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SoundAdvisor Model 831C

B-4

891.25

0.10

0.07

0.10

0.00

0.03

0.07

0.03

0.07

0.13

0.07

0.03

0.10

0.10

944.06

0.13

0.17

0.20

0.07

0.07

0.07

0.13

0.17

0.20

0.17

0.03

0.17

0.13

1000.00

0.20

0.10

0.13

0.07

0.03

0.17

0.10

0.17

0.23

0.10

0.03

0.10

0.10

1059.25

0.10

0.10

0.23

0.17

0.13

0.07

0.10

0.07

0.13

0.10

0.03

0.10

0.10

1122.02

0.20

0.23

0.23

0.13

0.13

0.17

0.10

0.17

0.23

0.20

0.13

0.13

0.10

1188.50

0.20

0.10

0.23

0.07

0.13

0.17

0.10

0.17

0.13

0.20

0.13

0.17

0.10

1258.93

0.13

0.17

0.23

0.17

0.13

0.17

0.23

0.13

0.23

0.17

0.13

0.10

0.20

1333.52

0.20

0.20

0.33

0.27

0.13

0.17

0.20

0.23

0.23

0.20

0.13

0.20

0.10

1412.54

0.20

0.20

0.23

0.17

0.23

0.17

0.20

0.27

0.23

0.20

0.13

0.17

0.20

1496.24

0.23

0.20

0.23

0.17

0.23

0.17

0.20

0.27

0.23

0.27

0.13

0.10

0.20

1584.89

0.33

0.30

0.37

0.30

0.27

0.27

0.33

0.27

0.30

0.27

0.20

0.27

0.30

1678.80

0.30

0.30

0.40

0.37

0.33

0.27

0.30

0.27

0.33

0.20

0.17

0.20

0.27

1778.28

0.40

0.40

0.43

0.37

0.33

0.33

0.40

0.37

0.33

0.40

0.13

0.30

0.30

1883.65

0.40

0.40

0.43

0.37

0.33

0.37

0.40

0.37

0.33

0.30

0.23

0.30

0.30

1995.26

0.40

0.50

0.43

0.47

0.43

0.47

0.40

0.37

0.37

0.40

0.23

0.33

0.30

2113.49

0.50

0.50

0.53

0.47

0.43

0.47

0.40

0.47

0.43

0.37

0.33

0.33

0.40

2238.72

0.50

0.50

0.53

0.47

0.43

0.47

0.50

0.47

0.47

0.40

0.30

0.40

0.40

2371.37

0.50

0.50

0.53

0.47

0.43

0.47

0.50

0.47

0.53

0.50

0.33

0.50

0.40

2511.89

0.50

0.57

0.53

0.57

0.50

0.57

0.53

0.53

0.53

0.50

0.37

0.47

0.47

2660.73

0.53

0.53

0.57

0.57

0.50

0.50

0.60

0.50

0.53

0.50

0.43

0.50

0.43

2818.38

0.57

0.53

0.57

0.60

0.50

0.50

0.53

0.53

0.57

0.57

0.43

0.57

0.50

2985.38

0.40

0.50

0.43

0.57

0.43

0.50

0.57

0.53

0.57

0.57

0.37

0.50

0.50

3162.28

0.40

0.40

0.53

0.50

0.33

0.57

0.50

0.47

0.53

0.50

0.43

0.50

0.50

3349.65

0.30

0.40

0.37

0.37

0.37

0.43

0.40

0.40

0.43

0.43

0.40

0.50

0.50

3548.13

0.23

0.27

0.33

0.30

0.23

0.37

0.33

0.33

0.37

0.40

0.33

0.40

0.40

3758.37

0.20

0.23

0.13

0.17

0.23

0.27

0.20

0.23

0.33

0.37

0.27

0.40

0.30

3981.07

0.10

0.10

0.13

0.13

0.00

0.13

0.10

0.10

0.23

0.20

0.13

0.27

0.23

4216.97

0.03

0.00

0.10

0.03

-0.10

0.07

0.00

-0.03

0.07

0.03

0.03

0.10

0.13

4466.84

0.00

-0.07

-0.07

-0.07

-0.17

-0.07

-0.10

-0.10

-0.07

0.00

-0.07

0.00

0.00

4731.51

-0.30

-0.20

-0.17

-0.23

-0.27

-0.30

-0.30

-0.43

-0.27

-0.20

-0.37 -0.20 -0.20

5011.87

-0.17

-0.20

-0.17

-0.30

-0.27

-0.23

-0.40

-0.33

-0.37

-0.40

-0.37 -0.30 -0.30

5308.84

0.00

-0.10

-0.07

-0.23

-0.30

-0.33

-0.40

-0.43

-0.47

-0.50

-0.60 -0.43 -0.43

5623.41

0.00

-0.07

-0.03

-0.17

-0.20

-0.33

-0.37

-0.43

-0.47

-0.50

-0.53 -0.43 -0.43

5956.62

0.17

0.07

0.10

-0.13

-0.17

-0.23

-0.33

-0.37

-0.43

-0.50

-0.57 -0.50 -0.40

6309.57

0.10

0.20

0.23

-0.03

-0.07

-0.03

-0.10

-0.33

-0.37

-0.40

-0.47 -0.40 -0.30

6683.44

0.13

0.10

0.20

0.07

-0.03

-0.03

-0.13

-0.17

-0.27

-0.33

-0.40 -0.40 -0.20

7079.46

0.03

0.07

0.07

0.07

0.03

0.00

-0.10

-0.13

-0.17

-0.27

-0.27 -0.23 -0.13

7498.94

-0.10

-0.10

-0.07

-0.03

-0.07

-0.03

-0.20

-0.23

-0.27

-0.20

-0.27 -0.10 -0.10

7943.28

-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

8413.95

-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

Table B.2 Directional Response of 3 ½-inch Windscreen

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Summary of Contents for SoundAdvisor

Page 1: ...SoundAdvisor Model 831C i 1 Larson Davis SoundAdvisor Model 831C Sound Level Meter Reference Manual...

Page 2: ...iodically update the material for inclusion in new editions 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...

Page 3: ...erstanding the Live Tab 4 2 Understanding the Overall Tab 4 3 Understanding the Session Log Tab 4 4 Adjusting the Graph Scale 4 5 Enabling or Disabling Display Tabs Module 5 Calibrating Your SoundAdvi...

Page 4: ...g 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 L...

Page 5: ...s A 1 A 1 Instrument Platform A 2 Base Software A 3 Octave Band Analysis Software Option 831C OB3 A 4 Event Logging Software Option 831C ELA A 5 Time History Software Option 831C LOG A 6 PTB Approved...

Page 6: ...ries 1 3 1 6 1 Firmware Options 1 4 1 6 2 Hardware Options 1 4 1 1 Basic Operations The 831C performs the following operations TRY THIS Explore the interface press buttons change settings and test the...

Page 7: ...ting time AC DC output jack with full dynamic range option Compatible with 61 m 200 ft microphone extension cable full scale to 20 kHz Dust resistant durable plastic case with lanyard tripod mount is...

Page 8: ...ree field prepolarized microphone 50 mV Pa providing performance conforming to Class 1 sound level meter standards 377C20 inch random incidence prepolarized microphone 50mV Pa providing performancecon...

Page 9: ...ment data 831C MSR Measurement History for the manual or timed storage of statistical data with all sound recording capabilities 831C SW Make direct USB communication with Sierra Wireless RV50X cellul...

Page 10: ...microphone 50 mV Pa providing performance conforming to Class 1 sound level meter standards Microphone Preamplifier Options 426E01 1 2 inch ICP Low Noise microphone preamplifier requires adapter ADP07...

Page 11: ...If you re making a square wave pulse measurement include a 100 kHz low pass T filter with the adapter ADP002 6 8pF BNC Input Adapter for inch 7pF microphone equivalent ADP090 12pF BNC Input Adapter f...

Page 12: ...ry using USB memory Automatically synchronize the clock with Network Time Protocol NTP or GPS for optimal accuracy Select desired color theme on the full color graphic LCD display with touchscreen use...

Page 13: ...n to disconnect the preamp from the meter 240 x 320 full color graphic LCD display with touchscreen user interface shown with Dark color theme Display navigation softkeys Multicolor back lit keypad To...

Page 14: ...USB mass storage cellular modem GPS headphones speakers and future devices 2 Hardware Power Switch when set to 0 com pletely powers down the 831C for storage Set to for instrument operation 3 USB Int...

Page 15: ...There are times when a content specific menu appears Press the associated top soft key to access that menu Exit a menu Press the top middle soft key to close or save To exit without saving press it a...

Page 16: ...r theme The Dark theme is featured in this manual For more information see 9 5 6 Customizing the Display Color Theme 2 3 2 Using Tabs and Pages The 831C interface is organized into tabs The Live and O...

Page 17: ...t time Elapse d Time If the measurement is stopped the elapsed time stops You can enable and view up to 20 pages of Overall data Session Log Tab The Se ssion Log tab displays a re cord of me te r acti...

Page 18: ...con appears Files save to the meter until you insert a USB drive If the USB drive is re move d during a me asure me nt the same icon appears the measurement ends and data with that measurement is not...

Page 19: ...the instrument and the preamplifier influence the measurement an Under Range condition exists When all filters of the OBA are under range the OBA Under Range Icon flashes Measurement Status Icons FIGU...

Page 20: ...3 4 Main Menu Overview The 831C main menu contains the following 5 features Setup Manager The Setup Manager is a menu on the 831C divided into tabs just like the 831C main display that enables you to...

Page 21: ...reens Only available with printer inserted 2 3 5 Tools Menu Overview Press the TOOLS 3 button gives you access to the following menus and settings on the 831C Data File Manager Access all data files o...

Page 22: ...e Module 12 System Utilities Communication Quick access to communication properties See Module 13 831C Network and Connections 2 3 6 Power Control Menu Overview To access the following actions on the...

Page 23: ...G4 LD Utility 3 9 3 7 2 Operating the 831C from the LD Atlas App 3 9 3 7 3 Operating the 831C from a Web Browser 3 10 3 8 Long Term Storage of 831C 3 10 3 1 Unpacking Inspecting TAKE NOTE Report any d...

Page 24: ...ase date model and serial numbers for your instrument preamplifier and microphone 3 2 Connecting the Microphone Preamplifier CAUTION DO NOT handle the microphone and preamplifier without observing the...

Page 25: ...ment look for a vertical engraved line on the preamplifier which aligns with the arrow about the button on the 831C For reference see Figure Step 2 With the alignment marks on both pieces lined up ver...

Page 26: ...tter ies Use an external battery charger to restore charge then install in meter Addi tionally the batteries may be too hot or too cold CAUTION The 831C is compatible with Energizer Duracell and other...

Page 27: ...as shown here Charging Batteries in the 831C Before you begin Install batteries as shown in Installing Batteries You can charge batteries NiMH only in the meter in about 7 hours when the meter is tur...

Page 28: ...per second Charger fault Green light fastest blink three times per second Meter is powering up or shutting down Resolving a Charging Stopped Session Log Entry To resolve a Charging Stopped Session Lo...

Page 29: ...ff Whe n the 831C shuts down due to a low batte ry it automatically attempts to power up after a short reprieve If there s adequate power it remains on However if the battery is still discharged it po...

Page 30: ...o access the Power Control page then press the top left softkey to select Off 2 From any screen press and hold the ON OFF button 0 for 3 seconds to begin the shut down sequence 3 Press and hold the ON...

Page 31: ...troduction The manual is available at LarsonDavis com G4 Step 2 Install G4 on your PC Installing a Locate the most re ce nt ve rsion by navigating to LarsonDavis com G4 and choosing the version you ne...

Page 32: ...ile device or PC We recommend using Chrome Step 3 In the address field type the IP address of your 831C Sound Advisor Ex 198 999 103 25 SoundAdvisor TRY THIS To find your meter s IP address go to Tool...

Page 33: ...SoundAdvisor Model 831C Long Term Storage of 831C 3 11 If the switch is in the 0 position the batteries are disconnected After installing batteries be sure to move the switch to the position...

Page 34: ...Overall SLM Page Overall Page 1 4 6 4 2 2 About the Overall Big Digit Page Overall Page 2 4 7 4 2 3 About the Overall Leq Page Overall Page 3 4 7 4 2 4 About the Octave Band Analyzer Page Overall Pag...

Page 35: ...ge 1 Page 1 on the Live tab presents a recent history of metrics You can customize the displayed metrics as shown below in this section TRY THIS While on the Live 1 of 8 page press the ENTER 5button a...

Page 36: ...tude of sound for that frequency FIGURE 4 3 Live Tab 1 1 Octave Band Page 4 1 4 About the Normalized Octave Band Page Live Page 4 TAKE NOTE The normalized octave band page only displays when you enabl...

Page 37: ...ier 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 pr...

Page 38: ...n esti mated runtime will be listed in hours Charger Off The batteries are not being charged Charging Preamplifier currently connected The voltage of the preamplifier connected is shown in VDC When a...

Page 39: ...measurement The overall data resets when the measurement is stopped and saved or when you press the Reset button 1 TAKE NOTE There are other pages of data on Overall tab which are available to purchas...

Page 40: ...west 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 Leq using frequency weighing and detector indicated User def...

Page 41: ...the Live tab you can customize the metrics on this octave band page as shown in 4 1 3 About the Octave Band Analyzer Page Live Page 3 The Overall tab s octave band pages show measurement data from th...

Page 42: ...evels at different times this spectrum might be one which never occurred at any instant during the measurement period At Max When set to At Lmax it is the instantaneous spectrum at the moment when the...

Page 43: ...l Tab 1 3 Octave Spectral Ln 4 2 6 About the Ln Percentiles Page Overall Page 6 FIGURE 4 14 Overall Tab Ln Percentiles Page Table 4 2 Reference Spectra Options User Defined 1 2 3 4 Positive Frequency...

Page 44: ...anager Tabs The values of Ln are calculated from an amplitude distribution table ranging from 0 to 200 dB in 0 1 dB increments As a result it is possible to calculate Ln values from values of n rangin...

Page 45: ...can find more overload information in 5 1 2 Determining Noise Floor Overload and Under Range Levels 4 2 9 About the Community Noise Page Overall Page 9 The Community Noise page displays the values LDN...

Page 46: ...ment and management of environmental noise It is important to verify prior to measurement that the values have been properly defined for your purposes For help setting these values see 6 2 2 Customizi...

Page 47: ...me trics matrix page shows all the data the me te r is always measuring in one page You can use the ENTER 5 button to move the cursor and enable more information for example if you want to see when a...

Page 48: ...iewing the Power Page Overall Page 14 The powe r page on the Ove rall tab shows all re cords for that measurement and the status of the meter s internal memory This is the final page on the Overall ta...

Page 49: ...so recorded Session Log meter actions include the following A calibration occurred The measurement was paused A run was initiated There was a time sync Highlight the log entry to see the meter source...

Page 50: ...Press the Close softkey then select Yes to save your changes 4 5 Enabling or Disabling Display Tabs Step 1 On the 831C go to Tools System Properties Step 2 Use the top right softkey to navigate to Di...

Page 51: ...diaphragm of the microphone and the voltage measured by the meter so that the sound pressure level can be read directly from the display of the meter in dB The result of a calibration is the determin...

Page 52: ...SLM Performance Nominal Values on page A 2 5 1 3 Understanding Calibration Stability The 831C maintains a stable value of sensitivity over long periods of time Significant changes in sensitivity or a...

Page 53: ...preamplifier the calibration is accurate 5 2 2 Calibration Settings Tab FIGURE 5 1 Calibration Settings 5 2 3 Calibration History Tab Select a log entry and a calibration spectra box appears Select a...

Page 54: ...sured during thecurrentcalibration and the level from the previous calibration Sensitivity is shown in dB relative to 1 V Pa Since space is limited on the meter display you ll find a more detailed ver...

Page 55: ...5 4 Calibrating Your SoundAd isor 831C Step 1 On your SoundAdvisor go to Tools Calibrate Step 2 Choose your calibrator from the Select Calibrator drop down menu LEARN MORE Refer to the calibrator s u...

Page 56: ...g a Measurement Setup File 6 12 6 1 831C Setup Manager O er iew FIGURE 6 1 Setup Manager Tab Leq Lmax Lmin corresponding to user selected values of frequency weighting and detector Lpeak and Lpeak max...

Page 57: ...eating a New Setup ile Before you begin Cle ar the possibility of conflicting se ttings by se tting the LD De fault Se tup to Active as shown in 6 3 Troubleshooting a Measurement Setup File Step 1 On...

Page 58: ...etup Manager Step 2 Highlight your setup file in the list then use the top left and top right softkeys to navigate and set values on the tabs as shown in the following figures TAKE NOTE Any changes yo...

Page 59: ...t needs to begin measuring the current sound See also Detector in the en i Gl ary Select the 20 dB Gain checkbox when measuring low level sounds or when the sound level is near background noise level...

Page 60: ...6 1 O A O erload Le els Input ain dB OBA Range Overload Level dB peak 0 High 143 20 High 123 0 Normal 110 20 Normal 90 The Sound Advisor 831C has 6 Run Modes to control the meter during a measurement...

Page 61: ...verify these values prior to making the measurement SPL Trigger Levels When the measured SPL Slow Fast or Impulse is greater than the trigger level the exceedance begins The measured SPL is defined by...

Page 62: ...you begin Complete the processes described in the previous sections of 6 2 Creating a Custom Setup File This section applies only when weather accessories are connected to the 831C On the Setup Manag...

Page 63: ...l Run Stop from the Run Mode drop down menu Step 2 If desired enable any additional settings on the Control tab and move to section 6 2 4 Setting Triggers for Exceedances or Events Using Timed Stop Mo...

Page 64: ...If you set Daily Auto Store to Never the meter defaults to your meter preferences for Auto Store If a measurement is paused Continuous mode automatically resumes the measurement after 5 minutes Step 1...

Page 65: ...ble any additional settings on the Control tab and move to 6 2 4 Setting Triggers for Exceedances or Events Using Daily Timer Mode Use Daily Timer mode to schedule one or more measurements which start...

Page 66: ...Manager tabs and move to section 6 2 5 Saving the Setup File 6 2 5 Saving the Setup File Before you begin Complete the previous processes beginning with 6 2 1 Step 1 To save your Setup and exit the S...

Page 67: ...the Active setup can clear the meter when it s doing something unexpected and you don t know why Step 1 On the meter select Menu Setup Manager Step 2 Select Default by highlighting it then pressing e...

Page 68: ...o Overall display Step 3 Press Run 9 Step 4 When finished press Stop 7 Step 5 Press Store 7 and save your data file In this module In this module In this module In this module In this module In this m...

Page 69: ...ount the 831C on a tripod If held in hand position your body away from and on an angle to the meter to minimize interference of the sound field at the microphone resulting from body reflections The mi...

Page 70: ...mmended that you place a windscreen over the microphone and preamplifier Larson Davis provides the WS001 windscreen which is a 3 inch diameter ball made of open cell foam FIGURE 7 2 WS001 Windscreen 7...

Page 71: ...Are a Sound Fie ld Che ck as shown in 7 1 2 Performing an Area Sound Field Check Step 2 Navigate to Overall on the 831C and press RUN eypad LED Indicators When performing a measurement the state of t...

Page 72: ...n exists Under Range When the sound pressure level is lower than the meter s noise floor the noise level of the instrument and the preamplifier the Under Range icon flashes while the condition exists...

Page 73: ...state Measurement History Event History Spectral Ln Event Sound Recording FIGURE 7 4 Using 831C Back Erase Session Log The session log will have an icon to indicate data had been erased FIGURE 7 5 Ba...

Page 74: ...ed and reset the run time clock to zero A reset will not reset stored data files only the current run A reset can be initiated when the 831C is running paused or stopped 2 3 Stopping the Measurement T...

Page 75: ...ving or Copying Data Files to a USB Drive 8 7 8 1 Setting Data File Storage Preferences On the Meter Preferences page the Auto Store and Data Storage settings allow you to indicate where when and how...

Page 76: ...Store Preference and Stop Method Run Mode Type of Stop Auto Store Preference Prompt Store Timed Stop Timer final stop Prompts at timer s end Stores automatically Manual stop Prompts when stopped Stor...

Page 77: ...The current measurement can be running paused or stopped while viewing data files This number refers to the available internal storage unless a USB drive is connected and set for store only Then it r...

Page 78: ...oad Settings from the pop up me nu No confirmation appears Step 4 Close the Data Manager go to Menu Setup Manager and confirm settings in the Active Setup 2 3 Using Create Average Create Average take...

Page 79: ...tion 8 3 2 About Data File Naming Conventions 8 3 3 Moving or Copying Data Files to a USB Drive 8 3 1 Setting a Data File Storage Location Use the meter preferences to indicate where your future measu...

Page 80: ...the G4 LD Utility Manual Saving Data to a USB Drive On your 831C go to Tools System Properties Preferences When you select USB from the Data Storage drop down menu data files saved manually and throug...

Page 81: ...USB drive Table 8 2 Data File Naming Con entions Run Mode File Naming Convention Example Additional Information Manual Stop Default Data File NNN 831 Data 001 The Default Data File can be changed on...

Page 82: ...the 831C are saved to the USB drive The original data files remain saved in internal memory Move All Internal to USB All original data files move from the internal memory to the USB drive The interna...

Page 83: ...ation Options 9 7 9 7 Setting Options On the Displays Tab 9 8 9 8 Enabling or Disabling Options 9 9 9 9 Setting Network Preferences 9 9 9 10 Setting Up Alert Notifications 9 9 9 11 Setting System Aler...

Page 84: ...refer to the G4 LD Utility Reference Manual 9 3 Using NTP to Sync the Meter Clock The 831C communicates with NTP servers to sync the internal clock with the most accurate time This requires a valid In...

Page 85: ...ting Auto Off 9 4 3 Using Analog Power Save Mode 9 4 4 Setting the Backlights On Period 9 4 5 Enabling or Disabling the Keypad Backlight 9 4 6 Setting the External Shutoff Voltage FIGURE 9 3 Power tab...

Page 86: ...o to Tools System Properties Step 2 Press the top right softkey until the Power tab appears Step 3 Select the Battery Type that matches the batteries you re installing Step 4 Install 4 new batteries F...

Page 87: ...bling or Disabling the Keypad Backlight On your 831C go to Tools System Properties Power The blue LEDs under the keypad can be enabled or disabled according to your preference The Red LED behind the S...

Page 88: ...s Preferences Step 2 Select a option from the Mic Correction drop down menu For Mic Correction options the 2 characters before the colon represent the physical mic type The 2 characters following the...

Page 89: ...henever you make a measurement that you don t want to keep press the 1 Reset button to clear the unsaved data When you select the checkbox in line with Reset Prompting the meter requires you to confir...

Page 90: ...Norwegian Spanish Swedish Czech Turkish Chinese and Thai Selecting a Decimal Symbol Depending on your preference select a period or a comma for the decimal place and save your change Selecting a Date...

Page 91: ...with the options you want available in the 831C interface TAKE NOTE Disabling an option in this section does not delete the option You can select it again at anytime Step 4 Reboot the meter 9 9 Settin...

Page 92: ...erties Email Step 2 Enter a Hostname for your mail server and a Username and Password for your mail account FIGURE 9 7 Email Preferences Screen Step 3 Select the Security level for the account TLS Tru...

Page 93: ...ck to see if your meter is connected to the Internet Also make sure a proxy is not filtering your email For additional questions or troubleshooting contact your local IT support Step 8 Click Close to...

Page 94: ...erties Alerts and select from the following options Settings When you change any setting or preference on the meter the 831C sends an alert notification Memory The 831C sends an alert notification whe...

Page 95: ...r is lost and meter is running on external battery for more than 30 minutes If power lost alert is sent then power is restored to mains for at least 3 minutes an alert will be sent Run State This aler...

Page 96: ...erature If a notification is sent the temperature can rise above the trigger 40 C or fall below the trigger 70 C multiple times until the temperature rises falls at least 5 C If the same conditions ar...

Page 97: ...ng the included CBL170 I O Interface cable The device connected through the Logic Input can initiate one of the following actions by an external trigger Run Stop Event A measurement run or stop can be...

Page 98: ...ng this setting FIGURE 9 10 Recommended Heater Settings Timer Turns the heater on and off automatically according to the Start Time 24 hr time and End Time 24 hr time you set here Off The heater remai...

Page 99: ...ng in to Google panel choose App Passwords If you don t see this option 2 Step Verification is not set up on your account 2 Step Verification is set up for security keys only Your account receives ver...

Page 100: ...e Other and give your device a name Step 6 Choose Generate Step 7 Enter the app Password on the System Properties Email tab The password is the 16 character code in the yellow bar on your device TAKE...

Page 101: ...SoundAdvisor Model 831C 10 1 Module 1 System Information System information is contained on the About Menu On the 831C go to Tools About to view the following details on 3 tabs FIGURE 10 1 About...

Page 102: ...s feature 11 1 Locking the Meter 11 1 11 2 Choosing a Lock Mode 11 2 11 3 Allowing Calibration When Locked 11 4 11 4 Constraints 11 4 11 5 Unlocking the Meter 11 4 11 1 Locking the Meter Step 1 Naviga...

Page 103: ...changes 11 2 Choosing a Lock Mode Whe n the 831C is unlocke d you can acce ss all fe ature s and data displays and change any settings Click on a link to learn more about the following lock modes with...

Page 104: ...To learn more about Big Digit format see 4 1 2 About the Big Digit Sound Page Live Tab Page 2 Lock with Manual Store The data view defaults to Big Digit format and you cannot navigate to other views A...

Page 105: ...unlocked settings can be changed and the measurement can run pause stop and store during a lock when operated using G4 LD Utility 11 5 Unlocking the Meter To unlock the 831C follow these steps Step 1...

Page 106: ...from G4 LD Utility Step 2 Select your meter in the Meters Panel then navigate to the Maintenance tab in the Meter Manager Step 3 Select Lock Unlock Step 4 From the Lock Mode drop down select Unlock Yo...

Page 107: ...ormat and Restore also clears the AudCal database TAKE NOTE If a measurement is running stopped or paused a Reset is required 12 1 Troubleshooting ad Flash lock Error The Flash memory device used by t...

Page 108: ...wing equipment SoundAdvisor Model 831C SLM DV 012 USB Ethernet dongle Ethernet cable A functional Ethernet network port Step 2 Connect the assembly as shown in Figure 13 1 831C Connected to Ethernet F...

Page 109: ...31C from G4 LD Utility Step 1 On your meter go to Tools System Properties Network Step 2 Enter your IP Subnet and Gateway addresses Step 3 Select Set Static IP then reboot the meter for these settings...

Page 110: ...nnecting to a iFi Network 13 4 2 Using 831C as a iFi Access Point 13 4 1 Connecting to a i i Network To connect the 831C to an existing WiFi network follow these steps Before you begin Conne ct a WiFi...

Page 111: ...The WiFi status icon appears in the top left Step 1 On your 831C go to Tools Setup iFi Step 2 Select Menu Step 3 In the menu window that opens select Set Access Point and confirm your choice in the po...

Page 112: ...the G4 installer Step 3 Once the file is downloaded unzip or extract the folder to your Desktop Step 4 Open the new folder and run setup exe Step 5 Follow the on screen instructions to install the upg...

Page 113: ...n followed by progress screens until the firmware is upgraded 14 3 Upgrading Options Before you begin When you purchase an upgrade or option you will receive the firmware upgrade file in OP831C format...

Page 114: ...o view your currently installed options LEARN MORE For details about customizing your firmware options see 14 4 Enabling or Disabling Optional Firmware 14 4 Enabling or Disabling Optional Firmware Onc...

Page 115: ...ters can be indicated directly in the Active setup it s a good practice to save a setup file for each specific measurement you perform as shown in this section TAKE NOTE The G4 LD Utility also provide...

Page 116: ...otification via email or text when the interval ends c Select any additional settings on the Setup Manager tabs For more information on this process see 6 2 2 Customizing Setup Values On the Setup Man...

Page 117: ...dB for the alert The Trigger Level cannot be less than 0 1 dB TAKE NOTE Trigger Sources for this alert include the following statistics LAe LCe L e Lmax Lmin and all 6 values of Ln If the current dB l...

Page 118: ...surement at 10 10 the measurement record stores at 11 05 12 05 and so forth In this case the initial measurement history record has only 50 minutes of data while all others contain the full hour b If...

Page 119: ...ingle Block Timer Mode ith Measurement History a 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 Select the Enable Measurement History checkbox c If yo...

Page 120: ...an 0 1 dB TAKE NOTE Trigger Sources for this alert include the following statistics LAeq LCeq LZeq Lmax Lmin and all 6 values of Ln If the current dB level is greater than the Trigger Level dB of the...

Page 121: ...ule 4 Using the Data Display 15 2 2 Viewing Measurement History Data The Me asure me nt tab can display data for any of the pre viously completed measurement intervals Intervals records are numbered s...

Page 122: ...tra Displays On screens that do not contain frequency spectrum displays use the RIGHT and LEFT navigation buttons 4 and 6 to step right and left through the selected measurement record numbers 15 2 3...

Page 123: ...ng Time History Data 16 5 16 1 Setting up a Measurement With Time History Time History describes the measured sound as a table of metrics recorded at regular intervals Before you begin Verify that fir...

Page 124: ...ns are available for every time period For a complete list of options see Table 16 1 Step 5 Select any additional settings on the Setup Manager tabs For more information on this process see 6 2 2 Cust...

Page 125: ...l l l l L FSPL l l l l L ISPL l l l l LCeq LAeq l l l LIeq Leq l l l l OBA Bandwidth Leq 1 1 l l l l l 1 3 l l l l l Lmax 1 1 l l l 1 3 l l l Lmin 1 1 l l l 1 3 l l l SPL 1 1 l l l l 1 3 l l l l LAFTM...

Page 126: ...kers follow these steps Before you begin Complete steps 1 4 of 16 1 Setting up a Measurement ith Time History Step 1 With your Time History setup file highlighted in the Setup Manager press the top so...

Page 127: ...rking a Sound Type 16 3 iewing Time History Data Time History data displays on the Time History tab as shown in Figure 1 FIGURE 16 3 Time History Tab Page 1 Select Motorcycle to mark the beginning of...

Page 128: ...ch page FIGURE 16 4 Time History 1 1 Octave Page The highlighted band is the L eq average sound level of for the duration of the measurement at that frequency Use the LEFT and RIGHT navigation buttons...

Page 129: ...17 5 17 3 Viewing Event History Data on the Event History Tab 17 5 17 3 1 Event History Spectral Display 17 6 17 4 Understanding Triggering Methods 17 7 17 4 1 Understanding Level Triggering 17 8 17 4...

Page 130: ...Source and Trigger Level values Using Running Le as a Trigger Source Using this setting if the Leq for the most recent period is greater than the set Trigger Level the meter creates an event a Select...

Page 131: ...threshold level again and still be statistically considered part of the initial event This value must be 9 seconds or less However if the measured level drops below the threshold level and remains be...

Page 132: ...10 periods seconds will be logged Since this event extends beyond the maximum sample time there will be no post trigger sample logged regardless of the set Post Event value Step 10 Press Close and sav...

Page 133: ...Daily Auto Store periods 10 min the 831C waits up to 1 minute to allow an in progress event to end before storing the file 17 3 Viewing Event History Data on the Event History Tab From the Live Tab p...

Page 134: ...ns 4 1 3 About the Octave Band Analyzer Page Live Page 3 4 1 4 About the Normalized Octave Band Page Live Page 4 Selected event number number of measurements Green line represents the Trigger Level Ev...

Page 135: ...g 17 4 2 Understanding Dynamic Triggering 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 e...

Page 136: ...Events 1 4 2 Understanding Dynamic Triggering With dynamic triggering the 831C tracks the background noise level and adjusts the Trigger Level to equal the background noise plus any indicated offset T...

Page 137: ...igger Level The Leq is set the same as in Figure 17 8 Event History with Level Triggering The background level is tracked throughout the measurement The trigger level is adjusted based on the backgrou...

Page 138: ...he background tracking level the tracking level will increase at the rise rate As the sound decreases below the tracking level the tracking level will decrease at the rate determined by the dynamic re...

Page 139: ...18 4 Enabling Measurement History Sound Recording 18 5 18 5 Understanding Recording Settings and Sound Quality 18 6 18 5 1 Understanding Resolution Peak Overload 18 6 18 5 2 Selecting an Appropriate...

Page 140: ...If you select Cancel you return to the Setup Manager without saving Step 7 Run a measurement and manually mark the sound types as shown in 18 2 Making a Manual Sound Recording Using Mark Sound Type 18...

Page 141: ...ted E ent Sound Recording Before you begin Open the Setup Manager Tools Setup Manager and create a setup file with Event History enabled as shown in 17 1 Setting Up the Event History Measurement Step...

Page 142: ...at the sound recording is associated to the first event even though it contains sound recordings for the subsequent events 1 3 1 About Sound Recording Constraints If you set the Minimum Duration and P...

Page 143: ...nd recording Range value For more information about this and other values on the Sound page which affect the quality of the recording see 18 5 Understanding Recording Settings and Sound Quality Step 3...

Page 144: ...ion which provides a measurement range of about 90 dB This means that the 831C is capable of recording sound signals with amplitudes no more than 90 dB below the level at which the selected range will...

Page 145: ...checkbox The compression setting saves sound records in OGG format This compressed format is most portable easily shared over email and text or as an alert notification However it may also truncate O...

Page 146: ...lay sound recordings directly from the 831C Step 1 Connect a USB compatible headset or speaker to the 831C Step 2 Use the top left softkey to open the Session Log tab and select a sound event from the...

Page 147: ...ten i n ca le A 1 Instrument Platform Supplied Microphone Model 377B02 inch free field prepolarized condenser microphone Typical Sensitivity 50 mV Pa 1 5 dB corresponding to 26 dB re 1 V Pa Fre uency...

Page 148: ...B 20 dB Measurement Range1 1 Microphone and electrical self noise included A 24 140 20 120 n a n a 21 140 16 120 C 26 140 25 120 n a n a 21 140 16 120 Z 36 140 33 120 n a n a 27 140 25 120 Typical Noi...

Page 149: ...sps USB Client Interface Type USB 2 0 High Speed Mini B connector Power Draw 500mA from PC USB Hub or PSA029 Supported Hosts Computer with SLM Utility G4 Ethernet Dock 831INT ET NoiseTutor Computer w...

Page 150: ...with a 10k pull down resistor to ground 10k from pin 4 to pin 1 or 5 Battery Size 4 x AA size cells LR6 Types 1 5 V Alkaline 1 2 V NiMH rechargeable 1 5 V Photo Lithium 0 dB Gain 20 dB Gain AC Output...

Page 151: ...cated to data and user setups Exte rnal Up to 32 gigabyte USB Flash Me mory Drive Electrostatic Discharge The instrument is not adversely affected by electrostatic discharges En ironmental Conditions...

Page 152: ...hone type and for environmental protection accessories Note RI indicates Random Incidence and FF indicates Free Field For microphone 377B20 RI to FF For microphone 377B02 FF to RI For microphone 377B0...

Page 153: ...d Maximum Levels Percentile Levels percentages n1 through n6 selectable 0 01 to 99 99 Statistics are sampled every 10ms from the selected frequency and time weighted detector Time Weighting A C Z Unit...

Page 154: ...itude dg m m Elevation m or feet Time Acquired h m s Measurement Control Multiple control modes provide for manual and automated measurements Manual Manually control measurements RUN PAUSE RESUME STOP...

Page 155: ...10 center frequencies and have real time performance for all filters The 0 dB gain setting and high OBA range is the reference range and the reference input signal is 5 Volt rms at 1 kHz 1 1 Octave C...

Page 156: ...22 117 3 to 120 110 0 to 110 95 5 to 90 125 113 27 to 140 100 20 to 120 91 19 to 110 73 18 to 90 125 117 110 to 24 115 5 to 120 108 2 to 110 94 4 to 90 250 113 27 to 140 103 17 to 120 94 16 to 110 76...

Page 157: ...40 121 1 to 120 112 2 to 110 97 7 to 90 80 0 120 21 to 140 102 19 to 120 92 18 to 110 73 17 to 90 80 0 122 19 to 140 120 0 to 120 112 2 to 110 98 8 to 90 100 120 20 to 140 103 18 to 120 94 17 to 110 7...

Page 158: ...107 34 to 140 105 15 to 120 97 13 to 110 82 8 to 90 5000 107 34 to 140 106 14 to 120 98 12 to 110 87 4 to 90 6300 106 35 to 140 104 16 to 120 96 14 to 110 82 9 to 90 6300 106 35 to 140 105 15 to 120...

Page 159: ...generated noise levels for 1 3 octave filters with PRM831 30 0 20 0 10 0 0 0 10 0 20 0 30 0 40 0 50 0 1 10 100 1000 10000 Direct 1 1 OBA Noise Floor High 0dB High 20dB Normal 0dB Normal 20dB 30 0 20...

Page 160: ...le Spectrum Levels uses same percentages n1 through n6 selected in SLM 0 01 to 99 99 Statistics are sampled every 100ms from the selected OBA frequency weighting and time weighting into 0 1 dB wide am...

Page 161: ...acking rate and tracking percentile Minimum Duration Selectable from 0 to 9 9 s Continuation Period Selectable from 0 to 9 s Event Time History Selectable On or Off Period Selectable for periods 20 ms...

Page 162: ...Metrics Internal Temperature Internal Humidity SEN031 Metrics Windspeed Wind Gust Speed Wind Direction Temperature Avg Min Max Humidity Avg Min Max Barometric Pressure SEN032 Metrics Windspeed Wind G...

Page 163: ...preamplifier at degrees increasing by 10 starting with 0 and rotating to 250 The frequency was measured in Hertz and ranged from 200 Hz to 20 Hz A 1 Plane Parallel To Display Screen FIGURE A 6 Model 8...

Page 164: ...e FIGURE A 8 Model 831 with 377B02 Microphone 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 100 1000 10000 Decibels dB re 1000 Hz 0 Frequency Hz 40 80 120 160 Mic at n 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 100 1000...

Page 165: ...onal Characteristics 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 100 1000 10000 Decibels dB re 1000 Hz 0 Frequency Hz 0 30 70 110 150 Mic at n 22 18 14 10 6 2 2 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140...

Page 166: ...340 350 281 84 354 81 446 68 562 34 707 95 891 25 1122 02 1412 54 1778 28 2238 72 2818 38 3548 13 4466 84 5623 41 7079 46 8912 51 11220 18 Frequency Hz 26 22 18 14 10 6 2 2 0 10 20 30 40 50 60 70 80 9...

Page 167: ...54 375 84 473 15 595 66 749 89 944 06 1188 5 1496 24 1883 65 2371 37 2985 38 3758 37 4731 51 5956 62 7498 94 9440 61 11885 02 14962 36 18836 49 Frequency Hz 26 22 18 14 10 6 2 2 0 10 20 30 40 50 60 7...

Page 168: ...e FIGURE A 16 Model 831 with 377C20 Microphone 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 100 1000 10000 Decibels dB re 1000 Hz 0 Frequency Hz 20 60 100 140 180 Mic at n 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 100...

Page 169: ...FIGURE A 18 Model 831 with 377C20 Microphone 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 100 1000 10000 Decibels dB re 1000 Hz 0 Frequency Hz 10 50 90 130 170 Mic at n 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 100 1...

Page 170: ...340 350 281 84 354 81 446 68 562 34 707 95 891 25 1122 02 1412 54 1778 28 2238 72 2818 38 3548 13 4466 84 5623 41 7079 46 8912 51 11220 18 Frequency Hz 26 22 18 14 10 6 2 2 0 10 20 30 40 50 60 70 80 9...

Page 171: ...54 375 84 473 15 595 66 749 89 944 06 1188 5 1496 24 1883 65 2371 37 2985 38 3758 37 4731 51 5956 62 7498 94 9440 61 11885 02 14962 36 18836 49 Frequency Hz 26 22 18 14 10 6 2 2 0 10 20 30 40 50 60 7...

Page 172: ...A 26 A 2 Perpendicular to Plane of Display Screen FIGURE A 23 Model 831 with 3 B Microphone 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 100 1000 10000 Decibels dB re 1000 Hz 0 Frequency Hz 20 340 60 300 100 2...

Page 173: ...odel 831 with 377B02 Microphone 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 100 1000 10000 Decibels dB re 1000 Hz 0 Frequency Hz 40 320 80 280 120 240 160 200 Mic at n 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 100 10...

Page 174: ...0 1000 10000 Decibels dB re 1000 Hz 0 Frequency Hz 10 350 50 310 90 270 130 230 170 190 Mic at n 26 22 18 14 10 6 2 2 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 2...

Page 175: ...20 230 240 250 260 270 280 290 300 310 320 330 340 350 282 355 447 562 708 891 1122 1413 1778 2239 2818 3548 4467 5623 7079 8913 11220 14125 17783 Frequency Hz 26 22 18 14 10 6 2 2 0 10 20 30 40 50 60...

Page 176: ...60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 251 316 398 501 631 794 1000 1259 1585 1995 2512 3162 3981 5012 6310 7943 10000 1258...

Page 177: ...odel 831 with 377C20 Microphone 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 100 1000 10000 Decibels dB re 1000 Hz 0 Frequency Hz 40 320 80 280 120 240 160 200 Mic at n 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 100 10...

Page 178: ...0 1000 10000 Decibels dB re 1000 Hz 0 Frequency Hz 10 350 50 310 90 270 130 230 170 190 Mic at n 26 22 18 14 10 6 2 2 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 2...

Page 179: ...20 230 240 250 260 270 280 290 300 310 320 330 340 350 282 355 447 562 708 891 1122 1413 1778 2239 2818 3548 4467 5623 7079 8913 11220 14125 17783 Frequency Hz 26 22 18 14 10 6 2 2 0 10 20 30 40 50 60...

Page 180: ...dence 26 22 18 14 10 6 2 2 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 251 316 398 501 631 794 1000 1259 1585 1...

Page 181: ...h the PRM2103 preamplifier see the Larson Davis PRM2103 Outdoor Microphone Preamplifier Manual FIGURE A 40 Z Frequency Weighting Direct Input 30 0 20 0 10 0 0 0 dB Z Frequ 80 0 70 0 60 0 50 0 40 0 30...

Page 182: ...SoundAdvisor Model 831C A 36 A 8 Declaration of Conformity...

Page 183: ...requency Response and Corrections See Table A 5 SLM with PRM831 and 377B02 Microphone on page 6 A Table B 1 831C with PRM831 and 377B02 Microphone average frequency responses and corrections Required...

Page 184: ...1 07 0 10 0 10 0 00 0 10 0 10 0 35 4216 97 0 03 0 03 0 20 0 23 0 23 0 45 4466 84 0 35 0 35 0 22 0 13 0 13 0 45 4731 51 0 06 0 06 0 39 0 33 0 33 0 45 5011 87 0 08 0 08 0 39 0 47 0 47 0 45 5308 84 0 04...

Page 185: ...0 07 0 07 0 00 354 81 0 03 0 07 0 10 0 03 0 07 0 00 0 00 0 03 0 03 0 03 0 03 0 03 0 00 375 84 0 03 0 07 0 03 0 00 0 03 0 03 0 00 0 03 0 03 0 00 0 10 0 00 0 00 398 11 0 00 0 00 0 10 0 03 0 03 0 00 0 0...

Page 186: ...37 0 47 0 47 2660 73 0 53 0 53 0 57 0 57 0 50 0 50 0 60 0 50 0 53 0 50 0 43 0 50 0 43 2818 38 0 57 0 53 0 57 0 60 0 50 0 50 0 53 0 53 0 57 0 57 0 43 0 57 0 50 2985 38 0 40 0 50 0 43 0 57 0 43 0 50 0...

Page 187: ...0 67 0 73 0 63 0 60 0 73 0 57 0 83 0 90 0 83 0 87 0 73 0 70 0 70 12589 25 0 57 0 73 0 83 0 87 0 97 0 97 1 00 1 00 1 00 1 17 1 07 0 90 0 90 13335 21 0 70 0 67 0 63 0 83 1 00 1 17 1 10 1 07 1 07 1 37 1...

Page 188: ...B 6 90 Degree Response FF 90 2116 Free Field to 90 Degree EPS2116 Correction Factor Random Incidence Response FF RI 2116 Free Field to Random Incidence EPS 2116 Test Sound Level Meter Filter EPS 2116...

Page 189: ...0 04 0 00 0 00 0 20 251 19 0 07 0 00 0 00 0 20 266 07 0 04 0 10 0 06 0 20 281 84 0 05 0 04 0 06 0 20 298 54 0 06 0 01 0 02 0 20 316 23 0 10 0 02 0 04 0 20 334 97 0 09 0 06 0 04 0 20 354 81 0 10 0 00...

Page 190: ...04 0 23 0 20 1883 65 0 77 0 02 0 18 0 20 1995 26 0 85 0 10 0 17 0 20 2113 49 0 70 0 15 0 12 0 20 2238 72 0 75 0 20 0 08 0 20 2371 37 0 55 0 15 0 00 0 20 2511 89 0 72 0 12 0 07 0 20 2660 73 0 74 0 14 0...

Page 191: ...21 1 17 4 64 2 90 0 30 14125 38 1 59 4 95 3 41 0 30 14962 36 2 20 5 41 4 07 0 30 15848 93 3 05 6 30 4 98 0 30 16788 04 3 88 7 46 6 31 0 30 17782 79 5 38 8 87 7 91 0 30 18836 49 6 56 10 06 9 40 0 30 19...

Page 192: ...taken that would not meet the requirements of IEC 61672 l Typical Stabilization Time The typical time interval needed to stabilize after changes in environmental conditions For a temperature change o...

Page 193: ...cable attached and with an E C020 20 microphone extension cable between the PRM831 and meter o AC Power and Radio Fre uency Susceptibility The mode of operation of the 831C that produced the least im...

Page 194: ...area for 2 hours and 31 minutes he will have accu mulated a Noise Dose of 100 Standard ANSI S12 19 See Exchange Rate Q Exchange Rate Factor q Exposure Factor k At Lmax At Lmax is one of 2 choices for...

Page 195: ...essened tolerance for noise during evening activities They are energy summed and converted to an average noise exposure rating Criterion Duration Tc It is the time required for a constant sound level...

Page 196: ...c unit Pascal for acoustic measurements It is not possible to directly add or subtract physical quantities when expressed in decibel form since the addition of logarithmic values correspond to multipl...

Page 197: ...t they remain the same even if we use sound pressure or sound power Compare this to the use of voltage and power units in electrical engineering units being related by P V2 In table 2 an illustration...

Page 198: ...electro mechanical meter so that the amplitude could be determined Slow and Fast detector settings are still useful in modern sound measurement instruments Slow has a time constant of 1 second Fast h...

Page 199: ...re two types of far fields the acoustic far field and the geometric far field Acoustic Far Field The distance from a source of sound is greater than an acoustic wavelength In the far field the effect...

Page 200: ...ed a lower cutoff frequency and below a certain fixed frequency called an upper cutoff frequency The difference between the two cutoff frequencies is called the bandwidth It is used to discriminate ag...

Page 201: ...cies Hz Weighting Network Frequency Response 1 3 Octave 1 Octave A B C 20 50 4 24 2 6 2 25 44 7 20 4 4 4 31 5 31 5 39 4 17 1 3 0 40 34 6 14 2 2 0 50 30 2 11 6 1 3 63 63 26 2 9 3 0 8 80 22 5 7 4 0 5 10...

Page 202: ...dy sound such as environmental noise To calculate Ln values the 831C creates an amplitude distribution table over the range 0 to 200 dB in amplitude increments of 0 1 dB This data permits the calculat...

Page 203: ...res We would like the microphone to measure sound pressure force per unit area instead of sound force If the pressure is applied uniformly over the microphone diaphragm a simple constant the diaphragm...

Page 204: ...from a source of sound is less than the largest dimension of the sound source In the near field effect of source geometry is significant Sound sources often have a variety of specific sources within...

Page 205: ...l form of the Sound Exposure Level where the time period is defined as the start and end times of a noise event such as the passing of an aircraft or automobile Sound Sound is comprised of rapid oscil...

Page 206: ...he square root this is called rms for root mean square This method is one of several ways to mathematically measure sound Moving Average The averaging process is continually accepting new data so it i...

Page 207: ...nergy as the actual time varying sound over the same period This descriptor is widely used It is a fixed average See Sound Pressure on page C 13 Impulse The value of an impulsive sound The reading wil...

Page 208: ...maximum A weighted fast exponential time weighted sound pressure level for each n 5 second time period and n is the number of 5 second periods accumulated during the measurement Threshold Sound Level...

Page 209: ...Vibration The oscillatory movement of a mechanical system generally taken to be solid It is used as a broad descriptor of oscillations Wavelength l The distance between peaks of a propagating wave wi...

Page 210: ...division LarsonDavis com P N I831C Rev M Firmware version 4 0 5 2019 PCB Piezotronics Inc orldwide Corporate Head uarters 3425 Walden Avenue Depew NY 14043 2495 USA Toll free in the US 888 258 3222 Ph...

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