Audio Control SA-3051 Manuale utente

SA-3051 and SA-3052

Spectrum Analyzer

One-Third-OcTave real Time analyzer

WiTh memOries and digiTal sPl disPlay

Operation Manual

22410 70th Avenue West • Mountlake Terrace, WA 98043 • Phone 425-775-8461 Fax 425-778-3166

www.audiocontrol.com P/N 9130430

SA-3051/SA-3052 Operation Manual

About This Manual .............................................................. i

Notational Conventions ....................................................... i

Notes, Cautions, and Warnings ............................................ i

Chapter 1 Introduction

Test Instruments vs. Toys................................................. 1-1

ANSI Filter Design .......................................................... 1-2

Applications ..................................................................... 1-3

Accessory Information..................................................... 1-3

Chapter 2 SA-3051/SA-3052 Front and Rear Panel Features

Front Panel ....................................................................... 2-1

Rear Panel ........................................................................ 2-4

Chapter 3 Operation

Quick-Start Information................................................... 3-1

Using The SA-3051/SA-3052's Functions....................... 3-1

Storing a Response Curve................................................ 3-1

Recalling a Response Curve ............................................ 3-1

Averaging Several Readings ............................................ 3-2

Peak-Hold ........................................................................ 3-2

Peak-Hold Digital SPL..................................................... 3-2

Exercising Your Options .................................................. 3-2

Printer Operation.............................................................. 3-2

Printers Supported............................................................ 3-2

Connector Pin Designations............................................. 3-4

Battery Operation............................................................. 3-4

A and C Weighted Measurements .................................... 3-5

Getting extreme at 175dB SPL ........................................ 3-6

Chapter 4 Acoustical Testing with the SA-3051/SA-3052

Overview.......................................................................... 4-1

Basic Procedure ............................................................... 4-2

Body Effects..................................................................... 4-3

Sound Pressure Level and Hearing Loss ......................... 4-3

Chapter 5 SA-3051/SA-3052 Applications

Sound System Equalization ............................................. 5-1

Hi-Fi Equalization............................................................ 5-1

Multi-Channel/THX Equalization ................................... 5-2

Sound System Equalization ............................................. 5-4

Monitor Speaker Equalization ......................................... 5-4

Fold Back Monitor Equalization...................................... 5-5

Feedback tuning ............................................................... 5-5

Pink noise equalization and feedback tuning................... 5-5

Component Checkout....................................................... 5-6

Tape Machine Alignment ................................................. 5-8

Sound and Music Monitoring .......................................... 5-8

Crossover Testing............................................................. 5-9

Chapter 6 Theory of Operation

Input Circuitry ................................................................. 6-1

One-Third Octave Filters ................................................. 6-1

Signal Multiplexing and Analog to Digital Conversion .. 6-1

Microprocessor Circuitry ................................................. 6-2

LED Display .................................................................... 6-2

Pink Noise Generator....................................................... 6-2

Chapter 7 Warranty

Legalese .......................................................................... 7-1

Service Information ......................................................... 7-2

Chapter 8 Specications

Table of Contents

SA-3051/SA-3052 Operation Manual

About This Manual

This manual describes the AudioControl Industrial SA-3051/SA-3052 and a few of its audio applications.

The manual is divided into several major sections.

Section 1. Introduction is an introduction to the SA-3051/SA-3052 and to this manual.

Section 2. SA-3051/SA-3052 Front and Rear Panel Features describes the physical features found on

the front and rear panels of the SA-3051/SA-3052.

Section 3. Operation describes how to use the various functions of the SA-3051/SA-3052

Section 4. Acoustical Testing with the SA-3051/SA-3052 has procedures for using the SA-3051/SA-3052

for sound system equalization and analysis.

Section 5. SA-3051/SA-3052 Applications describes a few other applications for the SA-3051/SA-3052

besides equalizing sound systems.

Section 6. Theory of Operation, for terminally curious technoids only, is a description of what goes on

  insidetheconnesofthebox.

Section 7. Warranty Information describes the SA-3051/SA-3052 warranty and tells how to obtain

service for the SA-3051/SA-3052. We trust that you'll never need to use this section.

Section 8. SpecicationsliststheSA-3051/SA-3052'sspecications.

Notational Conventions

Within this manual, several different notation conventions are used to indicate various facets of the

SA-3051/SA-3052's features.

Small CapS Indicate a marked feature on the unit, like the control or the connector. They are

also used within procedures to identify controls and switches by function.

Italics and boldface Are used for emphasis. Words printed in boldface convey more emphasis than

those printed in italics.

Notes, Cautions, and Warnings

Some of the text in this manual is set apart by the headings: Note, Caution, or Warning.

These terms are used to denote varying degrees of awareness required by the user during installation,

operation, or maintenance of the SA-3051/SA-3052.

NOTE conveys information that may be helpful to the user. A note is similar to an aside

during a conversation.

CAUTION indicates a potential danger to the instrument.

WARNING indicates a potential hazard to the operator.

About this Manual

SA-3051/SA-3052 Operation Manual

Introduction

Congratulations on purchasing one of the world's most popular audio analyzers. The AudioControl Indus-

trial SA-3051/SA-3052 is an affordable, measurement-grade, one-third octave real-time analyzer de-

signed for audio signal analysis. Previous analyzer designs were either too costly for the average profes-

sional or too inaccurate for serious use. The SA-3051/SA-3052 overcomes these inadequacies by combin-

ing a state-of-the-art microprocessor-based design with modern electronic manufacturing techniques. The

result is a very accurate, quick and easy to use instrument, self contained in one box.

The SA-3051/SA-3052 includes the following features:

 •30one-thirdoctavebandwidthlters

 •Fourth-orderltersconformtoANSIS1.11-1986standards

• Laboratory-grade calibrated measurement microphone

• Internal digital pink noise source

• 32 dB display window

• 9 x 30 large-format LED display matrix

• Full-screen digital SPL readout with 1/10th dB resolution

• Six non-volatile memories with lithium battery backup

• Frequency response averaging for up to six stored response curves

• 20 second temporal averaging

• Peak-hold

• Balanced XLR microphone, balanced TRS ¼" phone jack and unbalanced RCA connector inputs

• 175dB sound pressure level measurement (optional)

 •A-andC-weightinglter(optional)

• Portable battery operation (SA-3052)

• Parallel printer port (SA-3052)

Test Instruments vs. Toys

There is a fundamental difference between the many real-time analyzers currently available on the market

today. That difference is one of calibration. An instrument that is calibrated is capable of making mea-

surements based on some absolute reference (absolute measurement).

An instrument that isn't calibrated can only make comparisons against a relative reference (relative

measurement). For example, someone asks you, "How hot is it today?" If you step outside for a moment

and reply, "Oh, a bit hotter than yesterday," that's a relative measurement. On the other hand, if you step

outsideandconsultacertiedlaboratorythermometerandsay"85degreesF,"you'vemadeameasure-

ment against an absolute reference.

TheSA-3051/SA-3052wascalibratedatthefactorytomeetorexceeditspublishedspecications.You

can make a measurement with the SA-3051/SA-3052 and compare it with a measurement made by any

other measurement-grade instrument and know that you are comparing apples with apples.

1-1

SA-3051/SA-3052 Operation Manual

ANSI Filter Design

A real-time analyzer works by dividing the audio spectrum up into equal bandwidth parts using a set of

calibrated(usually)bandpasslters.Thentheoutputofeachlterisdisplayedonsomesortoflevelindi-

cator: LED matrix, Video display, LCD, etc.

The American National Standards Institute (ANSI) oversees the establishment and maintenance of vari-

ous engineering standards in conjunction with the International Standards Organization (ISO) in Europe.

Thesetwostandardsorganizationshaveestablishedstandardsfortheperformanceofthebandpasslters

used for acoustical measurement purposes.

Forone-thirdoctaveanalyzers,therearetwoclassesofltersallowedbyANSI.TheseareClassII,and

ClassIII.ClassIisreservedforoctavebandwidthanalyzers.ClassIIIltersarethehardesttodesign

and manufacture and are usually only found on the most expensive (read unaffordable) analyzers. Class

IIlters,areeasier(noteasy,justeasier)todesignandmanufacturethanClassIIIlters.Anyreal-time

analyzerintendedforseriousmeasurementworkwilluseltersthatatleastmeetClassIIstandards.

TheltersusedintheSA-3051/SA-3052analyzermeetorexceedthestandardsspeciedbyANSIfora

ClassII,TypeElterset.

Figures1.1and1.2showtwodifferentone-thirdoctavelters.Figure1.1isrepresentativeofthosefound

inmostlower-costanalyzers.Figure1.2isanactuallterusedintheSA-3051/SA-3052.Notethedif-

ferenceintheresponseawayfromthecenterfrequency.Theinferiorlter'sbroadresponsecharacteristic

translates to potential measurement errors at frequencies removed from the band-center and undesirable

interaction between adjacent frequency bands.

Figure 1.1. A non-measurement quality one-third octave lter

Figure 1.2. A measurement quality one-third octave lter

1-2

Applications

The SA-3051/SA-3052 is well-suited to many audio applications including but not limited to:

• Acoustical analysis for sound reinforcement or recording studios

• Movie theater system setup and projector alignment

 •Fastfrequencyresponsemeasurementsonampliers,taperecorders,equalizers,etc.

• Tape recorder setup

• Industrial noise measurement

Accessory Information

Model Description

RM-10 Heavy steel 19-inch rack mount adapter. Requires 3 rack spaces (5.25 inches)

BP-10 Rechargeable internal battery system (SA-3052)

PI-10 PC compatible, parallel printer output port (SA-3052)

CP-10 Adds owner’s name to PI-10 printout

SPL-175 175 dB SPL measurement upgrade

 AC-10  Plug-inA-andC-weightinglter

SC-10 Soft carrying case. Includes space for analyzer, mike and cables (SA-3052)

Note: The SPL-175, BP-10, PI-10, and CP-10 options must be installed by the factory.

BP-10 Rechargeable Internal Battery Pack

The rechargeable battery option allows the SA-3052 to be used independent of AC mains power. The

batteries install within the instrument and provide up to 4 hours of operation on a full charge.

The batteries are recharged by plugging the instrument into a source of AC mains power and leaving

the front panel Power switch set to off for a period of 9 to 10 hours.

PI-10 Printer Output

The printer output option provides a Centronics parallel interface for a PC compatible printer (not pro-

vided). The analyzer-to-printer cable is a standard PC-type parallel printer cable (also not provided).

The printed output is a form with suitable blank spaces for recording the time and place of the mea-

surement and other data, followed by the a printed representation of the real-time spectrum display on

the analyzer.

CP-10 Customized Printout

The CP-10 option customizes the printer output form to include six lines of data for your business

name, address, and other data. Since this data is onlyfactoryinstalled,ithastheadditionalbenetof

“branding” your analyzer in case someone wanders off with your prize analyzer. You must have the

PI-10 printer option installed before you can add the CP-10.

SC-10 Soft Carrying Case

The soft carrying case protects the SA-3052 from the ravages of portable operation. It includes a large

pocket to carry the mike and cables. There is also a hatch on the bottom of the case to allow access to

the power cord connection.

AC-10 A- and C-weighting Filter

TheAC-10A/Cweightinglterisacompactplug-inmoduledesignedtobeinsertedinlinewiththe

microphone. The AC-10 applies the standard A- or C-weighting function to the microphone signal.

SPL-175 High SPL option

The SPL-175 option allows sound pressure level measurements up to 175dB. The SPL-175 includes a

high SPL microphone and software upgrades.

1-3

Introduction

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