Larson Davis System 824 Installationsanleitung

System 824

Training Manual

Larson Davis Inc.

1681 West 820 North

Provo, UT 84601 USA

Phone: 801-375-0177

FAX: 801-375-0182

www.LarsonDavis.com

I824.02 Rev C

824 Training Manual

use without prior written consent of Larson Davis Inc. The manual may not be copied in whole or in

part for any use without prior written consent of Larson Davis Inc.

Disclaimer

The following paragraph does not apply in any state or country where such statements are not agree-

able with local law:

Even though Larson Davis, Inc. has tested the software and reviewed its documentation, Larson Davis

Incorporated makes no warranty or representation, either expressed or implied, with respect to this

software and documentation, its quality, performance, merchantability, or fitness for a particular pur-

pose. This documentation is subject to change without notice, and should not be construed as a com-

mitment or representation by Larson•Davis Inc.

This publication may contain inaccuracies or typographical errors. Larson Davis Inc. will periodically

update the material for inclusion in new editions. Changes and improvements to the information

described in this manual may be made at any time.

Warranty

For warranty information, refer to our Terms and Conditions of Sale on our website,

www.larsondavis.com/TermsConditions.aspx.

Recycling

PCB Piezotronics, Inc. is an environmentally friendly organization and encourages our customers to be

environmentallyconscious. Whenthis product reaches itsend oflife, please recycle the product through

a local recycling center or return the product to:

PCB Piezotronics, Inc.

Attn: Recycling Coordinator

1681 West 820 North

Provo, Utah, USA 84601-1341

where it will be accepted for disposalis manual may be made at any time.

824TrainingManual

iii

Table of Contents

Chapter 1 "Quick Start"

What you will Learn ..........................................................................................1-1

Power



Key Functions....................................................................................1-2

Powering on the 824......................................................................................1-2

Battery Life ...................................................................................................1-2

LCD Screen Backlight ..................................................................................1-3

LCD Screen Contrast ....................................................................................1-3

An Acoustic Chameleon ....................................................................................1-3

Viewing Instrument IDs................................................................................1-4

Navigating the Menus........................................................................................1-5

Arrow Keys...................................................................................................1-7

Check key......................................................................................................1-7

Let’s Push Some Buttons ..............................................................................1-7

SSA Measurements............................................................................................1-8

Time History .................................................................................................1-8

Interval History ...........................................................................................1-10

Broadband Measurements...........................................................................1-11

Lets Go For a Test Drive..................................................................................1-13

SLM.........................................................................................1-13

RTA.........................................................................................1-13

Intervals..................................................................................1-13

Time History...........................................................................1-13

Ln.............................................................................................1-13

Resetting Data .............................................................................................1-17

Calibration...................................................................................................1-17

Taking a Measurement................................................................................1-17

Viewing Data from the 824 Screen..................................................................1-17

SLM Data....................................................................................................1-17

RTA Data ....................................................................................................1-18

Storing Data .....................................................................................................1-18

Recalling Data..................................................................................................1-18

Download Data Using 824 Utility Software....................................................1-19

Downloading the Data.................................................................................1-20

Translating the Data and Looking at the Reports ............................................1-22

Reports (824 Utility Software).........................................................................1-23

824 Training Manual

Printing a Report .........................................................................................1-23

Exporting Data ............................................................................................1-23

Content of Reports ......................................................................................1-23

Summary Report..........................................................................1-23

Time History Report....................................................................1-25

Interval Report.............................................................................1-26

C h a p te r 2 E n v i ro n m e n t a l M e a su r e m e n t s

Environmental Noise ..............................................................................................2-1

Types of Environmental Noise ..........................................................................2-1

Why Measure Community Noise?.....................................................................2-3

824 LOG Instrument...............................................................................................2-4

What Does the LOG Instrument Measure?........................................................2-4

Time History......................................................................................................2-4

Interval History ..................................................................................................2-6

***Special advanced feature.....................................................................2-7

Time synchronization........................................................ 2-7

Exceedance History............................................................................................2-8

Exceedance Time History ...........................................................................2-10

Setting the parameters for an Exceedance History......................................2-11

Excd Enable (Yes) .............................. ...............................2-12

Min Duration (000)........................................................... 2-12

Excd Time-Hist (Yes) ........................................................2-12

T.H. Period (032)................................................................2-12

Excd Trigger (Level) .........................................................2-12

Excd Time (Start)............................................................... 2-12

Viewing Exceedance History Data on the 824............................................2-14

Excd-a...................................................................................2-14

Excd-b .......................................... ........................................2-14

Time History .......................................................................2-15

PassBy Exceedance.....................................................................................2-15

PassBy Measurement ..................................................................................2-16

Daily History....................................................................................................2-16

Explanation of Ldn and CNEL....................................................................2-17

Hourly Statistics..........................................................................................2-17

Hourly Leq...................................... ................................... 2-18

Background Leq ................................................................2-18

Hourly ExcdLeq ................................................................2-18

Metrics .............................................................................................................2-18

DNL (Ldn) ..........................................................................2-19

824TrainingManual

CNEL ..................................................................................2-19

Background Leq ...............................................................2-19

Excd Leq ...................................... ......................................2-19

Chapter 3 RT60 Measurements

What is an RT60 and how is it measured?..............................................................3-1

RT60 Defined................................................................................................3-1

How does my 824 measure an RT60?...........................................................3-2

Taking an RT60 Measurement...........................................................................3-3

Exciting the Room.........................................................................................3-3

Setting up the 824 for an RT60 measurement...............................................3-3

RT60-A and RT60-B Setups............................................. 3-3

Advanced RT60 Measurements.........................................................................3-7

Triggering......................................................................................................3-7

Customizing the Trigger Menu .....................................................................3-9

Averaging............................................................................ 3-9

End Time ............................................................................3-10

Trigger and Arm Levels...................................................3-10

Autostore Display .............................. ..............................3-10

824 Training Manual

4/19/01 824 “Quick Start” 1-1

CHAPTER

824 “Quick Start”

The 824 sound level meter and real-time analyzer is the cul-

mination of four years of research and development. It

advances the state-of-the-art in acoustic instrumentation.

This Training Manual has been developed to jump-start your

initiation into the use of your new instrument. Consider it a

“getting started” guide as you get to know your 824.

What you will Learn

This manual is best used accompanied with the instrument

and 824 Reference Manual. You will be guided through a

step by step tour of the System 824.

After reading this chapter you should be able to do the fol-

lowing:

• Power on the 824

• Navigate through the different menus

• Setup the 824 for a simple measurement

• Take a simple measurement

• Store data

• View data from the 824 screen

• Download data using 824 Utility software

• Look at reports generated by the 824 Utility software

1-2 824Training Manual 4/19/01

Power







Key Functions

Powering on the 824 Turn the 824 on by pressing the On/Off







key .

The instrument will go through a brief start up cycle, where

it flashes the 824 ID screen.

It will then switch to the display that was established before

it was powered off in its previous session. The On/Off







key can also be used to check the battery power, as well as

verify the on/off status of the display’s backlight. Press the

On/Off







key again to view the PWR screen:

Battery Life Battery life is expressed in a percentage (100% being fully

charged). If you are powering the 824 with an external

source (such as the AC/DC adaptor), the voltage level will

be shown.







4/19/01 824 “Quick Start” 1-3

LCD Screen Backlight You can toggle the screen’s backlight on and off by pressing

the right arrow key



LCD Screen Contrast The screen contrast can be adjusted by continuous presses of





. Contrast is expressed as a number between 0

and 100. You will find a value between 64 and 70 to be opti-

mal.

Press



to exit the PWR screen

An Acoustic Chameleon

*Even if you didn’t purchase some of

the options, demo versions are pro-

vided of all of the optional virtual

instruments.

The 824 is a quick-change artist and can be configured many

different ways. Depending on the options* that you pur-

chased the 824 could have the following instruments:

• ISM - Integrating sound level meter

• SSA - Sound spectrum analyzer

• LOG - Logging sound level meter

• RTA - Real-time analyzer

• FFT - Fast Fourier transform analyzer

• AUD - Audiometer calibration system

• TAL - Tonality analyzer

1-4 824Training Manual 4/19/01

Each of these instruments are available from the Setup



menu.

Viewing Instrument IDs Push the Setup



key to view the instruments (virtual

instruments) in your 824.

Integrating sound level meter - Measures Leq, SEL, Min, Max,

Peak, with all weights (A, C, Flat) and with all detectors (Slow, Fast,

Impulse) simultaneously. Includes a high and low measuring range.

Sound spectrum analyzer - This SLM and RTA measures Leq,

SEL, Min, Max, Peak, with all weights (A, C, Flat) and with all detec-

tors (Slow, Fast, Impulse) simultaneously, plus 1/1 and 1/3 octave data

stored in a time history at storage rates as fast as 8 times per second.

Included are Ln data showing six Ln values, a graph of L1 through L99

(broadband) and six spectral Lns.

Logging - Measures Leq, SEL TWA, Min, Max, Peak, with all

weights (A, C, Flat) and with all detectors (Slow, Fast, Impulse) simul-

taneously. Includes time history, interval history, exceedance history,

daily history, Ln percentiles, statistical data, exposure, and dual SLM

(current and overall).

Real-time analyzer - High speed spectral data gathering of up to

400 spectra per second using Autostore function. Spatial averaging of

any number of spectra. Flexible triggering for data acquisition. Per-

forms RT60, RC, NCB, HTL. Exponential and linear detectors.

Fast Fourier Transform - 400 line FFT with Hanning or Rectangu-

lar window, snapshot data storage, display zoom with a factor of 2, 4,

or 8. Count averaging (1 to 16384), measures THD, and linear units

can be user defined.

Audiometer - Audiometer testing for level, frequency, linearity,

THD, pulse, crosstalk, frequency modulation, narrow band, broad-

band, and speech noise.

Tonality analyzer - Performs complex tonality calculations required

by DIN 45681. Measures the frequency of a dominant tone (FT), the

level of the tone (LT), the bandwidth of the tonal group (∆F), the level

of the group (LG), and difference of the two levels (LT- LG). SLM

measures LA, LC, LAeq, LCeq, LAmax, LCmax, LAFTM5, L95, and LCeq-LAeq. A

snapshot history is provided to store and display data from the various

modes.



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