1 Introduction - The Modal Shop, Inc.
Contents
1. Introduction Welcome to the Larson Davis Model 831 This versatile instrument with graphic display performs the functions of several instruments It puts the combined features of a precision sound level meter and a real time frequency analyzer in the palm of your hand About This Manual This manual has 27 chapters and 4 appendices covering the following topics Chapters Model 831 Technical Reference Manual Chapter 1 Introduction Orients the user to the contents of this user manual and the Model 831 features functions and measurement capabilities Chapter 2 First Use Describes the process of unpacking the Model 831 and preparing for first use Chapter 3 Overview A brief discussion of the displayed views the keypad and navigation through the various functions of the Model 831 Chapter 4 Basic Measurement Setup A detailed description of setting up the Model 831 for the measurement of basic sound level parameters Includes a description of the Setup Manager Chapter 5 Basic Data Display A detailed look at the various metrics and information presented on these screens during and following a basic sound level measurement Chapter 6 Run Control The Model 831 provides a number of run modes to control the time duration of a measurement The most simple are Manual Stop Timed Stop and Stop when Stable More advanced are the Continuous Single Block Time and Daily Timer modes which are available when t2. TRP020 20 Heavy duty 20 tripod Use with 426A12 EPS030 831 EPS029 831 EPS031 and EPS032 ACC003 Headset with microphone for voice recording playback Calibrators CAL200 Class 1 Sound Level Calibrator 94 114 dB 1 kHz CAL250 Class 1 Sound Level Calibrator 114 dB 250 Hz Soft Case CCS032 pouch with belt clip Model 831 Technical Reference Manual Software Model 831 Technical Reference Manual DNA Data Navigation and Analysis software provides setup and remote operation of the Model 831 providing real time data displays on a PC Powerful graphics routines are provided to create custom data displays ranging from simple time histories and frequency spectra to spectrograms level vs frequency vs time and annotated data presentations A variety of advanced post processing tools can be used to extend measured data to engineering results such as searching time history data for user defined events masking or modifying portions of measured data and recalculating Leq and searching spectra for pure tones DNA will take you from measured data to a completed project including report generation Features 1 15 Model 831 Components 1 16 Microphone Preamplifier LCD Display Keypad Connectors FIGURE 1 1 The Model 831 The Model 831 is a convenient hand held sound level meter real time analyzer with a simple user interface The standard Model 831 shown in FIGURE 1 1 includes the following 1
3. Wind Speed and Direction Temperature and Humidity e Jack for AC DC output or headset microphone and speaker e Compatible with 61 m 200 ft microphone extension cable full scale to 20 kHz e 4 AA batteries provide greater than 8 hour operating time e Dust tight IP53 durable plastic case with tripod mount tripod not included and lanyard e USB 2 0 full speed host connector for mass storage cellular and dial up modems and future devices e USB 2 0 full speed peripheral connector for control and data download by a PC Features 1 5 Basic Measurements Basic Operation 1 6 Features AUX control connector for USB remote power weather transducers and the 831 INT VO connector for communicating with peripheral devices such as weather transducers Multiple language support English French German Italian Norwegian Portuguese pt and br Spanish and Swedish Field upgradeable firmware SPL Leq Lmax Lmin Lpeak Lpeak max 2 RMS event counters and 3 Peak event counters Ly statistics computed to 0 01 with 0 1 dB accuracy over the range Ly 9 through Loo 99 with display of six on the meter and Histogram tables Status Bar and About display Auto Store with Auto Reset Run Timer and Stop When Stable Control Back erase Markers to annotate portions of time histories Real time clock Start time elapsed time and paused time Time stamping for Lmax Lmin Lpeak max metrics Session Log Lock functi
4. 2 in diameter condenser microphone PRM831 microphone preamplifier Backlit graphic 160 x 240 pixel LCD display 13 key soft rubber backlit keypad AC DC output control USB and external power connectors shown in FIGURE 1 2 True hand held instrument with sure grip pads Model 831 Components Model 831 Technical Reference Manual Hardware Power Switch USB Interface AC DC Output and Headset AUX Connector for USB I O Connector for 831 INT External Power Analog and Logic I O FIGURE 1 2 Model 831 Bottom View Model 831 Technical Reference Manual Model 831 Components 1 17 Model 831 Components Model 831 Technical Reference Manual
5. C DC Output Cable CBL139 Cables for Environmental Monitoring CBL152 Cable 426A12 to 831 Signal 20 CBL153 Cable 426A12 to 831 INT Control 20 CBL154 Cable 426A12 to Model 831 Control 20 CBL144 Cable PRM2100 to 831 Signal 20 CBL145 Cable PRM2100 to 831 Control 20 CBL146 Cable PRM2100 to 831 INT Control 20 Cable for use with PSA027 Universal Input Power Supply AC Power Adaptor Power Supply Model 831 Technical Reference Manual CBL140 Cable 831 Power 2 5 mm JACK 1 PSA027 Universal 90 240 AC Power Adaptor providing power from electrical outlet used to power the Model 831 in conjunction with CBL140 CBL145 or CBL154 1 25 A 2 5X5 5X14 mm Features 1 13 Tripods Other Hardware 1 14 TRP001 Instrument Camera Tripod with ADP032 1 2 in microphone clip Use with EPS2108 2 TRP002 Microphone Stand with Boom TRP003 Support Tripod heavy duty can be used with EPS029 EPS030 and EPS2106 2 ADP034 Mounting adapter to attach EPS2106 2 to TRP003 ADP091 Mounting adapter 426A12 TO TRP003 TRP019 Permanent 17 tilt down pole Use with EPS031 AND EPS032 TRP020 06 Heavy duty 6 tripod Use with 426A12 EPS030 831 AND EPS029 831 Note EPS031 AND EPS032 are not for use with this tripod TRP020 10 Heavy duty 10 tripod Use with 426A12 EPS030 831 EPS029 831 EPS031 and EPS032 TRP020 15 Heavy duty 15 tripod Use with 426A12 EPS030 831 EPS029 831 EPS031 and EPS032
6. e AA NiMH batteries Lanyard Features Optional Accessories Microphones Microphone Preamplifiers Environmental Protection 1 10 Features 1 2 free field prepolarized microphone 50 mV Pa 1 2 random incidence prepolarized microphone 50 mV Pa 1 4 free field prepolarized microphone 4 mV Pa for higher level and or higher frequency measurements ADP043 adaptor required 1 4 pressure prepolarized microphone 1 6 mV Pa for higher level and or higher frequency measurements ADP043 adaptor required 1 2 ICP Low Noise Microphone Preamplifier requires adaptor ADP074 426A12 Outdoor Microphone Preamplifier 426A12 NPT Coupler 1 5 X27 IS0228 1 to NPT thread EPS2106 2 Environmental Shell protects microphone and preamplifier from rain and wind Use with tripod TRP003 EPS2108 2 Environmental Shell protects microphone and preamplifier from rain and wind Use with tripod TRP002 EPS029 831 Weather proof enclosure for remote noise monitoring includes two batteries and microphone mast EPS030 831 Weather proof enclosure for remote noise monitoring includes battery EPS031 Pole mount weather proof fiberglass enclosure for AC power and mounting to TRO019 XX and TRP020 XX series tripods includes enclosure internal brackets and 9AH backup battery Model 831 Technical Reference Manual Model 831 Technical Reference Manual EPS032 Pole mount weather proof fiberglass enclosure for solar
7. he optional firmware 831 ELA is enabled These are all described in detail in this chapter Introduction 1 1 About This Manual Chapter 7 Making a Measurement Describes the important steps in making an accurate sound level measurement Chapter 8 Voice Recording The user is instructed in the process of recording reviewing and saving voice annotations Chapter 9 Industrial Hygiene Describes the measurement of noise dose and noise exposure using the optional firmware 831 IH Chapter 10 Time History Describes the use of the optional firmware 831 LOG for measuring time history data Chapter 11 Measurement History Describes the use of the optional firmware 831 ELA for performing a sequence of measurements using the same setup either manually or automatically Chapter 12 Noise Exceedance History Describes the use of the optional firmware 831 ELA for measuring data associated with threshold exceedance based noise events Chapter 13 RT60 Describes the RT60 instrument mode 831 RT and making reverberation time measurements Chapter 14 FFT Describes the FFT instrument mode 831 FFT and making FFT measurements Chapter 15 Sound Recording Describes the digital sound recording features associated with the optional firmware 831 SR Chapter 16 Data Explorer Learn to use the Data Explorer to view stored data files load settings from a saved data file and other operations Chapter 17 System Proper
8. nal memory or USB memory Chapter 27 Upgrade Firmware Describes the procedure for upgrading firmware versions and adding options to the Model 831 Appendix A Technical Specifications Provides a listing of acoustic electronic environmental and physical characteristics of the Model 831 Appendix B Measuring to 1EC61672 1 Provides specifications and information specifically required to appear in the manual by this standard Appendix C Integrated Level Calculations provides information on TWA Leq SEL Dose and Projected Dose calculations About This Manual 1 3 About This Manual Appendix D Glossary Contains technical definitions of key acoustic and vibration terms Model 831 Technical Reference Manual Features Hardware Features Model 831 Technical Reference Manual The Larson Davis Model 831 has the following features e Precision integrating sound level meter e 250 MB unformatted standard data memory 2 GB optional e 160 X 240 graphic LCD display with backlight and icon driven user interface e Quiet Touch elastomeric keypad e Large dynamic range gt 120 dBA e RMS Detectors Slow Fast amp Impulse e RMS Frequency Weighting A C Z e Peak Frequency Weighting A C amp Z e Any Level Simultaneous measurement and display of Max and Min sound pressure levels Slow Fast and Impulse detectors plus Leq and Peak levels all with A C and Z frequency weighting e Weather Measurements
9. nstrument mode for measuring reverberation time e FFT 831 FFT FFT Instrument mode Features 1 7 No Charge Options The following options are available at no additional charge e Weather Data Wind Speed and Direction Temperature Humidity 831 WTHR e Analog Modem or RS 232 Communication 831 MDM 1 8 Features Model 831 Technical Reference Manual Standard Accessories Some of these options may not be provided with systems designed for specific applications Microphone Preamplifier Microphone Software CD Accessory Kit Included with purchase of 831 FF or 831 RI not included when Model 831 is purchased without microphone and preamplifier Other Model 831 Technical Reference Manual The Model 831 is generally delivered with the standard accessories described below or PRM831 16 to 140 dB measurement range 377B02 1 2 free field prepolarized microphone 50 mV Pa providing performance conforming to Class 1 sound level meter standards 377B20 1 2 random incidence prepolarized microphone 50 mV Pa providing performance conforming to Class 1 sound level meter standards SLM Utility G3 software for setup control and high speed data download A CBL138 USB cable is required to utilize the software 831 ACC including 831 CCS Hard Shell Case PSA029 Universal AC Power Adaptor providing power from PC via USB port CBL138 USB to mini B cable 1 8 m WS001 3 1 2 Windscreen 4 Rechargeabl
10. ons Calibration with calibration history and list of calibrators Power management Status bar and About display Names Setup files and Setup Manager Data files and Data Explorer Model 831 Technical Reference Manual Available Options Purchase Required Options Model 831 Technical Reference Manual e Automatic data backup to prevent data loss on power failure e Overall measurement e Community Noise Measurement e Voice Annotation e GPS Data The Model 831 is delivered with all firmware options available at the time of manufacture already installed However only those options which have been purchased have been enabled Any of the other firmware options can be enabled at a later date following purchase using a file delivered from Larson Davis via the internet e Real time 1 1 amp 1 3 Octave Frequency Analysis 831 OB3 e Measurement History for the manual or timed storage of statistical data 831 ELA e Automatic Data Logging with periods from 20 ms to 24 hour 831 LOG e Fast Spectral Time History Data Logging with intervals of 2 5 5 0 or 10 ms 831 FST requires 831 LOG and 831 OB3 e Exceedance based Logging Analysis with Events 831 ELA Automatic sound recordings can also be made when the 831 SR option is also enabled e Industrial Hygiene Measurement 831 IH e Sound Recording 831 SR e 2 GB Memory 831 MEM2G e Advanced IP Communication for Cellular connectivity 831 COMM e RT60 831 RT I
11. power and mounting to TRP019 XX and TRP020 XX series tripods includes enclosure internal brackets and solar charger EPS033 Steel security band for NMS systems NMS016 Permanent noise monitoring system with weather proof enclosure and tilt down pole designed for AC power includes Model 831 EPS031 831 INT 17 pole 426A12 9AH backup battery and fiberglass enclosure NMS017 Permanent noise monitoring system with weather proof enclosure and tilt down pole designed for solar power includes Model 831 EPS032 831 INT 17 pole 425A12 solar charger and fiberglass enclosure Optional solar accessories include the following ePSA012 80 80W SOLAR PANEL PSA012 50 50W SOLAR PANEL BAT012 100AH BATTERY NMS018 Portable Noise monitoring system with weather proof enclosure and tripod designed for AC power includes Model 831 EPS031 831 INT heavy duty tripod 10 15 and 20 configurable heights 426A12 9AH back up battery and fiberglass enclosure NMS019 Permanent noise monitoring system with weather proof enclosure and tripod system designed for solar power includes Model 831 EPS032 831 INT heavy duty tripod 10 15 and 20 configurable heights 426A12 solar charger and fiberglass enclosure Optional solar accessories include the following ePSA012 80 80W Solar Panel ePSA012 50 50W Solar Panel BAT012 100AH Battery BAT013 2X21AH batteries Features 1 11 Weather Data Acquisition Communica
12. ties A discussion of instrument related functions including date time backlight language units and using the USB port Chapter 18 Non Acoustical Inputs This chapter discusses the use of external transducers and devices to provide non acoustical data to the Model 831 Included Model 831 Technical Reference Manual Model 831 Technical Reference Manual are the following 831 INT Interface Unit Weather Wind Temperature and Humidity and Location using GPS device Chapter 19 Communication The Communication Pages are used to setup communications between the Model 831 and a PC using dial up modems GSM cellular telephones and RS 232 devices Chapter 20 Lock and Unlock The Model 831 A discussion of the various scenarios to lock or unlock the Model 831 and the interaction with running a measurement Chapter 21 Calibration Describes the process of calibrating the Model 831 Chapter 22 About A look at basic Model 831 system related info2mation Chapter 23 System Utilities A description of the utilities available within the Model 831 Chapter 24 Model 831 Hardware Describes the Model 831 hardware including functionality of front panel keys connectors and interfaces Chapter 25 Parameters Measured An overview of the many parameters measured and recorded by the Model 831 Chapter 26 Memory Utilization Presents formulas to calculate the amount of memory used by the parameters which can be stored to inter
13. tion GPS 831 INT 831 Interface Unit for use with 426A12 Outdoor Microphone Preamplifier and weather sensors SEN028 Wind Monitor Speed and Direction SEN029 Anemometer Speed and Direction Low Cost SEN030 Sensor Temperature and Humidity SEN031 Sensor Vaisala Weather Station MDMUSB A Modem V 90 Dial up with USB Interface MDMUSB E Modem Edge USB Wireless Quad Band GSM DVX008A USB to RS232 9 Pin Adaptor CBL117 Serial Null Modem Cable Connects DVX008A to PC Serial Port 831 INT ET 831 INT with integrated Ethernet capability GPS001 GPS Receiver USB Magnetic Mount Equivalent Electrical Impedance Adaptor 1 12 Features An equivalent electrical impedance adapter can be used in place of the microphone when very high impedance measurements need to be made and the instrument is being tested electrically The adapter is simply a series capacitor with the same capacitance as the microphone it is replacing The following adapters will be available for sale If square wave pulse measurement is to be performed then the adapter must also be used with a 100 kHz low pass T filter ADP002 6 8pF Adaptor for 1 4 in 7pF microphone ADP090 12pF for 1 2 in 12pF microphone Model 831 Technical Reference Manual Cables Direct Input Cable or Adaptor Microphone Extension Cable EXCXXX shielded where XXX is the length in feet XXX 010 020 050 100 and 200 available USB Cable CBL138 A
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