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Larson Davis 824 User Manual
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9/29/09
System 824 Views
5-1
CHAPTER
5
System 824 V
iews
This chapter introduces you to t
he various ways of viewing
measured data for a particular setup or ID of the System 824
.
Specifically
, this chapter co
vers the follo
wing topics:
•
Status icons
•
General views
•
SLM+R
T
A specific views
•
Logging SLM specific views
120
122
Table of Contents
Default Chapter
5
Table of Contents
5
Chapter 1 Introduction
21
About this Manual
21
Special Features of the Electronic Version
23
Bookmarks
23
Opening Bookmarks
23
Closing Bookmarks
24
Expanding Bookmarks
24
Click to Display Page
25
Return to Previous View
25
Links
25
About this Chapter
26
Formatting
26
Features
27
Hardware Features
27
System 824 Components
30
System Diagram
33
Getting Started
34
Unpacking and Inspection
34
Comments Concerning the Digital Signal Processor
36
Accessories and Optional Equipment
36
Connecting Internal or External Power
38
Using the Nimh Battery Pack
38
Using Alkaline Batteries or Individual Nimh Rechargable Cells
39
Using the AC Power Adapter
40
Chapter 2 Overview
41
System 824 Setups or Instrument Definitions
41
Instrument Definition (ID) Types
42
Write Protect, Delete, Write Enable Ids
42
Slm&Rta (Ssa)
42
Slm (Ism)
44
Logging (LOG)
44
Selecting a Measurement Setup
46
Performing a Measurement; SLM&RTA (SSA)
47
Stop, Pause and Back Erase Functions
48
Stopping and Starting Measurements
48
Pausing Measurements
48
Back Erasing
48
Changing the Detector of the Displayed SPL Value
48
Changing the Frequency Weighting of the Displayed SPL Value
49
Changing the Displayed Secondary Parameter
50
Changing the Frequency Weighting of the Displayed Lpeak Value
50
Changing the Amplitude Range, or Input Gain
50
Views
51
Selecting a VIEW
51
Data Storage and Recall
53
Storing Data
53
Recalling Data
53
Calibration
54
Correction of Calibrator Output Level
57
Chapter 3 Front Panel Keys; Functions and Menus
59
Power Key
61
Power-Up the Instrument / Viewing PWR Display
62
Power Settings
64
Extra Notes on Power Conservation
66
Run/Stop Key
66
R Reset Key
67
Pause Key
68
Pause
68
Pause, Back Erase
68
Preview
69
Lrud Arrow Keys
69
Check Key
70
View Key
70
D Data Key
71
S Setup Key
72
Save ID
74
Title
74
ID Name
74
Write Protect, Delete, Write Enable Ids
75
Ttools Key
76
About
78
Calibration
80
Clock/Timer
81
Memory
85
Deleting Stored Data
87
Delete Last Function
87
824 Memory Structure
87
Deleting the Last Stored Record
88
Deleting Individual Records
89
Power Monitor
91
Communication
92
P Print Key
95
Chapter 4 Quick Start
97
Turning on and Calibrating the System 824
97
High Range Calibration
100
Taking Measurements and Storing Data
101
SLM&RTA Measurements
101
Viewing RTA Displays During a Measurement
104
Recalling Stored Data
107
Selecting and Modifying Instrument Definitions (Ids)
108
The Setup Menu
109
The Active ID
109
Menu Scrolling
111
Permanent Ids
111
Write-Protected Ids
112
Preparing for a Measurement
112
Selecting a Different ID
113
Accessing the Settings Menu
113
Accessing the Settings Menu to Initiate Editing or Modification
114
Setting Control in the SLM View
118
Chapter 5 System 824 Views
121
Status Icons and Indicators
122
General Views
124
SLM Views
125
Any Data View
128
Any Level Format
128
Any Impulse Format
128
Any Time Format
129
SSA Specific Views
129
SSA Displays
131
SSA Displays Including 1/1 or 1/3 Octave Spectral Data
131
Tabular SSA Views
132
Time History Displays
133
SSA Intervals
133
SSA Time History
136
Run Log
139
Ln Centiles
139
Logging SLM Specific Views
143
Current SLM and Overall SLM Views
145
Current Slm/Overall SLM Display-A (SPL)
146
Current/Overall SLM Display-B (Times)
148
Current/Overall SLM Display-C (Min/Max)
149
Current/Overall SLM Display-D (Peaks)
149
Current/Overall SLM Display-E (TWA)
150
Exposure Views
151
Exposure Display-A
152
Exposure-B Display
153
Exposure-C Display
154
Ln Centiles Views
155
Ln-A Display
155
Ln-B Display
156
Stats Views
157
Stats-A Display
158
Stats-B Display
158
Stats-C Display
159
Run Log (LOG & SSA)
160
Time History
162
Single Other Level
163
Multiple Other Levels
163
Intervals
164
Intervals-A Display
164
Intervals-B Display
166
Intervals-C Display
167
Intervals-D Display
168
Intervals-E Display
169
Intervals-F Display
170
Exceedance History
172
Excd-A Display
172
Excd-B Display
173
Excd-C Display
174
Excd Time History Display
175
Daily Views
178
Daily-A Display
178
Daily-B Display
180
Daily-C Wind Display
181
Daily-D Windy Percent Display
182
Hourly Leq Display
183
Metrics
185
Metrics-A Display
185
Metrics-B Display
186
Passby
187
Wind/Tach
189
Wind-A Display
189
Wind-B Display
190
Wind-C Percent Display
191
Chapter 6 System 824 Virtual Instruments
195
Selecting an Instrument ID
197
Sound Spectrum Analyzer (SSA)
197
SSA Measuring Ranges
198
LN Percentiles (Spectral)
199
AC/DC Output
199
Logging SLM
201
Time History
201
Interval History
201
Exceedances
202
LN Percentiles (Broadband)
202
Sound Exposure
203
LOG and ISM Measuring Ranges
203
Chapter 7 Using ID Setting Files
205
Recalling ID Setting Files
205
Customizing Settings
206
Settings Example - SLM&RTA (SSA)
206
Settings Descriptions
208
Common SLM Settings
209
Title Setting - (SSA, LOG, ISM)
209
Detector Setting - (SSA, LOG, ISM)
209
Weighting Setting - (SSA, LOG, ISM)
210
Gain Setting - (SSA)
210
Range Setting - (LOG, ISM)
211
Transducer Setting - (SSA, LOG, ISM)
212
Random Incidence Microphone Correction - (Available to All Instrument Types)
212
Pk Weighting - (SSA, LOG, ISM)
213
RTA Detector Setting - (SSA)
213
RTA Weighting - (SSA)
214
Bandwidth Setting - (SSA)
214
Common Control Settings
214
Control Settings - (ISM)
214
Control Settings
215
AC/DC Output Settings - (SSA, LOG, ISM)
216
Logic Input Setting - (SSA, LOG, ISM)
216
Logic Output Setting - (SSA, LOG, ISM)
217
Logic Output Time Setting - (SSA, LOG, ISM)
219
Logic Output #2
220
Logic Output #2 Time Setting
220
Heater on
220
E. A. Cal Tone
220
Logging SLM TWA Settings
221
Ovll Exchange - (LOG)
221
Ovll Threshold - (LOG)
222
Ovll Criterion - (LOG)
222
Criterion Time - (LOG)
223
Crnt Exchange - (SSA, ISM, LOG)
223
Crnt Threshold (SSA, ISM, LOG)
224
Crnt Criterion (LOG)
224
LOG and SSA Ln Settings
224
Enable Ln
225
Start Level
225
Ln's
226
Spectral Ln's (SSA Only)
226
LOG and SSA Triggering Settings
227
SPL Excd Lvl 1 - (LOG, SSA)
227
SPL Excd Lvl 2 - (LOG, SSA)
227
PK Excd Lvl 1 - (LOG, SSA)
228
Pk Excd Lvl 2 - (LOG, SSA)
228
Hysteresis - (LOG, SSA)
228
LOG and SSA Wind/Tach Settings
229
Setup of Wind/Tach Function
230
Wind Scale
231
Wind Units
232
Direction Units
232
Wind/Tach Enable
233
Windy Threshold
233
Wind Exceedance Level
233
Windy Hysteresis
233
Wind Pause Enable
234
Pulse Trigger Voltage
234
Pulse Source
234
LOG and SSA Time History Settings
234
Hist Enable - (LOG, SSA)
236
Hist Period (LOG, SSA)
237
Period Units - (LOG, SSA)
237
Other Level - (LOG Only)
237
Resolution - (LOG, SSA)
238
Advanced Time History - (LOG, SSA)
239
Marker Text - (LOG, SSA)
239
LOG and SSA Interval Settings
240
Intv Enable - (LOG, SSA)
241
Intv Period - (LOG, SSA)
241
Intv Time Sync - (LOG, SSA)
241
Intv Save Ln's - (LOG, SSA)
242
Intv Auto Stop - (LOG, SSA)
242
Intv Threshold - (LOG, SSA)
243
Intv Exchange - (LOG, SSA)
243
Intv Spectrum - (SSA Only)
243
Logging SLM Exceedance History Settings
244
Triggering - (LOG)
244
Excd Enable - (LOG)
244
Min Duration - (LOG)
244
Excd Time Hist - (LOG)
245
Period - (LOG)
245
Excd Trigger - (LOG)
245
Excd Time - (LOG)
245
Timed Excd Period - (LOG)
245
Daily Enable - (LOG)
246
Daily Ln's - (LOG)
246
Logging SLM Define Report Settings
246
Data Report - (LOG, SSA)
247
Setup Report - (LOG, SSA)
247
SPL Histogram - (LOG)
248
Pk-1 Histogram - (LOG)
248
Pk-2 Histogram - (LOG)
248
Intv Report - (LOG, SSA)
248
Hist Report - (LOG, SSA)
249
Menu Layout of SSA Settings
249
Menu Layout of Integrating SLM (ISM) Settings
254
Menu Layout of Logging SLM Settings
256
Advanced Menu Layout
260
Check Menus
263
Check Menu Example
264
SLM Check Menu Options (SSA and LOG)
266
Mark Display
266
Graph Menu
268
Settings
269
Controls Settings Menu
269
Other SSA Check Menus
269
Any Data Check Menu
269
RTA Check Menu
270
Intervals Check Menu
271
Time History Check Menu
272
Run Log Check Menu
273
Ln Centiles Check Menus
274
Other Logging (LOG) Check Menus
277
Any Data Check Menu
277
Current SLM / Overall SLM Check Menu
277
Exposure Check Menu
277
LN Centiles Check Menu
278
Stats Check Menu
279
Run Log Check Menu
279
Time History Check Menu
280
Intervals Check Menu
280
Excd History Check Menu
281
Daily History Check Menu
282
Chapter 8 Printing a Report
285
Connecting the 824 to a Serial Printer
285
Printing Reports
286
Defining and Printing Tailored Reports
289
Using the Recall Format (SSA and LOG Instruments Only)
291
Default Settings Values for the Recall Format Reports
292
Printing a Custom Report
307
Chapter 9 Performing a Sound Level Measurement
313
Configuration of the System
313
Selecting a Measurement Mode
313
Selecting a Measurement ID
314
Editing the Microphone Parameters
315
Calibration
315
Entering the Noise Floor Values
316
Editing the Measurement Parameters
317
Positioning the Meter
319
Use of a Windscreen
319
Selecting the SLM Display
321
Selecting the Measurement Range
321
ISM and LOG Modes
321
Selecting the Range Setting
322
Performing a Measurement
323
Averaging Time
324
Linearity Range
325
Overload and under Range Conditions
326
Overload Condition
326
Reset
326
Under Range Condition
326
Max, Min and Peak Values
327
Measuring for a Preset Integration Time
328
Timer Mode
328
Measuring Using User-Selectable Thresholds
329
Chapter 10 Using the 824 Utility Software
331
824 Utility Installation
331
Starting the 824 Utility Software
332
Connecting to Your Computer
332
824 Utility Tool Bar
334
824 Utility Setup Window
336
Retrieving Setups from the 824
337
Modifying and Storing Setups to the 824
339
Changing System Settings
339
Manipulating a Setup
340
Saving Setups to Disk Files
342
Opening Setup Disk Files
342
Creating a New Setup
344
Renaming an Existing Setup
345
Deleting an Existing Setup
346
Locking and Unlocking Setups
347
Downloading Measurement Data
347
Specifying a Destination File
348
Changing the Download File Name
350
Adding Notes to a Download File
351
Selecting Active Measurements or Data Files
351
Downloading the Measurement
352
Explanation of Files in the 824 Utility Directory
354
Translating Data from a Downloaded Binary File
355
Selecting a Data Set to View
357
Printing a Translated File
359
Viewing a Translated File Within a Spreadsheet Program
361
Additional Features
362
Chapter 11 RTA (Optional)
367
Settings Menu
368
Settings Descriptions
372
RTA Settings Menu
372
Autostore Settings Menu
374
Arm Settings Menu
375
Trigger Settings Menu
377
End Settings Menu
378
Then Settings Menu
380
Trigger Settings Menu (Continued)
380
RT60 Reverberation Time Settings
382
RT60-A and RT60-B Instrument Definition
383
Qualifying Background Noise: Rooms [RTA] ID
384
Display Views
385
RTA Views
385
Trigger Views
389
Autostore Views
391
Autostore Bytime Spectral History
395
Bytime Spectrum Check Menu
396
Bytime Graph Check Menu
397
Rt-60
399
RT60 Check Menu
401
Spatial Avg Views
401
Spatial Avg Check Menu
403
Avg History Check Menu
404
Rooms Views
405
Chapter 12 FFT (Optional)
409
Features
409
Settings Menu
409
Settings Descriptions
411
FFT Display
414
Fft
414
FFT Check Menu
416
THD (Total Harmonic Distortion)
417
THD Check Menu
418
Snapshot
419
Snapshot Check Menu
420
FFT Calibration
421
Calibrating Db to a Different Reference
421
Displaying Amplitude in Linear Units
422
Setup of Linear Units Readout
423
Frequently Asked Questions Concerning FFT
425
Chapter 13 AUD (Optional)
431
Connecting the Test System
432
Selecting the 824-AUD Operation Mode
433
Microphone Sensitivity Calibration
434
AUD Modes
434
View Menu
435
SLM/RTA Submenu
435
FFT Submenu
435
Pulse/Fm Submenu
435
Display Sequence
436
SLM+RTA Live Display
436
SLM+RTA Live Check Menu
437
Any Level -A, -B and -C Displays
438
Any Level Check Menu
439
Linearity RTA Display
440
Manual Lock
442
Linearity RTA Check Menu
443
Linearity FFT Display
444
Manual Lock
446
Automatic Lock
446
Linearity FFT Check Menu
447
Flatness FFT Display
448
THD Display
449
Pulse/Fm Display
451
THD Check Menu
451
Pulse/Fm-A Display
452
Pulse/Fm Check Menu
454
Pulse/Fm-B Display
454
FFT Display
455
Appendix A Serial Port Interface Remote Control
457
Interface Cables
458
Connection to a Computer Using CBL006
459
Daisy Chain Addressing
461
824 Network, Addressing Commands
462
Commands
464
Remote Control Commands (Detailed
465
Mode Commands
465
Read" Commands (Reads out Data Variables
466
Any Data" Read Commands
481
Other Read Commands
484
Group Read Programming
485
Setting Commands
486
Querying Settings
487
Ln Query Commands (SSA
489
Entering Settings
489
Option Settings
489
Numeric Settings
491
Character String Settings
491
Template Settings
492
Setting List
493
Histogram Reports
500
Tailored Report
501
Miscellaneous
501
Error Checking I/O
504
RTA Settings Commands
507
History Records
510
Types of History
511
Advance
511
Backup
512
Find
512
History Data Variables
513
Exceedance History Variables
513
Interval History Variables ("I" Commands
515
Daily History Variables - (D1-D102
520
Run Log Variables (SSA, ISM, LOG, tal
521
Calibration History Variables (LOG
522
Time History Variables (SSA, LOG, tal
523
Histogram Table Variables
524
Print Command
525
Error Messages and Warnings
527
Modem Control Mode (All Instruments
530
Modem Mode
530
Dial out Mode
530
Monitor Number
531
824 Phone Dialing Procedure
531
Model 824 Answering Procedure
532
Unsupported Miscellaneous Commands
534
Data File Commands
535
Keyboard Simulation
536
Operation Notes
537
Appendix B Integrated Level Calculations
539
Technical Specifications
547
Appendix C Technical Specifications
548
Declaration of Conformity
548
General Specifications
549
1/1 and 1/3 Octave Filters
566
Filter Shapes
566
Frequency Response
570
Power/Current Draw of 824 Using External Power
595
Appendix D Glossary
597
Average Sound Level (Lavg
597
Community Noise Equivalent Level (CNEL, Lden
598
Criterion Duration (Tc
599
Criterion Sound Exposure (CSE
599
Criterion Sound Level (Lc
599
Daily Personal Noise Exposure Lep,D
599
Day-Night Average Sound Level (DNL, Ldn
599
Decibel (Db)
600
Department of Defense Level (LDOD
604
Dose
604
Detector
604
Eight Hour Time-Weighted Average Sound Level (L TWA(8
604
Energy Equivalent Sound Level (Leq
604
Exchange Rate (Q), Exchange Rate Factor (Q), Exposure Factor (K
604
Far Field
605
Frequency (Hz, Rad/Sec
605
Frequency Band Pass Filter
606
Frequency Filter - Weighted
606
Leq
608
Level (Db
608
Measurement Duration (T
608
Microphone Guidelines
608
Near Field
611
Noise
611
Noise Dose (D
612
Noise Exposure
613
OSHA Level (LOSHA
613
Projected Noise Dose
613
Single Event Noise Exposure Level (SENEL, LAX
613
Sound
613
Sound Exposure (SE
614
Sound Exposure Level (SEL, LET
614
Sound Pressure
615
Sound Pressure Level (SPL, Lp
616
Sound Power(W
617
Sound Power Level (PWL, Lw
617
Sound Speed, (C
618
Spectrum (Frequency Spectrum
618
Threshold Sound Level (Lt
618
Time Weighted Average Sound Level (TWA, LTWA(TC
618
Time Weighting
619
Wavelength (L
619
Wavenumber (K
619
Appendix E Memory Usage
621
LOG Memory Usage
621
Interval Records (Intv History Enabled
622
Daily Records (Daily History Enabled
622
Time History Records (Time History Enabled
622
Other Histories and Memory Usage
622
Estimating Memory Usage
623
824-LOG Memory Usage Worksheet
625
824-SSA Memory Usage
627
Interval Records (Intv History Enabled
627
Time History Records (Time History Enabled
628
Appendix F SLM Testing to IEC61672-1
631
Reference Sound Pressure Level
631
Reference Level Range
631
Microphone Reference Point
631
Average Frequency Response Corrections
632
Periodic Testing of A-Weighted Sound Levels
634
A-Weighted Sound Levels at Upper and Lower Limits of the Linear Operating Range
635
Electrical Signal Input Device
635
Inherent Noise
635
Maximum Sound Pressure Level
636
Power Supply Voltage Range
636
Display Device
636
Stabilization Time Following Changes of Environmental Conditions
636
Electric Field Strength above 10 V/M
636
Greatest Radio Frequency Emission Levels
636
Effect of Electrostatic Discharges
637
Greatest Susceptibility to AC Power and Radio Frequency Fields
637
Appendix G Miscellaneous Information
639
4
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Larson Davis 824 Specifications
General
Brand
Larson Davis
Model
824
Category
Measuring Instruments
Language
English
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