Larson Davis 831 - Page 118

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Model 831 Manual View Spectrum Normalized 5-39

FIGURE 5-47 Lmax - Lmin Spectrum

If the Model 831 were still running, the Lmax would

continue changing but the reference spectrum, based on the

Lmin spectrum measured previously, would remain the

same.

Main Page

Default Chapter4
- Table of Contents4
- 831 Features10
Chapter 1 831 Features10
- Hardware Features10
- Basic Measurements11
- Basic Operation11
- Available Options12
- Standard Accessories13
- Optional Accessories14
Chapter 2 First Use20
- First Use20
- Unpacking and Inspection20
- Connecting the Microphone and Preamplifier21
- Connecting the Preamplifier22
- Disconnecting the Preamplifier23
- Powering the Model 83123
- External Power Supply27
- 831 Components32
Chapter 3 Overview32
- Summary of Displays and Icons38
- Basic Run Functions43
- Navigating and Selecting43
- Tab and Setting Displays44
Chapter 6 Run Control45
- Parameter Selection51
Chapter 4 Basic Measurement Setup56
- Settings Screen56
- Setup Tabs57
- Exiting Settings Screen70
- Setup Manager71
Chapter 5 Data Display80
- Data Labels80
- Tabbed Structure80
- Live Tab81
- Overall Tab91
- Overall Slm94
- C-A and Impulsivity102
- Session Log Tab104
- Adjust Graph Scale108
- View Spectrum Normalized109
- Any Level Display120
Run Control124
- Run Control Setup124
- Run Mode with Measurement History126
- Run Modes Without Measurement History127
Chapter 7 Making a Measurement136
- Configuration of the System136
- Making a Measurement136
- Switching on the Model 831136
- Calibrating the Model 831138
- Model 831 Setup138
- Positioning the Model 831138
- Performing the Measurement140
  - Measurement Range143
  - Stopping the Measurement149
- Storing the Measurement150
- Recovery after Improper Shutdown153
- Calibration Overview156
Chapter 8 Calibration156
- Control Panel - Calibrate157
- Acoustic Calibration160
- Calibration History167
- Sensitivity Tab168
- Calibration Without Preamplifier170
- Certification171
- E.A. Check173
- E.A. History175
Chapter 9 Industrial Hygiene176
- Measurement Setup176
- Data Display180
Chapter 10 Voice Recording184
- Control Panel - Voice Recording184
- Voice Recording184
- Voice Recorder185
Chapter 11 Time History188
- Metrics Logged188
- Time History188
- Time History Setup191
- Time History Display196
- Locate Record Number203
- Link to Measurement History Display204
- Markers205
Chapter 12 Measurement History210
- Measurement History210
- Run Control with Measurement History210
- Continuous and Timer Modes211
- Timed Stop Mode212
- Display of Measurement History Data214
- Manual and Stop When Stable Modes214
- Link to Time History220
- Storing a Measurement History220
Chapter 13 Event History222
- Event History222
- Level Based Events222
- Event History Setup223
- Trigger Method229
- Event Time History Setup231
- Event History Display242
- Link to Time History and Measurement History243
Chapter 14 FFT and Tonality246
- Configuring a Measurement248
- Viewing and Analyzing Results255
- Storing Data266
- Viewing Stored Data266
- Return to Sound Level Meter Mode267
- Accessing RT-60 Mode268
- Accessing FFT Mode246
Chapter 15 RT-60268
- Making a Measurement270
- Viewing and Analyzing Results275
- Manually Controlling the Internal Noise Source283
- Customizing Measurements287
- General Settings288
- Storing Data293
- Viewing Stored Data293
- Quality Indicators294
- Accuracy Grade295
- Return to Sound Level Meter Mode296
Chapter 16 Sound Recording298
- Sound Recording Types298
- Sound Recording Setup299
- Manual Sound Recording304
- Marker Initiated Recording306
- Event Sound Recording311
- Measurement History Sound Recording315
- Combined Sound Recordings316
- Sound Recording Playback317
Chapter 17 Data Explorer322
- Data Explorer323
Chapter 18 System Properties332
- Device333
- Time334
- Power336
- Preferences341
- Time Zone349
- Localization351
- Date Format352
- Displays354
- Options360
- Logic I/O362
Chapter 19 Non-Acoustical Inputs364
- Weather Measurement Using 831-INT365
- Location Measurement Using 831-INT373
- Control Panel - Data Explorer322
- Control Panel - System Properties332
- 831-Int364
Chapter 20 Communication376
- Control Panel - Communication376
- Modem Tab378
- Wireless Tab381
- RS-232 Tab383
- SMS out387
- Network Tab388
- Status Tab390
- Troubleshooting395
Chapter 21 Lock/Unlock the Model 831404
- Control Panel - Lock404
- Lock/Unlock the Model 831404
- Fully Locked408
- Locked with Auto-Store409
- Locked with Manual-Store410
- Calibration When the Model 831 Is Locked411
- About414
Chapter 22 About414
- Control Panel - about414
- Standards415
- Options416
- User417
Chapter 23 System Utilities418
- Control Panel - System Utilities418
- System Utilities418
- File System419
- Basic Sound Level Measurements422
Chapter 24 Parameters Measured422
- Parameters Measured422
- Sound Exposure Metrics Measured424
- Statistical Metrics Measured425
- Event History (831-ELA Required)427
- Exceedance Counters427
- Measurement History (831-ELA Required)427
- Miscellaneous Parameters427
- Time History (831-LOG Required)427
Chapter 25 Memory Utilization428
- Memory Utilization428
- Out of Memory Stop428
- Overall Data428
- Session Log428
- Events429
- Measurement History429
- Time History429
- Sound Recording430
- Voice Messages430
- Bad Flash Blocks431
Chapter 26 Upgrade Firmware and Options432
- Upgrading Model 831 Firmware433
- Upgrading Options436
Appendix A Technical Specifications438
- Standards Met by Model 831438
- Model 831 Specifications439
- CE Information457
- 1/1 and 1/3 Octave Filters458
- Position of Instrument and Operator467
- Frequency Response469
- Specifications494
- Vibration Sensitivity499
- Sections 5, 6, 7 and 9 (Except 9.3508
Appendix B Measuring to IEC61672-1514
Appendix C Integrated Level Calculations514
- Basic Integrated Level Calculations514
- Community Noise Descriptors522
Appendix D Glossary526

Larson Davis 831 - Page 118

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