plane Parallel To Display Screen

    Hertz and ranged from 200 Hz to 20 preamplifier at degrees increasing by 10, starting A. .1 Plane Parallel To Display Screen FIGURE A-6 Model 831 with 3 B Microphone Mic at n° Mic at n° 20° 60° 100° 140° 180° Frequency (Hz) SoundAdvisor Model 831C A-17...
  • Page 164 FIGURE A-7 Model 831 with 377B02 Microphone Mic at n° 40° 80° 120° 160° Frequency (Hz) FIGURE A-8 Model 831 with 377B02 Microphone Mic at n° 10° 50° 90° 130° 170° Frequency (Hz) SoundAdvisor Model 831C A-18...
  • Page 165 10° 340° 20° 330° 30° 320° 40° 310° 50° 300° 60° 290° 70° 280° 80° 1000 Hz 270° 90° 260° 100° 250° 110° 240° 120° 230° 130° 220° 140° 210° 150° 200° 160° 190° 170° 180° SoundAdvisor Model 831C A-19...
  • Page 166 290° 70° 1059.25 280° 80° 1333.52 1678.8 270° 90° 2113.49 2660.73 260° 100° 3349.65 4216.97 250° 110° 5308.84 6683.44 240° 120° 8413.95 230° 130° 10592.54 220° 140° 13335.21 210° 150° 16788.04 200° 160° 190° 170° 180° SoundAdvisor Model 831C A-20...
  • Page 167 70° 1000 1258.93 280° 80° 1584.89 1995.26 270° 90° 2511.89 3162.28 260° 100° 3981.07 5011.87 250° 110° 6309.57 240° 120° 7943.28 10000 230° 130° 12589.25 220° 140° 15848.93 210° 150° 19952.62 200° 160° 190° 170° 180° SoundAdvisor Model 831C A-21...
  • Page 168 FIGURE A-15 Model 831 with 377C20 Microphone Mic at n° 20° 60° 100° 140° 180° Frequency (Hz) FIGURE A-16 Model 831 with 377C20 Microphone Mic at n° 40° 80° 120° 160° Frequency (Hz) SoundAdvisor Model 831C A-22...
  • Page 169 FIGURE A-17 Model 831 with 377C20 Microphone Mic at n° 10° 50° 90° 130° 170° Frequency (Hz) FIGURE A-18 Model 831 with 377C20 Microphone Mic at n° 0° 30° 70° 110° 150° Frequency (Hz) SoundAdvisor Model 831C A-23...
  • Page 170 290° 70° 1059.25 280° 80° 1333.52 1678.8 270° 90° 2113.49 2660.73 260° 100° 3349.65 4216.97 250° 110° 5308.84 6683.44 240° 120° 8413.95 230° 130° 10592.54 220° 140° 13335.21 210° 150° 16788.04 200° 160° 190° 170° 180° SoundAdvisor Model 831C A-24...
  • Page 171 70° 1000 1258.93 280° 80° 1584.89 1995.26 270° 90° 2511.89 3162.28 260° 100° 3981.07 5011.87 250° 110° 6309.57 240° 120° 7943.28 10000 230° 130° 12589.25 220° 140° 15848.93 210° 150° 19952.62 200° 160° 190° 170° 180° SoundAdvisor Model 831C A-25...

  • Page 172: Perpendicular To Plane Of Display Screen

    A. .2 Perpendicular to Plane of Display Screen FIGURE A-23 Model 831 with 3 B Microphone Mic at n° 20° 340° 60° 300° 100° 260° 140° 220° 180° Frequency (Hz) SoundAdvisor Model 831C A-26...
  • Page 173 Model 831 with 377B02 Microphone Mic at n° 40° 320° 80° 280° 120° 240° 160° 200° Frequency (Hz) FIGURE A-25 Model 831 with 377B02 Microphone Mic at n° 0° 30° 330° 70° 290° 110° 250° 150° 210° Frequency (Hz) SoundAdvisor Model 831C A-27...
  • Page 174 290° 70° 1059 280° 80° 1334 1679 270° 90° 2113 2661 260° 100° 3350 4217 250° 110° 5309 240° 120° 6683 8414 230° 130° 10593 220° 140° 13335 210° 150° 16788 200° 160° 190° 170° 180° SoundAdvisor Model 831C A-28...
  • Page 175 290° 70° 1189 280° 80° 1496 1884 270° 90° 2371 2985 260° 100° 3758 4732 250° 110° 5957 240° 120° 7499 9441 230° 130° 11885 220° 140° 14962 210° 150° 18836 200° 160° 190° 170° 180° SoundAdvisor Model 831C A-29...
  • Page 176 230° 130° 10000 12589 220° 140° 15849 210° 150° 19953 200° 160° 190° 170° 180° FIGURE A-31 Model 831 with 377C20 Microphone Mic at n° 20° 340° 60° 300° 100° 260° 140° 220° 180° Frequency (Hz) SoundAdvisor Model 831C A-30...
  • Page 177 Model 831 with 377C20 Microphone Mic at n° 40° 320° 80° 280° 120° 240° 160° 200° Frequency (Hz) FIGURE A-33 Model 831 with 377C20 Microphone Mic at n° 0° 30° 330° 70° 290° 110° 250° 150° 210° Frequency (Hz) SoundAdvisor Model 831C A-31...
  • Page 178 290° 70° 1059 280° 80° 1334 1679 270° 90° 2113 2661 260° 100° 3350 4217 250° 110° 5309 240° 120° 6683 8414 230° 130° 10593 220° 140° 13335 210° 150° 16788 200° 160° 190° 170° 180° SoundAdvisor Model 831C A-32...
  • Page 179 290° 70° 1189 280° 80° 1496 1884 270° 90° 2371 2985 260° 100° 3758 4732 250° 110° 5957 240° 120° 7499 9441 230° 130° 11885 220° 140° 14962 210° 150° 18836 200° 160° 190° 170° 180° SoundAdvisor Model 831C A-33...

  • Page 180: Random Incidence

    6310 240° 120° 7943 230° 130° 10000 12589 220° 140° 15849 210° 150° 19953 200° 160° 190° 170° 180° A.7.3 Random Incidence Normalized to 1 kHz at 0 degrees. FIGURE A-39 Random Incidence Randomized Frequency (Hz) SoundAdvisor Model 831C A-34...

  • Page 181: Typical Z-Weight Frequency Response

    A.7.4 Typical Z-Weight Frequency Response For frequency responses of the Model with the PRM2103 Outdoor Microphone Preamplifier PRM2103 preamplifier, see the Larson Davis Manual. FIGURE A-40 Z Frequency Weighting, Direct Input Z Frequency Weighting, Direct Input Z Frequ -10.0 -20.0 -30.0...

  • Page 182: Declaration Of Conformity

    A.8 Declaration of Conformity SoundAdvisor Model 831C A-36...
  • Page 183 Appendix B Measuring Sound Using IEC 61672-1 B.1 Overview This appendix presents information for assessing Davis SoundAdvisor Model 831C according to IEC the sound level meter functionality of the Larson 61672-1 Edition 2.0 2013-09. B.2 Section 9.3 a) Reference Sound Pressure Level...
  • Page 184 0.12 0.55 8912.51 0.06 -0.06 0.13 0.19 -0.19 0.55 9440.61 0.01 -0.01 -0.03 -0.02 0.02 0.55 10000.00 0.01 -0.01 0.21 0.22 -0.22 0.55 10592.54 0.07 -0.07 0.09 0.16 -0.16 0.55 11220.18 0.05 -0.05 -0.05 0.00 0.00 0.55 SoundAdvisor Model 831C...
  • Page 185 -0.03 0.10 0.07 0.13 0.10 0.03 0.10 0.10 749.89 0.10 0.10 0.13 0.07 0.03 0.13 0.10 0.07 0.13 0.10 0.03 0.10 0.10 794.33 0.03 0.07 0.10 0.07 0.03 0.07 0.10 0.10 0.03 0.10 0.03 0.10 0.10 841.40 SoundAdvisor Model 831C...
  • Page 186 -0.03 -0.20 -0.23 -0.27 -0.20 -0.27 -0.10 -0.10 7498.94 -0.30 -0.37 -0.30 -0.23 -0.33 -0.23 -0.33 -0.40 -0.37 -0.33 -0.33 -0.20 -0.17 7943.28 -0.40 -0.37 -0.37 -0.43 -0.53 -0.43 -0.57 -0.57 -0.57 -0.50 -0.43 -0.23 -0.37 8413.95 SoundAdvisor Model 831C...
  • Page 187 Note that the correction factors are tabulated in Table A.2. EPS 2116 Correction Test Sound Level Meter Filter (See Table A.2) Free Field Response FF:FF 2116 Free Field to Free Field EPS2116 Correction Factor SoundAdvisor Model 831C...
  • Page 188 EPS 2116 Correction Test Sound Level Meter Filter (See Table A.2) 90 Degree Response FF:90 2116 Free Field to 90 Degree EPS2116 Correction Factor Random Incidence FF:RI 2116 Free Field to Random Incidence EPS 2116 Response SoundAdvisor Model 831C...
  • Page 189 0.09 0.20 595.66 0.29 -0.01 0.06 0.20 630.96 0.29 -0.01 0.07 0.20 668.34 0.31 -0.01 0.09 0.20 707.95 0.40 0.05 0.12 0.20 749.89 0.36 -0.01 0.07 0.20 794.33 0.35 0.00 0.08 0.20 841.4 0.37 -0.01 0.07 0.20 SoundAdvisor Model 831C...
  • Page 190 -0.97 0.20 3981.07 0.30 -1.55 -1.23 0.20 4216.97 0.16 -2.05 -1.39 0.30 4466.84 -0.06 -2.54 -1.56 0.30 4731.51 0.19 -2.61 -2.00 0.30 5011.87 0.02 -2.78 -2.08 0.30 5308.84 0.20 -3.35 -2.27 0.30 5623.41 0.15 -3.58 -2.42 0.30 SoundAdvisor Model 831C...
  • Page 191 20 dB 80.5 118.9 115.7 0 dB 137.5 140.5 139.7 137.4 134.3 20 dB 117.4 120.4 119.6 117.4 114.2 0 dB 140.5 140.5 140.5 140.5 140.5 20 dB 120.5 120.5 120.5 120.5 120.5 g) Linear Measurement Starting Point SoundAdvisor Model 831C...
  • Page 192 The electrical design of the input device to insert electrical signals into the preamplifier is a series 12pF ± 5% capacitor. The Larson Davis ADP090 is used for this purpose. The ADP090 is also use for noise floor measurements by attaching the included BNC short on the front of the ADP090.
  • Page 193 831C set to run with the LCD backlights on, an external charger (PSAA20R-120 charger), Ethernet dongle, and USB cable attached and with an E C020 (20 microphone extension cable) between the PRM831 and meter. FIGURE B-2 EM Field Orientation EM Field Principal Direction SoundAdvisor Model 831C B-11...
  • Page 194 Glossary C.1 Overview This appendix contains technical definitions of key acoustical and vibration terms commonly used with Larson Davis instru- ments. The reader is referred to American National Standards Institute document S1.1-1994 (R2004) for additional definitions. Specific use of the terms defined are in the main body of the text.
  • Page 195 Standard: ANSI S1.25 Criterion Sound Level (L It is the sound level which if continually applied for the Criterion Duration will produce a Noise Dose of 100%. The current OSHA Criterion Level is 90 dB. Standard: ANSI S12.19 SoundAdvisor Model 831C...
  • Page 196 Before explaining the calculation of dB values, it is useful to remember the following rules of thumb when dB values are used for sound levels: • Doubling of the Sound Pressure = 6 dB • Doubling of the Sound Power = 3 dB SoundAdvisor Model 831C...
  • Page 197 In conclusion, dB values are always the same, independent of using sound power or sound pressure as the base unit. A 6 dB increase implies four times the sound power or two times the sound pressure. SoundAdvisor Model 831C...
  • Page 198 (unsteady) sound levels. According to the ANSI S12.19 standard, the equation for it is   -------- - qLog   TWA 8   NOTE: This definition applies only for a Criterion Duration of 8 hours. SoundAdvisor Model 831C...
  • Page 199 When in the far field, the sources have all merged into one, so that measurements made even further away will be "Geometric Near Field:" no different. for the advantages of being in the geometric far field. SoundAdvisor Model 831C...
  • Page 200 C-Weighting: A filter that adjusts the levels of a frequency spectrum in the same way the human ear does when exposed to high levels of sound. This weighting is most often used for evaluation of equipment sounds. See table below. SoundAdvisor Model 831C...
  • Page 201 -0.8 5000 -1.2 -1.3 6300 -0.1 -1.9 -2.0 8000 8000 -1.1 -2.9 -3.0 10000 -2.5 -4.3 -4.4 12500 -4.3 -6.1 -6.2 16000 16000 -6.6 -8.4 -8.5 20000 -9.3 -11.1 -11.2 Integration Method "Linear Integration", or "Exponential Integration". SoundAdvisor Model 831C...
  • Page 202 Microphone - Uses: The frequency response of microphones can be adjusted to be used in spe- cific applications. Among those used are: SoundAdvisor Model 831C...
  • Page 203 1. Do not use a microphone at frequencies higher than specified by the manufacturer; to increase the frequency response choose smaller microphones. 2. Choose a microphone for free field or random incidence to minimize the influence of orienta- tion. SoundAdvisor Model 831C C-10...
  • Page 204 Zero represents no exposure and 100 or more represents complete exposure. It is calculated by dividing the actual time of exposure by the allowed time of exposure. The allowed time of expo- sure is determined by the Criterion Duration and by the sound level (the higher the level, the SoundAdvisor Model 831C C-11...
  • Page 205 P ( ) t d t squared seconds, or Pascals-squared hours. The following for- mula describes exposure in terms of E, where p is the sound pressure and T is the Measurement Duration (specific time period). SoundAdvisor Model 831C C-12...
  • Page 206 Sound Pressure Level (SPL, Lp) The logarithmic form of sound pressure. It is also expressed by attachment of the word decibel to the number. The logarithm is taken of the ratio of the actual sound pressure to a reference sound SoundAdvisor Model 831C C-13...
  • Page 207 1 pico-watt. Sound power level cannot be measured directly, but can only be deduced through measurements of sound intensity or sound pressure around the source. The equation for it is  L w 10 ------- - 10log 10 W 0 10 SoundAdvisor Model 831C C-14...
  • Page 208     -- - 10 Klog     TWA TC   Where TC=T and K is the Exchange Rate Factor. It is used for hearing damage risk assessment. Standard: ANSI S12.19 SoundAdvisor Model 831C C-15...
  • Page 209 Hz, and w is the radian fre- quency. It has the dimensions of inverse length.  2 2f ----- - ------- - --- -  SoundAdvisor Model 831C C-16...
  • Page 210 Larson Davis - a PCB Piezotronics division LarsonDavis.com P/N I831C Rev M, Firmware version 4.0.5 ©2019 PCB Piezotronics, Inc. orldwide Corporate Head uarters Toll-free (in the US): 888-258-3222 3425 Walden Avenue Phone: 716-926-8243 Depew, NY 14043-2495 USA USA fax: 716-926-8215 E-mail: sales@larsondavis.com...

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