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16-4

Statistical Metrics Measured 

LxT Manual

In Table 16-2: "Sound Exposure Metrics Measured" the
symbol X is used to represent the user-selected RMS and
Impulse frequency weighting (A, C or Z) and the symbol Y
is used to represent the user-selected peak frequency
weighting (A, C or Z). 

The symbol V is used to represent the user selected time
weighting (F, S or I).

Statistical Metrics Measured

.

Six Ln statistical parameters are measured using the
frequency weighting (A, C or Z) and exponential averaging
(Slow or Fast) selected when setting up the LxT for a sound
level measurement. These six values are user-selected over
the range L

0.01

 to L

99.99

.

Community Noise Parameters

When the optional firmware LXT-ENV is enabled, the
community noise parameters L

DN

 and L

DEN

 are measured

and displayed.

Metric

Symbol

Sound Exposure Level, SEL

L

XVE

Average Sound Level, Lavg

L

Xavg

Time Weighted Average Level, TWA(x)

TWA

(8)

Noise Dose

DOSE

Projected Noise Dose

ProjDose

Daily Personal Noise Exposure, Lep,d

LXep,8

Sound Exposure, E

E

XV

Projected 8 Hour Sound Exposure

E

XV8

Projected 40 Hour Sound Exposure

E

XV40

SEA

SEA

Table 16-2:Sound Exposure Metrics Measured

Содержание SoundTrack LxT

Страница 1: ...LxT Manual for SoundTrack LxT SoundExpert LxT TM...

Страница 2: ...I770 01 Rev K Supporting Firmware Version 2 301 Larson Davis LxT Manual for SoundTrack LxT SoundExpert LxT...

Страница 3: ...ithout notice and should not be construed as a commitment or representation by PCB Piezotronics Inc This publication may contain inaccuracies or typographical errors PCB Piezotronics Inc will periodic...

Страница 4: ...nnecting the Preamplifier to the LxT 3 3 Disconnecting the Preamplifier from the LxT 3 4 Powering the SoundTrack LxT 3 4 Chapter 4 Basic Measurement Setup 4 1 Measurement Settings Tabs 4 1 Chapter 5 D...

Страница 5: ...story Setup 9 3 Time History Tab 9 5 Link to Measurement History Display 9 8 Markers 9 9 Chapter 10 Measurement History 10 1 Enabling Measurement History 10 1 Continuous and Timer Modes 10 2 Timed Sto...

Страница 6: ...Chapter 16 Parameters Measured 16 1 Basic Sound Level Measurements 16 1 Sound Exposure Metrics Measured 16 3 Statistical Metrics Measured 16 4 Community Noise Parameters 16 4 Exceedance Counters 16 5...

Страница 7: ...1 3 Octave Filters A 16 Position of Instrument and Operator A 19 Frequency Response A 20 Microphone Preamplifier Specifications A 43 Vibration Sensitivity A 59 Appendix B Testing to IEC61672 1 1 Secti...

Страница 8: ...backlight and icon driven user interface Silent Touch elastomeric keypad Large dynamic range Jack for AC DC output or headset ACC003 Preamplifier can drive a 61 m 200 ft microphone extension cable EX...

Страница 9: ...and list of calibrators Power management Status bar and About display Multiple language support Data files and Data Explorer Automatic data backup to prevent data loss on power failure Overall measure...

Страница 10: ...LG4 SLM Utility G4 software SWW SLM UTILG3 SLM Utility G3 software WS001 Windscreen 3 1 2 in diameter Alkaline Batteries 4 AA Lanyard Optional Accessories Equivalent Electrical Impedance Adaptor An eq...

Страница 11: ...T holding 4 or 8 D sized alkaline 1 5 volt batteries to extend run time Software SWW BLAZE LXT Blaze SWW DNA DNA Accessory Kits LXT ACC including LXT CCS Hard Shell Case CAL200 Class I Calibrator PSA0...

Страница 12: ...ent Camera Tripod with ADP032 1 2 in microphone clip Use with EPS2108 2 TRP002 Microphone Stand with adjustable height and boom angle TRP003 Support Tripod heavy duty can be used with EPS030 or EPS210...

Страница 13: ...story Environmental Data Logging LXT CN Community Noise LXT OB3 Real time 1 1 1 3 Octave Band Analysis Standard Accessories The SoundExpert LxT is delivered with the standard accessories described bel...

Страница 14: ...put Cable or Adaptor EXCXXX Microphone extension cable where XXX is the length in feet XXX 010 020 050 066 100 and 200 available CBL139 AC DC Output Cable Power Supplies PSA031 12 Volt DC to USB Power...

Страница 15: ...LXT Environmental Case with one lead acid battery to be used with an external microphone tripod the tripod is not included Tripods TRP001 Instrument Camera Tripod with ADP032 1 2 inch microphone clip...

Страница 16: ...iew of the SoundTrack LxT sound level meter including the following sections LxT Components Summary of Displays and Icons Navigating and Selecting Basic Run Functions Tab and Setting Displays LxT Comp...

Страница 17: ...rn the LxT OFF This may cause data to be lost Press the 0 ON OFF key then the Off soft key to turn the LxT off Hardware Power Switch When set to O the hardware power switch completely powers down the...

Страница 18: ...has a 160 x 240 graphic liquid crystal display that is backlit to provide comfortable viewing in most ambient light situations Controls are provided for contrast and backlight adjustments When the LxT...

Страница 19: ...ove each Softkey on the bottom of the display is an icon or label indicating the action that takes place when the key is pressed Softkeys are so named because the action associated with the key can ch...

Страница 20: ...se the Enter button to select data options or displays or to enter alphanu meric characters into data fields Use the Run Pause button to initiate and pause measurements and to continue paused measurem...

Страница 21: ...wing The position indicator in FIGURE 2 3 shows that the first page on the Live tab is being viewed Power Indicator The icon indicates whether the LxT is being powered by batteries battery level is al...

Страница 22: ...ars As long as the under range condition exists the icon flashes When the measured level no longer produces an under range condition the icon is removed from the display When a measured level is in an...

Страница 23: ...urement has been stored Navigating and Selecting To navigate between tabs on the display press the right or left Softkeys To navigate within tabs use the 4 and 6 keys for moving horizontally on screen...

Страница 24: ...The 7 STOP STORE key ends a run Pressing the key a second time stores the data in a file This key is only active on a Data View screen Tab and Setting Displays The LxT features and functions are organ...

Страница 25: ...Data View tabs To exit from the Power Control Page press the Center Softkey labeled Close Data Display Tabs For a more detailed description of the Data Display tabs and their associated pages see Cha...

Страница 26: ...g them within view The Measurement Settings tabs allow for specific settings and include the following General used to create a file name and a measurement description For a more detailed description...

Страница 27: ...ng Control Panel Tools Properties The Control Panel uses icons to represent the different functions available Pressing the 3 TOOLS key displays the Control Panel icons The position indicator on the sc...

Страница 28: ...controls that affect power consumption Preferences Set a variety of system parameters such as microphone correction auto store jack function reset prompting takt maximal and USB port Localization Set...

Страница 29: ...provide the user with information specific to this instrument such as serial number options etc The About tabs include the following About shows information such as serial number and firmware revision...

Страница 30: ...ify that the package contains the items listed below Report any damage or shortage immediately to PCB Piezotronics Inc at 888 258 3222 U S toll free or 716 926 8243 LxT PRMLxT Microphone Preamplifier...

Страница 31: ...any future communications with PCB Piezotronics Inc Connecting the Microphone and Preamplifier Caution Take care when handling the preamplifier as the gold pin is sensitive to electrostatic discharge...

Страница 32: ...the LxT and rotate the preamplifier until the keyways line up Press the assemblies together until a small click is heard Caution Do not attempt to unscrew the collar ring at the top of the LxT body If...

Страница 33: ...ophone preamplifier assembly out of the LxT as shown in Figure 3 4 FIGURE 3 4 Preamplifier Release Button Powering the SoundTrack LxT The following sections provide power information for the LxT inclu...

Страница 34: ...Approval Battery Status Battery voltage and estimated run time are displayed on the Power Control page and the last page of the Live tab When the LxT is powered by batteries one of the icons shown in...

Страница 35: ...batteries or if available from the USB host portion of your computer The LxT cannot be operated under USB power if the internal batteries are discharged flat You can run solely on USB power if you re...

Страница 36: ...esult in instrument malfunction The PSA029 is designed to work on power systems worldwide The LxT must run on batteries until allowed by the host to run on external power If the batteries cannot provi...

Страница 37: ...ich are adjusted using the 4 and 6 keys The Display Contrast has a range of 9 to 9 which is adjusted using the 8 and 2 keys The bottom of the Power Control page displays the LxT temperature that is us...

Страница 38: ...selected values of the parameter n Count of the number of times the levels RMS and Peak exceeded user selected threshold values Sound exposure and sound exposure level data The LxT can measure many a...

Страница 39: ...ttempt is made to access the Measurement Settings Screen the display shown in FIGURE 4 1 Settings In Use By PC Message appears FIGURE 4 1 Settings In Use By PC Message This message indicates that setu...

Страница 40: ...r both the file name and the measurement description The General Tab is used to enter file names and measurement descriptions for the measurements being defined Upon opening the Default File Name LxT_...

Страница 41: ...are selected separately Integration Method Two Integration methods are available Linear and Exponential Exponential Integration Exponential integration would typically be selected to provide compatib...

Страница 42: ...e optional LxT OB1 or LxT OB3 firmware enabled FIGURE 4 4 OBA Tab OBA Parameter Selection The OBA parameters are selected as shown in FIGURE 4 5 FIGURE 4 5 OBA Parameter Selection OBA Range Setting In...

Страница 43: ...trum At Lmax using this method the maximum values for each frequency band are those that are being measured at the instant the overall sound pressure level reached its maximum value during the measure...

Страница 44: ...s In most cases measurements of this type are setup to conform to specific standards The LxT permits the user to create such setups in a single step by simply selecting the applicable standard The sta...

Страница 45: ...re modified the user should consider changing the name of the setup The Name field is optional although many users enter text associated with the measurement to be performed such as specific company D...

Страница 46: ...t time For example a value of L90 35 dB means that the measured sound level is above 35 dB for 90 of the measurement period These statistical values are commonly used to describe the characteristics o...

Страница 47: ...op The measurement is initiated manually by pressing the 9 key and is stopped automatically after a user defined time period Stop When Stable The measurement is initiated manually by pressing the 9 ke...

Страница 48: ...nu Navigate to select the desired mode and press 5 to make the selection The screen then appears as one of those shown in Figure 4 11 depending upon the mode selected For the Timed Stop and Stop When...

Страница 49: ...13 FIGURE 4 13 Stop When Stable Run Mode Delta Level The Delta level is the maximum one minute change in overall average level i e LAeq allowed for the measurement to be considered stable Time The Ti...

Страница 50: ...at Daily Auto Store can also be enabled in which case daily measurement reports for 24 hour time periods are automatically stored The user specifies a beginning time for such periods This also presume...

Страница 51: ...ess the 5 again For the Continuous mode when the Auto Store checking the box in the Daily tab results in the following daily measurement reports for 24 hour time periods are automatically stored begin...

Страница 52: ...e parameters are as shown in FIGURE 4 16 FIGURE 4 16 shows the Triggers tab FIGURE 4 16 Triggers Tab The Triggers tab is used to define trigger levels that can than be used to detect when the measured...

Страница 53: ...ening night level LDEN is defined by the following formula In the default form the day has twelve hours the evening has four hours and the night has eight hours as can be seen in the equation The defa...

Страница 54: ...wo hours and lengthen the day and or the night accordingly and also to choose the time for the start of the day To accommodate these and other possible modifications the Day Night tab permits the user...

Страница 55: ...4 18 Measurement Settings Tabs LxT Manual...

Страница 56: ...number of tabs arranged horizontally across the screen as shown in Figure 5 1 Depending on the firmware options loaded in the LxT multiple tabs appear in the Data Display each identified by a title a...

Страница 57: ...f some settings within pages of the tabs once the setting is selected In these cases once the desired value is specified press 5 Under Range Condition When a measured level is in an under range condit...

Страница 58: ...d Live Tab This sections describes the pages on the Live tab The Live tab contains the following pages Profile Digital 1 1 Octave optional with separate license 1 3 Octave optional with separate licen...

Страница 59: ...s the Profile page FIGURE 5 4 Live Tab Profile Page The time at the bottom of the page is the date and time that the measurement started Profile of 1 Sec Leq using selected Frequency Weighting from Se...

Страница 60: ...5 5 Live Tab Digital Page In addition to displaying the current value of Leq this page displays check marks to indicate current of the SPL1 trigger level which are user defined as described in page Tr...

Страница 61: ...e right most bar on the graph is the selected broadband SPL value in this instance LAS FIGURE 5 6 Live Tab 1 1 Octave Page The spectrum frequency weighting is selected independently from that of the s...

Страница 62: ...s as shown in Figure 5 7 FIGURE 5 7 Live Page 1 3 Octave Page Triggering For a description of the setup of these trigger values see Triggers Tab The Triggering page displays the sound level and peak l...

Страница 63: ...ble as a percentage and in number of kilobytes The number of stored data files is also indicated Figure 5 9 shows the Power page FIGURE 5 9 Live Tab Power Page Overall Tab This section describes the p...

Страница 64: ...5 11shows the Digital page of the Overall tab Leq using Frequency Weighting and Detector from Setup Sound Level for Currently Selected Weighting and Detector Leq using selected Frequency Weighting and...

Страница 65: ...FIGURE 5 12 Overall Tab Leq Page The LZpeak max is the highest level the peak detector has measured during the run time of the measurement The date and time of occurrence is recorded with this event...

Страница 66: ...The value of Lmax for each frequency band is the maximum value that occurred in that band during the entire measurement period Since individual frequency bands may reach their maximum levels at differ...

Страница 67: ...displays in these pages Figure 5 15 shows the measurement parameters that correspond to the setup named OSHA 1 FIGURE 5 15 Overall Tab Dosimeter 1 2 Pages TWA 8 The value of TWA 8 Time Weighted Averag...

Страница 68: ...ght hours Lep d The Daily Personal Noise Exposure Lep d is calculated from data measured during the run time of the measurement DOSE Dose is based on data measured during the run time calculated for t...

Страница 69: ...this instance for A weighted Slow FIGURE 5 16 Overall Tab SEL Page LASE is the sound exposure level previously known as SEL The Sound Exposure metrics indicate the actual and extrapolated 8 and 40 hou...

Страница 70: ...rovince of Quebec The SEA page is an integration of 1 second peaks that exceeded 120 dB as shown in Figure 5 17 Both the SEA value and the frequency weighting used for the measurement are displayed Se...

Страница 71: ...age displays the Ln statistics for the measurement based on the run time as shown in Figure 5 18 Also shown are the maximum and minimum sound levels measured An Ln is the level that was exceeded n per...

Страница 72: ...ector and three for the peak detector as shown in Figure 5 19 The exceedances count and time shown on this page as well as those exported in data files are computed according to your current weighting...

Страница 73: ...vals associated with the Day Evening and Night periods are set as described in Triggers Tab The Community Noise page displays three equivalent levels calculated for the total measurement time as shown...

Страница 74: ...levels measured using Slow RMS averaging and using frequency weightings of C and A respectively The difference between them LCSeq LASeq is often used as an indicator of the amount of low frequency con...

Страница 75: ...e of measurement made and the memory status as shown in Figure 5 23 FIGURE 5 23 Overall Tab Memory Page Session Log Tab The Session Log is a record of sound measurement actions as shown in Figure 5 24...

Страница 76: ...item is being viewed out of how many total items are in the list View Spectrum Normalized Optional The Live Spectrum continues to change in time following the normalization whereas the Reference spect...

Страница 77: ...pectrum displayed on the Live tab appears as shown in FIGURE 5 25 FIGURE 5 25 Live Spectrum Display To access the View Normalized display press the center softkey Menu to display the menu shown in FIG...

Страница 78: ...erence spectrum 1 If reference spectrum 1 has not been previously defined the display shows the actual live SPL spectrum Selecting the Spectrum Type In the live display it is not necessary to select a...

Страница 79: ...trum By pressing the Set softkey the current spectrum is set as the reference spectrum for the selected reference 1 2 3 or 4 Following this procedure reference spectra 1 2 3 and 4 can be defined Once...

Страница 80: ...ersion of a spectrum FIGURE 5 30 Normalized Spectrum with A Weighting Graph Relative Selecting Graph Relative changes the graph to show the difference between the current data and the reference with t...

Страница 81: ...5 26 View Spectrum Normalized Optional LxT Manual...

Страница 82: ...ound level measurements Observer Position In order to avoid the effect of sound reflections from the body of the operator interfering with the measurement the meter should be located as far as possibl...

Страница 83: ...diameter ball made of open cell foam which can be placed over the microphone and preamplifier as shown in FIGURE 6 1 FIGURE 6 1 Position of Windscreen Performing Measurements This section describes t...

Страница 84: ...second minimum When the overload has been removed the icon remains present not flashing to indicate that an overload has occurred during the measurement A reset clears the icon from the display Under...

Страница 85: ...the LxT is paused Back Erase Back Erase is disabled when Measurement History has been enabled in the LxT setup as described in Chapter 10 Measurement History The back erase function permits the user...

Страница 86: ...shown in FIGURE 6 4 FIGURE 6 4 Ten Second Back Erase Label The Back 10 label does not indicate the state of the instrument but that an action can now be taken to delete the last ten second segment Th...

Страница 87: ...o Indication The user can take one of the following actions Press the 9 key to continue the measurement with the five second segment removed Press the center softkey to implement the Undo action and t...

Страница 88: ...data files A reset can be initiated when the LxT is running paused or stopped However it must be stopped for the reset operation to be performed Starting a New Measurement The 9 key must be pressed to...

Страница 89: ...measurement is stored the file number assigned is the next in sequence following the measurement previously stored Overwriting a Saved File If you wish to use this data to replace a data file already...

Страница 90: ...or Single Block Timer or Daily and Daily Autostore is enabled Normal Operation Under normal operation the stored data files are stored with the following name format yymmdd00 LD0 where yymmdd is the d...

Страница 91: ...er responds by selecting not to store the data the sequence moves to Step 2 Step 2 The user is prompted to reset the instrument If the user responds by selecting to reset the instrument the instrument...

Страница 92: ...torage After Improper Shutdown 6 11 FIGURE 6 9 Improper Shutdown Sequence Case 2 Instrument Reset No Response for 10 seconds No Reset Instrument prompt Yes No No Response for 10 seconds Save Data prom...

Страница 93: ...6 12 Data Storage After Improper Shutdown LxT Manual...

Страница 94: ...of dB re 1V Pa or mV Pa Overload Under Range Conditions A secondary role of calibration is to determine the sound level that would overload the instrument and the minimum sound level that can be accu...

Страница 95: ...he calibration and a published value of sensitivity An on screen window appears to warn the user when the difference between these two values exceed 3 dB Control Panel Calibrate To activate the Calibr...

Страница 96: ...2 FIGURE 7 2 Calibration Tabs Calibrate Tab The Calibrate tab is used when performing an acoustic calibration including the selection of the sound level calibrator to be used and the implementation of...

Страница 97: ...ion Tab The Certification tab shows the date of the last certification the due date for the next certification and information about the calibration facility You can also enter your certification inte...

Страница 98: ...Davis recommends for calibrating the LxT1 and LxT2 When using a 1 4 microphone the adaptor ADP024 a 1 4 microphone adaptor for the 1 2 opening in the CAL150 and CAL200 calibrators is also required Cal...

Страница 99: ...dB kPa If the system is calibrated at 85 kPa for instance then it is 0 16 dB less sensitive at sea level 101 3 kPa The sensitivity of the 377B02 and LxT vary slightly with temperature also The coeffic...

Страница 100: ...rature and pressure The coefficient of static pressure is 0 01 dB kPa If the system is calibrated at 85 kPa for instance then it is 0 16 dB less sensitive at sea level The sensitivity of the 375A02 an...

Страница 101: ...t box in the Calibrator section and enter the correct information about a calibrator press 5 to complete the entry as shown in Figure 7 3 When the calibration level calibration frequency and calibrato...

Страница 102: ...ne being used is selected from the Sensitivity tab shown in FIGURE 7 2 Larson Davis Microphone If using one of the Larson Davis microphones most frequently used with the LxT highlight the down arrow p...

Страница 103: ...p down list while the left portion can be used for text entry Use the 4 key to select the left portion of the data field and press 5 to bring up the cursor Enter descriptive text to define the microph...

Страница 104: ...e Range of Normal Sensitivity When the results of the calibration correspond to a sensitivity greater than 3 dB outside the range of the nominal sensitivity for that microphone the message shown in FI...

Страница 105: ...the energy sum of the microphone self noise preamplifier self noise and instrument self noise When using one of the following preamplifiers identified automatically when plugged into the LxT Direct PR...

Страница 106: ...ata base See also Direct Data Input on page 7 13 Overload Level The overload level is the highest peak level which can be measured without overloading the input of the LxT Under Range Level The Under...

Страница 107: ...7 14 Calibration Without Preamplifier LxT Manual FIGURE 7 9 Sensitivity Tab Without Preamplifier In this situation the sensitivity of the transducer and the self noise can be entered directly if known...

Страница 108: ...one year is recommended but this can be lengthened or disabled depending on applicable requirements The user has the opportunity to set the calibration interval and a calibration reminder Certificati...

Страница 109: ...ys 45 Days 60 Days Never The default value is Never Notification When appropriate the message Certification will expire in xx days or Certification has expired is displayed as follows When the instrum...

Страница 110: ...LxT Manual Certification 7 17...

Страница 111: ...to annotate measurements Voice recordings can be made with or without a headset are sampled at 8 kHz and can be up to 20 seconds long Launching the Voice Recorder Dialog To activate the voice recorder...

Страница 112: ...eadset as described in Chapter 12 System Properties When a headset is connected to the headset jack voice recordings are made using the headset microphone and are played back through the headset Witho...

Страница 113: ...ce records are presented in a list on the dialog To play back a recording via the headset jack select the desired recording in the list and press the right soft key labeled with the icon Storing Voice...

Страница 114: ...l for automatic logging is extended to 100 milliseconds Acoustical Parameters Table 9 1 shows the acoustical broadband level parameters that are logged for Time History Parameter Label Description Leq...

Страница 115: ...y using A weighting and Fast detector This also requires selection from the Preferences tab Takt Maximal Data Ltwa1 and Ltwa2 time weighted averages associated with Dose 1 and Dose 2 exchange rates an...

Страница 116: ...been selected to be 500 ms or less the parameter Tms causes the time value to be measured and saved with higher resolution Time History Setup To set up Time History navigate to the Time History tab as...

Страница 117: ...following values are available for selection as time increments for Time History Milliseconds 100 200 500 Seconds 1 2 5 10 15 20 30 When navigating down on the display to select values the menu appear...

Страница 118: ...e LxT is not equipped with the optional firmware LXT OB3 or if it is equipped with this option but the measurement of 1 1 and 1 3 octave spectra has been set to Off in the measurement setup all measur...

Страница 119: ...to move the cursor right or left respectively in increments equal to the time history period FIGURE 9 5 Measured Data at Cursor Position Left Right Arrow Keys For the display shown in FIGURE 9 5 the...

Страница 120: ...mber remains the same Doing so changes the lower portion of the display to that shown in FIGURE 9 7 FIGURE 9 7 Left Right Arrow Change Metrics When the left right arrow symbols appear to the left of o...

Страница 121: ...in FIGURE 9 8 the 4 and 6 keys can be used to either navigate through record numbers displaying the spectra for each or to move the cursor in the spectrum displays Press 5 to toggle between the roles...

Страница 122: ...user definable markers Markers Setup The default values for these parameters are shown in FIGURE 9 10 Markers are setup using the Markers tab as shown in Figure 9 10 FIGURE 9 10 Markers Setup Window M...

Страница 123: ...ent digit positions in the data field using the 4 and 6 keys as shown in Figure 9 12 FIGURE 9 12 Marker Name Field Enter a marker name and press 5 to conclude the process Using Markers The Time Histor...

Страница 124: ...an be set On or Off Select the field of the desired marker Pressing the 4 key toggles the marker status between Off and On Setting All Markers Off To set all markers to Off press the right softkey lab...

Страница 125: ...12 Markers LxT Manual The first display labeled Run represents the keypress initiating the measurement with the corresponding data and time There is no measured data associated with this sample point...

Страница 126: ...as described in the chapter entitled Run Modes You can perform a sequence of measurements either manually or automatically that are stored in a single file To enable Measurement History follow these...

Страница 127: ...ess 5 Enter the desired time and press 5 Interval Time Sync The interval time sync feature ensures that all measurement records except the first begin at a time equal to a multiple of the measurement...

Страница 128: ...red The Time Stop Mode with Measurement History has a feature not included for the other run modes the ability to automatically measure and store a user defined number of records then stop Subsequent...

Страница 129: ...or display on the Measurement tab The Current tab is then reset and begins displaying data for the next measurement in progress As a result the Current tab always displays the measurement in progress...

Страница 130: ...lays data for any of the previously completed measurements These measurement records are numbered in sequence from the first to the last The data displayed on the History page of the Measurement tab i...

Страница 131: ...es of the Measurement tab except the History page the selected record number is indicated below the graph as shown in FIGURE 10 6 FIGURE 10 6 Profile Page Level versus Time Graph for the Selected Reco...

Страница 132: ...figured setup the Measurement tab may include up to 14 tabs TABLE 10 2 shows Measurement tab pages that may appear on your meter The table includes the page name and an example of how the page may app...

Страница 133: ...10 8 Display of Measurement History LxT Manual 3 Digital 4 Leq 5 1 1 Octave Page Sequence Page Name Example TABLE 10 2 Measurement Tab Pages...

Страница 134: ...LxT Manual Display of Measurement History 10 9 6 1 3 Octave 7 Dose 1 7 Dose 2 Page Sequence Page Name Example TABLE 10 2 Measurement Tab Pages...

Страница 135: ...10 10 Display of Measurement History LxT Manual 9 SEL 10 SEA 11 Percentiles Page Sequence Page Name Example TABLE 10 2 Measurement Tab Pages...

Страница 136: ...LxT Manual Display of Measurement History 10 11 12 Exceedances 13 Overloads 14 Miscellaneous Page Sequence Page Name Example TABLE 10 2 Measurement Tab Pages...

Страница 137: ...isplayed record shift to a non spectrum display to make the change then return to the frequency spectrum display Link to Time History Time History must be enabled before linking to the Time History ta...

Страница 138: ...Explorer Page press the 3 TOOLS key Select the Data Explorer icon as shown in FIGURE 11 1 FIGURE 11 1 Control Panel Press 5 ENTER to open the Data Explorer Page Data Explorer is a directory of all the...

Страница 139: ...iles in sequence By page pressing the up or down arrow key moves the to the first or last data file displayed on pages Press the left softkey labeled By page to toggle between modes as shown in FIGURE...

Страница 140: ...l deletes all the stored data files Rename The Rename option enables you to change the name of the selected data file Pressing 5 brings up a message box for editing the file name as shown in FIGURE 11...

Страница 141: ...to be overwritten in the file name field Select Yes and press 5 to display the Overwrite Confirmation menu as shown in FIGURE 11 7 FIGURE 11 7 Overwrite Confirmation Select the desired option and pres...

Страница 142: ...LxT Manual Control Panel Data Explorer 11 5 Jump to Beginning The Jump to Beginning option selects the first data file listed Jump to End The Jump to End option selects the last data file listed...

Страница 143: ...11 6 Control Panel Data Explorer LxT Manual...

Страница 144: ...bs which you can use to identify or control functions of the sound level meter not related to sound measurement or calculations Control Panel System Properties To activate the System Properties tabs p...

Страница 145: ...s shown in Figure 12 2 This can identify the owners company name and address FIGURE 12 2 Device Tab Select and edit one of the three fields Press 5 ENTER to highlight the 1st character position in the...

Страница 146: ...and Year Navigate to select the Day and Year fields for System Date Press 5 to select the 1st character position Use the 8 2 4 and 6 keys to change the values Press 5 to select the desired value Sele...

Страница 147: ...ed to the SLM Utility G3 or G4 software Select the check box and press 5 to turn this option on or off Power The Power tab contains options for managing how power is used by the sound level meter as s...

Страница 148: ...B communications etc Pressing the 0 ON OFF key returns the instrument and the displays the state it was in when the Auto Off time expired The auto off feature is ignored when the unit is connected to...

Страница 149: ...time set Pressing the 9 RUN PAUSE key or execution of an automatic timer restores power to the analog circuitry and the instrument can take data in a number of seconds To set the Power Save Time sele...

Страница 150: ...also cause an exit from the power save mode Calibration Recording voice or sound recording Playing voice or sound recording Backlight Time The Backlight Time field sets the duration of time the backl...

Страница 151: ...ect the backlight and its intensity as follows When the USB Host port is turned on the backlight turns off for five seconds When the USB Host port is on the backlight cannot be set to the Bright inten...

Страница 152: ...om incidence microphone a correction can be applied to provide a free field response Highlight the Mic Corr field and press 5 to open the Microphone Correction menu as shown in FIGURE 12 12 FIGURE 12...

Страница 153: ...surement you are prompted to save a data file If you select Yes the data file is saved If No is selected the data file is not saved If data is stored when the 9 key is pressed the instrument is automa...

Страница 154: ...so be set to Off Run Mode Type of Stop Auto Store Preference Prompt Store Timed Stop Timer activated final stop Prompts when timer is complete File automatically stored Manually activated stop key No...

Страница 155: ...select the check box or deselect it Takt Maximal Data When this option is checked the parameter LAFTMS is also measured and displayed on the Community Noise section of the Overall Screen and as a para...

Страница 156: ...mory Next the data is copied to USB memory without interfering with the operation of the instrument When the data file has been successfully copied the original data file in internal memory is deleted...

Страница 157: ...he message shown in FIGURE 12 19 appears FIGURE 12 19 Print Complete Message Print Error Messages Printing without connecting the printer or with the printer off results in the message shown in FIGURE...

Страница 158: ...ary from one country or region to another as shown in FIGURE 12 22 FIGURE 12 22 Localization Tab To change the fields on the Localization tab navigate and select values as discussed in previous sectio...

Страница 159: ...the decimal symbol Period Comma Select the Decimal Symbol field and press 5 as shown FIGURE 12 24 FIGURE 12 24 Decimal Symbol Preferences Select the desired symbol and press 5 Date Format The LxT sup...

Страница 160: ...E 12 26 Units Menu Select the desired units and press 5 Displays The default values for the Displays tab are shown in FIGURE 12 27 The Displays tab contains options for customization of the displays a...

Страница 161: ...of interest for a measurement the instrument operation can be streamlined by hiding selected displays As a default all available displays are set to appear Tab Display Selection Use the 2 key to sele...

Страница 162: ...LxT Manual Displays 12 19 Live Tab Displays 6 FIGURE 12 30 Live Tab Displays Overall Tab Displays 15 FIGURE 12 31 Overall Tab Displays Session Log Display FIGURE 12 32 Session Log Displays...

Страница 163: ...12 20 Displays LxT Manual Current Display 14 Measurement Display 13 Time History Displays 5 FIGURE 12 33 Time History Tab Displays All checked displays appear on the LxT...

Страница 164: ...e unchecked Use the 2 and 8 keys to highlight different displays and set them as desired When finished setting the display types for this tab press 5 When all desired modifications have been made to t...

Страница 165: ...nchecking removes the option To mask or unmask any option s press 5 to enter the dialog mode Use the 2 and 8 arrow keys to highlight each option and use 4 and 5 to toggle the state of the option betwe...

Страница 166: ...roduces the message shown in FIGURE 12 38 indicating that the instrument must be rebooted for the masking unmasking changes to take effect FIGURE 12 38 Reminder to Reboot Instrument Press 5 to return...

Страница 167: ...12 24 Options LxT Manual...

Страница 168: ...ts and data the LxT provides a lock feature When this is enabled the LxT is tamper proof to one of four user selectable levels of security Control Panel Lock To activate the Lock dialog press the 3 TO...

Страница 169: ...of the screen is updated A measurement may be running when this mode is enabled Pressing the 9 RUN PAUSE key begins a measurement A measurement cannot be paused Pressing the 7 STOP STORE key stops th...

Страница 170: ...eset when the Model LxT is locked in any mode Unlock Code Navigate to the Unlock Code field and press 5 to select it as shown in FIGURE 13 3 FIGURE 13 3 Unlock Code Press 5 The first character in the...

Страница 171: ...wn in FIGURE 13 4 If the box is checked calibration is allowed while the unit is locked and not running FIGURE 13 4 Allow Calibration When Locked Fully Locked When the LxT is fully locked the display...

Страница 172: ...gins the measurement A measurement cannot be paused stopped or stored in the Fully Locked mode Locked With Auto Store If the Locked w Auto Store mode has been selected upon accepting the changes on th...

Страница 173: ...nd a new measurement may be started by pressing the 9 key If No is selected the data is reset and a new measurement can be made Unlocking the LxT To unlock the LxT press the 3 key and 5 Or press the r...

Страница 174: ...es the storage process by displaying the Save File prompt as shown in FIGURE 13 10 FIGURE 13 10 Manual Store When Locked Select Yes to store the file number indicated No to abort the storage operation...

Страница 175: ...xT Manual If the Center Softkey indicating CAL is active as shown in FIGURE 13 11 press this key This displays the calibration screen See Calibration for complete details on calibrating the LxT FIGURE...

Страница 176: ...e instrument Control Panel About To activate the About tabs press the 3 TOOLS key and navigate to the About icon as shown in FIGURE 14 1 FIGURE 14 1 Control Panel About Tab The About tab displays impo...

Страница 177: ...the About tab FIGURE 14 2 About Tab Standards The Standards tab shown in FIGURE 14 3 lists standards met by the LxT For more information on the technical standards for the LxT refer to the section Sta...

Страница 178: ...eb site The Options tab shown in FIGURE 14 4 lists the options available for the LxT Installed options have a check mark next to them FIGURE 14 4 Options Tab User The User tab displays identifying inf...

Страница 179: ...14 4 User LxT Manual FIGURE 14 5 shows the User tab FIGURE 14 5 User Tab...

Страница 180: ...he 2 key one time in order to see the System Utilities icon on the Control Panel To activate the System Utilities press the 3 TOOLS key Use the 8 2 4 or 6 keys to select the System Utilities icon as s...

Страница 181: ...ws Check File System Format Format Restore Defaults Check Repair USB Format USB Select the desired function and press 5 to initiate the operation Warning Using these functions may cause loss of data a...

Страница 182: ...t data stored in USB memory Check Repair USB Always shut down the LxT completely before unplugging USB power connections Otherwise memory faults and memory wear may occur more quickly over time If you...

Страница 183: ...nd run this utility When the action has been completed the message shown in FIGURE 15 4 is displayed FIGURE 15 4 USB Drive Formatted Message The USB mass storage device is now formatted using FAT16 fi...

Страница 184: ...System 15 5 As a result the operation is denied and the message shown in FIGURE 15 6 is displayed The Copy to USB icon appears on the upper left corner of this display FIGURE 15 6 Cannot Check Repair...

Страница 185: ...15 6 File System LxT Manual...

Страница 186: ...user from the Measurement Settings tabs The frequency weighting for RMS and Impulse averaged sound levels are the same selected independent from the frequency weighting for peak detection RMS and Imp...

Страница 187: ...epresents the time weighting Fast Slow or Impulse 1 1 and or 1 3 Octave Frequency Spectra The LxT can perform just 1 1 or 1 3 octave real time frequency spectra measurements or they can both be measur...

Страница 188: ...ll Tab From the Overall tab the graphic shows the energy equivalent level calculated over the measurement time period at each frequency band and at the far right for the summation of all frequency ban...

Страница 189: ...and exponential averaging Slow or Fast selected when setting up the LxT for a sound level measurement These six values are user selected over the range L0 01 to L99 99 Community Noise Parameters When...

Страница 190: ...s RMS frequency weighting Y is peak frequency weighting and V is time weighting The Count is the number of times each parameter has exceed the preset level The duration is the total accumulated durati...

Страница 191: ...16 6 Miscellaneous Parameters LxT Manual...

Страница 192: ...ming a Save File operation utilizes 27 kilobytes of memory Session Log The amount of memory utilized in bytes when storing session logs is calculated as follows 52 12 Number of records where Number of...

Страница 193: ...ks is calculated as follows 52 16 4 Number of parameters enabled Number of records where Number of Records Number of Samples Number of Run Pause and Stop events Voice Messages The amount of memory uti...

Страница 194: ...te www LarsonDavis com to determine if you are using the most recent version of this software If not SLM Utility G3 is available for download as a zip file from the website To install the software ext...

Страница 195: ...18 2 Upgrading LxT Firmware LxT Manual Firmware upgrade is performed from the Manual Control tab as shown in FIGURE 18 1 FIGURE 18 1 Manual Control Page...

Страница 196: ...til the Select File dialog box shown in FIGURE 18 2 appears FIGURE 18 2 Select File Menu Firmware and options can be upgraded at the same time by enabling both check boxes Click Browse to select the f...

Страница 197: ...LxT a new options file is required To purchase additional options contact your local representative listed under Sales on the Larson Davis web site www LarsonDavis com The procedure for upgrading the...

Страница 198: ...mendment 1 1993 02 and Amendment 2 2000 10 Type 2 Group X IEC60804 2000 10 Type 2 Group X ANSI S1 4 2014 Class 1 ANSI S1 4 1983 R 2006 plus Amendment S1 4A 1985 R 2006 Type 2 ANSI S1 43 1997 R2007 Typ...

Страница 199: ...udes headset Ln statistics L0 01 through L99 9 available Blaze software available for setup control high speed data download analysis and reporting Multi tasking processor allows measuring while viewi...

Страница 200: ...or Impulse Frequency Weightings A C or Z See Frequency Weightings on page A 7 Peak detector Frequency weighting A C or Z Reference range Normal range Exchange rate 3 4 5 or 6 dB Sample rate 51 200 Hz...

Страница 201: ...5 dB 35 to 140 dB 100 dB 18 to 118 dB 104 dB 35 to 139 dB 100 dB 26 to 125 dB 107 dB V 10 to 117 dB V Z 103 dB 37 to 140 dB 93 dB 25 to 118 dB 100 dB 39 to 139 dB 93 dB 33 to 125 dB 103 dB V 14 to 117...

Страница 202: ...0 C Storage temperature 20 C to 70 C Humidity effects 0 5 dB error from 30 and 90 relative humidity at 40 C Equivalent microphone impedance 12 pF for Larson Davis 1 2 microphone Range level error OBA...

Страница 203: ...e instrument s display is specified in Table A 7 Higher resolution level dose and elapsed time data are available via I O commands and data file downloads Levels 0 1dB Dose 0 01 Elapsed time 0 1 secon...

Страница 204: ...0 0 44 7 4 4 0 2 0 5 1 5 31 5 31 62 0 0 39 4 3 0 0 2 0 5 1 5 40 39 81 0 0 34 6 2 0 0 2 0 5 1 0 50 50 12 0 0 30 2 1 3 0 5 0 5 1 0 63 63 10 0 0 26 2 0 8 0 5 0 5 1 0 80 79 43 0 0 22 5 0 5 0 5 0 5 1 0 10...

Страница 205: ...1 0 0 8 0 2 0 5 2 0 5000 5012 00 0 0 0 5 1 3 0 2 0 75 2 3 6300 6310 00 0 0 0 1 2 0 0 2 1 0 3 0 8000 7943 00 0 0 1 1 3 0 0 2 1 25 3 3 10000 10000 00 0 0 2 5 4 4 0 2 1 50 3 3 12500 12590 00 0 0 4 3 6 2...

Страница 206: ...LxT Manual Technical Specifications A 9 Typical Z Weight Frequency Response...

Страница 207: ...ut Gain relative to instrument input 39 2 dB AC Output Frequency Weighting Signal is unweighted with frequency limitations imposed by hardware design see below AC Output Frequency Response 20 Hz to 23...

Страница 208: ...for less than 0 4 error A 10 DC Voltmeter represents negligible error 0 036 The output resistance can be accounted for in the interface design For example if a chart recorder has an input load of 10...

Страница 209: ...time reference sources are used in the LxT depending on whether the unit power is on or off as described in Table A 11 FIGURE A 1 Frequency Stability vs Temperature Instrument Power State Ambient Tem...

Страница 210: ...LR6 Alkaline NiMH or Lithium cells External Power Powered through USB interface from computer or from PSA029 AC to DC Power Adapter 5 Volt 5 required Applying a voltage greater than specified can dam...

Страница 211: ...pied or if the LxT is within Data Explorer mode Real time Clock 10 minutes Table A 14 Memory Retention Without Batteries or External Power DC Output Voltage 5 Volts DC Output Regulation Line 5 Load DC...

Страница 212: ...5 Emissions FCC Part 15 Class B EN55022 Class B Immunity EN61000 4 2 Level 4 EN61000 4 3 Level 2 EN61000 4 4 Level 2 EN61000 4 5 Level 3 EN61000 4 6 Level 3 EN61000 4 11 Harmonic EN6100 3 2 A1 A2 A14...

Страница 213: ...nvironment 1 1 and 1 3 Octave Filters The 1 1 and 1 3 octave filters LXT OB1 and LXT OB3 Options comply with all requirements of IEC 61260 1995 including amendment 1 2001 for Class 1 These digital fil...

Страница 214: ...00 10 100 1000 10000 100000 Level dB Frequency Hz Freq Hz Measured dB Uncert dB Limits dB 63 10 88 46 0 10 70 00 inf 125 89 87 18 0 10 61 00 inf 251 19 81 81 0 10 42 00 inf 501 19 67 18 0 10 17 50 in...

Страница 215: ...0 00 100 00 100 1000 10000 Level dB Frequency Hz Freq Hz Measured dB Uncert dB Limits dB 185 46 90 61 0 10 70 00 inf 327 48 82 27 0 10 61 00 inf 531 43 68 01 0 10 42 00 inf 772 57 75 25 0 10 17 50 inf...

Страница 216: ...03 0 00 0 07 0 03 0 00 0 07 0 10 0 07 0 13 0 10 0 03 0 10 0 10 668 34 0 10 0 10 0 13 0 07 0 03 0 00 0 03 0 03 0 07 0 00 0 03 0 10 0 00 707 95 0 10 0 10 0 13 0 07 0 03 0 07 0 10 0 07 0 03 0 10 0 03 0 1...

Страница 217: ...0 17 0 27 0 27 0 23 0 13 7498 94 0 10 0 10 0 07 0 03 0 07 0 03 0 20 0 23 0 27 0 20 0 27 0 10 0 10 7943 28 0 30 0 37 0 30 0 23 0 33 0 23 0 33 0 40 0 37 0 33 0 33 0 20 0 17 8413 95 0 40 0 37 0 37 0 43 0...

Страница 218: ...e Mic B K Model 4189 Serial Number 2440346 Tested 11 23 05 08 44 02 6 0 dB 2 0 dB 2 0 dB 6 0 dB 10 0 dB 14 0 dB 18 0 dB 22 0 dB 26 0 dB 200 Hz 1K Hz 20K Hz Mic 0 Mic 60 Mic 120 Mic 180 LD Model LxT1 S...

Страница 219: ...ence Mic B K Model 4189 Serial Number 2440346 Tested 11 23 05 08 44 02 6 0 dB 2 0 dB 2 0 dB 6 0 dB 10 0 dB 14 0 dB 18 0 dB 22 0 dB 26 0 dB 200 Hz 1K Hz 20K Hz Mic 30 Mic 90 Mic 150 LD Model LxT1 Seria...

Страница 220: ...th 377B02 250 19 Hz LD Model LxT1 Serial 0010 Normalized to 251 19Hz 0 Tested 11 23 05 12 25 57 by LD Note PRMLxT1 0155 and 377B02 100650 Reference Mic B K Model 4189 Serial Number 2440346 Tested 11 2...

Страница 221: ...100650 Reference Mic B K Model 4189 Serial Number 2440346 Tested 11 23 05 08 44 02 90 0 6 0 dB 2 0 dB 2 0 dB 6 0 dB 10 0 dB 14 0 dB 18 0 dB Mic 1000 00 Hz Mic 1995 26 Hz Mic 3981 07 Hz Mic 7943 28 Hz...

Страница 222: ...25 Hz LD Model LxT1 Serial 0010 Normalized to 251 19Hz 0 Tested 11 23 05 12 25 57 by Alex T Note PRMLxT1 0155 and 377B02 100650 Reference Mic B K Model 4189 Serial Number 2440346 Tested 11 23 05 08 44...

Страница 223: ...22 11 15 49 15 by LD Note with LxT2 and PRMLxT2B Preamp Reference Mic B K Model 4189 Serial Number 2440346 Tested 06 22 11 14 04 53 2 0 dB 0 0 dB 2 0 dB 4 0 dB 6 0 dB 8 0 dB 10 0 dB 12 0 dB 14 0 dB 20...

Страница 224: ...ference Mic B K Model 4189 Serial Number 2440346 Tested 06 22 11 14 04 53 2 0 dB 0 0 dB 2 0 dB 4 0 dB 6 0 dB 8 0 dB 10 0 dB 12 0 dB 14 0 dB 200 Hz 1K Hz 20K Hz Mic 30 Mic 90 Mic 150 LD Model 375B02 Se...

Страница 225: ...with LxT2 and PRMLxT2B Preamp Reference Mic B K Model 4189 Serial Number 2440346 Tested 06 22 11 14 04 53 90 0 4 0 dB 0 0 dB 4 0 dB 8 0 dB 12 0 dB 16 0 dB 20 0 dB Mic 251 19 Hz LD Model 375B02 Serial...

Страница 226: ...00 Hz LD Model 375B02 Serial 010512 Normalized to 251 19Hz 0 Tested 06 22 11 15 49 15 by LD Note with LxT2 and PRMLxT2B Preamp Reference Mic B K Model 4189 Serial Number 2440346 Tested 06 22 11 14 04...

Страница 227: ...d as a function of frequency Graphic data is presented for both Normal and Low ranges while the tabular data are for Low range only but they include A C and Z weighted broadband noise level data LD Mo...

Страница 228: ...1 PRMLxT1 with 377B02 FIGURE A 17 Noise LxT1 377B02 PRMLxT1 Low Range LxT1 Low Range PRMLxT1 and 377B02 Noise 20 0 15 0 10 0 5 0 0 0 5 0 10 0 15 0 20 0 25 0 1 0 10 0 100 0 1000 0 10000 0 100000 0 Hz d...

Страница 229: ...s LxT Manual FIGURE A 18 Noise LxT1 377B02 PRMLxT1 Normal Range LxT1 Normal Range PRMLxT1 and 377B02 Noise 20 0 10 0 0 0 10 0 20 0 30 0 40 0 1 0 10 0 100 0 1000 0 10000 0 100000 0 Hz dB SPL Electronic...

Страница 230: ...2 50 1 12 8 12 2 12 8 63 1 11 6 11 2 11 6 79 4 10 6 10 2 10 6 100 0 9 9 9 2 10 0 125 9 9 7 8 2 9 8 158 5 9 5 7 2 9 6 199 5 9 2 6 2 9 3 251 2 9 2 5 2 9 4 316 2 9 2 4 2 9 4 398 1 9 7 3 2 9 9 501 2 10 0...

Страница 231: ...LxT1 PRMLxT1L with 377B02 FIGURE A 19 Noise LxT1 377B02 PRMLxT1L Low Range LxT1 Low Range PRMLxT1L and 377B02 Noise 20 0 15 0 10 0 5 0 0 0 5 0 10 0 15 0 1 0 10 0 100 0 1000 0 10000 0 100000 Hz dB SPL...

Страница 232: ...ns A 35 FIGURE A 20 Noise LxT1 377B02 PRMLxT1L Normal Range LxT1 Normal Range PRMLxT1L and 377B02 Noise 20 0 15 0 10 0 5 0 0 0 5 0 10 0 15 0 20 0 1 0 10 0 100 0 1000 0 10000 0 100000 0 Hz dB SPL Elect...

Страница 233: ...5 39 8 2 6 13 2 2 7 50 1 1 4 12 2 1 6 63 1 0 1 11 2 0 4 79 4 1 0 10 2 0 5 100 0 1 8 9 2 1 1 125 9 2 7 8 2 1 6 158 5 3 6 7 2 2 0 199 5 4 1 6 2 2 0 251 2 4 8 5 2 2 0 316 2 5 4 4 2 1 8 398 1 5 8 3 2 1 3...

Страница 234: ...ications A 37 LxT2 PRMLxT2B with 375B02 FIGURE A 21 Noise LxT2 375B02 PRMLxT2B Low Range LxT2 Low Range PRMLxT2B and 375B02 Noise 15 10 5 0 5 10 15 20 1 10 100 1000 10000 100000 Hz dB SPL Electronic N...

Страница 235: ...ications LxT Manual FIGURE A 22 Noise LxT2 375B02 PRMLxT2B Normal Range LxT2 Normal Range PRMLxT2B and 375B02 Noise 15 10 5 0 5 10 15 20 25 30 35 1 10 100 1000 10000 100000 Hz dB SPL Electronic Noise...

Страница 236: ...1 2 31 6 10 2 11 3 10 2 39 8 9 2 10 3 9 2 50 1 7 9 9 3 8 0 63 1 7 1 8 3 7 2 79 4 6 6 7 3 6 8 100 0 6 0 6 3 6 2 125 9 5 4 5 3 5 8 158 5 5 0 4 3 5 5 199 5 4 8 3 3 5 4 251 2 4 8 2 3 5 6 316 2 5 0 1 3 5 9...

Страница 237: ...ns LxT Manual LxT2 PRMLxT2L with 375B02 FIGURE A 23 Noise LxT2 375B02 PRMLxT2L Low Range LxT2 Low Range PRMLxT2L and 375B02 Noise 15 10 5 0 5 10 15 20 1 10 100 1000 10000 100000 Hz dB SPL Electronic N...

Страница 238: ...41 FIGURE A 24 Noise LxT2 375B02 PRMLxT2L Normal Range LxT2 Normal Range PRMLxT2 and 375A02 Noise 10 0 5 0 0 0 5 0 10 0 15 0 20 0 25 0 30 0 35 0 40 0 1 0 10 0 100 0 1000 0 10000 0 100000 0 Hz dB SPL E...

Страница 239: ...39 8 1 4 10 3 1 7 50 1 0 5 9 3 0 9 63 1 0 4 8 3 0 3 79 4 1 3 7 3 0 3 100 0 2 4 6 3 0 9 125 9 3 5 5 3 1 3 158 5 4 1 4 3 1 2 199 5 4 4 3 3 0 8 251 2 4 6 2 3 0 3 316 2 4 8 1 3 0 3 398 1 5 2 0 3 0 9 501...

Страница 240: ...troacoustic values are at 23 C 50 RH 7 5 Volt supply 3 m 10 cable and equivalent microphone of 18pF Frequency response with respect to the response at 1 kHz with 13 Volts rms input and 18 pF equivalen...

Страница 241: ...A peak Distortion Harmonics 58 dBC with 0 7 Volt rms output at 1 kHz Output Slew Rate 2 V S typical Electronic Noise with 18pF equivalent microphone 1 1 V typical A weighted 1 4 V max 1 6 V typical Fl...

Страница 242: ...To 20 kHz with 200 61 m cable Output Connector Switchcraft TA5M 5 Pin male Compatibility Use with Larson Davis 377B02 or any prepolarized microphone having about 50 mV Pa sensitivity and meeting the m...

Страница 243: ...0 100 00 0 01 0 016 0 10 0 10 125 89 0 01 0 016 0 10 0 10 158 49 0 01 0 016 0 10 0 10 199 53 0 01 0 016 0 10 0 10 251 19 0 01 0 016 0 10 0 10 316 23 0 01 0 016 0 10 0 10 398 11 0 00 0 016 0 10 0 10 50...

Страница 244: ...otherwise stated all electroacoustic values are at 23 C 50 RH 7 5 Volt supply 3 m 10 cable and equivalent microphone of 18pF Frequency response with respect to the response at 1 kHz with 1 1 Volts rm...

Страница 245: ...2 power supply voltage Power Supply Current 1 3 mA typical Temperature Sensitivity 0 1 dB from 10 to 50 C 14 to 122 F operating range to 60 C 140 F Humidity Sensitivity 0 1 dB from 0 to 90 RH non con...

Страница 246: ...eting the mechanical requirements of IEC 61094 4 It can be used with either the Larson Davis ADP043 or ADP008 adapters for or 1 prepolarized microphones Due to continual product improvement specificat...

Страница 247: ...11 100 00 0 01 0 016 0 09 0 11 125 89 0 01 0 016 0 09 0 11 158 49 0 01 0 016 0 09 0 11 199 53 0 01 0 016 0 09 0 10 251 19 0 00 0 016 0 10 0 10 316 23 0 00 0 016 0 10 0 10 398 11 0 00 0 016 0 10 0 10 5...

Страница 248: ...140 dBSPL Specifications Unless otherwise stated all electroacoustic values are at 23 C 50 RH 7 5 Volt supply 3 m 10 cable and equivalent microphone of 18pF Frequency response with respect to the res...

Страница 249: ...DC Output Level 1 2 power supply voltage Power Supply Current 1 3 mA typical Temperature Sensitivity 0 1 dB from 10 to 50 C 14 to 122 F operating range to 60 C 140 F Humidity Sensitivity 0 1 dB from 0...

Страница 250: ...having about 35 5 mV Pa sensitivity and meeting the mechanical requirements of IEC 61094 4 It can be used with either the Larson Davis ADP043 or ADP008 adapters for or 1 prepolarized microphones Pin S...

Страница 251: ...0 10 0 10 125 89 0 01 0 02 0 10 0 10 158 49 0 00 0 02 0 10 0 10 199 53 0 00 0 02 0 10 0 10 251 19 0 00 0 02 0 10 0 10 316 23 0 00 0 02 0 10 0 10 398 11 0 00 0 02 0 10 0 10 501 19 0 00 0 02 0 10 0 10...

Страница 252: ...coustic values are at 23 C 50 RH 7 5 Volt supply 3 m 10 cable and equivalent microphone of 18pF Frequency response with respect to the response at 1 kHz with 1 1 Volts rms input and 18 pF equivalent m...

Страница 253: ...2 power supply voltage Power Supply Current 1 3 mA typical Temperature Sensitivity 0 1 dB from 10 to 50 C 14 to 122 F operating range to 60 C 140 F Humidity Sensitivity 0 1 dB from 0 to 90 RH non con...

Страница 254: ...having about 35 5 mV Pa sensitivity and meeting the mechanical requirements of IEC 61094 4 It can be used with either the Larson Davis ADP043 or ADP008 adapters for or 1 prepolarized microphones Pin S...

Страница 255: ...11 100 00 0 01 0 016 0 09 0 11 125 89 0 01 0 016 0 09 0 11 158 49 0 01 0 016 0 09 0 11 199 53 0 01 0 016 0 09 0 10 251 19 0 01 0 016 0 10 0 10 316 23 0 00 0 016 0 10 0 10 398 11 0 00 0 016 0 10 0 10 5...

Страница 256: ...erpendicular to the diaphragm The resulting sound levels are measured using two different microphones The microphone connected to the instrument which is moving A reference microphone at a fixed posit...

Страница 257: ...hragm FIGURE A 30 Vibration Perpendicular to Microphone Diaphragm 500 52 6 51 4 630 60 5 50 4 800 61 0 54 4 1 000 62 2 60 0 Frequency Laeq Ref Table A 29 Axis of Vibration Parallel to the Microphone D...

Страница 258: ...pecifications A 61 Frequency Laeq Ref 31 5 35 9 35 6 63 38 6 34 5 125 46 0 35 5 250 54 1 39 4 500 67 1 44 2 630 82 6 70 0 800 69 7 45 7 1 000 69 2 51 7 Table A 30 Axis of Vibration Perpendicular to th...

Страница 259: ...A 62 Technical Specifications LxT Manual...

Страница 260: ...formation is not applicable as noted in the Comments column Further information called for in section 9 3 for testing as appropriate for a sound level meter can be found in Section 9 3 on page B 10 Se...

Страница 261: ...phone 5 2 4 Frequency Response and Corrections 5 2 5 Frequency Response and Corrections 5 2 7 Periodic Testing 5 2 8 Periodic Testing 5 4 12 No optional frequency responses 5 5 9 Linear Measurement S...

Страница 262: ...isplay 5 15 4 Data Display 5 15 5 General Specifications 5 15 6 Integration Method on SLM Tab 5 15 7 Software 5 15 8 The LxT uses no alternative display devices 5 16 1 Typical Z Weight Frequency Respo...

Страница 263: ...le increase in any direction with applica tion of 74 dB A weighted sound level 6 6 9 AC Power and Radio Frequency Susceptibil ity 7 1 Microphone Extension Cable 7 2 Effect of Windscreen 7 4 Octave Ban...

Страница 264: ...ifications i Sound Level Meter Specifications j Computer software is not an integral part of the LxT k None No optional fre quency weightings 9 2 3 Power Supply a Power Supply Battery Operating Lifeti...

Страница 265: ...l Timed Stop or Stop When Stable Modes i Hardkeys Leq j Overload Indication Leq k Measurement Range l Triggers Tab m Software n LxT Components o Inherent Noise p Typical Z Weight Frequency Response Ja...

Страница 266: ...configurations respectively In each information is provided which corresponds to the specific item number in this standard a No components of the LxT are intended to be operated only in an environment...

Страница 267: ...a Calibrator The calibrator to be used with the LxT1 is the Larson Davis Model CAL200 b Calibration Frequency The calibration check frequency is 1000 Hz c Calibration Procedure For calibration refer...

Страница 268: ...0 0 0 0 251 19 0 0 0 0 0 0 0 0 0 0 316 23 0 1 0 1 0 1 0 0 0 0 398 11 0 2 0 0 0 0 0 0 501 19 0 2 0 2 0 1 0 1 0 1 630 96 0 2 0 2 0 0 0 1 0 1 794 33 0 2 0 2 0 1 0 1 0 1 1000 00 0 0 0 0 0 1 0 0 0 0 1059...

Страница 269: ...0 0 0 3 0 3 0 1 6309 57 0 2 0 2 0 1 0 4 0 4 0 1 6683 44 0 1 0 1 0 1 0 1 0 1 0 1 7079 46 0 1 0 1 0 0 0 1 0 1 0 1 7498 94 0 0 0 0 0 1 0 4 0 4 0 1 7943 28 0 0 0 0 0 3 0 7 0 7 0 1 8413 95 0 3 0 3 0 4 0 5...

Страница 270: ...ing 0 Free Field 0 Free Field 0 Free Field Corrections 0 Free Field Corrections expanded Corrections with WS Corrections with WS uncertainty from from from from of Corrections B K 4226 B K 4226 B K UA...

Страница 271: ...at 20 C measured in a sealed cavity and vibration isolated 2 electronic noise of the instrument with an ADP090 in place of the microphone i Highest Sound Pressure Level The highest sound pressure leve...

Страница 272: ...els was with the LxT1 set to run and with an LxT EXC010 10 microphone extension cable used to connect the PRMLxT1 to the LxT1 Adding the USB cable did not emit more radio frequencies levels o AC Power...

Страница 273: ...5 0 5 0 3 0 2 0 2 0 4 1412 54 0 4 0 4 0 3 0 1 0 1 0 5 1496 24 0 4 0 4 0 3 0 2 0 2 0 5 1584 89 0 2 0 2 0 3 0 1 0 1 0 6 1678 80 0 3 0 3 0 4 0 1 0 1 0 6 1778 28 0 1 0 1 0 4 0 2 0 2 0 6 1883 65 0 2 0 2 0...

Страница 274: ...ghted levels used for periodic measurements 11220 18 0 8 0 8 0 1 0 9 0 9 0 8 11885 02 0 8 0 8 0 3 1 1 1 1 0 9 12589 25 0 8 0 8 0 2 1 0 1 0 1 0 13335 21 0 9 0 9 0 3 1 2 1 2 1 0 14125 38 1 1 1 1 0 3 1 4...

Страница 275: ...to 137 9 dB 38 dB to 134 7 dB Larson Davis LxT2 with PRMLxT2B Preamp and 375B02 Microphone adjustment data of A weighted levels used for periodic testing 0 Free Field 0 Free Field 0 Free Field Correc...

Страница 276: ...ough the ADP005 j Battery Power Voltage Range The battery power supply voltage range for which the LxT2 conform to this standard 6 4 Volts maximum The LxT will shut down if the battery is below 4 0 Vo...

Страница 277: ...0 V m n Radio Frequency Emission The mode of operation of the LxT2 that produced the greatest measurement radio frequency emission levels was with the LxT2 set to run and with an LxT EXC010 10 microph...

Страница 278: ...text Allowed Exposure Time Ti The allowed time of exposure to sound of a constant level given a Criterion Level Criterion Duration and Exchange Rate where Lc is the Criterion Sound Level Tc is the Cri...

Страница 279: ...T2 T1 and q is the Exchange Rate Factor Only sound levels above the Threshold Level are included in the integral Standard ANSI S12 19 CNEL In the state of California Community Noise Equivalent Level...

Страница 280: ...here q is the Exchange Rate Factor See Exchange Rate LC is the Criterion Sound Level Standard ANSI S1 25 Criterion Sound Level Lc The sound level which if continually applied for the Criterion Duratio...

Страница 281: ...are energy summed and converted to an average noise exposure rating The day evening night level LDEN is defined by the following formula In the default form the day has eight hours the evening has fo...

Страница 282: ...ating 24 hour integrated values Day Night Average Sound Level DNL Ldn A rating of community noise exposure to all sources of sound that differentiates between daytime and nighttime noise exposure The...

Страница 283: ...measure All decibel values are unit free and therefore the decibel value is not the value of the quantity itself but the ratio of that quantity to an actual reference quantity used Thus for every lev...

Страница 284: ...und power is equal to 3 dB and a doubling of the sound pressure is equal to 6 dB since a doubling of the sound pressure will result in a quadruple increase of the sound power Department of Defense Lev...

Страница 285: ...in hours L is the SLOW or FAST A weighted sound level a function of time when the sound level is greater than or equal to Lt or equals when the A weighted sound level is less than Lt Lt is the thresho...

Страница 286: ...ant n is the total number of samples taken in the measurement The sample rate is 32 samples per second Tc is the criterion sound duration as set by the LxT s Criterion Time Hours setting which by defa...

Страница 287: ...nverts the actual fluctuating sound or vibration signal from the microphone to one that indicates its amplitude It first squares the signal then averages it in accordance with the time weighting chara...

Страница 288: ...ulates equivalent continuous sound levels based on equations from IEC standard 61672 1 Section 3 9 which defines Leq as follows The LxT displays the equivalent con tinuous A weighted sound pressure le...

Страница 289: ...valent continuous sound pressure level Exchange Rate Q Exchange Rate Factor q Exposure Factor k It is defined in ANSI S1 25 as the change in sound level corresponding to a doubling or halving of the d...

Страница 290: ...eflections This does not mean that the sound is all coming from one direction as is often assumed since the source of sound may be spatially extensive See the definitions of near and far fields for mo...

Страница 291: ...ands per octave for finer frequency resolution Instruments with these filters have a sufficient number of them to cover the usual range of frequencies encountered in sound and vibration measurements T...

Страница 292: ...es Hz Weighting Network Frequency Response 1 3 Octave 1 Octave A B C 20 50 4 24 2 6 2 25 44 7 20 4 4 4 31 5 31 5 39 4 17 1 3 0 40 34 6 14 2 2 0 50 30 2 11 6 1 3 63 63 26 2 9 3 0 8 80 22 5 7 4 0 5 100...

Страница 293: ...ose used are Frontal incidence Free Field The microphone has been adjusted to have an optimally flat frequency response when in a space optimally free of reflections and when pointed at the source of...

Страница 294: ...positive pressure is applied to the other half the net force is zero and essentially no motion of the diaphragm occurs This occurs at high frequencies and for specific orientations of the microphone R...

Страница 295: ...ost common example of a near field is driving an automobile with an open window As you move your ear to the plane of the window the sound pressure level builds up rapidly wind noise since most of the...

Страница 296: ...per octave Pink light is similar to pink noise in that it has a higher level at the lower frequencies red end of the spectrum White A random sound that contains equal energy at each frequency In this...

Страница 297: ...log 2 for a 6dB exchange rate The factor of 100 in the equation produces a result that is a percentage Dose is obtained from the accumulations made for TWA and SEL using the formula where L s is the...

Страница 298: ...t the division of Criterion Time of the ANSI equation Projected Dose in the analyzer is obtained with an equation similar to that of Dose except that the actual duration time of the measurement is use...

Страница 299: ...ompressional changes in a medium solid liquid or gas that propagate to distant points It is characterized by changes in density pressure motion and temperature as well as other physical quantities Not...

Страница 300: ...re Factor See Exchange Rate Standard ANSI S1 25 Sound exposure and sound exposure level are calculated as specified in IEC 61672 1 The A weighted sound exposure EA of a specified event is represented...

Страница 301: ...a Alternatively SEL can also be calculated with this formula All of the SEL energy values in the sound level meter utilize the Threshold and Exchange Rate settings Care should be taken when modifying...

Страница 302: ...pressure of 20 Pa and T is the reference time of 1 second It is important to note that it is not an average since the reference time is not the same as the integration time The A weighted sound exposu...

Страница 303: ...e value of SEA is then determined as follows The formula implemented in the LxT is a simplification of the above N Ln 10 Leq peak value 10 log10 1 10 N n 0 SEA Leq peak value 10 log10 N Where SEA Acou...

Страница 304: ...he actual sound pressure is processed Sound Power W The sound power emitted by a sound source It is measured in Watts Sound Power Level PWL Lw The logarithmic form of sound power It is also expressed...

Страница 305: ...risk assessment Standard ANSI S1 25 Time Weighted Averages The Larson Davis LxT calculates many time integrated levels or time weighted averages TWA based on different parameters and time intervals T...

Страница 306: ...clude a threshold L s is set to if L s is less than the Threshold Level Lt k is the exchange rate constant which is equal to 10 00 for an exchange rate of 3dB Leq 13 29 for an exchange rate of 4dB LDO...

Страница 307: ...d in environmental 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 Impulse The time constant i...

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