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Larson Davis System 824 User Manual
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C-34
824 Ref
erence Man
ual
9/13/00
Graph 18
- 824 in the YZ plane fitted with the 2541 micro-
phone @ 4 kHz
Graph 19
- 824 in the YZ plane fitted with the 2541 micro-
phone @ 8 kHz
501
503
Table of Contents
Default Chapter
5
Table of Contents
5
Chapter 1 Introduction
19
About this Manual
19
About this Chapter
21
Formatting Conventions
21
Features
22
System 824 Components
25
System Diagram
28
Getting Started
28
Unpacking and Inspection
30
Accessories and Optional Equipment
30
Connecting Internal or External Power
31
Using the Nimh Battery Pack
32
Using Alkaline Batteries
32
Using the AC Power Adapter
33
Chapter 2 Overview
35
System 824 Setups or Instrument Definitions
35
Instrument Definition (ID) Types
36
Slm&Rta (Ssa)
36
Slm (Ism)
38
Logging (LOG)
38
Selecting a Measurement Setup
39
Performing a Measurement; SLM&RTA (SSA) Example
40
Stop, Pause and Back Erase Functions
41
Stopping and Starting Measurements
41
Pausing Measurements
41
Back Erasing
42
Changing the Detector of the Displayed SPL Value
42
Changing the Frequency Weighting of the Displayed SPL Value
43
Changing the Displayed Secondary Parameter
43
Changing the Frequency Weighting of the Displayed Lpeak Value
44
Changing the Amplitude Range, or Input Gain
44
Views
45
Selecting a VIEW
45
Data Storage and Recall
47
Storing Data
47
Recalling Data
47
Calibration
48
Chapter 3 Front Panel Keys; Their Functions and Menus
51
Power Key
53
Power-Up the Instrument / Viewing PWR Display
54
Power Settings
56
Extra Notes on Power Conservation
58
Run/Stop Key
59
Reset Key
59
Pause Key
60
Pause
60
Pause, Back Erase
60
Preview
61
Arrow Keys
61
Check Key
62
View Key
62
Data Key
63
Setup Key
64
Save ID
66
Title
66
ID Name
66
Write Protect, Delete, Write Enable Ids
66
Tools Key
67
About
69
Calibration
72
Clock/Timer
73
Memory
77
Deleting Stored Data
78
Delete Last Function
78
824 Memory Structure
79
Deleting the Last Stored Record
79
Deleting Individual Records
81
Power Monitor
82
Communication
83
Print Key
86
Chapter 4 Quick Start
89
Turning on and Calibrating the System 824
89
Taking Measurements and Storing Data
91
SLM&RTA Measurements
91
Viewing RTA Displays During a Measurement
94
Recalling Stored Data
96
Selecting and Modifying Instrument Definitions (Ids)
98
The Setup Menu
99
The Active ID
99
Menu Scrolling
100
Permanent Ids
101
Write-Protected Ids
101
Preparing for a Measurement
102
Selecting a Different ID
102
Accessing the Settings Menu
102
Accessing the Settings Menu to Initiate Editing or Modification
104
Setting Control in the SLM View
107
Chapter 5 System 824 Virtual Instruments
109
System 824 Virtual Instruments
109
Selecting an Instrument ID
111
Combined SLM&RTA
111
SSA Measuring Ranges
112
AC/DC Output
113
Logging SLM
114
Time History
115
Interval History
115
Exceedances
115
LN Percentiles (Broadband)
116
LN Percentiles (Spectral)
116
Sound Exposure
117
LOG and ISM Measuring Ranges
117
Chapter 6 System 824 Views
119
Status Icons and Indicators
120
General Views
122
SLM Views
122
Any Data View
125
Any Level Format
125
Any Time Format
125
Any Impulse Format
126
SSA Specific Views
127
SSA Displays
129
RTA Displays
129
Tabular RTA Views
129
Time History Displays
130
SSA Time History
134
Run Log
137
Ln Centiles
137
Logging SLM Specific Views
141
Current SLM and Overall SLM Views
143
Current Slm/Overall SLM Display-A (SPL)
144
Current/Overall SLM Display-B (Times)
146
Current/Overall SLM Display-C (Min/Max)
147
Current/Overall SLM Display-D (Peaks)
147
Current/Overall SLM Display-E (TWA)
148
Exposure Views
149
Exposure Display-A
149
Exposure-B Display
151
Exposure-C Display
152
Ln Centiles Views
153
Ln-A Display
153
Ln-B Display
154
Stats Views
155
Stats-A Display
155
Stats-B Display
156
Stats-C Display
157
Run Log (LOG & SSA)
158
Time History
159
Intervals
161
Intervals-A Display
161
Intervals-B Display
162
Intervals-C Display
164
Intervals-D Display
165
Intervals-E Display
166
Exceedance History
167
Excd-A Display
167
Excd-B Display
168
Excd Time History Display
169
Daily Views
171
Daily-A Display
171
Daily-B Display
173
Hourly Leq Display
174
Metrics
175
Metrics-A Display
175
Metrics-B Display
176
Passby
177
Chapter 7 Using ID Setting Files
181
Recalling ID Setting Files
181
Customizing Settings
182
Settings Example - SLM&RTA (SSA)
182
Settings Descriptions
184
Common SLM Settings
185
Title Setting - (SSA, LOG, ISM)
185
Detector Setting - (SSA, LOG, ISM)
185
Weighting Setting - (SSA, LOG, ISM)
186
Gain Setting - (SSA)
186
Range Setting - (LOG, ISM)
186
Transducer Setting - (SSA, LOG, ISM)
187
Random Incidence Microphone Correction
188
Pk Weighting - (SSA, LOG, ISM)
188
RTA Detector Setting - (SSA)
188
RTA Weighting - (SSA)
189
Bandwidth Setting - (SSA)
189
Common Control Settings
189
AC/DC Output Settings - (SSA, LOG, ISM)
191
Logic Input Setting - (SSA, LOG, ISM)
191
Logic Output Time Setting - (SSA, LOG, ISM)
193
Logic Output #2
194
Logic Output #2 Time Setting
194
Heater on
194
E. A. Cal Tone
194
Logging SLM TWA Settings
195
Ovll Exchange - (LOG)
195
Ovll Threshold - (LOG)
196
Ovll Criterion - (LOG)
196
Criterion Time - (LOG)
197
Crnt Exchange - (SSA, ISM, LOG)
197
Crnt Threshold (SSA, ISM, LOG)
198
Crnt Criterion (LOG)
198
LOG and SSA Ln Settings
198
Enable Ln
199
Start Level
199
Spectral Ln's (SSA Only)
200
Ln's
200
LOG and SSA Triggering Settings
201
SPL Excd Lvl 1 - (LOG, SSA)
201
SPL Excd Lvl 2 - (LOG, SSA)
201
PK Excd Lvl 1 - (LOG, SSA)
202
Pk Excd Lvl 2 - (LOG, SSA)
202
Hysteresis - (LOG, SSA)
202
LOG and SSA Time History Settings
203
Hist Enable - (LOG, SSA)
205
Hist Period (LOG, SSA)
205
Period Units - (LOG, SSA)
205
Other Level - (LOG Only)
206
Resolution - (LOG, SSA)
207
Advanced Time History - (LOG, SSA)
207
Marker Text - (LOG, SSA)
208
LOG and SSA Interval Settings
208
Intv Enable - (LOG, SSA)
209
Intv Period - (LOG, SSA)
209
Intv Time Sync - (LOG, SSA)
210
Intv Save Ln's - (LOG, SSA)
210
Intv Auto Stop - (LOG, SSA)
210
Intv Threshold - (LOG, SSA)
211
Intv Exchange - (LOG, SSA)
211
Intv Spectrum - (SSA Only)
212
Logging SLM Exceedance History Settings
212
Triggering - (LOG)
212
Excd Enable - (LOG)
212
Min Duration - (LOG)
212
Excd Time Hist - (LOG)
213
Period - (LOG)
213
Excd Trigger - (LOG)
213
Excd Time - (LOG)
213
Logging SLM Daily History Settings
214
Daily Enable - (LOG)
214
Daily Ln's - (LOG)
214
Logging SLM Define Report Settings
214
Data Report - (LOG, SSA)
215
Setup Report - (LOG, SSA)
215
SPL Histogram - (LOG)
216
Pk-1 Histogram - (LOG)
216
Pk-2 Histogram - (LOG)
216
Intv Report - (LOG, SSA)
216
Hist Report - (LOG, SSA)
217
Menu Layout of SSA Settings
217
Menu Layout of Integrating SLM (ISM) Settings
223
Menu Layout of Logging SLM Settings
226
Check Menus
232
Check Menu Example
233
SLM Check Menu Options (SSA and LOG)
235
Mark Display
235
Graph Menu
237
Settings
237
Controls Settings Menu
238
Other SSA Check Menus
238
Any Data Check Menu
238
RTA Check Menu
239
Intervals Check Menu
240
Time History Check Menu
241
Run Log Check Menu
242
Ln Centiles Check Menus
243
Other Logging (LOG) Check Menus
246
Any Data Check Menu
246
Current SLM / Overall SLM Check Menu
246
Exposure Check Menu
246
LN Centiles Check Menu
247
Stats Check Menu
248
Run Log Check Menu
248
Time History Check Menu
249
Intervals Check Menu
249
Excd History Check Menu
250
Daily History Check Menu
251
Chapter 8 Printing a Report
253
Connecting the 824 to a Serial Printer
253
Printing Reports
254
Defining and Printing Tailored Reports
257
Using the Recall Format (SSA and LOG Instruments Only)
259
Default Settings Values for the Recall Format Reports
260
Printing a Custom Report
274
Chapter 9 Using the 824 Utility Software
279
824 Utility Software Overview
279
824 Utility Installation
279
Starting the 824 Utility Software
280
Connecting the 824 to Your Computer
280
824 Utility Tool Bar
282
824 Utility Setup Window
284
Retrieving Setups from the 824
285
Modifying and Storing Setups to the 824
287
Manipulating a Setup
288
Saving Setups to Disk Files
290
Opening Setup Disk Files
290
Creating a New Setup
292
Renaming an Existing Setup
293
Deleting an Existing Setup
294
Locking and Unlocking Setups
295
Downloading Measurement Data
295
Specifying a Destination File
296
Changing the Download File Name
298
Adding Notes to a Download File
299
Selecting Active Measurements or Data Files
299
Downloading the Measurement
300
Explanation of Files in the 824 Utility Directory
302
Translating Measurement Data from a Downloaded Binary File
303
Selecting a Data Set to View
305
Printing a Translated File
307
Viewing a Translated File Within a Spreadsheet Program
309
Additional Features
310
Chapter 10 RTA (Optional)
315
Settings Menu
316
Settings Descriptions
319
RTA Settings Menu
319
Autostore Settings Menu
321
Arm Settings Menu
322
Trigger Settings Menu
324
End Settings Menu
325
Then Settings Menu
326
Trigger Settings Menu (Continued)
327
RTA Settings
329
RT60-A and RT60-B Instrument Definition
329
Rooms RTA Instrument Definition
331
RTA Views
332
Display Views
332
Trigger Views
336
Autostore Views
338
Autostore Bytime Spectral History
342
Bytime Spectrum Check Menu
343
Bytime Graph Check Menu
344
Rt-60
347
RT60 Check Menu
348
Spatial Avg Views
348
Spatial Avg Check Menu
350
Avg History Check Menu
351
Rooms Views
352
Chapter 11 FFT (Optional)
357
Features
357
Settings Menu
357
Settings Descriptions
359
FFT Display
362
Fft
362
FFT Check Menu
364
THD (Total Harmonic Distortion)
364
Reference Manual
364
THD Check Menu
366
Snapshot Check Menu
367
Entering Linear Units
368
Chapter 12 AUD (Optional)
373
Selecting the 824-AUD Operation Mode
374
SLM+RTA Mode
375
SLM+RTA Live Screen
375
Any Level-A Screen
376
FFT Mode
377
FFT Screen
377
THD (Total Harmonic Distortion)
378
Linearity
381
Pulse/Fm Mode
383
Pulse/Fm-A Screen
383
Pulse/Fm-B Screen
386
Pulse/Fm Check Menu
387
Appendix A Integrated Level Calculations
389
Basic Integrated Level Calculations
389
Appendix B Serial Port Interface Remote Control
399
Interface Cables
400
Connection to a Computer Using CBL006
400
Daisy Chain Addressing
401
824 Network, Addressing Commands
401
Commands
403
Remote Control Commands (Detailed
404
Mode Commands
404
Read" Commands (Reads out Data Variables
405
Any Data" Read Commands
419
Other Read Commands
421
Group Read Programming
421
Setting Commands
422
Querying Settings
423
Ln Query Commands (SSA
424
Entering Settings
424
Option Settings
424
Character String Settings
426
Template Settings
426
Numeric Settings
426
Setting List
427
Histogram Reports
434
Tailored Report
435
Miscellaneous
435
Error Checking I/O
438
RTA Settings Commands
440
History Records
443
Types of History
444
Advance
444
Backup
444
Find
445
History Data Variables
445
Exceedance History Variables
445
Interval History Variables ("I" Commands
447
Daily History Variables - (D1-D102
452
Run Log Variables (SSA, ISM, LOG, tal
454
Calibration History Variables (LOG
454
Time History Variables (SSA, LOG, tal
455
Histogram Table Variables
456
Print Commands
457
Error Messages and Warnings
459
Modem Control Mode (All Instruments
462
Modem Mode
462
Dial out Mode
462
Monitor Number
463
824 Phone Dialing Procedure
463
Model 824 Answering Procedure
464
Unsupported Miscellaneous Commands
465
Data File Commands
466
Keyboard Simulation
467
Operation Notes
468
Appendix C Technical Specifications
469
Declaration of Conformity
470
General Specifications
471
Appendix D Glossary
505
Allowed Exposure Time (Ti
505
Average Sound Level (Lavg
505
Community Noise Equivalent Level (CNEL, Lden
506
Criterion Duration (Tc
506
Criterion Sound Exposure (CSE
506
Criterion Sound Level (Lc
507
Daily Personal Noise Exposure (Lep,D
507
Day-Night Average Sound Level (DNL, Ldn
507
Decibel (Db
507
Department of Defense Level (LDOD
511
Dose
511
Detector
511
Eight Hour Time-Weighted Average Sound Level (L TWA(8
511
Energy Equivalent Sound Level (Leq
511
Exchange Rate (Q), Exchange Rate Factor (Q), Exposure Factor (K
511
Far Field
512
Free Field
512
Frequency (Hz, Rad/Sec
512
Frequency Band Pass Filter
513
Frequency Filter - Weighted
513
Measurement Duration (T
515
Microphone Guidelines
515
Level (Db)
515
Near Field
518
Noise
518
Noise Dose (D
519
Noise Exposure
519
OSHA Level (LOSHA
519
Projected Noise Dose
519
Single Event Noise Exposure Level (SENEL, LAX
519
Sound
520
Sound Exposure (SE
520
Sound Exposure Level (SEL, LET
521
Sound Pressure
521
Sound Pressure Level (SPL, Lp
522
Sound Power(W
523
Sound Power Level (PWL, Lw
524
Sound Speed, (C
524
Spectrum (Frequency Spectrum
524
Threshold Sound Level (Lt
524
Time Weighted Average Sound Level (TWA, LTWA(TC
524
Time Weighting
525
Vibration
525
Wavelength (L
525
Wavenumber (K
525
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Larson Davis System 824 Specifications
General
Brand
Larson Davis
Model
System 824
Category
Measuring Instruments
Language
English
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