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SoundAdvisor Model 831C

A-21

Overall Metrics

Statistics are sampled every 100ms from the selected OBA frequency weighting

and time weighting into 0.1 dB wide amplitude classes, as shown in

Table A.18

Instrument Noise Levels With OBA, by Preamp

The following charts show the 831C instrument noise levels for the OBA filter With

PRM831 and Direct Input.

FIGURE A-2

Self-Generated Noise Levels for 1/1 Octave Filter With PRM831

Linear

Exponential Units

OBA Overall Equivalent Level Spectrum

eq(f)



eq(f)

OBA Overall Maximum Level Spectrum



max(f)



max(f)

OBA Overall Minimum Level Spectrum



min(f)



min(f)

Table A.18

Units



n1(f)



n2(f)



n3(f)



n4(f)



n5(f)



n6(f)

-10.0

0.0

10.0

20.0

30.0

40.0

High +0dB

High +20dB

0dB

20dB

100

1000

10000

Содержание 831C-FFT

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

Страница 2: ...pographical errors PCB Piezotronics Inc will periodically update the material for inclusion in new editions Changes and improvements to the information described in this manual may be made at any time...

Страница 3: ...1C 48 5 1 Understanding Calibration Values 5 2 Choosing a Calibrator 5 3 Reviewing the Calibration Settings 5 4 Calibrating Your SoundAdvisor 831C Module 6 Creating a Measurement Setup 54 6 1 831C Set...

Страница 4: ...rmware Module 15 Using Measurement History 113 15 1 Setting Up a Measurement With Measurement History 15 2 Viewing Measurement History Data Files Module 16 Using Time History 120 16 1 Setting Up a Mea...

Страница 5: ...sis Software Option 831C OB3 A 5 Event Logging Software Option 831C ELA A 6 Time History Software Option 831C LOG A 7 FFT Analysis Software Specifications Option 831C FFT A 8 PTB Approved Firmware A 9...

Страница 6: ...31C refers to the full color screen G4 LD Utility software G4 connects your meter to your PC via USB WiFi or TCP IP With G4 you can calibrate the meter create setup files download measurements and ana...

Страница 7: ...ing a Precision Acoustic Calibrator and store calibration history Time stamping for Lmax Lmin Lpeak max single event metrics Sync clock with PC attached GPS or Network Time Protocol NTP Create multipl...

Страница 8: ...unications 1 3 Performance Features Large dynamic range 120 dBA RMS Detectors Slow Fast Impulse RMS Frequency Weighting A C Z Peak Frequency Weighting A C Z Any LevelTM Simultaneous measurement and di...

Страница 9: ...ailable Items SoundAdvisor 831C Microphones 377B02 inch free field prepolarized microphone 50 mV Pa providing performance conforming to Class 1 sound level meter standards 377C20 inch random incidence...

Страница 10: ...purchase date model and serial numbers for your instrument preamplifier and microphone 1 5 Available Options and Accessories In this section 1 5 1 Firmware Options 1 5 2 Hardware Options Accessory Kit...

Страница 11: ...nt 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 cellular...

Страница 12: ...Pa providing performance conforming to Class 1 sound level meter standards Microphone Preamplifier Options 426E01 inch ICP Low Noise microphone preamplifier requires adapter ADP074 PRM2103 Outdoor mic...

Страница 13: ...quare wave pulse measurement include a 100 kHz low pass T filter with the adapter ADP002 6 8pF BNC Input Adapter for inch 7 pF microphone equivalent ADP090 12 pF BNC Input Adapter for inch 12 pF micro...

Страница 14: ...On or Off 2 2 5 Using the Power Control Page 2 3 Instrument Hardware Overview 16 2 3 1 Using 831C Buttons 2 4 Display Elements Overview 19 2 4 1 Changing Display Color Themes 2 4 2 Using Tabs and Pag...

Страница 15: ...amplifier body To disconnect the microphone Lightly grip the 2 engraved lines on the microphone body and gently turn 2 1 2 Connecting the Preamplifier to Meter CAUTION Do not attempt to screw the prea...

Страница 16: ...er Events and Indications 2 2 1 Using Battery Power Current Battery Voltage is displayed on the Power Control page To access the Power Control page press the Power button 0 In the Status Bar section o...

Страница 17: ...the end of expected life the empty battery symbol begins to flash When the battery is no longer functioning the 831C stops running saves all data and instrument status then turns off When you power th...

Страница 18: ...other external power source TAKE NOTE If you re using a power cable other than the one supplied with the meter use a 28 AWG or larger wire for proper charging Understanding Charging Status LED Indicat...

Страница 19: ...h the same gauge wire to prevent excessive power loss 2 2 3 Understanding 831C Power Events and Indications Understanding a Low Voltage Shutdown Event The 831C preserves the service life of an externa...

Страница 20: ...a power check If the supplied power is too low the low power icon displays over top of the first display For more information see Table A 5 Low Power At Boot Up Understanding Low Input Power Indicato...

Страница 21: ...ware Overview FIGURE 2 5 831C Instrument Overview front 1 Standard 1 2 free field or random incidence microphone 2 PRM831 Preamplifier 3 Release button to disconnect the preamp from the meter 4 240 x...

Страница 22: ...m storage 1 to 2 weeks See 2 1 4 Prepar ing the 831C for Long Term Storage on page 11 CAUTION DO NOT use the AC DC port as 1 AUX connector intended for use with USB mass storage cellular modem GPS hea...

Страница 23: ...7 When running press Stop Store to stop press when the meter is stopped to store the measurement 3 9 Press Run Pause once to Run press while running to Pause press while Paused to resume the measureme...

Страница 24: ...2 4 1 Changing Display Color Themes The 831C has a full color back lit LCD touchscreen and allows you to select your preferred color theme The Dark theme is featured in this manual For more informati...

Страница 25: ...ys the meter measurement connection alert status and battery status as shown in Figure 2 8 FIGURE 2 8 Status Bar 1 Power Indicator 2 WiFi Status 3 SLM Indicator 4 Run Status 5 File Name 6 Measurement...

Страница 26: ...e on the meter When the USB drive is reinserted the 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 continu...

Страница 27: ...the OBA Under Range Icon flashes Measurement Status Icons FIGURE 2 10 Measurement Status Icons If the touchscreen is enabled or if you re operating the meter remotely tapping the icon produces the fo...

Страница 28: ...an also create a setup file using G4 LD Utility then transfer the file to the meter For more information see the G4 LD Utility Manual Mark Sound Type When you ve purchased and installed firmware optio...

Страница 29: ...alibrate Calibrate the microphone for accurate measurement See Module 5 Calibrating Your SoundAdvisor 831C Setup Manager Setup measurement parameters and metrics See Module 6 Creating a Measurement Se...

Страница 30: ...or Model 831C Display Elements Overview 25 2 4 6 Power Control Menu Overview To access the following actions on the Power Control menu press power 0 once Battery Information Display Brightness Power O...

Страница 31: ...Measurement Setup LEARN MORE Depending on your measurement type and installed firmware options Modules 15 18 may be helpful while creating the measurement setup file Step 3 Calibrate your 831C as sho...

Страница 32: ...e on an automated weekly schedule when using G4 and the 831C Scheduling firmware option 831C SCH which is available from Larson Davis LEARN MORE For more information on this feature see the G4 LD Util...

Страница 33: ...h a network connection from the 831C to the Internet For more information see Module 13 831C Network and Connections Step 2 You may want to consider activating the 831C network and meter security feat...

Страница 34: ...0 kB press Stop Store 7 to save it Before you begin another measurement download all internal data to an external drive or PC by using the Data File Manager or G4 LD Utility TAKE NOTE This option is n...

Страница 35: ...d storage account see 9 11 Enabling or Disabling Cloud Storage on page 92 3 3 2 Using the 831C File Storage Calculator The Memory page on the Live view provides a helpful file storage calculator that...

Страница 36: ...y in FFT Mode 47 4 1 SoundAdvisor 831C Display In SLM Mode In this section 4 1 1 Understanding the Live Tab 4 1 2 Understanding the Overall Tab 4 1 3 Viewing Weather Related Data 4 1 4 Understanding t...

Страница 37: ...ighlight this metric press Enter 5 and select a metric to display 2 This is the metric you choose in the Any Level menu on this tab The default value is LAS To open the Any Level menu highlight this m...

Страница 38: ...is is the Exceedance Trigger level you selected in the measurement setup About the Octave Band Analyzer Page TAKE NOTE This feature requires the 831C OB3 firmware option Four pages on the Live tab rel...

Страница 39: ...elector between the following options Ref Set Reference and back to the Octave 3 View References 1 2 3 4 A A C and C 4 Save the current selected values to use as a reference by selecting Set Reference...

Страница 40: ...er is installed this page provides information like temperature and humidity as well as desiccant maintenance information About the Power Page The Power page shows the meter status items as shown in F...

Страница 41: ...re failing About the Memory Page The Memory page displays a helpful data storage calculator that can help you estimate the amount of storage a measurement might require as shown in Figure 4 8 FIGURE 4...

Страница 42: ...ghting and detector from the measurement setup file It is the equivalent sound based on the run time of the measurement 3 The data graph presents info from beginning left to end right 4 This SLM metri...

Страница 43: ...during the run time of the measurement A date and time of occurrence is recorded with this event About the Octave Band Analyzer Page Overall Page TAKE NOTE This feature requires the 831C OB3 firmware...

Страница 44: ...the highlighted frequency band for the duration of the measurement Lmax Lmax is the maximum sound level of the highlighted frequency band The maximum spectrum is determined by the Max Spec setting Bin...

Страница 45: ...at highlighted band About the Ln Percentiles Page Overall Page FIGURE 4 15 An Ln percentile is a statistical measurement of the level that exceeds the selected value n percent of the time The statisti...

Страница 46: ...ach time a trigger level is exceeded during a run the counter for that level advances from 14 to 15 and the value displays in orange or red 1 of exceedances 2 Time of last exceedance About the Overloa...

Страница 47: ...by Directive 2002 49 EC of the European Parliament and of the Council of 25 June 2002 relating to the assessment and management of environmental noise It is important to verify prior to the measureme...

Страница 48: ...GURE 4 20 Sound Exposure Level Page About the Metrics Matrix Page Overall Page FIGURE 4 21 The metrics matrix page shows all the data the meter is always measuring in one page You can use the ENTER 5...

Страница 49: ...ather readings in the following locations The Live Tab Weather page as shown in Figure 4 23 Live Tab Weather Pages The Overall Tab Weather Page as shown in Figure 4 24 In the resulting data for Event...

Страница 50: ...Hail Max Rate in2 h Hail Accumulation in s In G4 weather related events and their triggers display in the following columns in the Event Time History data Gust Speed mi h Gust Dir Compass Direction 4...

Страница 51: ...equency spectra for this meter are shown in Table 4 5 To adjust the graph scale do the following a Select the Menu softkey This opens the Live Menu Resume from pause Measurement reset Calibration reco...

Страница 52: ...Tools 3 System Properties Step 2 Use the top right softkey to navigate to Displays Step 3 From the Start drop down menu choose the first page you want the meter data to display on Step 4 From the Tabs...

Страница 53: ...ing a Calibrator 50 5 3 Reviewing the Calibration Settings 50 5 4 Calibrating Your SoundAdvisor 831C 53 5 4 1 Calibrating While Using Meter Security Lock Mode 5 4 2 Performing an E A Check 5 1 Underst...

Страница 54: ...determined by the noise floor 9 14 dB LEARN MORE For more information about measurement range noise floor linearity range and max peak levels as they relate to different microphones and gain settings...

Страница 55: ...ion e g meter moved to or from 85 kPa static pressure elevation Recalibrate first then enter values if needed Outdoor Measurement When using the 426A12 Outdoor microphone and power supply or the Model...

Страница 56: ...selection from the Microphone drop down menu The actual value is calculated during calibration 2 If your calibrator has unique values use these fields to manually enter and save them 3 This preamp mic...

Страница 57: ...ion Histories Tab in the G4 LD Utility Reference Manual Step 7 Navigate to the Calibration Certification tab which shows when the meter was last certified by the factory and when it is due for recerti...

Страница 58: ...ge such as Calibration Out of Range verify that the dB level for your calibrator and your meter are the same then perform the calibration again Be sure to power the calibrator on each time 5 4 1 Calib...

Страница 59: ...File List is the first page of the Setup Manager To edit a Setup highlight it then press Enter 5 The Settings line displays the name of the Setup you are currently editing 2 To navigate to other page...

Страница 60: ...Meter Step 1 On the 831C go to Tools 3 Setup Manager Step 2 In the Setup Manager File list highlight the Default setup in the list and press Enter 5 This opens the Setup Manager pop up menu Step 3 Se...

Страница 61: ...se the right softkey to navigate to the General tab as shown in Figure 6 3 These fields are optional FIGURE 6 3 Setup Manager General Tab 1 When set this value appears as a filename prefix for all mea...

Страница 62: ...er In this example the period is the Leq of the last 1200 seconds of the measurement run time For more information see Module 17 Using Event History Firmware About Using the Gain Feature When using a...

Страница 63: ...n Max and At Lmax in the Appendix C Glossary on page C 1 5 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 o...

Страница 64: ...le 16 Using Time History Step 9 Use the right softkey to navigate to the Exceedance Triggers tab as shown in Figure 6 8 FIGURE 6 8 Setup Manager Exceedance Triggers Tab 1 SPL Trigger Levels When the m...

Страница 65: ...l of 25 June 2002 relating to the assessment and management of environmental noise Because of these recommendations and the versatility of the standard on this point it s important to verify these val...

Страница 66: ...exceedance with sound exceedance paused the wind speed must drop below the Hysteresis before the sound exceedance pause turns off TAKE NOTE The Larson Davis weather sensor SEN03x takes a running avera...

Страница 67: ...s Step 1 To save your Setup and exit the Setup Manager select Close Step 2 In the Save dialog choose Yes to save your settings Step 3 Highlight and press Enter 5 on the name of the Setup you created S...

Страница 68: ...59 Using Timed Stop Mode 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 a Enter the measurement...

Страница 69: ...stored in the Time hh mm ss field TAKE NOTE At the end of the Auto Store period the 831C saves measurement record to a new incrementally named data file throughout the day based on the Time hh mm ss T...

Страница 70: ...nter 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 Step 2 If de...

Страница 71: ...Step 1 On the meter select Menu Setup Manager Step 2 Select Default by highlighting it then pressing Enter 5 This opens a pop up menu Step 3 Highlight select Set to Active and confirm your choice if...

Страница 72: ...ing the basics of measurement making is essential Quick Measurement Steps Step 1 Power On the 831C Step 2 Navigate to Overall display Step 3 Press Run 9 Step 4 When finished press Stop 7 Step 5 Press...

Страница 73: ...Tools 3 Setup Manager and indicate or check all values desired for your measurement For complete instructions see 6 2 Creating a Custom Setup File On the Meter Step 4 Calibrate the meter For complete...

Страница 74: ...sure fluctuations on the microphone diaphragm which can produce errors in the measurement As a result when performing measurements in the presence of low level airflows we recommended that you place a...

Страница 75: ...2 2 Powering the 831C SLM on page 11 Create a measurement setup file for this measurement as shown in Module 6 Creating a Measurement Setup Complete an Area Sound Field Check as shown in 7 1 2 Perform...

Страница 76: ...he instrument and the preamplifier the Under Range icon flashes while the condition exists 7 2 1 Pausing the Measurement and Using Back Erase The measurement can be temporarily paused at any time any...

Страница 77: ...try to indicate data has been erased as shown in Figure 7 5 FIGURE 7 5 Back Erase 1 The back erase icon appears in the Session Log when a segment of the measurement is erased during a pause 2 The Time...

Страница 78: ...ement is running or paused the 831C automatically stops the measurement 7 2 3 Stopping the Measurement When you stop the 831C during a run or a pause this stops the run clock Resuming a run continues...

Страница 79: ...ter to react when a measurement stops and it s time to store a measurement record Step 1 On your 831C navigate to Tools 3 System Properties Preferences Step 2 Choose an option from the Auto Store drop...

Страница 80: ...rompted to end the first user s session before they can begin their own TRY THIS G4 LD Utility provides a simplified way to access and examine resulting data files For more information see the G4 LD U...

Страница 81: ...locations The top file is saved on the USB drive The bottom file is saved on the meter s internal memory Step 2 Use the File Manager as shown in Figure 8 3 and press Close when finished FIGURE 8 3 Usi...

Страница 82: ...Press the right or left softkeys to examine the Setup properties 8 2 3 Using Create Average Create Average takes a saved data file and adds its average as an instance to the unsaved Overall measuremen...

Страница 83: ...ming Convention Example Additional Information Manual Stop Default Data File NNN 831_Data 001 The Default Data File can be changed on the General setup page NNN represents single digits that increment...

Страница 84: ...enu Copy File to USB The data file will be copied onto the USB drive The original file will remain saved on the 831C Move File to USB The original data file moves from the internal memory to the USB d...

Страница 85: ...Pages On the Displays Tab 88 9 8 Enabling or Disabling Options 90 9 9 Setting Network Preferences 90 9 10 Configuring an Email Server On the Meter 90 9 11 Enabling or Disabling Cloud Storage 92 9 12...

Страница 86: ...e measurement before setting time otherwise the time waits to update until the next Stop 4 Close and select Yes to save your changes TAKE NOTE You can also sync the 831C with the time on your PC by us...

Страница 87: ...en your time is successfully synced with NTP servers the NTP icon appears in line with the current time on the Live and Overall tabs 9 4 Editing Power Settings In this section 9 4 1 Changing Batteries...

Страница 88: ...arger is enabled This can result in fire or injury with alkaline or lithium batteries Step 1 On your 831C go to Tools 3 System Properties Step 2 Press the right softkey until the Power tab displays St...

Страница 89: ...urement after a short 10 second power up 9 4 4 Setting the Backlights On Period On your 831C go to Tools 3 System Properties then press the right softkey until the Power tab displays Backlights On is...

Страница 90: ...olts if your battery usage is other than a standard 12V SLA battery For more information see Table A 5 on page A 7 9 5 Setting Meter Preferences In this section 9 5 1 Selecting a Microphone Correction...

Страница 91: ...unning FIGURE 9 4 831C AC DC Output Step 1 On your 831C go to Tools 3 System Properties then press the right softkey until the Preferences tab displays Table 9 1 Microphone Correction Options Option C...

Страница 92: ...ing then press Close to save your changes 9 5 4 Setting the Data Storage Location Use this feature to indicate where your data files are stored Step 1 On your 831C go to Tools 3 System Properties then...

Страница 93: ...1C has a built in language translation feature which allows you to view the meter display in the following languages English French German Italian Portuguese PT BR Norwegian Spanish Swedish Czech Turk...

Страница 94: ...elect your option from the Start drop down Your new start display appears on the next power up Customizing Tab Page Display Select an option from the Tabs drop down menu then select the checkbox in li...

Страница 95: ...o enable it again at anytime Step 4 Reboot the meter to save the changes 9 9 Setting Network Preferences See Module 13 831C Network and Connections 9 10 Configuring an Email Server On the Meter Design...

Страница 96: ...the Security level for the account Check your email provider s documentation if you need help with this FIGURE 9 7 Email Account Properties TLS Trusted CA preferred The 831C matches responding server...

Страница 97: ...il or text when a file is saved to Cloud storage When cloud storage is enabled data files continue to be stored using this method until you disable it as shown in this section Before you begin The ini...

Страница 98: ...r page displays Step 2 Select a signal trigger from the Logic In drop down menu as shown in Figure 9 9 FIGURE 9 9 System Properties Other tab A device connected to the 831C using the I O Interface cab...

Страница 99: ...t to Marker a marker for sound recording is initiated the output is activated for the Recording Time as indicated in the setup To utilize this state you must purchase install and enable the Sound Reco...

Страница 100: ...meters with the Octave Band Analysis firmware option 831C OB1 purchased and installed When you apply octave band data you have the option to choose a negative or positive A or C weighting or you can...

Страница 101: ...avigation buttons to move through the list the page scrolls down Step 3 When finished editing press Close to save your changes TRY THIS If desired you can view these reference values on the following...

Страница 102: ...her organization and can t use this feature You ve turned on Advanced Protection for your account Step 4 At the bottom choose Select app and choose the app you re using Step 5 Choose Select device cho...

Страница 103: ...r Model 831C 98 Module 10 System Information System information is contained on the About Menu On the 831C go to Tools 3 About to view the following details on 3 tabs FIGURE 10 1 About Standards Optio...

Страница 104: ...e Meter from the Meter Interface 11 1 3 Unlocking the 831C in G4 LD Utility 11 2 Using Network Security 101 11 1 Using the Meter Lock If you are concerned about preventing tampering or unauthorized us...

Страница 105: ...cked see 5 4 1 Calibrating While Using Meter Security Lock Mode Step 5 Press Close then choose Yes to save your changes Table 11 1 Allowed Operations Per Lock Mode Lock Mode Available Operations Meter...

Страница 106: ...are available only when using the 831C SLM firmware version 4 5 with G4 LD Utility software version 4 5 The SoundAdvisor 831C network security feature is intended to protect a meter from unwanted int...

Страница 107: ...ount as described in Section 2 2 of the G4 LD Utility Manual Be sure to choose a security option Step 5 Reboot the meter to update to a secure HTTPS connection TAKE NOTE If a meter is connected to you...

Страница 108: ...e most recent calibration history record is preserved as the initial entry for the new calibration history For AudCal users using Format and Restore also clears the AudCal database TAKE NOTE If a meas...

Страница 109: ...ID 105 13 2 1 Setting a Static IP Address 13 2 2 Connecting the 831C to an Email Server 13 3 Using WiFi On Your 831C 106 13 3 1 Connecting to a WiFi Network 13 3 2 Using 831C as a WiFi Access Point 13...

Страница 110: ...f power We recommended that you also connect the meter to an external power source or by USB while connected 13 2 Setting Up the Meter s Network ID Access and configure your meter s networking propert...

Страница 111: ...necting the 831C to an Email Server If you entered a DNS address as directed in 13 2 1 this process is not necessary Step 1 Obtain the IP address of your mail server Coordinate with your local IT prof...

Страница 112: ...ick Add Step 4 Verify your network connection details by clicking the newly added network in the list FIGURE 13 3 WiFi Setup 1 The signal strength indicator and secure network icon Network requires a...

Страница 113: ...3 2 2 Operating the 831C from the LD Atlas App 13 4 Disconnecting a Cloud Storage Dropbox Account When you want to disconnect a previously configured cloud storage account use this process to disconn...

Страница 114: ...arsonDavis com G4 Step 2 Double click to download 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 Fo...

Страница 115: ...irmware is upgraded Step 6 To confirm the installation do the following On 831C navigate to Tools 3 About Options to view your currently installed options Step 7 For information about customizing the...

Страница 116: ...e 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...

Страница 117: ...ou have unsaved data or are currently running a measurement the meter notifies you that a reset is needed to save the Options settings Select OK and press the Reset 1 button to reset the measurement S...

Страница 118: ...le measurement parameters 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...

Страница 119: ...s Close and save your Setup e Set it as the Active setup file f Go to Tools 3 System Properties Preferences and verify the Auto Store setting With Measurement History enabled in Manual Run Stop or Sto...

Страница 120: ...ools 3 System Properties Preferences and verify the Auto Store setting In Timed Stop mode the meter will store data after the measurement according to this setting For more information see 8 1 Setting...

Страница 121: ...uring the current measurement interval the 831C sends an alert notification via email or text when the interval ends g Select any additional settings on the Setup Manager tabs For more information see...

Страница 122: ...el 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 LAeq LCeq LZeq Lmax Lmin and all 6 values of Ln If the curren...

Страница 123: ...progress The Current tab displays data in pages just like Live or Overall and depending on the firmware options Setup values enabled Press the Up and Down buttons 8 and 2 to navigate through these pa...

Страница 124: ...surement record shift to a non spectrum page then return to the frequency spectrum display Non Spectra Displays On screens that do not contain frequency spectrum displays use the Right and Left naviga...

Страница 125: ...rement With Time History Time History describes the measured sound as a table of metrics recorded at regular intervals Before you begin Verify that firmware option 831C LOG is installed and enabled on...

Страница 126: ...ble 16 1 on page 122 shows data that is displayed for each Time History Metric depending on the Time Interval Option you select Step 5 Select any additional settings on the Setup Manager tabs For more...

Страница 127: ...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...

Страница 128: ...ager Markers Tab Step 2 If desired edit the marker names Step 3 Select the checkbox in line with the sound types which should generate sound recordings this measurement TAKE NOTE If you re also planni...

Страница 129: ...ware options and the measurement setup used the Time History screen can display data pages just like Live or Overall Press the up or down 8 2 navigation buttons to navigate through these different pag...

Страница 130: ...from the fre quency graph to the record number 2 The highlighted band is the L eq average sound level of for the duration of the measurement at that frequency 3 To learn more about octave page display...

Страница 131: ...eation of multiple exceedances when the sound level is fluctuating at or near the trigger level In this module 17 1 Setting Up the Event History Measurement 126 17 2 Storing Event Data 129 17 2 1 Usin...

Страница 132: ...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 time in...

Страница 133: ...ant to log prior to the event and after the event respectively A sample is equal to the Event Time History Period Event Samples The Event Samples value indicates the maximum number of samples you want...

Страница 134: ...tinuous Daily Auto Store With Event History 17 2 1 Using Continuous Daily Auto Store With Event History The 831C Daily Auto Store feature provides a convenient way to store measurement data especially...

Страница 135: ...ewing Event History Data on the Events Tab From the Live Tab press the right softkey until the Events tab displays After the first time interval has passed data displays on the Event History tab in si...

Страница 136: ...iewing Octave Band and Spectral Events You can view the resulting events during a measurement in progress on the Live View Events tab on pages 3 6 or after the measurement from the Measurement Events...

Страница 137: ...ctave and 1 3 Octave Event Triggers 17 4 1 Using Running Leq as an Event Trigger Using this feature if the Leq for the most recent period is greater than the set Trigger Level the meter creates an eve...

Страница 138: ...vent History Measurement on page 126 Complete steps 1 3 of that section before proceeding Purchase and install firmware option 831C OB1 or 831C OB3 Step 1 On the 831C or in G4 go to the Setup Manager...

Страница 139: ...g Level and 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 event trigge...

Страница 140: ...background noise from the trigger level calculation To calculate events based on event noise only Dynamic triggering is an appropriate method FIGURE 17 10 Event History with Dynamic Triggering 1 The...

Страница 141: ...ound tracking level is set to the following Trigger Level SPL 1 Offset Initial Background Level As the sound level increases above the background tracking level the tracking level increases at the ris...

Страница 142: ...ity measurement and analyze the resulting data on the meter This process requires the SoundAdvisor 831C with firmware version 4 6 or newer and the 831C FFT and Tonality option 831C FFT installed All o...

Страница 143: ...that came with it Step 4 Calibrate as shown in 5 3 Reviewing the Calibration Settings and 5 4 Calibrating Your SoundAdvisor 831C Recommended Next Step 18 2 Creating an FFT Setup File On the Meter 18...

Страница 144: ...ore preference and meter run preferences in a setup file which can be used for your ISO compliant FFT and Tonality measurements This section shows FFT specific properties and settings and also refers...

Страница 145: ...or bin Also note that selecting a greater number of lines increases the FFT computation time TAKE NOTE For your selected frequency resolution the SoundAdvisor 831C calculates the FFT measurement accu...

Страница 146: ...urve with side lobes to reduce any spectral leakage The spectral leakage sometimes results when a sine wave signal is captured non periodically The Hanning window is the G4 default and the most common...

Страница 147: ...Control page of the Setup Manager When using a time based meter control the measurement duration Time must be longer than the minimum period in the table The FFT History measurement history for FFT r...

Страница 148: ...number of averages required for the measurement The default value for FFTs in Average is 1 and the max value is 99 999 c If you select the checkbox in line with Enable FFT History enter a value for Re...

Страница 149: ...Run Mode b For the measurement enter a Start date and time and an End date and time c Enter values for the next 3 settings if you plan to use FFT History time history Select the mark in line with eit...

Страница 150: ...must be A weighted averaged for at least 1 minute with the Hanning window applied If your settings differ from the selected standard the 831C displays a prompt from which you can automatically choose...

Страница 151: ...Mode connect a weather sensor such as the SEN031 or SEN032 from Larson Davis and measure site conditions 18 3 1 Viewing Live Data On the Meter In this section take a tour of the live data on the mete...

Страница 152: ...raph Units displayed for the y axis depends on the transducer the default is decibel for a mic or g when you selected a transducer other than a mic You may customize the units during the measurement s...

Страница 153: ...cy span of 20 kHz and a fundamental frequency of 5 kHz only 3 harmonic cursors will display within the frequency range See Figure 18 11 and Figure 18 13 for examples of harmonic cursor displays Live D...

Страница 154: ...al lines 4 Noise Regression indicator red line 5 As on other screens press the left or right buttons 46 to advance the Manual cursor and navigate tones in the graph Be sure the cursor type is set to M...

Страница 155: ...se that do not meet the bandwidth requirements in the Tonality Standard You can navigate and view information on these bands just as if they were valid tones See Table 18 1 for details on each indicat...

Страница 156: ...the file in G4 where tonality information is calculated for display each time the file is opened For specifics on viewing data files on the 831C see 8 2 Using the File Manager on page 75 LEARN MORE F...

Страница 157: ...ng Constraints 19 4 Enabling Measurement History Sound Recording 155 19 5 Understanding Recording Settings and Sound Quality 157 19 5 1 Understanding Resolution Peak Overload and Range 19 5 2 Choosing...

Страница 158: ...nager without saving Step 7 Run a measurement and manually mark the sound types as shown in 19 2 Making a Manual Sound Recording Using Mark Sound Type 19 2 Making a Manual Sound Recording Using Mark S...

Страница 159: ...re you begin Create a setup file with Event History enabled as shown in 17 1 Setting Up the Event History Measurement on page 126 Step 1 On your meter go to Tools 3 Setup Manager Highlight your setup...

Страница 160: ...events 19 3 1 About Sound Recording Constraints Because of sound buffering demands there are constraints on the values you can set for the Minimum Duration and Pre trigger If the values you enter req...

Страница 161: ...r a Snapshot Time FIGURE 19 5 Measurement Sound Tab 1 When you select Save Event Sound the shorter one of these 2 options is included in the resulting data file either a recording of the snapshot time...

Страница 162: ...icrophone type To ensure the calibration will be accurate do the following Step 1 Press Tools 3 Calibrate Settings and reference section 5 4 Calibrating Your SoundAdvisor 831C The 831C automatically c...

Страница 163: ...we recommend using the WAV format The following table describes the approximate file size for a 60 second sound recording in each format The WAV file sizes in Table 19 2 are accurate to the nearest 5...

Страница 164: ...a sound event from the list This opens the sound player FIGURE 19 7 Session Log Playback 19 6 2 Playback After Saving in G4 After the sound recording is stored you can access it most easily from the G...

Страница 165: ...e Option 831C ELA A 31 A 6 Time History Software Option 831C LOG A 33 A 7 FFT Analysis Software Specifications Option 831C FFT A 34 A 8 PTB Approved Firmware A 36 A 9 Frequency Response A 36 A 10 Decl...

Страница 166: ...ypical Sensitivity 50 mV Pa 1 5 dB corresponding to 26 dB re 1 V Pa Frequency Response 3 15 Hz to 20 kHz 2 dB Capacitance 12 pF A 1 3 Microphone Preamplifier Specifications Model PRM831 1 2 inch diame...

Страница 167: ...0 C n a n a 26 140 25 120 26 140 25 120 21 140 16 120 10 100 8 80 Z n a n a 36 140 33 120 36 140 33 120 27 140 25 120 19 100 18 80 Typical Noise Floor1 A 8 3 0 1 16 3 15 6 16 3 15 6 12 5 12 0 5 4 5 5...

Страница 168: ...of 35 V DC bias readout 0 to 35 V Gain Control Selectable 0 or 20 dB gain Full Scale Input 0 dB Gain 14 14 Vpeak AC Full Scale Input 20 dB Gain 1 414 Vpeak AC ICP Input use ADP074 Constant current of...

Страница 169: ...10 mV dB 2 2 V maximum 0V 0dB 2V 200dB DC Output Impedance 1k 1000pF Note DC Output only while meter is running A 1 10 AC Performance Specifications A 1 11 I O Connector Specifications Provides Exter...

Страница 170: ...um NiMH Charge Time USB to power outlet not PC meter powered OFF during charging 16 hours Typical Operating Time 8 hours continuous measurement Pin Description Signal Type 1 Ground DigitalandPower Sup...

Страница 171: ...ameter s Icon Action Low External External Shutoff Voltage1 0 8 V Warning Only Internal 4 2 V Warning Only Very Low External External Shutoff Voltage 0 5 V Halts boot up process2 Internal 4 1 V Halts...

Страница 172: ...to 158 F less than 90 RH Temperature Sensitivity 0 5 dB sensitivity 10 to 50 C 14 to 122 F at 1kHz Humidity Sensitivity 0 5 dB sensitivity 25 to 90 relative humidity at 40 C 104 F at 1kHz A 1 19 Phys...

Страница 173: ...V max 4 3 V typical Flat 20 Hz to 20 kHz 5 0 V max Power Supply Voltage 15 to 36 Volts DC Output Level 1 2 power supply voltage Power Supply Current 1 9 mA typical Temperature Sensitivity 0 05 dB from...

Страница 174: ...values are at 23 C 50 RH 35 Volt supply 3 m 10 cable and equivalent microphone of 12 pF unless otherwise stated Table A 7 Continued Table A 8 Output Connector Key Pin Signal 1 Signal Ground 2 Signal...

Страница 175: ...5 89 0 01 0 016 0 04 0 06 158 49 0 01 0 016 0 05 0 05 199 53 0 01 0 016 0 05 0 05 251 19 0 01 0 016 0 05 0 05 316 23 0 01 0 016 0 05 0 05 398 11 0 00 0 016 0 05 0 05 501 19 0 00 0 016 0 05 0 05 Freq H...

Страница 176: ...indicates Free Field For microphone 377B20 RI to FF For microphone 377B02 FF to RI For microphone 377B02 with EPS2106 8 FF to RI FF to FF FF 90 For microphone 377B02 with EPS2116 FF to RI FF to FF FF...

Страница 177: ...ected by setting for RMS and Peak level to display all levels are available in an Any Level matrix A 3 5 Overall Metrics Specifications A primary frequency and time weighting is selected by setting fo...

Страница 178: ...Fmax dB Impulse Minimum LAImin LCImin LZImin dB Impulse Maximum LAImax LCImax LZImax dB Peak LApeak max LCpeak max LZpeak max dB Time Weighting A C Z Units Slow Maximum TASmin TCSmin TZSmin y m d h m...

Страница 179: ...nity Noise Day Night Level midnight to midnight LDN Daytime portion of Day Night Level Lday Tday Tnight Nighttime portion of Day Night Level LNight Tnight Tday Day Evening Night Level midnight to midn...

Страница 180: ...e stable Continuous Start manually or at power on and runs without interruption Daily Auto Store available special restart after low battery features enabled Single Block Timer Runs from a set date an...

Страница 181: ...0 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 Cen...

Страница 182: ...o 120 108 2 to 110 94 4 to 90 250 113 27 to 140 103 17 to 120 94 16 to 110 76 15 to 90 250 115 110 to 26 113 7 to 120 106 4 to 110 93 3 to 90 500 111 29 to 140 105 15 to 120 96 14 to 110 78 13 to 90 5...

Страница 183: ...0 103 18 to 120 94 17 to 110 74 16 to 90 100 121 19 to 140 119 1 to 120 111 1 to 110 98 8 to 90 125 121 20 to 140 104 17 to 120 95 16 to 110 75 15 to 90 125 120 20 to 140 119 2 to 120 111 1 to 110 99...

Страница 184: ...01 9 to 110 89 1 to 90 3150 109 31 to 140 107 13 to 120 99 11 to 110 84 6 to 90 3150 109 32 to 140 108 12 to 120 100 10 to 89 2 to 90 4000 108 32 to 140 106 14 to 120 98 12 to 110 83 7 to 90 4000 108...

Страница 185: ...evels for the OBA filter With PRM831 and Direct Input FIGURE A 2 Self Generated Noise Levels for 1 1 Octave Filter With PRM831 Linear Exponential Units OBA Overall Equivalent Level Spectrum L eq f L e...

Страница 186: ...ith OBA by Microphone The following charts Figure A 6 through Figure A 21 show the typical instrument noise level for each microphone type in Normal and High range for 1 1 and 1 3 octave bands 30 0 20...

Страница 187: ...SoundAdvisor Model 831C A 23 FIGURE A 6 377A15 831C Instrument Noise 1 1 Octave Normal Range FIGURE A 7 377A15 831C Instrument Noise 1 3 Octave Normal Range O dB Gain 2O dB Gain O dB Gain 2O dB Gain...

Страница 188: ...SoundAdvisor Model 831C A 24 FIGURE A 8 377A15 831C Instrument Noise 1 1 Octave High Range FIGURE A 9 377A15 831C Instrument Noise 1 3 Octave High Range O dB Gain 2O dB Gain O dB Gain 2O dB Gain...

Страница 189: ...SoundAdvisor Model 831C A 25 FIGURE A 10 377B02 831C Instrument Noise 1 1 Octave Normal Range FIGURE A 11 377B02 831C Instrument Noise 1 3 Octave Normal Range O dB Gain 2O dB Gain O dB Gain 2O dB Gain...

Страница 190: ...SoundAdvisor Model 831C A 26 FIGURE A 12 377B02 831C Instrument Noise 1 1 Octave High Range FIGURE A 13 377B02 831C Instrument Noise 1 3 Octave High Range 2O dB Gain O dB Gain O dB Gain 2O dB Gain...

Страница 191: ...SoundAdvisor Model 831C A 27 FIGURE A 14 377C20 831C Instrument Noise 1 1 Octave Normal Range FIGURE A 15 377C20 831C Instrument Noise 1 3 Octave Normal Range O dB Gain 2O dB Gain O dB Gain 2O dB Gain...

Страница 192: ...SoundAdvisor Model 831C A 28 FIGURE A 16 377C20 831C Instrument Noise 1 1 Octave High Range FIGURE A 17 377C20 831C Instrument Noise 1 3 Octave High Range O dB Gain 2O dB Gain O dB Gain 2O dB Gain...

Страница 193: ...SoundAdvisor Model 831C A 29 FIGURE A 18 378A04 831C Instrument Noise 1 1 Octave Normal Range FIGURE A 19 378A04 831C Instrument Noise 1 3 Octave Normal Range O dB Gain 2O dB Gain O dB Gain 2O dB Gain...

Страница 194: ...SoundAdvisor Model 831C A 30 FIGURE A 20 378A04 831C Instrument Noise 1 1 Octave High Range FIGURE A 21 378A04 831C Instrument Noise 1 3 Octave High Range O dB Gain 2O dB Gain O dB Gain 2O dB Gain...

Страница 195: ...ound tracking level Trigger Levels Selectable from 0 to 200 dB for the SPL L or Peak L peak Dynamic Trigger Offset Selectable from 3 to 99 9 dB for SPL L above background tracking level Dynamic Trigge...

Страница 196: ...eq dB Sound Exposure Level L E L E dB Sound Exposure E E E E Pa s OBA Live Equivalent LevelSpectrum requires 831C OB3 L eq f L eq f dB OBA Live Maximum LevelSpectrum requires 831C OB3 L max f L max f...

Страница 197: ...q Period 20ms LAeq LCeq LZeq LAPeak LCpeak LZpeak Period 100 ms LAeq LCeq LZeq LApeak LCpeak LZpeak LAS LAF LAI LCS LCF LCI LZS LZF LZI LASmax LAFmax LAImax LCSmax LCFmax LCImax LZSmax LZFmax LZImax L...

Страница 198: ...I O interface cable CBL170 A 7 3 FFT History This setting enables measurement history records for any of the following available run modes Manual Run Stop Measurements run and stop manual from any of...

Страница 199: ...31C reports data in dB re 20 uPa and the integration feature is not available For Vibration Measurements SoundAdvisor Model 831C ADP074 Cable ICP accelerometer When configured for vibration the meter...

Страница 200: ...d firmware must be installed Must be using a PRM831 or PRM2103 preamp Must be using a 377B02 microphone Calibration must be within 1 5 dB of the certified sensitivity Microphone corrections must be on...

Страница 201: ...odel 831C A 37 A 9 1 Plane Parallel To Display Screen FIGURE A 22 Model 831 with 377B02 Microphone 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 200 2000 20000 Decibels dB re 1000 Hz 0 Frequency Hz 20 60 100 140...

Страница 202: ...e FIGURE A 24 Model 831 with 377B02 Microphone 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 200 2000 20000 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 0 200 200...

Страница 203: ...onal Characteristics 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 200 2000 20000 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...

Страница 204: ...320 330 340 350 281 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 22 18 14 10 6 2 2 0 10 20 30 40 50 60 7...

Страница 205: ...10 320 330 340 350 298 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 Frequency Hz 22 18 14 10 6 2 2 0 10 20 30 40 50 60...

Страница 206: ...SoundAdvisor Model 831C A 42 FIGURE A 31 Model 831C with 377C20 Microphone FIGURE A 32 Model 831C with 377C20 Microphone...

Страница 207: ...SoundAdvisor Model 831C A 43 FIGURE A 33 Model 831C with 377C20 Microphone FIGURE A 34 Model 831C with 377C20 Microphone...

Страница 208: ...SoundAdvisor Model 831C A 44 FIGURE A 35 Model 831C with 377C20 Microphone FIGURE A 36 Model 831C with 377C20 Microphone...

Страница 209: ...SoundAdvisor Model 831C A 45 FIGURE A 37 Model 831C with 377C20 Microphone A 9 2 Perpendicular to Plane of Display Screen FIGURE A 38...

Страница 210: ...del 831C with 377B02 Microphone 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 200 2000 20000 Decibels dB re 1000 Hz 0 Frequency Hz 20 340 60 300 100 260 140 220 180 Mic at n 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 20...

Страница 211: ...831C with 377B02 Microphone 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 200 2000 20000 Decibels dB re 1000 Hz 0 Frequency Hz 0 30 330 70 290 110 250 150 210 Mic at n 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 200 200...

Страница 212: ...190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 266 335 422 531 668 841 1059 1334 1679 2113 2661 3350 4217 5309 6683 8414 10593 Frequency Hz 22 18 14 10 6 2 2 0 10 20 30 40 50 60 7...

Страница 213: ...190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 299 376 473 596 750 944 1189 1496 1884 2371 2985 3758 4732 5957 7499 9441 11885 Frequency Hz 22 18 14 10 6 2 2 0 10 20 30 40 50 60 7...

Страница 214: ...SoundAdvisor Model 831C A 50 FIGURE A 47 Model 831C with 377C20 Microphone...

Страница 215: ...SoundAdvisor Model 831C A 51 FIGURE A 48 Model 831C with 377C20 Microphone...

Страница 216: ...SoundAdvisor Model 831C A 52 FIGURE A 49 Model 831C with 377C20 Microphone...

Страница 217: ...SoundAdvisor Model 831C A 53 FIGURE A 50 Model 831C with 377C20 Microphone FIGURE A 51 Model 831C with 377C20 Microphone...

Страница 218: ...SoundAdvisor Model 831C A 54 FIGURE A 52 Model 831C with 377C20 Microphone FIGURE A 53 Model 831C with 377C20 Microphone...

Страница 219: ...Mic A 9 4 Typical Z Weight Frequency Response For frequency responses of the Model 831C with the PRM2103 preamplifier see the Larson Davis PRM2103 Outdoor Microphone Preamplifier Manual FIGURE A 55 Z...

Страница 220: ...04 Low Noise Microphone and Preamplifier combination Because of this the directional response characteristics don t include the case reflections often shown with other microphone setups FIGURE A 56 83...

Страница 221: ...SoundAdvisor Model 831C A 57 FIGURE A 58 831C With LOWN Mic Set FIGURE A 59 831C With LOWN Mic Set...

Страница 222: ...SoundAdvisor Model 831C A 58 FIGURE A 60 831C With LOWN Mic Set FIGURE A 61 831C With LOWN Mic Set...

Страница 223: ...SoundAdvisor Model 831C A 59 A 10 Declaration of Conformity...

Страница 224: ...ed levels used for periodic measurements e Frequency Response and Corrections See Table A 10 Correction Filters for SLM with PRM831 and 377B02 Microphone on page 12 A Table B 1 831C with PRM831 and 37...

Страница 225: ...30 0 26 0 26 0 35 3349 65 0 01 0 01 0 11 0 12 0 12 0 35 3548 13 0 13 0 13 0 01 0 14 0 14 0 35 3758 37 0 10 0 10 0 00 0 10 0 10 0 35 3981 07 0 10 0 10 0 00 0 10 0 10 0 35 4216 97 0 03 0 03 0 20 0 23 0...

Страница 226: ...5 30 45 60 75 90 105 120 135 150 165 180 251 19 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 266 07 0 00 0 00 0 03 0 03 0 00 0 00 0 00 0 03 0 03 0 00 0 03 0 03 0 00 281 84 0 00 0 1...

Страница 227: ...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...

Страница 228: ...3 0 50 0 50 9440 61 0 37 0 40 0 37 0 50 0 67 0 70 0 70 0 83 0 77 0 90 0 93 0 77 0 60 10000 00 0 13 0 20 0 27 0 43 0 57 0 57 0 77 0 83 0 77 0 90 0 97 0 90 0 70 10592 54 0 20 0 20 0 17 0 40 0 47 0 47 0...

Страница 229: ...he appropriate filter selection in the sound level meter for a given test as well as the associated correction factor to be applied Note that the correction factors are tabulated in Table B 4 Table B...

Страница 230: ...Hz dB dB dB dB 63 10 0 00 0 00 0 00 0 20 79 43 0 00 0 00 0 00 0 20 100 00 0 00 0 00 0 00 0 20 125 89 0 00 0 00 0 00 0 20 158 49 0 00 0 00 0 00 0 20 199 53 0 04 0 00 0 00 0 20 251 19 0 07 0 00 0 00 0...

Страница 231: ...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 20 891 25 0...

Страница 232: ...0 3349 65 0 66 0 69 0 68 0 20 3548 13 0 41 0 70 0 79 0 20 3758 37 0 21 1 05 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 50...

Страница 233: ...6 10 06 9 40 0 30 19952 62 8 15 11 24 10 80 0 30 Table B 5 Linearity Range Nominal Values Weighting Gain 31 5 Hz 1 kHz 4 kHz 8 kHz 12 5 kHz Lower Upper Lower Upper Lower Upper Lower Upper Lower Upper...

Страница 234: ...ill shut off to ensure that no data is 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...

Страница 235: ...ne extension cable between the PRM831 and meter o AC Power and Radio Frequency Susceptibility The mode of operation of the 831C that produced the least immunity to the effects of exposure to AC power...

Страница 236: ...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 the Max Spec sett...

Страница 237: ...ht The levels for the hourly periods between 7 p m and 10 p m have 5 added to them to repre sent a lessened tolerance for noise during evening activities They are energy summed and converted to an ave...

Страница 238: ...or noise during sleeping hours The same occurs from 10 p m to midnight They are energy summed and converted to an average noise exposure rating Decibel dB A logarithmic form of any measured physical q...

Страница 239: ...10 decibels It is not possible to directly add or subtract decibel values since addition of logarithmic values correspond to multiplication of the original quantity Each time the sound pressure level...

Страница 240: ...hoice for the Detector setting Slow Fast or Impulse determines the amplitude change rate The detector first squares the sound signal then averages it in accordance with the time weighting characterist...

Страница 241: ...are given in the table below Standard ANSI S12 19 Exponential Integration The alternative to Linear Integration for the 831C SLM Exponential integration shows a long decay of energy after an impulse...

Страница 242: ...the frequency spectrum on the sound or vibra tion into a part that is unchanged and a part that is filtered out It can be composed of one or more of the following types Low Pass A frequency filter tha...

Страница 243: ...s of sound This weight ing is most often used for evaluation of machinery and mechanical sounds See table below Flat Weighting A filter that does not adjust the amplitude of a frequency spectrum It is...

Страница 244: ...ional information see Exponential Integration Ln Value The Ln value is the sound level that has exceeded n over the total measurement time For exam ple if n 90 a displayed value of 35dB for L90 means...

Страница 245: ...waves impinging on the microphone from all directions What a microphone measures A microphone detects more than just sound The motion of a microphone diaphragm is in response to a force acting on it...

Страница 246: ...your body at right angles to the direction of the sound you are interested in and hold the meter as far from your body as possible Use a tripod whenever possible 2 Measure the influence of other sourc...

Страница 247: ...gy at each frequency In this respect it is sim ilar to white light Noise Dose Dose It is the percentage of time a person is exposed to noise that is potentially damaging to hearing Zero represents no...

Страница 248: ...tab For details see 18 3 Making the FFT Measurement on page 145 For details on defining a regression range see ISO 1966 2 C 4 4 Single Event Noise Exposure Level SENEL LAX The Single Event Noise Expos...

Страница 249: ...n Pascals Pa or Newtons per square meter which is a metric equivalent of pounds per square inch To measure sound a sound level meter uses a detector to separate the oscillating pressure from the stead...

Страница 250: ...sound pressure of 20 Pa The square of the sound pressure is a power like quantity that can be expressed in the original form of the level definition Sound Pressure Level can be converted to sound pre...

Страница 251: ...ured in meters per second It should not be confused with sound or particle velocity which relates to the physical motion of the medium itself Spectrum Frequency Spectrum The amplitude of sound or vibr...

Страница 252: ...lowest and is commonly used in envi ronmental noise measurements Fast The time constant is 1 8 second 125 ms This is a less commonly used weighting but will detect changes in sound level more rapidly...

Страница 253: ...d to the wavelength of sound and is used to compare the size of objects rel ative to the wavelength or the time delay in sound propagation It is related to wavelength through the following equation wh...

Страница 254: ...P N I831C 01 Rev O SoundAdvisor 831C Reference Manual firmware version 4 6 2021 PCB Piezotronics Inc Worldwide Corporate Headquarters 3425 Walden Avenue Depew NY 14043 2495 USA Toll free in the US 888...

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