Standard 1/2 inch Free Field or Random Incidence Microphone Integrated Preamplifier Collar to Eliminate Reflections Applications: n n n n n Class 1 sound measurements to the latest international standards Environmental noise assessment and monitoring Reverberation time measurement and building acoustics Tonality Occupational noise evaluation n n n n n n Features: n n n n n n n n n n n n n IEC 61672-1:2013, ANSI S1.4-2014 Class 1 integrating sound level meter Real-time frequency analysis in 1/1 and 1/3 octave bands, compliant with IEC 61260:2001 and ANSI S1.11-2004 Class 1 Large, high-resolution screen, easily readable in bright sunlight Robust battery life (24 hours on 4 X AA Lithium batteries) Simplified system and measurement set-up through a “mobile phone like” interface Lightweight, ergonometric design Soft keypad for 1-handed operation Standard USB interface Dynamic range in excess of 120 dB Logging of broadband and spectral data to obtain time, measurement and event histories on the instrument Sound recording in .wav format for event, manual or time-based trigger Utility software included for set-up, archiving, export and reporting Supplied with heavy-duty Pelican® carrying case HPD selection Noise reduction validation Product quality control NVH correlation In-Situ sound power measurements Code enforcement Large High Resolution Display One-button Access to Measurement Set-up Fig.1 Run/Pause Control Model 831 Layout Display Navigation Dual Purpose Start/Stop Back-lit Navigational Keypad Reset/Clear Memory System Set-up Access Recessed On/Off Button Headphone Jack/Noise Source Control USB Host (Thumb Drive Storage, GPS Receiver) USB Power Master Power Toggle The Pelican trademark is a registered trademark of Pelican Products, Inc. Larson Davis | Toll-Free in USA 888.258.3222 | Phone: 716.926.8243 | www.larsondavis.com Multi-function Connector (External Power, Weather Sensor Input) Introduction The Larson Davis Model 831 Class 1 Sound Level Meter, with its high definition display, is extremely versatile, performing the functions of several instruments. It puts the combined features of a precision Class 1 sound level meter, environmental noise analyzer, personal noise dosimeter, and a real-time frequency analyzer in the palm of your hand. The Model 831 is a fifth generation Larson Davis sound level meter, designed for simple, singlehanded operation, yet is fully featured, smart and versatile with an ever expanding firmware platform. The design of the Model 831 was based on countless inputs from customers. It expands upon the Larson Davis tradition of delivering value, innovation and function in a rugged, single-handed, expandable package and is backed by a 2-year factory warranty, 24-hour application support and accredited factory service/calibration. The Model 831 Standard Features: n n n n n n n n n n n n n IEC 61672-1:2013, ANSI S1.4-2014 Class 1 integrating sound level meter Voice Annotation ANY LEVEL Display User-programmable run modes Six user-selectable statistics (Ln) Threshold exceedance data Community noise calculations (Lden, CNEL) GPS support Back erase functionality Normalized spectrum User-selectable screen layout and lockable set-up protection Remote access and field upgradable Wide variety of non-proprietary powering options including – 4XAA internal batteries, AC, USB and external batteries Model 831 Firmware Options: Code Description 831-OB3 1/1 and 1/3, Class 1, octave band spectral analysis 831-IH Industrial Hygiene or personal noise dosimetry 831-LOG Time history logging at periods from 20 ms to 24 hrs 831-FST Fast time history logging at 2.5, 5 or 10 ms periods Automatic event detection, event history, and measurement history (1 min to 99 hour intervals) combine with 831-LOG for event time history and 831-SR for event sound recording Sound Recording to .wav files at 8, 16, 24 or 48 kHz 831-ELA 831-SR 831-RT Reverberation time measurement, computation and display 831-FFT Fast Fourier Transform up to 6400 lines 831-COMM Advanced digital communications via cellular modem 831-MSR Measurement History and Sound Recording Supported PC Software: n n n n SLM Utility-G4 – PC software supplied with the Model 831 that supports full sound level meter control, in the field firmware and option upgrades, data export to Excel®, and includes an integrated “Screen Grabber” to display the SLM screen live on a PC DNA – the analysis, post-processing and reporting tool for sound and vibration measurements. DNA delivers enhanced analysis capability, sound playback and graphical reporting. Graphs can be annotated and shared amongst multiple users using DNA reader software. Software Development Kit (SDK) – toolkit for developing custom applications in MS Windows® or Linux for the Model 831 3rd Party – the Model 831 has been integrated into various 3rd party software packages including software for airport noise management The Model 831 offers a complete solution for noise measurement. Whether in the office or in the field, the Model 831 can handle your sound measurement needs. Excel is a registered trademark of Microsoft Corporation in the United States and/or other countries. Larson Davis | Toll-Free in USA 888.258.3222 | Phone: 716.926.8243 | www.larsondavis.com DID YOU KNOW… …We Carefully Considered Every Design Element Keyboard Features: Much care was taken when designing the Model 831 keyboard. To reduce extraneous noise, the keys are manufactured of silicone to eliminate audible “clicks”. In addition, the ON/OFF button is slightly recessed to avoid accidental power off. Together with the backlit display, the illuminated keyboard permits nightly operation indoors as well as outdoors. Finally, a raised thumbrest allows for careful positioning during measurements. Avoid Acoustic Reflections: To reduce noise reflections further, a noise cone was added between the preamplifier and the sound level meter body. The keypad is situated below the screen for ease of use and is slightly lower in height which positions the user’s hand lower on the body allowing a free flow of acoustic waves. The preamplifier connection, the bulkier head, and the lowered keypad all contribute to the Model 831 Class 1 designation. Larson Davis | Toll-Free in USA 888.258.3222 | Phone: 716.926.8243 | www.larsondavis.com Material Features: When selecting manufacturing materials, the day-to-day operation for users was taken into account. Advanced sound level meters like Model 831 are often used outside. The display with high readability in all lighting conditions is protected by a scratch resistant cover. A high impact plastic housing supports and safeguards the instrument for normal use. Access Features: The large battery access panel allows for easy exchange of batteries. Extra connections are grouped at the bottom of the instrument with PC control and power supply combined via a single cable. Single-handed Operation: To reduce acoustic reflections during measurement, Model 831 was designed with single-handed operation in mind. The soft grips combined with the overall inverted cone shape allow the meter to easily fit in the hand, without permanent finger pressure or user attention. For extra security a lanyard is provided as a standard accessory. Larson Davis | Toll-Free in USA 888.258.3222 | Phone: 716.926.8243 | www.larsondavis.com Standard Features When performing noise surveys, it is important to have a fully capable sound level meter at your fingertips to capture all of the essential data. How many times have you brought along additional equipment to log information such as GPS location, temperature, wind speed, and other environmental parameters? Then, how much time did you spend after the test merging that non-acoustic data into a report? Have you ever lost your measurement notes, or worse, forgot to log the information properly and then had to either go back and reacquire the data altogether or simply not report it? At Larson Davis, we recognize the value of measuring non-acoustic parameters in parallel with the acoustic data. The Model 831 firmware allows you to connect a variety of external sensors to log these non-acoustic parameters. Extended Power Operation Model EPS031 Fiberglass NMS enclosure (AC power) A variety of powering options allows for flexibility when out in the field. There is no need to worry about proprietary batteries, cables, etc. since most power options are “off-the-shelf items”. Great care was taken during the design of the Model 831 to ensure low power consumption, further extending measurement time. With (4) Lithium AA batteries, up to 24 hours of 1 second LAeq with 1/3 octave data can be measured. Options include: n n n AA batteries: Alkaline, NiMH rechargeable or 1.5V Lithium USB power from a universal AC power supply (PSA027), a PC or a powered USB hub 12 VDC from a DC power adaptor, 12 VDC battery, or car power connector When using 12 VDC, the Model 831 can sense a low voltage condition and shut itself down automatically then restart automatically upon power restoration to protect external batteries from damage due to over-discharge. Larson Davis | Toll-Free in USA 888.258.3222 | Phone: 716.926.8243 | www.larsondavis.com ANY LEVEL Available Broadband Metrics The Larson Davis Model 831 provides an ANY LEVEL feature to preview and review acquired sound field measurements utilizing multiple time weightings (Slow, Fast & Impulsive) and frequency weightings (A, C & Z). This feature allows the operator to easily view and acquire measurement data with the desired settings and ensures the correct values are measured. With the 831-LOG option all of the various measurement parameters are available and can simply be selected for storage and download. Pre-selected detector and frequency weighting are used to determine the metric sampled for statistical and event data. The Model 831 has six (6) measurement control modes to accommodate a variety of field situations. n n n n n LEQ,1s LwS LwF LwI MANUAL – typically used for walk-around surveys. Ideally used with the Measurement History (MH) to give a quick overview of the averages, the min-max values, and store multiple measurements into a single file. TIMED STOP – operates for a specified period of time CONTINUOUS – typically used for longer term monitoring, it allows storage of data files daily or even multiple times during the day. In this mode the Model 831 will start automatically upon powering. This is required for instances of power failure in remote locations. STOP WHEN STABLE – typically used to assess workplace noise exposure, it stops when the LAeq is stabilized in a narrow range SINGLE BLOCK – a start and stop timer controls the sound data acquisition MULTI-BLOCK – three separate time periods, of which one can cross the dateline A 3 3 3 3 3 3 Overall A LwS,Min LwF, Min LwI, Min LwS LwF LwI LPEAK Z 3 3 LwF, Max LwI, Max C 3 LPEAK LEQ LwS,Max Six Different Run Modes n Live 3 3 3 C 3 3 3 Z 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 Fig. 1 3 ANY LEVEL allows the display of all acoustic parameters simultaneously 3 3 3 3 3 NoiseTutor Environmental Noise Monitoring System Larson Davis | Toll-Free in USA 888.258.3222 | Phone: 716.926.8243 | www.larsondavis.com Normalized Spectrum Fig. 2 Live Display of Triggers During Measurement 831-OB3 Frequency Analysis firmware allows the user to compare the frequency content of various measurements using the Normalized Spectrum function. Inverse A and C weighting filters can be applied, as well as user defined curves to current measurements and graph them relative to each other. For example, when comparing the noise signatures of various machines, a reference measurement can be saved such that subsequent measurements can easily be compared. Fig. 3 Normalized Spectrum Display Two RMS and Three Peak Threshold Triggers Fig. 4 Another standard feature of the Model 831 is the ability to define up to two (2) RMS and three (3) Peak threshold levels. During operation, Model 831 will count the number of threshold exceedances as well as the cumulative time of exceedance. This information is available real-time on the instrument display as well as included on any measurement files transferred to software. This is an ideal way to keep track of limit and action values according to EU Directive 2003/10/EC. Trigger Levels Back Erase Simple transient noises such as an ambulance siren or dog bark can erroneously contribute to an outdoor measurement. The Model 831 includes a Back Erase feature allowing for the removal of the last 5 or 10 seconds of a measurement and recalculate the measurement parameters automatically. To ensure proper bookkeeping, the data is annotated so it can easily be identified post test. Fig. 5 Back Erase Display Larson Davis | Toll-Free in USA 888.258.3222 | Phone: 716.926.8243 | www.larsondavis.com Voice Recorder The Model 831 allows for annotative noise measurements with a voice memo via a headset plugged into the AC/DC output jack or directly through the condenser microphone. Information can be played back through a headset directly connected to the instrument or by downloading the data file to a PC. Fig. 6 Voice Recorder Ten Annotation Markers To further annotate data in the field, the Model 831 allows the user to enter up to ten (10) user-defined Markers which are easily accessed through the main measurement screen. For example, during a traffic noise measurement, markers such as “Truck” or “Motorcycle” can be queued such that they are quickly ready to identify certain events. Time history data is then tagged with this Marker for ease of reporting. When equipped with the optional 831-SR Sound Recording firmware, the Model 831 will also automatically take a .wav file sound recording when a Marker is engaged. Fig. 7 Model 831 with optional 831-SR Sound Recording Firmware. One screen access to manual sound recordings and exceedance markers. User-selectable Screen Layout The powerful Model 831 user interface can be tailored for a wide-variety of end users. While the acoustical consultant may like to see all data parameters, a code enforcement officer may simply like to read the Leq or Peak dB level. In addition, the sound level meter may be utilized by untrained personnel who are unfamiliar with the set-up of the instrument. In this situation, the Model 831 provides a lock feature so that set-up parameters cannot be modified without entering a security code. Modifying the user interface of the Model 831 is easily done via the keypad or SLM Utility G4 Software. Various set-ups and configurations can be created within G4 and transferred to the sound level meter such that they are easily accessible. Fig. 8 Customizing Model 831 Instrument Displays utilizing SLM Utility-G4 Software Larson Davis | Toll-Free in USA 888.258.3222 | Phone: 716.926.8243 | www.larsondavis.com Weather Measurements The Model 831 can be configured to log weather parameter data in the Time History along with all of the normal acoustic parameters at rates up to 1 sps (sample per second). A wide range of meteorological parameters are available including wind speed, wind direction, temperature, humidity and rain fall. Combined Meteorological Unit (SEN031 Vaisala WXT520) Measurement Method Connectivity Measured Parameters Digitized sensors with ultrasonic wind sensors over serial port to USB USB to Model 831 or 831-INT (-ET) Wind speed and direction, temperature, relative humidity, barometric pressure, rain fall and hail Router Fig. 9 Broadband Model 831-INT Docking Station – Configuration Internet Larson Davis | Toll-Free in USA 888.258.3222 | Phone: 716.926.8243 | www.larsondavis.com Sierra Wireless LS300 Gateway (COM-LS300-DC) Vaisala WXT520 (SEN031) Wind/Temp/Rain/Hail USB to Model 831 Fig. 10 Noise map created using web-based GPS mapping Global Positioning System (GPS) Commonly, users want the ability to use GPS to log the location for each measurement, which is very beneficial when performing environmental noise surveys that require multiple points around large buildings or when mapping noise along a roadway. To meet this need, every Model 831 Sound Level Meter is equipped with firmware to decode and log GPS position information from an optional external GPS antenna (GPS001). When enabled, the GPS will log in position automatically at the beginning of each measurement run (831-ELA). In addition, the GPS signal also includes a highly accurate clock that the Model 831 can use to automatically update its internal clock as needed. Once the data is downloaded to a PC, the location information can be easily imported into mapping software to create, in seconds, a very powerful report showing exactly where noise measurements were made. Location and Timestamp with GPS001 Time Synchronization Automatically performed with daily auto-store Location Latitude, longitude and altitude with measurement history Fig. 11 Export the “Measurement History” tab directly into a web-based GPS mapping software (shown above). This tool will retrieve the appropriate map and add the acoustic parameters to the map automatically. Model GPS001 Used with permission from Microsoft. Excel is a registered trademark of Microsoft Corporation in the United States and/or other countries. Larson Davis | Toll-Free in USA 888.258.3222 | Phone: 716.926.8243 | www.larsondavis.com Model 831 Options: Octave Band Analysis (831-OB3) Fig. 12 Fig. 13 1/1 Octave Display 1/3 Octave Display In many applications, it is important to acquire both the broadband level and spectral content of noise data. With spectral information, the source and content of the measured overall level can be better understood. Constant percentage bandwidth filters (1/1 or 1/3 octave) best approximate human perception to sound. Option 831-OB3 firmware enables simultaneous real time measurement of 1/1 and 1/3 octave Leq, Lmax, Lmin along with all the ANY LEVEL broadband parameters. Option 831-OB3 is compliant with IEC 61260:2001 Class 1 and ANSI S1.11-2004 Class 1 standards and covers the entire frequency range of human hearing: 6.3 Hz to 20 kHz for 1/3 octave bands. When 831-OB3 is combined with Time History Logging (831-LOG) or Automatic Event Detection and Event History (831-ELA) it is possible to review the frequency content of logged data or specific events. Fig. 14 Events Extracted from Noisy Data Fig. 15 Spectrogram of Events with High Frequency Noise Larson Davis | Toll-Free in USA 888.258.3222 | Phone: 716.926.8243 | www.larsondavis.com Industrial Hygiene (831-IH) The Model 831 is available with two (2) virtual noise dosimeters compliant with ANSI S1.25 and IEC 61252:2001, each with programmable threshold levels. This is very convenient when performing worker noise exposure assessment when coupled with the 1/1 octave band spectral analysis for hearing protection device selection. Typically, the characteristics of the hearing protectors are stored as one of the four reference curves on the Model 831 for easy on-site “what-if” measurements. Logging (831-LOG) & Fast Logging (831-FST) Fig. 16 DNA Software Time History and Hourly Interval Graph with Color Spectrogram The Model 831 can be used to record the evolution of sound pressure level over time as a Time History (TH). The Time History is then used to profile the observation period, which can vary from a couple of seconds to continuous monitoring. Larson Davis has enhanced the versatility of the Model 831 Sound Level Meter with the addition of Time History Logging Firmware (831-LOG). Users can pre-select from logging periods as small as 20 ms to a full 24 hrs. With time periods greater than or equal to 100 ms, up to 58 selectable parameters can be chosen. Selections consist of familiar acoustic metrics as well as non-acoustic metrics, such as battery condition, outdoor microphone performance and meteorological data (831-WTHR). Special acquisition circumstances may require the user to acquire time-based data swifter than 20 ms. For these occasions, Larson Davis offers 831-FST firmware, which adds the additional sampling rate options of 2.5, 5, and 10 ms. Fig. 17 Time History Parameter Selection in SLM Utility-G3 Larson Davis | Toll-Free in USA 888.258.3222 | Phone: 716.926.8243 | www.larsondavis.com Measurement History (831-ELA) While time histories are typically logged at one sample per second, it is convenient to view longer term averages of measurement data to more easily ascertain trends, i.e. 10 minute or one hour averages of various noise parameters. The 831-ELA firmware enables Measurement History (MH) which logs parameters similar to the Time History (TH) yet looks at the average, minimum and maximum over the selected interval time. MH and TH can run in parallel or independently. MH records are time-based when run mode = continuous, but in other run modes like manual, they are not. One of the benefits of MH history is the ability to make a series of smaller measurements. MH records and combines measurements automatically into a single composite measurement and puts everything into one file. When the Model 831 is set to “Manual Run” mode, MH history can be used to construct a noise survey. Data for each measurement or location is saved individually and may include the Leq, Lmax, Lmin, SPL, and statistical distribution of the SPL (Ln). MH records are available for easy review on the Model 831. The current measurement is visible on the “Current” display tab, while completed measurements can be browsed in the “Measurements” tab. When combined with 831-LOG, the time history detail of each measurement can be viewed quickly using keypad shortcuts. Finally, an automated sound recording at the beginning of each measurement can be achieved with 831SR firmware. Fig. 18 Current Measurement Fig. 19 Measurement History Automatic Event Detection and Event History (831-ELA) Display Summary Display In the Model 831 events are defined as either: n n n Exceedance of a fixed threshold level for a minimum duration Exceedance of a dynamic threshold level for a minimum duration External trigger set by the digital input signal Fig. 20 Event Definition on the Model 831 The Model 831 includes basic exceedance logging functionality (see “Threshold Triggers”on page 8). However, only the number of exceedances and cumulative time above threshold values is provided. With 831-ELA firmware, you are able to define the attributes of an event including threshold level, duration and hysteresis. An event is considered “Valid” when it meets these criteria and ends when the SPL drops below the threshold level for a specific period of time (Continuation Period). The user is provided triggering status updates via triggering icon graphics, helping to identify event progression and qualification (see graph above). The “Event” tab contains detailed information on each event including: n n n n n Time and duration of Event Leq, Lmin, Lmax and Peak SPL Frequency analysis of event (with 831-OB3) Sound recording in .wav format for source characterization (with 831-SR) Event time history (with 831-LOG). Time history period can be different than that used in overall TH measurement. Fig. 21 DNA Software – TH with embedded .wav files on event, color spectrogram, L95 and 1/3 octave frequency analysis A “Dynamic” trigger method can also be selected in the Model 831. The dynamic trigger is set to trigger when L85, L90 or L95 is exceeded by a predetermined number of decibels. A rise time can also be specified to determine how quickly the meter responds to changes in the background noise level. By utilizing the dynamic trigger, the number of false triggers is reduced and events (significant noise above background level) are better determined. Larson Davis | Toll-Free in USA 888.258.3222 | Phone: 716.926.8243 | www.larsondavis.com Fig. 22 Event Detection Display on the Model 831 Hear the Sound Being Measured (831-SR) Measuring sound levels is a well-accepted way to objectively quantify the noise radiated by a product in an environmental survey. But a sound pressure level or octave data only provides part of the overall acoustic picture. How many times were you asked “are you sure that the spike in the data is actually the noise of the product or the actual environmental event of interest?” Rather than rely simply on the ‘objective’ data why not record a sample of the sound to truly determine if that elevated noise level was a police car driving past with its sirens on or a noisy dog barking at the letter carrier. When recording raw time samples for playback, users can add the 831-SR firmware option. This option allows for high fidelity recordings up to 48 kHz sampling with the Model 831 either manually or automatically, based on an array of triggering options. Option 831-SR Features: User-initiated Recordings: n n Manual Sound Recording - User-controlled recording duration, acquired during operation, up to 48 kHz Marker-based Sound Recording - User-initiated with userdefined duration, acquired during operation, up to 48 kHz Automatic Recording Mode: When the 831-SR option is combined with other advanced logging functionality in the Model 831, it is possible to start and stop recordings based on a number of advanced measurement events. This allows the user to only record sounds associated with specific noises as they occur rather than recording many hours of data and having to ‘find’ these events after the fact in post processing software. Option 831-ELA Recordings: n Event History Sound Recordings - Acquired upon events meeting preset conditions with fixed or dynamic triggering available n Measurement History Sound Recordings - Automated sound recording at the beginning of each Measurement History Note: Event & Measurement Sound Recordings can be enabled at the same time. These recordings can then be downloaded to a PC and stored as .wav files using the included SLM Utility-G4 software or the DNA advanced post processing and reporting tool. Typical Model 831 Sound Level Meter Ranges (when using a microphone with 50 mV/Pa sensitivity) Instrument Gain 0 dB Range 20 dB High Low High Low Peak Overload Level 143 dB 110 dB 123 dB 90 dB Lower Level of A/D Range 50 dB 17 dB 30 dB -7 dB Instrument Noise Floor 23 dB 23 dB 21 dB 21 dB Sound Recording Range 50 - 143 dB 23 - 110 dB 30 - 123 dB 21 - 90 dB Fig. 23 Fig. 24 A recording icon will appear on the Model 831 display when recordings are being made. Event Indication Display on the Model 831 Larson Davis | Toll-Free in USA 888.258.3222 | Phone: 716.926.8243 | www.larsondavis.com Reverberation Time (831-RT) Reverberation times are used in multiple architectural acoustics applications ranging from simple experimental reverberation time determination for room performance, to calculating absorption coefficients for material performance. Most of the time, these measurements are dictated by various international standards. Fig. 25 RT Displays of Decay Curves Model 831 measures the decays and then computes the reverberation time according to ISO 3382-2 or ASTM 2235-04 standards. When using the Interrupted Noise method, the Model 831 not only triggers the data acquisition, but its built-in Noise Generator can be used to drive the omni-directional sound source. Recent trends show that the Integrated Impulse method is gaining popularity and Model 831 handles the acquisition of the decays and the subsequent T20 or T30 calculations completely and with ease. While the use of 1/3 octave bands is the most common method on the Model 831, the user can elect to work either with 1/3 octaves or full octave bands. Helping the user in the field assess his measurement results the Model 831 computes the decay times automatically, shows the T20 and T30 spectra superimposed, computes seven (7) quality indicators per frequency as well as grades the measurement data. All these indicators are immediately available saving considerable time. Easy-to-read screen and keyboard indicators help guide the user through the measurement. For example, a flashing red LED on the Model 831 indicates to the user when they need to create the impulsive noise, for example, with a starter pistol or a balloon. Fig. 26 The resulting data and decays can be exported to the SLM Utility-G4 or can be processed further in DNA for reverberation time, absorption coefficients or sound insulation calculations. Using DNA software, a full array of building acoustic measurements are possible as defined in ISO 10140, 140, 717 and ASTM standards. Quality and Measurement Grade Indicators Larson Davis | Toll-Free in USA 888.258.3222 | Phone: 716.926.8243 | www.larsondavis.com Fig. 27 FFT Max-tracking on Model 831 Fast Fourier Transform Analysis (831-FFT) Fig. 28 DNA Software FFT-spectrogram of Stone-cutting Operation When a frequency resolution greater than 1/3 octave band spectral analysis is needed, the Model 831-FFT frequency analysis is the ideal solution. The Fast Fourier Transform (FFT) algorithm is implemented in the Model 831 for precision spectral analysis of acoustic signals. By utilizing a variety of frequency span and resolution settings, FFT acquisition settings can be adjusted to tune into specific acoustic and vibration phenomena. The Model 831-FFT has three (3) operational modes serving different applications. The “Count” mode accumulates the average spectrum and maximum for a fixed number of FFT spectra. The “Timed” mode repeats the count mode for a given period of time and accumulates the spectra in a history. The “Timed” mode is best suited for transient signals, while the “Manual” mode is typically used for steady state measurements. In Manual mode, the number of averages is open and each Start-Stop sequence adds an entry to the history table. Up to 6400 lines of resolution are available with the Model 831-FFT, allowing for detailed measurement analysis. The FFT option has been further enhanced with the onboard computation of tonality as described in ISO 1996-2 Annex C. Tone level, masking noise level, audibility and quality indicators are all automatically computed and displayed in a simple to use interface that makes object measurement of tones in the field easy. Fig. 29 Model 831 Tonality Calculation Larson Davis | Toll-Free in USA 888.258.3222 | Phone: 716.926.8243 | www.larsondavis.com Data Navigation and Analysis Software (SWW-DNA) Data Navigation and Analysis Software (SWW-DNA) is designed to analyze and report environmental noise, worker exposure and architectural acoustic measurements with an interactive graphical interface. DNA and the Model 831 can be used in two ways: DNA retrieves files from the Model 831 or DNA uses the Model 831 as a data acquisition front-end. Features: n n n Remote access over modem or network Interactive graphs with data: zoom, evaluate processing for events, masking automated placement of speaker icon on time history and running cursor with sound replay on TH linked cursors over several graphs Template based operation with customizable templates A major differentiating concept of DNA is the principle of separation of data and graphical layout. This allows for drag-and-drop functionality of new data in the same layout. With many environmental studies being similar in nature, this feature allows for quick, professional looking reports. Software Solutions The Model 831 has numerous on-board capabilities, yet often further processing, visualization or reporting needs exist. For this purpose the Model 831 can be used as a portable instrument and retrieve the data, work as a data acquisition frontend, or in combination. SLM Utility-G4 The SLM Utility-G4 program is an easy-to-use Windows® software for the Model 831 providing configuration set-up, data download and remote access. The Screengrabber feature emulates the SLM screen on your PC, convenient for presenting data stored on the Model 831 or for teaching classes. Measurement set-ups can be stored on the PC and exchanged with one or more Model 831 sound level meters. Data can be downloaded into a PC and easily exported to Excel® for further analysis. SLM Utility-G4 can simultaneously access multiple 831-based noise monitoring stations via USB, modem or Ethernet, which makes managing multiple noise monitors simple and convenient. Software Development Kit (831-SDK) The Software Development Kit for the Model 831 interfaces smoothly and directly with Microsoft or Linux programming environments supporting Excel®, VBA, Visual C++ or C# programming languages. The SDK provides functionality to establish connection and fully control the Model 831 over USB, network or modem connections. File download is supported and the SDK includes documentation and software for extracting data from files. Because of a reliance upon JSON, the SDK makes it easy to create modern, web based applications with minimal effort. Microsoft, Visual Studio and Excel are registered trademarks of Microsoft Corporation in the United States and/or other countries. Larson Davis | Toll-Free in USA 888.258.3222 | Phone: 716.926.8243 | www.larsondavis.com System-at-a-glance Model CAL200 Calibrator Model CAL250 Calibrator Model ADP021 1 inch – 1/4 inch Calibration Adaptor Model EPS2116 Environmental Shroud Model ADP024 1/2 inch – 1/4 inch Calibration Adaptor Model WS001 Windscreen Microphone 1/4 inch Free Field 1/4 inch Random Incidence 1/4 inch Pressure Model PRM2103-FF Microphone & Preamplifier Model TRP003 Tripod Model ADP074 ICP® Sensor Adaptor Model TRP001 Tripod Model PRM831 Preamplifier Model PRN003 Printer CBL138 CBL203-20 CBL208-20 Model BAS001 Speaker Source AA Alkaline Model SEN031 Weather Station CBL167 & DVX008A AA e-Lithium AA NiMH Tripod CBL182 Model GPS001 GPS Model BAS002 Amplifier CBL180 CBL140 SLM Utility-G4 PC SDK CBL138 CBL143/168 Model EPS036/7 Environmental Case Model PRM2103-FF Microphone & Preamplifier Microphone 1/2 inch Free Field 1/2 inch Random Incidence 1/2 inch Pressure Model ADP043 1/2 inch – 1/4 inch Preamp Adaptor Model BAT011 12V Battery Model EPS2116 Environmental Shroud Model PSA029 AC Adaptor DNA Model 831-INT(-ET) Docking Station Larson Davis | Toll-Free in USA 888.258.3222 | Phone: 716.926.8243 | www.larsondavis.com Model 831 Standards, Features & Specifications Standards Met by Model 831 The Model 831 meets the specifications of the following standards: General Specifications Sound Level Meter Standards Reference level range 114.0 dB re. 20 μPa Reference frequency 1000 Hz Reference direction 0° is perpendicular to the microphone diaphragm Reference level IEC61672-1 Ed. 2.0 (2013-09) Class 1, Group X IEC60651 Ed 1.2 (2001) plus Amendment 1 (1993-02) and Amendment 2 (2000-10) Type 1, Group X IEC60804 (2000-10) Type 1, Group X ANSI S1.4-2014 Type 1 Single large range for SLM Normal for OBA option, Gain 0 dB Temperature ≤ ± 0.5 dB error between +14 to +122 °F (-10 to 50 °C) Octave Filter Standards (Option 831- OB3) Storage temperature -4 to 158 °F (-20 to 70 °C) IEC61260 Ed. 1.0 (1995-08) plus Amendment 1 (2001-09), 1/1 and 1/3 octave bands, Class 1, Group X, all filters Humidity ≤ ± 0.5 dB error from 30% to 90% relative humidity at 104 °F (40 °C) ANSI S1.11-2004 Class 1 Equivalent Microphone Impedance 12 pF for Larson Davis 1/2 in microphone Personal Noise Dosimeter Standards (Option 831-IH) Range Level Error (OBA option) IEC61252 Ed. 1.1 (2002-03) Type 1 Digital Display Update Rate Effect of an Extension Cable ≤ ± 0.1 dB relative to the reference range Four times per second (0.25 sec between updates). First display indication is available 0.25 seconds after initiation of a measurement. None (up to 200 ft or 61 m with EXCxxx cable) Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use Electrostatic Discharges The instrument is not adversely affected by electrostatic discharges 2006/95/EC Low Voltage Safety Directive Extended Weather Options -40 to +158 ºF (-40 to +70 ºC) operation with CER-831-E IEC 61010-1 Ed. 3.0 (2010-06) Resolution Specifications EMC Immunity and Emission Levels 0.1 dB 2004/08/EC EMC Directive Dose 0.1% IEC 61326-1 Ed. 2.0 (2012-07) Elapsed time 0.1 second IEC 61672-1 Ed. 2.0 (2013-09) Real time clock 1 second FCC Title 47 CRF Part 15, Class B Calendar Through 31 Dec 2100 Model 831 General Features and Characteristics Integration Time Class 1 Precision Integrating Sound Level Meter with real-time 1/1 and 1/3 octave filters Time Averaged Levels and Sound Exposure Levels (s) Non-Volatile Memory Minimum 0.1 second High contrast 1/8th VGA LCD display with white LED backlight; sunlight readable Maximum with Daily Autostore Enabled Unlimited Icon-driven graphic user interface Maximum with Daily Autostore Disabled > 23 days with error < 0.5 dB Soft rubber backlit keys Dosimeter Metrics: TWA, Dose (s) Large dynamic range Minimum 0.1 second Time weightings: Slow, Fast, Impulse, Integration and Peak simultaneously (AnyData) Maximum Unlimited Frequency weightings: A, C, Z simultaneously (AnyData) Ln Statistics 1/1 and 1/3 octave frequency analysis available Number of selectable parameters 6 in xx.xx% format, visible on the Model 831 Voice message annotation and sound recording Storage of Complete Table 0.1 dB Steps Ln statistics (L0.01 through L99.9 available) Spectral Statistics Requires Octave Analysis option (831-OB3) SLM Utility-G3 software available for set-up, control and high speed data download with export to Excel® Markers Multi-tasking processor allows measuring while viewing data or transferring data Number of Markers 10 Data Secure feature saves data to permanent memory every minute Prenamed Markers 5: Truck, Automobile, Motorcycle, Aircraft, Exclude AC/DC outputs to recorder Link Marker to Automatic Sound Recording Yes, requires Sound Recording option (831-SR) Long battery life; > 16 hours continuous measurement Back Erase ANSI S1.25-1991 Class 1 Multiple language support: English, German, Italian, Spanish, Portuguese, Swedish, French & Turkish Field-upgradable firmware: keeps instrument current with the latest measurement features Two-year limited warranty Back Ease Time 5 or 10 seconds Supported Modes Manual Measurement Control Modes Sound Level Meter Specifications Averaging (Integration method) Linear or Exponential Available Modes RMS Time Weighting Slow, Fast or Impulse Timed Stop Frequency Weightings A, C or Z Stop When Stable Peak Detector Frequency Weighting A, C or Z Gain 0 dB or +20 dB Exchange Rates 3, 4, 5, or 6 dB with optional 831-IH Sample Rate 51,200 Hz Peak Rise Time 30 µs Manual Stop, Timed Stop, Stop when Stable, Continuous, Single Block Timer, Daily Block Timer Time in hh:mm:ss Continuous Restart on Power Failure Delta level in xx.x dB and time in hh:mm:ss 1, 2, 4, 6, 12, 24, 48, 96 or 144 files per day, automated file numbering "yymmddnn.LD0" Automatic if powered by 12VDC Single Block Timer Start date and time to End data and time Daily Block Timer Up to 3 blocks with each start and end date, blocks can cross date line Continuous with Daily Auto-Store Clock Stability Physical Characteristics < 1 sec in 24 hours, at 75 ºF (+24 ºC) Length with Microphone and Preamplifier 11.35 in 29.0 cm Length, Instrument Body Only 8.8 in 22.4 cm Width 2.8 in 7.1 cm Digital Voice Annotation Depth 1.6 in 4.1 cm Annotate Recordings Use headset (ACC003) or measurement microphone Weight with Batteries, No Preamplifer or Microphone 13.6 oz 390 g Recording Sample Rate 8 ksps Weight with Batteries, Preamplifer and Microphone 1.2 lb 550 g Listening Options On the Model 831 or using processing software for .wav files < 10 sec in 30 days, at -40 to +158 ºF (-40 to +70 ºC) Excel is a registered trademark of Microsoft Corporation in the United States and/or other countries. Larson Davis | Toll-Free in USA 888.258.3222 | Phone: 716.926.8243 | www.larsondavis.com AC/DC Output, Power Supply, Memory Retention, Broadband Noise Level & Preamplifiers PRM831 Preamplifier Model 831 Preamplifier Specification (PRM831) Frequency response with respect to the response at 1 kHz with 1 Vrms input and 12 pF equivalent microphone. 377B02 Microphone 8 Hz to 16 Hz +0.1, -0.2 dB 16 Hz to 100 kHz +0.1, -0.1 dB Lower -3 dB limit < 1.5 Hz Attenuation 0.1 dB (typical) Input Impedance 10 G Ω / 0.16 pF Output Impedance 50 Ω Maximum Output 28 Vpp 143 dB peak for microphones with 50 mV/Pa sensitivity Maximum Output Current 12 mA peak Harmonic Distortion < -70 dBC with 8 Vrms output at 1 kHz Output Slew Rate General Specifications (Continued) Power Supply Voltage AC/DC Output Jack 2.5 mm (3/32 in), see CBL139 cable AC Output Voltage Range ± 2.3 Vpeak maximum output, 0.5 mV to 1.6 Vrms sine AC Output Recommended Load Headset with ≥ 16 Ω speaker impedance DC Output Voltage Scale 10 mV per dB, 0 V for 0 dB, 1 V for 100 dB DC Output Frequency & Time Weighting Follows SLM Settings: A, C or Z and S, F or I Tee-off Preamplifier Signal Alternative 2 V per μs (typical) Electronic Noise With 12 pF Equiva- 1.8 µV typical A-weighted (2.4 µV max) lent Microphone 4.3 µV typical Flat 20 Hz to 20 kHz (5.0 µV max) Use ADP015 and EXC006 DC Output Level 15 to 36 V ~1/2 power supply voltage Power Supply Current 1.9 mA (typical) Temperature Sensitivity < ±0.05 dB from +14 to +176 °F (-40 to +80 °C) Humidity Sensitivity < ±0.05 dB from 0 to 90% RH, non-condensing at +122 °F (+50 °C) Dimensions (D x L) 0.50 x 2.88 in (12.7 x 73 mm) Microphone Thread 11.7 mm - 60 UNS (0.4606 in - 60 UNS) Cable Driving Capability Power Supply The Model 831 SLM (10 Vrms output signal) to 20 kHz with 200 ft (61 m) cable Batteries 4-AA (LR6) NiMH, 1.5 V Lithium or Alkaline cells (supplied with 2500 mAh NiMH) Output Connector All values are at 73 °F (23 °C), 50% RH, 35 V supply, 10 ft (3 m) cable and equivalent microphone of 12 pF unless otherwise stated Switchcraft TA5M (5-pin male) Compatibility (to IEC61094-4) Use with 1/2 in microphone, typical 50 mV/Pa sensitivity External Power (5 V from USB) USB Mini-B connector to * USB interface from computer * PSA029 AC to DC power adaptor * USB Hub * PSA031 12 VDC to USB adaptor Model 831 with PRM831 and 377B02 Microphone Operating Time on 1.5 V Lithium Power through I/O connector: 10 to 15.5 VDC Use cable CBL140, CBL154 or Model 831-INT Interface Unit > 24 hours with power save options, 1 sec Leq logging Power Consumption with PRM831 1.1 W (backlight off, running) External Power Test Conditions Dynamic Range Memory Retention Data Memory Non-volatile flash memory, backup performed every minute Real-time Clock ≥ 10 minutes with batteries removed Measurement Range  Broadband Noise Levels Self-generated Electrical Noise 0 dB Gain 20 dB Gain A 18 - 140 dB 17 - 120 dB C 18 - 140 dB 17 - 120 dB Z 23 - 140 dB 21 - 120 dB A 28 - 140 dB 26 - 120 dB C 29 - 140 dB 27 - 120 dB Z A 35 - 140 dB ≥ 115 dB 24 to 140 dB ≥ 114 dB 25 to 140 dB ≥ 106 dB 32 to 140 dB 66 - 143 dB 34 - 120 dB ≥ 101 dB 19 to 120 dB ≥ 96 dB 23 to 120 dB ≥ 86 dB 32 to 120 dB 46 - 123 dB C 66 - 143 dB 46 - 123 dB Z 77 - 143 dB 59 - 123 dB SPL 140 dB 120 dB PEAK 143 dB 123 dB A 0 dB Gain Weighting 20 dB Gain Typical (dB) Max (dB) Typical (dB) Max (dB) A 13 15 6 10 C 15 22 12 16 Z 22 25 19 26 Linearity Range  Z Peak Range Self-generated Total Noise 0 dB Gain Weighting 20 dB Gain Typical (dB) Max (dB) Typical (dB) Max (dB) A 18 19 17 17 C 18 23 17 19 Z 23 26 21 26 Note: Combination of the electronic noise and the thermal noise of the 377B02 microphone at 68 °F (20 °C) measured in a sealed cavity and vibration isolated with an averaging time of 60 seconds.Electronic noise of the instrument with an ADP090 (12 pF) in place of the microphone highest anticipated self-generated noise. C Max Level Notes  As defined in IEC 61672-1. Microphone and electrical self-noise included.  As defined in ANSI S1.4-1983. Electrical Measurements. Permanent Outdoor Preamplifiers and Microphones Model 426A12 Model PRM2103 Larson Davis | Toll-Free in USA 888.258.3222 | Phone: 716.926.8243 | www.larsondavis.com Model 831 Options-at-a-glance Fast Fourier Transform (831-FFT) FFT lines 400, 800, 1600, 3200 or 6400 Frequency Span 100, 200, 500, 1000, 2000, 5000, 10000 or 20000 Hz Window Hanning, Flattop or Rectangular Frequency Weighting A, C, Z Bandwidth, Z Weighting 3 Hz to 20 kHz Cursors Manual and Max Tracking with or without Harmonic cursors Reverberation Time (831-RT) Methods Impulse Excitation and Interrupted Noise Filters 1/1 (63 Hz to 8 kHz) and 1/3 (50 Hz to 10 kHz) Sample Time 2.5, 5, 10 or 20 ms Measurements T20, T30 and ISO 3382-2 quality indicators Spectral Analysis with Octave Bands Octave Analysis (Option OB3) Frequency Range 1/1 Octave Filters 8 Hz to 16 kHz 1/3 Octave Filters 6.3 Hz to 20 kHz Octave filter self generation noise at 1 kHz 1/1 Octave Filters 2.0 dB @ low range (0.2 dB in low range w/ 20 dB gain) 1/3 Octave Filters -3.1 dB @ low range (-4.9 dB in low range w/ 20 dB gain) Octave Analysis Parameters Filters Dosimetry (831-IH) None, 1/1 octave, 1/3 octave, or 1/1 and 1/3 octaves Frequency Weighting (independent A, C or Z of broadband) Maximum Spectrum Maximum in each band or Spectrum at broadband Lmax Spectral Statistics 6 percentiles per band Time History (see 831-LOG) Measurement History (see 831-ELA) Event History (see 831-ELA) Octave Band Logging Capability BAS003 Directional Speaker Normalized Spectrum Dosimeters Two in parallel Pre-configured settings OSHA-1, OSHA-2, ACGIH, NIOSH, IEC Exchange Rate 3, 4, 5, or 6 dB (independently selectable per dosimeter) Threshold Selectable level Criterion Duration and Time Numeric input Communication Analog modem and Serial Communication View Modes SPL, Leq, Lmax or Lmin; absolute or relative Predefined Filters A, C, -A, -C User Defined Filters Four named for 1/1 octave and four for 1/3 octaves bands Profiling with Time History Logging, Measurement History and Event History Time History "TH" Logging (831-LOG) Analog Modem Protocol Requires fax quality line (no VOIP-like data compression allowed) and an analog modem on host computer Z-Modem Analog Modem Model MDMUSB-A Analog Modem Support Analog Modem Power Requirement Powered USB Hub or 831-INT Docking Station Analog Modem Control Model 831 USB port as host controller Analog Modem Data Rate 2 to 3 kB/s (typical) Serial Communication Prerequisite USB to serial bridge (DVX008A) Serial Communication Protocol Z-Modem Measurement History "MH" Logging (831-ELA) Serial Communication Control Model 831 USB port as host controller Interval 1 min to 99 hr Wireless Modem (831-COMM) Over Internet Logging Parameters Same as Overall Measurements Ln Statistics + Spectral Ln (if OB1 or OB3 enabled) Wireless Modem Support Sound Record Tagging At start of each interval (required to enable SR) Record Period Logging Parameters Selections from 20 ms to 24 h 2.5, 5 and 10 ms are available with option 831-FST Any combination of available broadband and spectral AnyData plus non sound metrics Event History "EH" Logging (831-ELA) Logging Period Sound Record Tagging 20 ms to 5 s (independent of TH or MH) Leq, Lmax, Lpeak, Date and Time, Duration, Exposure in dB and Pa2s, and available spectral Leq and maximum. Event time history is also available with broadband and spectral levels. Required to enable SR at 8 or 16 ksps SEL Yes (LAE) Logging Parameters Sound Recording (831-SR) Wireless Modem Protocol GSM-GPRS Edge technology over internet Dynamic IP address support via server initiated call Static IP address support when allowed by ISP provider (does not require modem on server) Z-Modem over TCP/IP Wireless Modem Model MDMUSB-E (Quad-band) Wireless Modem Power Requirement Powered USB Hub or 831-INT Docking Station Wireless Modem Control Model 831 USB port as host controller Wireless Modem Data Rate 2 to 3 kB/s (typical) USB Communication Standard Cables Up to 16.4 ft (5 m), CBL138 is 6 ft (1.8 m) Extended Cable Devices are available that extend the connection up to 330 ft (100 m) Data Format Mono wave file (.wav), lossless Weather (Meteorological Parameters) Listening Options On Model 831 using headset with Utility program, DNA or using standard wave file player Combined Meteorological Unit (SEN031) Sample Rate 8, 16, 24 or 48 ksps Storage Requirement 1 MB/min at 8 ksps to 6 MB/min at 48 ksps Sound Recording Modes Manual, Coupled to Marker, at measurement interval begin, upon exceedance event Pretrigger Up to 9 s Duration Max 9999 s Sound Streaming Streaming to host requires USB communication line (831 V1.6 or later) Measurement Method Digitized over serial port to USB Sensor Model SEN031 (requires CBL167, DVX008A and 831-WTHR) Model 831-INT Docking station, or direct to Model 831 (external power source required) CBL170 break-out cable can be used with user provided anemometers and analog sensors Connectivity Measured Parameters Larson Davis | Toll-Free in USA 888.258.3222 | Phone: 716.926.8243 | www.larsondavis.com Wind speed and direction, temperature, relative humidity, rain and hail Ordering Information Model Number Model Number Description 831 831-FF 831-RI Model 831 Sound Level Meter for Environmental / Community Noise including AnyData and Voice Annotation, without microphone or preamplifier Model 831 Sound Level Meter with Class-1 free-field, pre-polarized precision condenser microphone (50 mV/pa), preamplifier (PRM831), accessory kit (831-ACC) Model 831 Sound Level Meter with Class-1 random-incidence pre-polarized condenser microphone (50 mV/Pa), preamplifier (PRM831), accessory kit (831-ACC) 831-ELA 831-OB3 831-SR 831-FST 831-IH 831-COMM 831-RT 831-FFT 831-MSR Upgrade Model 831 Sound Level Meter with logging of time histories with periods from 20 ms to 24 hr Upgrade for Model 831 Sound Level Meter. Exceedance based logging analysis with event, interval and daily histories. Upgrade Model 831 Sound Level Meter with Real-time 1/1 & 1/3 octave filter set Upgrade Model 831 Sound Level Meter with sound recording. Adds sound snapshot on demand, with Measurement History (831-ELA required) or on events. Upgrade Model 831 Sound Level Meter to logging of time histories with periods from 2.5 ms to 24 hr (requires 831-LOG & 831-OB3) Upgrade Model 831 Sound Level Meter, Industrial Hygiene feature Upgrade Model 831 Sound Level Meter, Advanced Communication Option controls the EDGE modem (MDMUSB-E) Upgrade Model 831 Sound Level Meter with Reverberation Time Analysis Upgrade Model 831 Sound Level Meter with FFT Analysis Upgrade Model 831 Sound Level Meter with Measurement History and Sound Recording 831-ACC 831-CCS ACC003 ADP074 CBL138 CBL139 CCS032 PSA027 PSA029 PSA031 CBL140 3 1/2 inch diameter windscreen for 1/2 inch microphone Accessory kit for Model 831 Sound Level Meter, which includes case (831-CCS), battery (4-AA), power supply w/ USB cable (PSA029) and windscreen (WS001) Hard shell case for Model 831 Sound Level Meter Headset with microphone boom, 0.09 inch (2.5 mm) sub-miniature plug ICP® cable adaptor for Model 831 Sound Level Meter Cable USB A to Mini-B 6 ft (1.8 m) Cable 0.09 inch (2.5 mm) sub-miniature plug AC/DC out to BNC or RCA Soft pouch for Model 831 and SoundTrack LxT® 90 to 264V to 12V switching power supply for 824 and 831 sound level meter and HVM100 AC Power supply for Model 831 and SoundTrack LxT® (100-240 VAC to 5 V USB w/mini-B cable, CBL138) 12 VDC to USB Converter for SoundTrack LxT® and Model 831 DC power cable for Model 831 Sound Level Meter, 8 – 30 VDC includes lead-acid battery clamps and 12 V car plug Microphones and Preamplifiers PRM831 377B02 377C20 377C10 ADP043 426A12 PRM2103 SWW-DNA SWW-DNA-831 SWW-DNA-BA SWW-DNAREMOTE Model 831 Sound Level Meter preamplifier for 1/2 in free-field or random incidence prepolarized microphones 1/2 inch free-field, prepolarized condenser microphone, typical sensitivity = 50 mV/Pa, 3.15 Hz to 20 kHz (±2 dB) 1/2 inch random incidence, prepolarized condenser microphone 50 mV/Pa, 3.15 Hz to 16 kHz (±2 dB) 1/4 inch pressure, prepolarized condenser microphone typical sensitivity = 1.6 mV/Pa, 4 Hz to 70 kHz (±2 dB) 1/4 inch microphone to 1/2 inch preamplifier adaptor Permanent outdoor preamplifier with electrostatic actuator, humidity reading, TEDS and supporting externally and pre-polarized microphone (microphone not included) Permanent Outdoor Preamplifier for Model 831 with Remote Calibration Check, humidity reading and heater, for pre-polarized microphone (MIC and cables not included) SLM Utility-G4 software for SoundTrack LxT® and Model 831 sound level meter: download, upgrade, translate, print text reports or export to spreadsheet. CD with Quick Start Guide Basic software and dongle (USB) for evaluation and reporting of data downloaded from the Larson Davis instruments, requires an instrument driver Instrument driver for instrument control, set-up, live display, data translation, and data download for Model 831 Sound Level Meter DNA option for events tracking: PNL and PNLT event time history and EPNL event DNA software Building Acoustics, allows calculation of transmission loss and sound insulation calculations DNA software for monitoring a remote location when using 820, 824, 870, or 831 Models. Uses modem connection for communication and data download. Calibrators CAL200 CAL250 Class 1 acoustic calibrator with user selectable output of 94 or 114 dB at 1 kHz. 1/2 inch opening (no adaptor) Class 1 microphone calibrator, output 114 dB at 251.2 Hz. 1 inch opening with 1/2 inch (ADP019) adaptor. 3/8 inch (ADP020) and 1/4 inch (ADP021) adaptors available Temporary Noise Monitoring System Components EPS029-831 EPS030-831 EPS2116 Handheld Accessories WS001 SWW-SLMUTILG4 SWW-DNA-EV Sound Level Meter Options 831-LOG Description Software Sound Level Meter TRP001 TRP003 ADP034 CBL174 Case for Model 831 including (2) 21Ah bat, charger (PSA032), internal preamplifier cable (CBL141), preamplifier cable (CBL142-006), power cable (CBL143), 3 ft mast Case for Model 831 Sound Level Meter including (1) 21Ah battery, charger (PSA032), internal preamplifier cable (CBL141), and power distribution cable (CBL151) Environmental protection for 1/2 inch preamplifiers with windscreen, bird spikes, desiccants and universal mounting Instrumentation tripod w/ADP032 preamplifier to tripod interface Support tripod, maximum height 8 ft (2.4 m) used in portable NMS systems Adaptor connecting EPS2116 to TRP003 tripod Waterproof cable connecting EPS029-831/EPS030-831 to external PC, 2m USB A-to-B Permanent Noise Monitoring Systems NMS016 NMS019 NMS021 NMS022 Permanent NMS on tilt-down pole using main power. Includes 831 (LOG, ELA), 831-INT, TRP019, 426A12-FF, EPS031 (w/ 9Ah battery) and cables. Portable NMS on tripod using solar power. Includes 831 (LOG, ELA), 831-INT, TRP020-20, 426A12-FF, EPS032 (w/ solar charger) and cables (required PSA012 and battery) . NoiseTutor complete system including 831-FF with 831-OB3, 831-ELA and 831-LOG firmware options and EPS2116. Also includes EPS041 that consists of weathertight case, 80 Wh battery, embedded PC, HDMI display, wireless keypad, SWW-DNA-NT software, and wireless gateway. NoiseTutor complete system including 831 with 831-OB3, 831-ELA and 831-LOG firmware options, PRM2103-FF and EPS2116. Also includes EPS041 that consists of weathertight case, 80 Wh battery, embedded PC, HDMI display, wireless keypad, SWW-DNA-NT software, and wireless gateway. Noise Monitoring System Components 831-INT 831-INT-ET ACC004 CBL170 EPS037 MDMUSB-A MDMUSB-E DVX008A SEN031 Model 831 docking station connecting weather sensors, batteries, charger and USB peripherals Model 831 Docking Station with Ethernet (RJ45) connecting to power supply, weather sensors, batteries, charger and USB peripherals Surge suppressor for 110-240 VAC Cable connecting Model 831 to 9-pin D connector (wind speed, direction, logic I/O, 3 slow ADC) and coaxial DC connector (to PSA027), including breakout cable and I/F block Case on wheels (CCS035) with 100 Ah battery (BAT002) for permanent NMS, includes cable (CBL149) to enclosure (EPS031 or EPS032) Modem for Model 831 sound level meter with USB connection and dial-up EDGE Modem for Model 831 Sound Level Meter with USB connection USB Adaptor to DB9 interface (used with Serial modem or SEN031) Combined weather sensor: wind speed and direction (no moving parts), temperature, humidity, pressure, rainfall (requires CBL167 cable + DVX008A) Calibration CER-831 CER-MIC CER-831-E Noise Sources & Accessories CER-PRM2103-E CER-426A12 831-RPT CAL200 1 kHz, 94 and 114 dB, Calibrator BAS001 Omnidirectional Speaker Calibration and certification of 831(SLM, preamplifier w/o microphone) and 831-RPT Calibration and certification for microphone Environmental certification Model 831 for [-40,+158] °F ([-40,+70] °C) range. Includes calibration of 831 and PRM831, 831-RPT, environmental test of microphone. Microphone calibration not included. Environmental Certification Model PRM2103 for [-40,+158] °F ([-40,+70] °C) range; (no microphone certification); environmental test of microphone Calibration and certification for 426A12 including environmental testing for temperature and humidity stability. Replaces windscreen, o-ring, and desiccant cartridges. Model 831 Sound Level Meter certification test report. Certificate for SLM, preamplifier and microphone. BAS002 Lightweight Power Amplifier Larson Davis | Toll-Free in USA 888.258.3222 | Phone: 716.926.8243 | www.larsondavis.com Larson Davis provides complete solutions for noise and vibration measurement and analysis. From stand-alone, simple-to-use instruments to complete systems including sensors, data acquisition, and software, Larson Davis has what you need. As a division of PCB Piezotronics, Inc., Larson Davis guarantees Total Customer Satisfaction through our outstanding limited warranty; no-charge, 24 hours toll-free technical support; global distribution; and worldwide customer service. 24350 Indoplex Circle, Farmington Hills, MI 48335 USA Phone 716-926-8243 | Toll-Free in USA 888-258-3222 Fax 716-926-8215 | Email email@example.com Website www.larsondavis.com ISO 9001 CERTIFIED LD-831-0515 © 2012-2014 PCB Group, Inc. In the interest of constant product improvement, specifications are subject to change without notice. PCB, and ICP are registered trademarks of PCB Group Inc., SoundTrack LXT, Spark and Blaze are registered trademarks of PCB Piezotronics, Inc. HV Manager is a trademark of PCB Piezotronics, Inc. All other trademarks are properties of their respective owners. Printed in U.S.A.
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