SoundTrack LxTSound Level Meter

Technical Reference Manual

I770.01 Rev G Supporting Firmware Version 1.5

Technical Reference Manual

Larson Davis SoundTrack LxT

CopyrightCopyright 2006, 2007, 2008, 2009 by PCB Piezotronics, Inc. This manual is copyrighted, with allrights reserved. The manual may not be copied in whole or in part for any use without prior writtenconsent of PCB Piezotronics, Inc.

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Even though PCB Piezotronics, Inc. has reviewed its documentation, PCB Piezotronics, Inc. makes nowarranty or representation, either expressed or implied, with respect to this instrument anddocumentation, its quality, performance, merchantability, or fitness for a particular purpose. Thisdocumentation is subject to change without notice, and should not be construed as a commitment orrepresentation by PCB Piezotronics, Inc.

This publication may contain inaccuracies or typographical errors. PCB Piezotronics, Inc. willperiodically update the material for inclusion in new editions. Changes and improvements to theinformation described in this manual may be made at any time.

Record of Serial Number and Purchase Date

LxT Model: LxT1 LxT2 Serial Number: ___________

Preamplifier Model: _________ Serial Number: ___________

Microphone Model: _________ Serial Number: ___________

RecyclingPCB Piezotronics, Inc. is an environmentally friendly organization and encourages our customers tobe environmentally conscious. When this product reaches its end of life, please recycle the productthrough a local recycling center or return the product to:PCB Piezotronics, Inc.Attn: Recycling Coordinator1681 West 820 NorthProvo, Utah, USA 84601-1341where it will be accepted for disposal

Table of ContentsChapter 1 Introduction 1-1

About This Manual............................................................ 1-1Features............................................................................. 1-3

Hardware Features ...................................................... 1-3Basic Measurements.................................................... 1-4Basic Operation............................................................ 1-4Available Options ......................................................... 1-5Standard Accessories .................................................. 1-5

Microphone and Preamplifier ................................................ 1-5Software ................................................................................ 1-5Other ..................................................................................... 1-6

Optional Accessories ................................................... 1-6Microphones.......................................................................... 1-6Microphone Preamplifiers...................................................... 1-6Microphone and Preamplifier Configurations ........................ 1-6Equivalent Electrical Impedance Adaptor.............................. 1-6Cables ................................................................................... 1-7Power Supplies ..................................................................... 1-7Software ................................................................................ 1-7Accessory Kits....................................................................... 1-7Other ..................................................................................... 1-7

LxT Components.......................................................... 1-9

Chapter 2 Overview 2-1Display and Softkeys........................................................ 2-1Display Sections and Icons ............................................. 2-2

Screens ................................................................................. 2-2Tabs ...................................................................................... 2-2Page ...................................................................................... 2-2Scroll Bar and Section Indicator ............................................ 2-2Power Indicator ..................................................................... 2-2Measurement Name.............................................................. 2-2Stability Indicator ................................................................... 2-2Run Time............................................................................... 2-2Input Overload Icon ............................................................... 2-3LxT Technical Reference Manual Table of Contents ii-i

Under Range Icon.................................................................. 2-3OBA Overload Icon ................................................................ 2-3Measurement Status .............................................................. 2-4Softkeys ................................................................................. 2-4Changing Views ..................................................................... 2-5

Keypad............................................................................... 2-5ON/OFF Key................................................................. 2-5

Turn On The LxT.................................................................... 2-5Turn Off The LxT.................................................................... 2-5Power Control Page............................................................... 2-6

RESET Key .................................................................. 2-7Resetting When Running or Paused...................................... 2-7Resetting When Stopped ....................................................... 2-8Resetting When Reset ........................................................... 2-8Starting a New Measurement................................................. 2-8

TOOLS Key .................................................................. 2-8LEFT and RIGHT Keys ................................................ 2-9UP and DOWN Keys .................................................... 2-9ENTER Key .................................................................. 2-9RUN/PAUSE Key ......................................................... 2-9STOP/STORE Key ....................................................... 2-10

Screens .............................................................................. 2-10Data Display Screen .............................................................. 2-11Measurement Properties Screen ........................................... 2-11Tools Screen.......................................................................... 2-12Power Control Screen............................................................ 2-12

Data Display Screen..................................................... 2-12Changing Data Pages............................................................ 2-14Scrolling Between Sections.................................................... 2-14

Measurement Properties Screen.................................. 2-14Changing Setup Pages .......................................................... 2-15

Tools Screen ..................................................................... 2-15Data Explorer ............................................................... 2-16System Properties ........................................................ 2-16Lock.............................................................................. 2-17Calibrate ....................................................................... 2-17Voice Recorder............................................................. 2-17About ............................................................................ 2-18ii-ii Table of Contents LxT Technical Reference Manual

Chapter 3 First Use 3-1Unpacking and Inspection ............................................... 3-1

Record Serial Numbers of LxT and Components.................. 3-1Connecting the Microphone and Preamplifier ............... 3-2Connecting the Preamplifier to the LxT.......................... 3-3Disconnecting the Preamplifier from the LxT ................ 3-4Inserting Batteries ............................................................ 3-5Hardware Power Switch ................................................... 3-6Using USB Power ............................................................. 3-7

Chapter 4 Basic Measurement Setup 4-1Measurement Properties Screen..................................... 4-2

Accessing the Measurement Properties Screen ................... 4-2Settings In Use Message ...................................................... 4-2

Setup Pages ...................................................................... 4-3General Page ............................................................... 4-4SLM Page .................................................................... 4-5

Frequency Weighting ............................................................ 4-5Time Weighting ..................................................................... 4-5Integration Method ................................................................ 4-5

Octave Band Analyzer Page (Optional) ....................... 4-6OBA Parameter Selection ..................................................... 4-7OBA Time Averaging............................................................. 4-8

Dosimeter 1 and 2 Pages ................................................. 4-9Predefined Setups........................................................ 4-10Parameters Individually Defined .................................. 4-11

Name Field ............................................................................ 4-11Parameter Fields ................................................................... 4-11Exchange Rate...................................................................... 4-12Threshold and Criterion......................................................... 4-12Auto-Calculate....................................................................... 4-12

Ln Page........................................................................ 4-13Control Page ................................................................ 4-14

Manual Stop Mode ................................................................ 4-15Timed Stop Mode .................................................................. 4-15Stop When Stable Mode ....................................................... 4-16LxT Technical Reference Manual Table of Contents ii-iii

Triggers Page............................................................... 4-17Day/Night...................................................................... 4-18

LDN........................................................................................ 4-19LDEN ..................................................................................... 4-19CNEL ..................................................................................... 4-20

Exiting Measurement Property Screens ......................... 4-21

Chapter 5 Basic Data Display 5-1Data Labels........................................................................ 5-1Tabbed Page Structure..................................................... 5-1Live Page ........................................................................... 5-2

Under Range Condition ......................................................... 5-2Sound Level Profile ...................................................... 5-2Large Digit Sound Level ............................................... 5-31/1 Octave Band Analyzer (Optional) ........................... 5-4

Cursor .................................................................................... 5-41/3 Octave Band Analyzer (Optional) ........................... 5-5Triggering ..................................................................... 5-5Time, Battery Voltage and Memory .............................. 5-6

Overall Page ...................................................................... 5-7Under Range Condition ......................................................... 5-7

Overall Leq with Profile ................................................ 5-7Overall Large Digit Sound Level................................... 5-8Maximum, Minimum and Peak Sound Levels .............. 5-81/1 Octave Band Analyzer (Optional) ........................... 5-9

Leq ......................................................................................... 5-10Lmin ....................................................................................... 5-10Lmax ...................................................................................... 5-10

1/3 Octave Band Analyzer (Optional) ........................... 5-10Dosimeter 1 and 2 ........................................................ 5-11Sound Exposure........................................................... 5-12SEA .............................................................................. 5-13Ln Percentiles............................................................... 5-13Events .......................................................................... 5-14Overloads ..................................................................... 5-14Number of Measurements............................................ 5-15Community Noise ......................................................... 5-15

C-A and Impulsivity .......................................................... 5-16ii-iv Table of Contents LxT Technical Reference Manual

Session Log Page............................................................. 5-17Adjust Graph Scale........................................................... 5-18View Spectrum Normalized.............................................. 5-20

Live Display.................................................................. 5-20Selecting the Spectrum Type ................................................ 5-21Selecting the Reference Spectrum........................................ 5-21Normalize to a Live Spectrum ............................................... 5-22Normalizing using Frequency Weighting............................... 5-23

Overall Display ............................................................. 5-23Normalized using a Previously Measured Spectrum............. 5-25Normalizing using Frequency Weighting............................... 5-27

Graph Relative ............................................................. 5-27Return to Standard Display ................................................... 5-28

Chapter 6 Run Control 6-1Run Control Setup ............................................................ 6-1Run Modes Without Measurement History .................... 6-2

Manual, Timed Stop or Stop When Stable ............................ 6-3Continuous ............................................................................ 6-3Single Block Time or Daily Timer .......................................... 6-3Entering Delta Level .............................................................. 6-4Entering Time ........................................................................ 6-4

Run Mode with Measurement History............................. 6-5

Chapter 7 Making a Measurement 7-1Configuration of the System............................................ 7-1Switching On the LxT ....................................................... 7-1

Start-up Period ............................................................. 7-2Views............................................................................ 7-3Softkeys ....................................................................... 7-3

LxT Setup .......................................................................... 7-3Calibrating the LxT ........................................................... 7-3Positioning the LxT .......................................................... 7-4

Observer Position......................................................... 7-4Microphone Extension Cable ....................................... 7-4Use of a Windscreen.................................................... 7-4

Performing the Measurement .......................................... 7-6LxT Technical Reference Manual Table of Contents ii-v

Starting the Measurement ............................................ 7-6Data Display ................................................................. 7-6Measurement Range.................................................... 7-7

Overload/Under Range Levels............................................... 7-7Overload Indication ................................................................ 7-8Under Range Indication ......................................................... 7-8

Back Erase ................................................................... 7-9Time History Records............................................................. 7-11

Resetting the Measurement ......................................... 7-12Resetting When Running or Paused...................................... 7-12Resetting When Stopped ....................................................... 7-12Starting a New Measurement................................................. 7-12

Stopping the Measurement .......................................... 7-13Storing the Measurement................................................. 7-13

Overwriting a Saved File ........................................................ 7-14Low Level Sound Fields ............................................... 7-15

Recovery After Improper Shutdown ............................... 7-16Case 1 .......................................................................... 7-16

Normal Operation................................................................... 7-16Improper Shutdown................................................................ 7-16

Case 2 .......................................................................... 7-17Improper Shutdown................................................................ 7-17

Chapter 8 Voice Recording 8-1Control Page - Voice Recording ...................................... 8-1Voice Recorder.................................................................. 8-2

Record.......................................................................... 8-3Save Prompt .......................................................................... 8-3

Playback....................................................................... 8-4

Chapter 9 Time History 9-1Parameters Logged .......................................................... 9-1

Acoustical Parameters ................................................. 9-1Sound Pressure Level Values................................................ 9-1Instantaneous Values ............................................................ 9-1Specialized Acoustic Parameters........................................... 9-2Increased Timer Resolution ................................................... 9-21/1 and 1/3 Octave Spectra ................................................... 9-2

Non-Acoustical Parameters.......................................... 9-3ii-vi Table of Contents LxT Technical Reference Manual

Time in Milliseconds .............................................................. 9-3LxT Battery/Time ................................................................... 9-3

Time History Setup ........................................................... 9-3Set Time History Period ............................................... 9-4Select Time History Parameters .................................. 9-5

Exiting Time History Options ................................................. 9-5Time History Display ........................................................ 9-5

Single Value Metrics .................................................... 9-5Data Display at Cursor Position ............................................ 9-6Left/Right Arrow Keys............................................................ 9-7Displaying Other Single Value Metrics .................................. 9-8

Frequency Spectra....................................................... 9-9Left/Right Arrow Keys............................................................ 9-10

Link to Measurement History Display............................. 9-11Markers .............................................................................. 9-11

Markers Setup.............................................................. 9-12Naming a Marker................................................................... 9-13

Using Markers .............................................................. 9-13Setting Markers On/Off.......................................................... 9-14Setting All Markers Off .......................................................... 9-14Close Marker Control Window............................................... 9-14

Markers Display ........................................................... 9-14

Chapter 10 Measurement History 10-1Run Control with Measurement History ......................... 10-1Continuous and Timer Modes ......................................... 10-2

Interval Time Sync................................................................. 10-2Valid Measurement Times..................................................... 10-2Other Measurement Times.................................................... 10-3

Timed Stop Mode.............................................................. 10-3Measurement Counter........................................................... 10-3Example ................................................................................ 10-4

Manual and Stop When Stable Modes ............................ 10-4Display of Measurement History Data ............................ 10-5

Current Page................................................................ 10-5Measurement Page...................................................... 10-6

Record Profile Display........................................................... 10-9LxT Technical Reference Manual Table of Contents ii-vii

Changing Displayed Record .................................................. 10-9Storing a Time History Measurement ............................. 10-10Link to Time History ......................................................... 10-10

Chapter 11 Data Explorer 11-1Control Panel - Data Explorer .......................................... 11-1Data Explorer..................................................................... 11-1

Scrolling Modes ..................................................................... 11-2Menu Softkey ............................................................... 11-3

View ....................................................................................... 11-3Delete..................................................................................... 11-4Delete All................................................................................ 11-4Rename ................................................................................. 11-4Refresh List ............................................................................ 11-6Load Settings ......................................................................... 11-6Jump to Beginning ................................................................. 11-6Jump to End........................................................................... 11-6

Chapter 12 System Properties 12-1Control Panel - System Properties.................................. 12-1Device ................................................................................ 12-1Time.................................................................................... 12-2

Setting Day and Year ............................................................. 12-3Selecting the Month ............................................................... 12-3Sync Data/Time with PC ........................................................ 12-3

Power ................................................................................. 12-4Battery Type ................................................................. 12-4Auto-Off Time ............................................................... 12-5Power-Save Time......................................................... 12-6

Power Save Icon.................................................................... 12-6Exit from Power Save Mode................................................... 12-7

Backlight Time.............................................................. 12-7Backlight ....................................................................... 12-8

Preferences ....................................................................... 12-9Microphone Correction ................................................. 12-9Auto-Store .................................................................... 12-10

None ...................................................................................... 12-10Prompt ................................................................................... 12-10Store ...................................................................................... 12-10

Jack Function ............................................................... 12-11ii-viii Table of Contents LxT Technical Reference Manual

Reset Prompting .......................................................... 12-11Takt Maximal Data ....................................................... 12-11USB Host Port .............................................................. 12-12

USB Storage ......................................................................... 12-12USB Serial Printer (PRN003) ................................................ 12-12

Localization ....................................................................... 12-14Languages ................................................................... 12-15Decimal Symbol ........................................................... 12-15Date Format ................................................................. 12-16Units ............................................................................. 12-16

Displays ............................................................................. 12-17Start.............................................................................. 12-18Selecting Displays to Appear ....................................... 12-18

Tab Page Selection ............................................................... 12-18Display Selection................................................................... 12-18

Options .............................................................................. 12-21

Chapter 13 Lock/Unlock the LxT 13-1Control Panel - Lock......................................................... 13-1

Lock Modes.................................................................. 13-3Unlocked ............................................................................... 13-3Lock w/Auto-Store ................................................................. 13-3Lock w/Manual Store............................................................. 13-3Fully Locked .......................................................................... 13-3

Unlock Code................................................................. 13-3Allow Cal When Locked ............................................... 13-4

Fully Locked...................................................................... 13-5Locked With Auto-Store................................................... 13-6

Unlock ................................................................................... 13-7Locked With Manual-Store............................................... 13-7

Unlock ................................................................................... 13-8Calibration When The LxT Is Locked.............................. 13-8

Chapter 14 About 14-1Control Panel - About....................................................... 14-1About ................................................................................. 14-2LxT Technical Reference Manual Table of Contents ii-ix

Standards .......................................................................... 14-2Options .............................................................................. 14-3User .................................................................................... 14-3

Chapter 15 Calibration 15-1Calibration Overview ........................................................ 15-1

Sensitivity Determination........................................................ 15-1Overload/Under Range Conditions ........................................ 15-1Calibration Stability ................................................................ 15-1

Control Panel - Calibrate .................................................. 15-2Calibrate Page ....................................................................... 15-3History Page .......................................................................... 15-3Sensitivity Page ..................................................................... 15-4Certification Page................................................................... 15-4Exiting from the Calibration Function ..................................... 15-4

Acoustic Calibration ......................................................... 15-4Frequency Weighting ............................................................. 15-4

Calibrator ...................................................................... 15-5Recommended Calibrator ...................................................... 15-5Calibrating the LxT1 and 377B02 microphone....................... 15-5Calibrating the LxT2 and 375A02 microphone....................... 15-6Environmental Parameter Ranges......................................... 15-7Adding a Calibrator ................................................................ 15-8

Microphone Selection................................................... 15-9Performing the Calibration............................................ 15-10

Warning Messages ................................................................ 15-10Calibration Results ....................................................... 15-11

Sensitivity Page ................................................................ 15-12Noise Floor ................................................................... 15-12

Direct Data Input .................................................................... 15-13Overload Level ............................................................. 15-13Under Range Level ...................................................... 15-13

Calibration Without Preamplifier ..................................... 15-14Certification ....................................................................... 15-15

Certification Page Parameter Selection ................................. 15-15Notification ............................................................................. 15-16

Chapter 16 System Utilities 16-1Control Panel - System Utilities....................................... 16-1File System........................................................................ 16-2ii-x Table of Contents LxT Technical Reference Manual

Check File System ....................................................... 16-2Format.......................................................................... 16-3Format & Restore Defaults........................................... 16-3Check/Repair USB ....................................................... 16-3Format USB ................................................................. 16-3

Chapter 17 LxT Hardware 17-1Components...................................................................... 17-1

Microphone and Microphone Preamplifier ................... 17-2Display ......................................................................... 17-2Keypad ......................................................................... 17-3

Softkeys................................................................................. 17-3Hardkeys ............................................................................... 17-3

Connectors and Interfaces ........................................... 17-5Batteries ............................................................................ 17-6External Power Supply..................................................... 17-7

PSA029 ........................................................................ 17-8

Chapter 18 Parameters Measured 18-1Basic Sound Level Measurements.................................. 18-1

Frequency Weighting ................................................... 18-1RMS Averaging ............................................................ 18-2Sound Level Metrics Measured.................................... 18-21/1 and/or 1/3 Octave Frequency Spectra ................... 18-2

Sound Exposure Metrics Measured................................ 18-3Statistical Metrics Measured ........................................... 18-4Community Noise Parameters......................................... 18-4Exceedance Counters ...................................................... 18-4Miscellaneous Parameters............................................... 18-5

S.E.A. ........................................................................... 18-5C minus A..................................................................... 18-5Impulsivity .................................................................... 18-5

Chapter 19 Memory Utilization 19-1Out Of Memory Stop......................................................... 19-1Overall Data....................................................................... 19-1LxT Technical Reference Manual Table of Contents ii-xi

Session Log....................................................................... 19-1Measurement History ....................................................... 19-1

Base Measurement History Size............................................ 19-1Optional Metrics ..................................................................... 19-1

Time History ...................................................................... 19-2Voice Messages ................................................................ 19-2

Chapter 20 Upgrade Firmware and Options 20-1SLM Utility-G3 ................................................................... 20-1Upgrading LxT Firmware.................................................. 20-1

Define Path to Firmware Upgrade File................................... 20-5Upgrading Options ........................................................... 20-7

Saving an Option Upgrade File .................................... 20-7Implementing the Option Upgrade ............................... 20-7

Define Path to Option Upgrade File ....................................... 20-8

Appendix A Technical Specifications A-1Standards Met by LxT....................................................... A-1LxT Specifications ............................................................ A-2

Features ....................................................................... A-2Sound Level Meter Specifications ................................ A-3Performance Specifications.......................................... A-4Physical Characteristics ............................................... A-4General Specifications ................................................. A-6Resolution Specifications ............................................. A-6Frequency Weightings.................................................. A-8AC/DC Output .............................................................. A-9Min/Max Integration Time............................................. A-11Time of Day Drift .......................................................... A-11Power Supply ............................................................... A-13

Memory Retention.................................................................. A-13PSA029 AC to DC USB Power Adapter Specifications ......... A-14

Electromagnetic Emission ............................................... A-15Declaration of Conformity............................................. A-15

1/1 and 1/3 Octave Filters................................................. A-16Frequency Range .................................................................. A-16Filter Shapes.......................................................................... A-16

Position of Instrument and Operator .............................. A-19ii-xii Table of Contents LxT Technical Reference Manual

Effect of Windscreen .................................................... A-19Frequency Response ....................................................... A-21

LxT With 377B02 Free Field Microphone and PRMLxT1 Pre-amplifier........................................................................ A-21

Directional Characteristics..................................................... A-24LxT With 375A02 Free Field Microphone and PRMLxT2 Pre-amplifier........................................................................ A-28

Directional Characteristics..................................................... A-30Noise Levels................................................................. A-32

LxT1, PRMLxT1 with 377B02................................................ A-33LxT1, PRMLxT1L with 377B02.............................................. A-36LxT2, PRMLxT2 with 375A02................................................ A-39LxT2, PRMLxT2L with 375A02.............................................. A-42

Microphone Preamplifier Specifications ........................ A-45Model PRMLxT1 .......................................................... A-45

Specifications ........................................................................ A-45Optional Accessories:............................................................ A-49

Model PRMLxT1L ........................................................ A-51Specifications ........................................................................ A-51Optional Accessories:............................................................ A-54

Model PRMLxT2 .......................................................... A-56Specifications ........................................................................ A-56Optional Accessories:............................................................ A-59

Model PRMLxT2L ........................................................ A-61Specifications ........................................................................ A-61

Vibration Sensitivity ......................................................... A-65Vibration Parallel to the Microphone Diaphragm.......... A-65Vibration Perpendicular to the Microphone Diaphragm A-66..................................................................................... A-66

Appendix B Testing to IEC61672-1 B-1Sections 5, 6, 7 and 9 (except 9.3)................................... B-1LxT1 ................................................................................... B-8

Section 9.2.4 ................................................................ B-8a) Calibrator........................................................................... B-8b) Calibration Frequency ....................................................... B-8LxT Technical Reference Manual Table of Contents ii-xiii

c) Calibration Procedure ........................................................ B-8d) Frequency Response and Corrections .............................. B-9

Section 9.3 ................................................................... B-10a) Reference Sound Pressure Level ...................................... B-10b) Reference Level Range ..................................................... B-10c) Microphone Reference Point.............................................. B-10d) Periodic Testing ................................................................. B-10e) Linear Operating Range .................................................... B-11f) Linear Measurement Starting Level .................................... B-12g) Electrical Insert Signals...................................................... B-12h) Inherent Noise ................................................................... B-12i) Highest Sound Pressure Level............................................ B-12j) Battery Power Voltage Range............................................. B-13k ) Display Device .................................................................. B-13l) Typical Stabilization Time ................................................... B-13m) Field Strength > 10 V/m ................................................... B-13n) Radio Frequency Emission ................................................ B-13o) AC Power and Radio Frequency Susceptibility ................. B-13

LxT2.................................................................................... B-14Section 9.2.4 ................................................................ B-14

a) Calibrator ........................................................................... B-14b) Calibrator Frequency ......................................................... B-14c) Calibration Procedure ........................................................ B-14d) Frequency Response and Corrections .............................. B-15

Section 9.3 ................................................................... B-16a) Reference Sound Pressure Level ...................................... B-16b) Reference Level Range ..................................................... B-17c) Microphone Reference Point.............................................. B-17d) Periodic Testing ................................................................. B-17e) Linear Operating Range .................................................... B-18f) Linear Measurements Starting Level .................................. B-18g) Electrical Insert Signals...................................................... B-18h) Inherent Noise ................................................................... B-18i) Highest Sound Pressure Level............................................ B-19j) Battery Power Voltage Range............................................. B-19k) Display Device ................................................................... B-19l) Typical Stabilization Time ................................................... B-19m) Field Strength > 10 V/m ................................................... B-19n) Radio Frequency Emission ................................................ B-20o) AC Power and Radio Frequency Susceptibility ................. B-20ii-xiv Table of Contents LxT Technical Reference Manual

Appendix C Glossary C-1Allowed Exposure Time (Ti) .................................................. C-1Average Sound Level (Lavg)................................................. C-1Community Noise Equivalent Level (CNEL, Lden)................ C-2Criterion Duration (Tc) ........................................................... C-3Criterion Sound Exposure (CSE) .......................................... C-3Criterion Sound Level (Lc)..................................................... C-3Daily Personal Noise Exposure (LEP,d)................................ C-3Day-Night Average Sound Level (DNL, Ldn) ........................ C-3Decibel (dB)........................................................................... C-4Department of Defense Level (LDOD) .................................. C-7Dose ...................................................................................... C-7Detector................................................................................. C-7Eight Hour Time-Weighted Average Sound Level (L TWA(8)) C-8Energy Equivalent Sound Level (Leq)................................... C-8Exchange Rate (Q), Exchange Rate Factor (q), Exposure Factor (k).............................................................................................. C-8Far Field ................................................................................ C-8Free Field .............................................................................. C-9Frequency (Hz, rad/sec) ........................................................ C-9Frequency Band Pass Filter .................................................. C-9Frequency Filter - Weighted .................................................. C-10Leq ........................................................................................ C-11Level (dB) .............................................................................. C-12Measurement Duration (T) .................................................... C-12Microphone Guidelines.......................................................... C-12Near Field.............................................................................. C-14Noise ..................................................................................... C-15Noise Dose (D)...................................................................... C-15Noise Exposure ..................................................................... C-16OSHA Level (LOSHA) ........................................................... C-16Preamplifier ........................................................................... C-16Projected Noise Dose............................................................ C-16Single Event Noise Exposure Level (SENEL, LAX) .............. C-16Sound .................................................................................... C-16Sound Exposure (SE)............................................................ C-17Sound Exposure Level (SEL, LE).......................................... C-17Sound Pressure..................................................................... C-18LxT Technical Reference Manual Table of Contents ii-xv

Sound Pressure Level (SPL, Lp)............................................ C-19Sound Power(W).................................................................... C-21Sound Power Level (PWL, Lw) .............................................. C-21Sound Speed, (c,) .................................................................. C-21Spectrum (Frequency Spectrum) ........................................... C-21Threshold Sound Level (Lt).................................................... C-21Time Weighted Average Sound Level (TWA, LTWA(TC)) ..... C-22Time Weighting ...................................................................... C-22Vibration................................................................................. C-22Wavelength (l) ........................................................................ C-22Wavenumber (k)..................................................................... C-23

Appendix D Integrated Level Calculations D-1Basic Integrated Level Calculations ............................... D-1

Equivalent Continuous Sound Level ............................ D-1Time-Weighted Averages............................................. D-2

SEL Calculations.................................................................... D-4Dose and Projected Dose Calculations .......................... D-5Sound Exposure Calculations ......................................... D-8

Sound Exposure........................................................... D-8Sound Exposure Level ................................................. D-9SEA .............................................................................. D-9

Community Noise Descriptors ........................................ D-11LDN........................................................................................ D-11LDEN ..................................................................................... D-11CNEL ..................................................................................... D-12ii-xvi Table of Contents LxT Technical Reference Manual

List of FiguresIntroduction............................................................1-1

The LxT.............................................................................. 1-9LxT Bottom View.............................................................. 1-10

Overview.................................................................2-1Data Display Screen.......................................................... 2-1Power Control View ........................................................... 2-6Stop Required Prompt ....................................................... 2-7Control Panel ..................................................................... 2-8Main View Block Diagram................................................ 2-11Menu................................................................................ 2-11Data Display Screens ...................................................... 2-13Measurement Properties Screen..................................... 2-15Tools Screen.................................................................... 2-15Highlighting a Tools Icon ................................................. 2-16System Property Pages................................................... 2-17Softkey Selection of About Pages ................................... 2-18

First Use .................................................................3-1Microphone........................................................................ 3-2Microphone-Preamplifier.................................................... 3-2Preamplifier Connected ..................................................... 3-3Push Button to Release Preamplifier................................. 3-4Disconnect The Preamplifier.............................................. 3-4Battery Door....................................................................... 3-5Insert Batteries................................................................... 3-6

Basic Measurement Setup...................................4-1Settings In Use By SLM Utility-G3 Message ..................... 4-2

Tabbed Setup Pages......................................................... 4-3General Page..................................................................... 4-4SLM Page.......................................................................... 4-5OBA Page.......................................................................... 4-6OBA Parameter Selection.................................................. 4-7Dosimeter 1 ....................................................................... 4-9Predefined Dose Setups.................................................. 4-10IEC................................................................................... 4-11Exchange Rate List.......................................................... 4-12Ln Page ........................................................................... 4-13Control Page.................................................................... 4-14Run Mode Menu .............................................................. 4-14Manual Run Mode ........................................................... 4-15Timed Stop Run Mode..................................................... 4-15Entering Time in Timed Stop Run Mode.......................... 4-16Stop When Stable Run Mode .......................................... 4-16Triggers Page .................................................................. 4-17Day/Evening/Night Definition ........................................... 4-18Apply Changes ................................................................ 4-21

Basic Data Display ................................................5-1Tabbed Page Structure...................................................... 5-1Live Page, Section 1.......................................................... 5-2Live Page, Section 2.......................................................... 5-3Live Page, Section 3.......................................................... 5-4Live Page, Section 4.......................................................... 5-5Live Page, Section 5.......................................................... 5-5Live Page, Section 6.......................................................... 5-6Overall Page, Section 1 ..................................................... 5-7

Overall Page, Section 2 ..................................................... 5-8Overall Page, Section 3 ..................................................... 5-8Overall Page, Section 4 ..................................................... 5-9Overall Page, Section 5 ................................................... 5-10Dosimeter 1 & 2 Display, Sections 6 and 7 ..................... 5-11Overall Page, Section 8 ................................................... 5-12SEA Display, Section 9.................................................... 5-13Overall Page, Section 10 ................................................. 5-14Overall Page, Section 11 ................................................. 5-14Overall Page, Section 12 ................................................. 5-14Overall Page, Number of Measurements by Type, Section 13......................................................................................... 5-15Community Noise, Section 14 ......................................... 5-15C-A Level and Impulsivity, Section 15 ............................. 5-16Session Log Page............................................................ 5-17Menu................................................................................ 5-18Adjust Graph Menu.......................................................... 5-19Standard Live Spectrum Display ..................................... 5-20Menu................................................................................ 5-20Normalized Live Spectrum Display.................................. 5-21Live Reference Menu....................................................... 5-21Live Spectrum Normalized to Reference Spectrum 1...... 5-22Spectrum From FIGURE 5-25: Normalized using -A....... 5-23Overall Spectrum............................................................. 5-24Menu................................................................................ 5-24Normalized Overall Spectrum: No Reference Selected... 5-24Spectrum Type Menu ...................................................... 5-25Overall Reference Menu.................................................. 5-25

Lmin Spectrum Normalized to Lmin Spectrum ................ 5-26Lmax - Lmin Spectrum..................................................... 5-26Leq Spectrum Normalized by - A..................................... 5-27Lmin Normalized by Lmax, Standard Display Scale........ 5-28Lmin Normalized by Lmax, Graph Relative Display Scale5-28

Run Control............................................................6-1Control Page...................................................................... 6-1Run Mode Menu ................................................................ 6-2Setup of Manual Stop, Timed Stop and Stop When Stable Run Modes........................................................................................... 6-3Setup of Continuous, Daily Timer and Single Block Time Run Modes........................................................................................... 6-4Auto-Store Report Start Time ............................................ 6-5

Making a Measurement .........................................7-1Boot Graphic...................................................................... 7-2Data Display Screen, Live Page........................................ 7-2Softkeys............................................................................. 7-3Position of Windscreen...................................................... 7-5Placement of Windscreen.................................................. 7-5Leq and Running SPL........................................................ 7-6Multiple Sound Level Parameters...................................... 7-7Normal vs. Under Range Data Display Pausing the Measurement........................................................................................... 7-8Five Second Back Erase Label.......................................... 7-9Back Erase Undo Indication ............................................ 7-10Ten Second Back Erase Label ........................................ 7-11Stop Required Prompt ..................................................... 7-12Save File Menu................................................................ 7-13

Saved Data Files ............................................................. 7-14Overwriting a Saved File.................................................. 7-14Overwrite Confirmation .................................................... 7-15Improper Shutdown Sequence, Case 2........................... 7-18

Voice Recording ....................................................8-1Control Panel ..................................................................... 8-1Voice Recorder .................................................................. 8-2Recording .......................................................................... 8-3Save Recording Prompt..................................................... 8-3Playback ............................................................................ 8-4

Time History...........................................................9-1Time History Setup Menu .................................................. 9-3Time History Setup Menu: Enabled ................................... 9-4Time History Period Menu ................................................. 9-4Time History Options Window ........................................... 9-5Time History Display: First Point; Keypress....................... 9-6Measured Data at Cursor Position, First Parameter.......... 9-7Left/Right Arrow Change Record....................................... 9-7Left/Right Arrow Change Metrics....................................... 9-8Time History Graph and Value of LApeak at Same Time as FIGURE 9-6......................................................................................... 9-9Time History Display: Spectra Metrics, Section 2 and 3.. 9-10Left/Right Arrow Change Record..................................... 9-10Left/Right Arrow Change Frequency ............................... 9-11Link to Measurement History Display .............................. 9-11Markers Setup Window, Markers 1 - 5 ............................ 9-12Markers Setup Window, Markers 6 - 10 .......................... 9-12Marker Name Field .......................................................... 9-13

Menu Options .................................................................. 9-13Time History Display with Markers .................................. 9-13Marker Indication on Time ............................................... 9-14

Measurement History ..........................................10-1Measurement History Setup ............................................ 10-1Measurement Time Menu................................................ 10-2Measurement Counter ..................................................... 10-3Time History Display: Current Page, Section 1 ............... 10-5Measurement Record Display: Measurement Page, Section One......................................................................................... 10-6Measurement History Displays ........................................ 10-8Profile Display: Measurement Page, Section 2 ............... 10-9Link to Time History Display .......................................... 10-10Time History Display...................................................... 10-10

Data Explorer .......................................................11-1Control Panel ................................................................... 11-1Data Explorer................................................................... 11-2Data Explorer Menu......................................................... 11-3Data View Page............................................................... 11-3Delete File........................................................................ 11-4Delete All Files................................................................. 11-4Rename File .................................................................... 11-4File Name List.................................................................. 11-5Selection of File to be Overwritten................................... 11-5Overwrite Confirmation .................................................... 11-5

System Properties ...............................................12-1Control Panel ................................................................... 12-1Device Page .................................................................... 12-2

Time Page ....................................................................... 12-2Month List ........................................................................ 12-3Power Page ..................................................................... 12-4Battery Type Menu .......................................................... 12-4Auto-Off Time Menu ........................................................ 12-5Power-Save Time Menu .................................................. 12-6Backlight Time Menu ....................................................... 12-7Backlight Menu ................................................................ 12-8Preferences Page............................................................ 12-9Microphone Correction Menu .......................................... 12-9Auto-Store Preferences ................................................. 12-10Jack Function Preferences ............................................ 12-11USB Host Port On/Off Menu.......................................... 12-12USB Storage Preferences ............................................. 12-12Print Summary Menu Item............................................. 12-13Print Screen Menu Item................................................. 12-13Print Complete Message ............................................... 12-13Printer Not Present Message......................................... 12-14Printer Disconnected Message...................................... 12-14Localization Page .......................................................... 12-14Language Preferences .................................................. 12-15Decimal Symbol Preferences ........................................ 12-15Date Format Preferences .............................................. 12-16Units Menu..................................................................... 12-16Displays Page................................................................ 12-17Display Start Options..................................................... 12-18Display Tab Page Options ............................................. 12-18Live Page Displays ........................................................ 12-19

Overall Page Displays ................................................... 12-19Session Log Displays .................................................... 12-19Time History Displays .................................................... 12-20Display; Set to Appear or Hide ...................................... 12-21Options Page................................................................. 12-21Sound Recorder Masked............................................... 12-22Apply Changes .............................................................. 12-22Reminder to Reboot Instrument..................................... 12-22

Lock/Unlock the LxT ...........................................13-1Control Panel ................................................................... 13-1Lock Page........................................................................ 13-2Lock Mode List................................................................. 13-2Unlock Code .................................................................... 13-3Apply Changes ................................................................ 13-4Allow Cal Check Box ....................................................... 13-4Fully Locked..................................................................... 13-5Are You Sure ................................................................... 13-5Unlock.............................................................................. 13-5Locked with Auto Store or Manual Store ......................... 13-6Auto-Store-Stop............................................................... 13-6Auto-Store-Unlock ........................................................... 13-7Manual Store When Locked ............................................ 13-7Locked with Calibration Permitted ................................... 13-8

About ....................................................................14-1Control Panel ................................................................... 14-1About Page...................................................................... 14-2Standards Page............................................................... 14-2Options Page................................................................... 14-3

User Page........................................................................ 14-3

Calibration............................................................15-1Control Panel ................................................................... 15-2Calibration Pages ............................................................ 15-3New Calibrator ................................................................. 15-8Microphone Selection List................................................ 15-9Calibrating...................................................................... 15-10Save Calibration ............................................................ 15-10Outside Normal Sensitivity Range................................. 15-110.5 dB From Previous Calibration Result....................... 15-11Sensitivity Page ............................................................. 15-12Sensitivity Page Without Preamplifier............................ 15-14Certification Page .......................................................... 15-15Certification Page Parameter Selection......................... 15-15Message: Calibration will expire ................................... 15-16Message: Calibration has expired ................................. 15-16

System Utilities....................................................16-1Control Panel ................................................................... 16-1File System...................................................................... 16-2USB Check/Repair Done Message ................................. 16-3USB Drive Formatted Message....................................... 16-4USB File System Not Found Message ............................ 16-4Cannot Check/Repair/Format Message .......................... 16-5

LxT Hardware.......................................................17-1LxT Front View................................................................. 17-1LxT Keys.......................................................................... 17-3LxT Bottom Panel ............................................................ 17-5Battery Status Icons......................................................... 17-6

External Power Icon......................................................... 17-7

Parameters Measured .........................................18-1Memory Utilization...............................................19-1Upgrade Firmware and Options.........................20-1

Instrument Manager......................................................... 20-2Manual Control Page....................................................... 20-3SLMFirmwareProgrammer .............................................. 20-4Select File Menu.............................................................. 20-5Confirm Choices Menu .................................................... 20-6Loading Firmware Screen for Firmware Upgrade............ 20-7Loading Firmware Screen for Modification of Options..... 20-8Technical Specifications ...................................................A- 1Temperature Stability vs Temperature ............................A-12Passband of 1kHz 1/1 Octave Filter ................................A-17Filter Skirts of 1kHz 1/3 Octave Filter ..............................A-18LxT with 377B02 Microphone: 0, 60,120 and 180 degreeA-21LxT with 377B02 Microphone: 15, 75 and 135 degrees ..A-22LxT with 377B02 Microphone: 30, 90 and 150 degrees ..A-22LxT with 377B02 Microphone: 45, 105 and 165 degrees A-23LxT with 377B02: 250.19 Hz............................................A-24LxT with 377B02: 1000.00 Hz, 1995.26 Hz, 3981.07 and 7943.28 Hz.........................................................................................A-25LxT with 377B02 Microphone: 1258.93 Hz, 2511.89 Hz, 5011.87 Hz and 10000.00 Hz .............................................................A-26LxT with 377B02 Microphone: 1584.89 Hz, 3162.28 Hz, 6309.57 Hz and 12589.25 Hz .............................................................A-27LxT with 375A02 Microphone: 0, 60 and 120 degree......A-28LxT with 375A02 Microphone: 15, 75 and 135 degrees ..A-28LxT with 375A02 Microphone: 30, 90 and 150 degrees ..A-29

LxT with 375A02 Microphone: 45, 105 and 165 degrees A-29LxT with 375A02 Microphone: 251.19 Hz........................A-30LxT with 375A02 Microphone: 1000.00 Hz, 1995.26 Hz, 3981.07 and 7943.28 Hz ......................................................................A-31LxT with 375A02 Microphone: 1258.93 Hz, 2511.89 Hz, 5011.87 Hz and 10000.00 Hz .............................................................A-31LxT with 375A02 Microphone: 1584.89 Hz, 3162.28 Hz, 6309.57 Hz and 12589.25 Hz .............................................................A-32Noise: LxT1, 377B02, PRMLxT1; Low Range.................A-33Noise: LxT1, 377B02, PRMLxT1; Normal Range............A-34Noise: LxT1, 377B02, PRMLxT1L; Low Range...............A-36Noise: LxT1, 377B02, PRMLxT1L; Normal Range..........A-37Noise: LxT2, 375A02, PRMLxT2; Low Range.................A-39Noise: LxT2, 375A02, PRMLxT2; Normal Range............A-40Nisei LxT2, 375A02, PRMLxT2L; Low Range .................A-42Noise: LxT2, 375A02, PRMLxT2L; Normal Range..........A-43Certificate of Conformance; PRMLxT1............................A-50Certificate of Conformance; PRMLxT1L..........................A-55Certificate of Conformance; PRMLxT2............................A-60Certificate of Conformance; PRMLxT2L..........................A-64Vibration Parallel to Microphone Diaphragm ...................A-65Vibration Perpendicular to Microphone Diaphragm.........A-66Testing to IEC61672-1......................................................B- 1Glossary............................................................................C- 1Integrated Level Calculations ...........................................D- 1TWA...................................................................................D-3Sound Exposure Level and Sound Exposure....................D-5DOSE and Projected DOSE ..............................................D-8

List of TablesIntroduction............................................................ 1-1

Microphone and Preamplifier........................................ 1-5Overview................................................................. 2-1

Chapters Describing Functions From the Control Panel 2-9First Use ................................................................. 3-1 Basic Measurement Setup................................... 4-1

Predefined Noise Dosimeter Setups............................. 4-10Basic Data Display ................................................ 5-1Run Control............................................................ 6-1Making a Measurement ......................................... 7-1Voice Recording .................................................... 8-1Time History........................................................... 9-1Measurement History ............................................ 10-1

Examples of Displays on Measurement Page.............. 10-7Data Explorer ......................................................... 11-1System Properties ................................................. 12-1Lock/Unlock the LxT ............................................. 13-1About ...................................................................... 14-1Calibration.............................................................. 15-1

Recommended Calibrators for Use with LxT1 and LxT2 15-5Environmental Parameter Ranges for Calibration ........ 15-7

System Utilities...................................................... 16-1LxT Hardware......................................................... 17-1

Keypad Hardkeys ......................................................... 17-4Parameters Measured ........................................... 18-1

Sound Level Metrics Measured .................................... 18-2Sound Exposure Metrics Measured.............................. 18-4

Memory Utilization................................................. 19-1Upgrade Firmware and Options ........................... 20-1Technical Specifications................................. A- 1

Standards Met by LxT................................................... A-1LxT Features................................................................. A-2

Sound Level Meter Specifications ................................ A-3LxT Performance Specifications ................................... A-4Physical Characteristics................................................ A-4General Specifications.................................................. A-6Resolution Specifications.............................................. A-6Frequency Weightings.................................................. A-8AC/DC Output............................................................... A-10Min/Max Integration Time ............................................. A-11Time of Day Drift........................................................... A-12Power Supply Specifications ........................................ A-13Battery Operating Lifetime............................................ A-13Memory Retention Without Batteries or External Power A-13PSA029 AC to DC USB Power Adapter Specifications A-14Directional Response, 3 1/2" Windscreen .................... A-20Noise; LxT1, PRMLxT1 with 377B02; Low Range........ A-35Noise; LxT1 with PRMLxT1L and 377B02; Low Range A-38Noise; LxT2, PRMLxT2 with 375A02; Low Range........ A-41Noise; LxT2, PRMLxT2L with 375A02; Low Range...... A-44LxT Preamplifiers.......................................................... A-45Output Connector ......................................................... A-48Optional Accessories .................................................... A-49Input Connector ............................................................ A-53Optional Accessories .................................................... A-54Input Connector ............................................................ A-58Optional Accessories .................................................... A-59Input Connector ............................................................ A-63Optional Accessories .................................................... A-63Axis of Vibration Parallel to the Microphone Diaphragm A-65Axis of Vibration Perpendicular to the Microphone Diaphragm...................................................................................... A-66

Testing to IEC61672-1 ..................................... B- 1Glossary ........................................................... C- 1Integrated Level Calculations......................... D- 1

C H A P T E R

1 IntroductionWelcome to the Larson Davis SoundTrack LxT. This versatile instrument, with graphic display, performs the functions of several instruments. It puts the combined features of a precision sound level meter and a real-time frequency analyzer in the palm of your hand.

About This ManualThis manual has 18 chapters and 5 appendices covering thefollowing topics:Chapters Chapter 1 - Introduction: Orients the user to the

contents of this user manual and the LxT features,functions and measurement capabilities.

Chapter 2 - First Use: Describes the process ofunpacking the LxT and preparing for first use.

Chapter 3 - Overview: A brief discussion of thedisplayed views, the keypad and navigation through thevarious functions of the LxT.

Chapter 4 - Basic Measurement Setup: A detaileddescription of setting up the LxT for the measurement ofbasic sound level parameters

Chapter 5 - Basic Data Display: A detailed look at thevarious metrics and information presented on thesescreens during and following a basic sound levelmeasurement.

Chapter 6 - Run Control: The LxT provides a numberof run modes to control the time duration of ameasurement. These include Manual Stop, Timed Stop,Stop when Stable, Continuous, Single Block Time andDaily Timer modes.

Chapter 7 - Making a Measurement: Describes theimportant steps in making an accurate sound levelmeasurement.

Chapter 8 - Voice Recording: The user is instructed inthe process of recording, reviewing and saving voiceLxT Technical Reference Manual Introduction 1-1

messages.

Chapter 9 - Time History: Describes the use of theoptional firmware LXT-LOG and LXT-HSLOG formeasuring time history data.

Chapter 10 - Data Explorer: Learn to use the DataExplorer to view stored data files, load settings from asaved data file and other operations.

Chapter 11 - System Properties: A discussion ofinstrument related functions.

Chapter 12 - Lock and Unlock The LxT: A discussionof the various scenarios to lock or unlock the LxT andthe interaction with running a measurement.

Chapter 13 - Calibration: Describes the process ofcalibrating an LxT.

Chapter 14 - About: A look at basic LxT system relatedinformation.

Chapter 15 - System Utilities: A description of theutilities available within the LxT.

Chapter 16 - Hardware: A description of the majorhardware related features of the LxT.

Chapter 17 - Parameters Measured: An overview ofthe many parameters measured and recorded by the LxT

Chapter 18 - Memory Utilization: Presents formulas todetermine the memory used when saving parameters tointernal memory

Chapter 19 - Upgrade Firmware/Add Options:Describes the procedure for upgrading firmware versionsand adding options to the LxT

Appendices Appendix A - Technical Specifications: Provides a

listing of acoustic, electronic, environmental andphysical characteristics of the LxT.

Appendix B - Measuring to IEC61672-1: Providesspecifications and information specifically required toappear in the manual by this standard.

Appendix C - Integrated Level Calculations: providesinformation on TWA, Leq, SEL, Dose and ProjectedDose calculations.

Appendix D - Glossary: Contains technical definitionsof key acoustic and vibration terms.1-2 About This Manual LxT Techncial Reference Manual

Appendix E - Warranty/Customer Satisfaction: Apresentation of warranty and customer satisfactionpolicies.

Features

Hardware Features

The Larson Davis SoundTrack LxT has the followingfeatures: Precision integrating sound level meter 256 MB unformatted standard data memory (2 GB

optional) 160 X 240 graphic LCD display with backlight and

icon-driven user interface Silent Touch elastomeric keypad Large dynamic range providing single SLM display

page Jack for AC/DC output or headset microphone and

speaker Compatible with 61 m (200 ft.) microphone extension

cable (full scale to 20 kHz) 4-AA batteries provide 16 hour operating time USB 2.0 full speed peripheral connector and AC/DC

output Multiple language support: English, French,

German, Italian, Portuguese, Spanish and Swedish. Field-upgradeable firmware WS001 windscreenLxT Technical Reference Manual Features 1-3

Basic Measurements

SPL, Leq, Lmax, Lmin, SEL, Lpeak, Lpeak(max) RMS Detectors: Slow, Fast & Impulse RMS Frequency Weighting: A, C & Z Peak Frequency Weighting: A, C & Z LN statistics: 6 user-selected values over the range

(L0.01 through L99.99) and Histogram tables 2 Sets of hygiene metrics: Lavg, TWA(x), Dose,

ProjDose, Lep,d E, E8, E40 SEA peak exposure 2 RMS event counters and 3 Peak event counters

Basic Operation

Auto-Store with Auto-Reset Run Timer and Stop-When-Stable Control Real-time clock Start time, elapsed time and paused time Time stamping for Lmax, Lmin, Lpeak(max) metrics Session Log Lock functions Calibration with calibration history and list of

calibrators Power management Status bar and About display Multiple languages Data files and Data Explorer Automatic data backup to prevent data loss on power

failure Overall measurement1-4 Features LxT Techncial Reference Manual

Available Options

Real-time 1/1 Octave Frequency Analysis (LXT-OB1) Real-time 1/3 & 1/1 Octave Frequency Analysis

(LXT-OB3) Automatic Data Logging with intervals from 1 second

to 24 hours (LXT-LOG). Add LXT-HSLOG as well toobtain intervals down to 100 milliseconds.

Measurement History Environmental Data Logging(LXT-ENV)

Community Noise (LXT-CN) Digital Voice Annotation (LXT-DVA) (includes SLM

LxT Headset ACC003) 2 GB Memory (LXT-MEM2G)

Standard Accessories

The LxT is delivered with the standard accessories describedbelow.

Microphone and Preamplifier

The LxT is delivered with one of the followingcombinations of microphone and microphone preamplifer.

Software

SLM Utility-G3 software, providing setup utilities,calibration routines, remote instrument control fromPC, data downloading and export of data to 3rd partysoftware such as MS Excel. Also includesSLMScreengrabber to capture and save screendisplays as bitmap files. CBL138 USB cable requiredfor utilization.

Instrument Microphone Preamplifier MicrophoneMicrophone Sensitivity

IEC 61672-1 Conformance

Measurement Range

LxT1 PRMLxT1 377B02 50 mV/Pa Class 1 38 dB to 140 dB

LxT2 PRMLxT2 375A02 22.6 mV/Pa Class 2 37 dB to 139 dB

Table 1-1 Microphone and PreamplifierLxT Technical Reference Manual Features 1-5

Other

Windscreen, 3 1/2 in. diameter (WS001) Alkaline Batteries: 4-AA Lanyard

Optional Accessories

Microphones

1/2 in. free-field prepolarized microphone, 50 mV/Pa(order 377B02)

1/2 in. free-field prepolarized microphone, 23 mV/Pa(order 375A02)

Microphone Preamplifiers

PRMLxT1 Type 1 with 23 dB capacitive attenuation PRMLxT2 Type 2 with 15 dB capacitive attenuation PRMLxT1L Low-Level Type 1 with no attenuation PRMLxT2L Low-Level Type 2 with no attenuation

Microphone and Preamplifier Configurations

PRMLxT1 or PRMLxT1L with 377B02 PRMLxT2 or PRMLxT2L with 375A02 PRMLxT1 with 377C01 (including ADP043 adapter)

Equivalent Electrical Impedance Adaptor

An equivalent electrical impedance adapter can be used inplace of the microphone when the instrument is beingmeasured electrically. The adapter is simply a seriescapacitor with the same capacitance as the microphone it isreplacing. The following adapters will be available for sale. ADP002 6.8pF Adaptor for 1/4 in., 7pF microphone

(377B01 or C01) ADP005 18pF for 1/2 in., 18pF microphone (375A02) ADP090 12pF for 1/2 in., 12 pF microphone (377B02)1-6 Features LxT Techncial Reference Manual

Cables

Direct Input Cable or Adaptor Microphone Extension Cable (shielded): EXCXXX,

where XXX is the length in feet (XXX = 010, 020, 050,066, 100 and 200 available).

USB Cable: CBL138 AC/DC Output Cable: CBL139

Power Supplies

Universal AC Power Adaptor: PSA029 12 Volt DC to USB Power Adaptor: PSA031

Software

Blaze software (SWW-BLAZE-LXT) for setup,control and high speed data download.

DNA (Data, Navigation and Analysis) software forinstrument control, high speed data download, datastreaming with real-time data display on PC,advanced data graphic presentations and powerfulreport generation features.

Accessory Kits

LXT-ACC includingLXT-CCS Hard Shell CaseCAL200 Class I CalibratorPSA029 Power SupplyCBL138 USB Cable

LXT-ACC1 includingLXT-CCS Hard Shell CaseCAL200 Class I CalibratorPSA029 Power SupplyCBL138 USB Cable

Other

Headset with microphone for voice recording/playback (ACC003). Note: this is included with theoptional accessory LXT-DVA

Storage Case: LXT-CCSLxT Technical Reference Manual Features 1-7

Environmental Protection EPS2106-2 Environmental Shroud EPS2108-2 Environmental Shroud EPS029-LXT: Environmental Case with two lead

acid batteries and integrated microphone mast EPS030-LXT: Environmental Case with one lead acid

battery: used with external microphone tripodTripods TRP001: Instrument/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 EPS029, EPS030 and EPS2106-2.Calibrators CAL150 CAL200Printer PRN003 USB Serial Printer1-8 Features LxT Techncial Reference Manual

LxT Components

FIGURE 1-1 The LxT

The SoundTrack LxT is a convenient hand-held sound levelmeter / real-time analyzer with a simple user interface.The standard LxT shown in FIGURE 1-1 includes thefollowing: 1/2 in. diameter condenser microphone Backlit graphic 160 x 240 pixel LCD display 13-key soft rubber backlit keypad AC/DC output, control, USB, and external power

connectors (shown in FIGURE 1-2) True hand held instrument with sure grip pads

Microphone

Preamplifier

LCD Display

Keypad

ConnectorsLxT Technical Reference Manual Features 1-9

FIGURE 1-2 LxT Bottom View

Hardware Power SwitchUSB Interface AC/DC Output and Headset Jack

AUX Connector1-10 Features LxT Techncial Reference Manual

C H A P T E R

2 OverviewDisplay and Softkeys

When the LxT is first switched on, the Data Display Screenwill appear. When a measurement is in progress, it will looksimilar to FIGURE 2-1 "Data Display Screen".

FIGURE 2-1 Data Display Screen

MeasurementName

OBA Overload Icon Input OverloadIcon

Run Time

MeasurementStatus

Power Indicator

Tabs

Live Page

SectionIndicator

Scroll Bar

StabilityIndicator

Left Center

Softkeys

RightLxT Technical Reference Manual Overview 2-1

Display Sections and IconsScreens

A Screen comprises everything which can be seen on thedisplay at one time. There are four different screensavailable with the LxT, which a