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ATS-2 Getting Started.vp

1. 28 Quick Launch 28 Using Files with 5 28 TESCGEIESE D LT 28 MAaGEO FIIGS 3s eed qubd ere Bd S qoum eS 29 D ta Files es deme ferc e deed Gee God 29 Waveform 50 Getting Started with ATS 2 LOG FIE suas ew oe aa E RU eS 30 Downloadable Filter Files ln 30 Chapter 5 Quick 31 Introduction s s s a ose eh ede S Rs PRORA vx S 31 Quick Guide to the Analog Signal Path 31 31 Analog 31 Analyzer Panel len 32 signal Monitor 33 Controlling the Analog Generator 33 UMIC oe eae eee os 34 Quick Guide to 5 35 Sweep Fundamentals 36 Settings and Readings 36 Source Range Steps andSpacing 37 Data 0 37 Example Sweep Frequency Response 38 REVIEW uo ke ed cee V BGR dew d Gow OR Hee S 38 Example Sweep Amplitude Linearity 39 Quick Guide to the FFT Spectrum Analyzer 40 Real Time vs Batch Mode Instruments 40 The FFTConcept
2. Analog Signal Generator Waveforms Sine Family Normal Var Phase Stereo Dual Shaped Burst EQ IMD SMPTE DIN 4 1 1 1 Square Noise Arbitrary Waveform Multitone Special Polarity Pass Thru Sine Family Characteristics Frequency Range 2 Hz 61 6 kHz SR 131 072 kS s Frequency Resolution 0 015625 Hz Flatness 500 Hz ref 20 Hz to 20 kHz 0 01 dB 10 Hz to 50 kHz 0 06 0 1 dB THD N 20 Hz 20 kHz lt 0 0009 101 dB 1 6 pV Variable Phase Range 180 00 to 179 99 deg Dual Sine Ratio Range 0 dB to gt 100 dB Shaped Burst Envelope Raised cosine Burst Interval 2 to 65536 cycles max number of cycles may be limited at low frequencies Burst On Time 1 to number of interval cycles minus 1 1 Significant alias products may appear for frequency settings above 53 5 kHz System specification including contributions from both generator and analyzer 20 kHz measurement bandwidth NP0020 0002 003 Getting Started with ATS 2 45 Chapter 6 Specifications Other Waveforms Arbitrary Waveform Multitone Sample Rates SR 65 536 kS s 131 072 kS s OSR programmed output rate or ISR selected input sample rate Length 256 to 16384 points per channel Frequency Range DC to 0 47xSR Frequency Resolution Sample Rate Length Maximum Number of Tones Length 2 minus 1 8191 with Length 16384 IMD Test Signal SMPTE DIN LF Tone Range 40 Hz to 500 Hz HF Tone Range 2 kHz to 60 kHz Mix Rat
3. Pre Emphasis Filters Applies to all waveforms Filter Shapes 50 15 us or J17 Response Accuracy 0 02 dB 10 Hz to 0 45x SR Residual Distortion 0 00003 130 dB Digital Signal Generator Outputs Formats Balanced XLR AES3 per AES3 1997 Unbalanced BNC SPDIF EIAJ per IEC 60958 Optical Toslink amp per IEC 60958 3 Digital Output Characteristics Sample Rate Range 28 8 kHz to 108 kHz per connector Sample Rate Accuracy 0 0002 ls PPM internal reference lockable to external reference Word Width 8 to 24 bits Output Impedance Balanced XLR Nominally 110 Q Unbalanced BNC Nominally 75 Q Output Amplitude balanced into 110 Range 0 to 5 10 Vpp Resolution 20 mV Accuracy 10 60 mV Output Amplitude unbalanced into 75 Q Range 0 to 1 275 Vpp Resolution 5mV Accuracy 8 15 mV Output Amplitude Optical Toslink amp Nominal intensity not variable Channel Status Bits Full implementation per IEC 60958 English language decoded common to both channels Formats Professional or consumer or Direct Hex source User Bits Set to 0 Validity Flag Selectable set or cleared common to both channels Jitter Generator Waveform Sine Frequency Range 20 Hz to 200 kHz 0 1 Hz resolution Amplitude Range 0 05 to 0 1275 UI in 0 0005 UI steps 0 130 to 1 275 UI in 0 005 UI steps 1 30 to 12 75 UI in 0 05 UI steps Accuracy 500 Hz 10 2 ns Getting Started with ATS 2 49 Chapter 6 Specifications Flatness 1 dB
4. Trigger Output Voltage Range Output Impedance Source 5 V TTL compatible CMOS 0 5 V to 5 5 V 20 kQ pull up to 5 V 5 V TTL compatible CMOS 0to5V 0 5 V to 30V 1 25 V 0 5V 250kQ 5 kQ maximum 0 5 V nominal 150 Q nominal Analog Generator Digital Generator Jitter Generator External Trigger Input Line Mains Channel A Receive Sub Frame Channel B Receive Sub Frame Channel A Receive Sub Frame De jittered Channel B Receive Sub Frame De jittered Receive Block Receive Error Channel A Transmit Sub Frame Channel B Transmit Sub Frame Channel A Transmit Sub Frame De jittered Channel B Transmit Sub Frame De jittered Transmit Block Channel A Sync Ref Receive Sub Frame Channel B Sync Ref Receive Sub Frame Sync Ref Receive Block Sync Ref Receive Error General Environmental Power Requirements Temperature Range Operating Storage Humidity 100 120 230 240 Vac 1096 6 50 60 Hz 75 VA max 5 C to 45 C 40 C to 75 C 90 RH to 40 C non condensing 56 Getting Started with ATS 2 Chapter 6 Specifications Max Operating Altitude Dimensions Width Height Depth Weight Safety 3000 m Complies with 89 336 EEC CISPR 22 class B and FCC 15 subpart J class B 16 8 inches 42 7 cm 3 0 inches 7 6 cm 14 2 inches 36 1 cm Approximately 16 2 Ibs 7 4 kg unpacked all hardware options installed Complies with 73 23 EEC 93 68 EEC and EN6
5. ee a E Audio precision Getting Started with ATS 2 An Introductory Guide to ATS 2 APIB and GPIB Configurations Copyright 2001 2007 Audio Precision Inc All rights reserved Audio Precision PN 8211 0136 Revision 6 All content in this manual is owned by Audio Precision and is protected by United States and international copyright laws Audio Precision allows its customers to make a limited number of copies of this manual or portions thereof solely for use in connection with the Audio Precision product covered by this manual Audio Precision may revoke this permission to make copies at any time You may not distribute any copies of the manual apart from a transfer of ownership of the Audio Precision product Audio Precision amp System One System Two System Two Cascade System One DSP System Two DSP Dual Domain FASTTEST APWIN ATS and ATS 2 are trademarks of Audio Precision Inc Windows is a trademark of Microsoft Corporation Published by 5750 SW Arctic Drive Beaverton Oregon 97005 503 627 0832 e 1 800 231 7350 precision 22 ap com Printed in the United States of America VII0806142538 Safety Information 2 0205000 V Safety Symbols le vi Disclaimers sano ire ES E Packie ee es bare vi Chapter 1 General Information 1 ATS2 An Overview oos 1 APB zog dE GSex
6. 2 02 0202004 41 SettingupanFFT ce 41 42 Time vs Frequency 42 Quick Sweep 42 Fine Tuning the 43 Saving Loading Tests 44 The Next Step ovo o ER erc ou ee E PES 44 Chapter 6 5 45 Chapter 7 GPIB Configuration 59 Introduction 0 len 59 APIB OFGPIB eee whe eee 59 The GPIB Software Development Process 60 Using both GPIB and APIB for Software Development 62 Establishing GPIB Communication 63 GPIBCONNMECTION d sai ee ee eae quy 63 ATS 2 GPIB Address and 1 0 Mode Switch 65 GPIB SCatuSEDS 2e Sb hee ed kee ug 67 Getting Started with ATS 2 GPIB Program Message Terminators Getting Started with ATS 2 Safety Information Do NOT service or repair this product unless properly qualified Servic ing should be performed only by a qualified technician or an authorized Audio Precision distributor Do NOT defeat the safety ground connection This product is designed to operate only from a 50 60 Hz AC power source 250 V rms maximum with an approved three conductor power cord and safety grounding Loss of the protective grounding connection can result in electrical shock hazard
7. Millie a Learn ATS 2 System HW amp SW i using ATS software System Hardware U l Develop Test 1 Develop Test Procedures with Procedure with GPIB ATS software Automated Testing Integrate HW i Develop Test with GPIB Test 71 SW Procedure with GPIB System bien Figure 23 Recommended GPIB software development process using ATS software While developing tests in ATS refer to the ATS 2 GPIB Programmer s Reference Manual for the equivalent GPIB commands It contains detailed information on every GPIB command for ATS 2 along with general pro gramming information code examples and reference material It is avail able separately from Audio Precision Included with the ATS 2 GPIB Programmer s Reference Manual is a CD ROM containing GPIB sample files The command description sections of the Programmer s Reference Man ual show ATS software control panels for each of the major subsections of ATS 2 Each panel is illustrated with GPIB command call outs to help you convert your ATS software setup to GPIB commands Figure 24 illustrates this for the ATS 2 Analog Generator panel Getting Started with ATS 2 61 Chapter 7 GPIB Configuration The GPIB Software Development Process imi Analyzer zi DSP PROGram DSP DANLr COUPIing DSP DANL
8. The mains power supply is applied to ATS 2 through the power entry module located on the rear panel Before connecting the power cord con firm that the input voltage selection and fusing arrangement in the power entry module are correct for your mains power supply Checking the Mains Supply Voltage Configuration The voltage indicator pin protrudes through one of the four labeled holes in the module cover to indicate the selected input voltage as shown in Figure 2 Check that the indicated voltage matches your mains supply voltage Opening the Power Entry Module Unplug the power cord from the instrument before changing fuses or performing any other operations described in this section To open the Power Entry Module refer to Figure 3 and proceed as fol lows m Remove the mains power supply cord from the power cord connector Figure 3 Power entry module door and fuse block m Locate the slot in the module cover door hinge The hinge is a the left side of the cover door and the slot in the hinge is visible in the power cord connector cavity Insert a small screwdriver or similar tool in the slot and pry the cover door hinge outward The cover door will snap out and then can be pivoted on its hinge for access to the fuse block assembly and voltage selector card 10 Getting Started with ATS 2 Setting Up the ATS 2 Hardware Chapter 2 Installation and Setup for APIB Changing the Mains Supply Voltage Configuration
9. Like many Windows applications the ATS user interface has a menu bar a status bar toolbars and a workspace With these tools you can save test and data files export and print measurement results configure the hardware and software to your needs access online help design and launch automated processes and of course open and operate the instru ment panels where the core test and measurement work is performed The ATS software is a powerful and complex program This chapter pro vides a quick introduction to its features For an in depth discussion refer to the ATS 2 User s Manual A Note on Nomenclature In this chapter we use the following shorthand m Menu gt Item This refers to choosing an item from one of the pull down menus located at the top of the workspace For instance choose Utilities gt Restore means that you select the Utilities pull down menu then click on the Restore item Getting Started with ATS 2 21 Chapter 4 ATS 2 User Interface Starting up the ATS Software Starting up the ATS Software As part of the ATS installation process an ATS icon is placed on the desktop of your PC Click on this icon to start the software If you have an ATS 2 instrument connected and switched on the software will automati cally detect the hardware and initialize it If you do not have hardware connected or it is not switched on the software will prompt you to start demo mode At this point you have
10. from the accessible conductive surfaces of this product For continued fire hazard protection fuses should be replaced ONLY with the exact value and type indicated on the rear panel of the instrument and discussed on page 12 of this manual The AC voltage selector also must be set to the same voltage as the nominal power source voltage 100 120 230 or 240 V rms with the appropriate fuses Different fuses are re quired depending on the line voltage The International Electrotechnical Commission IEC 1010 1 requires that measuring circuit terminals used for voltage or current measurement be marked to indicate their Installation Category The Installation Category is defined by IEC 664 and is based on the amplitude of transient or im pulse voltage that can be expected from the AC power distribution net work This product is classified as INSTALLATION CATEGORY II abbreviated CAT II on the instrument front panel Do NOT substitute parts or make any modifications without the written approval of Audio Precision Doing so may create safety hazards This product is for indoor use pollution degree 2 Getting Started with ATS 2 LES Safety Symbols The following symbols may be marked on the panels or covers of equip ment or modules and are used in this manual WARNING This symbol alerts you to a potentially hazardous condi tion such as the presence of dangerous voltage that could pose a risk of electrical shock Refer
11. individual distortion harmonics can be seen The pattern of harmonics provides insight into the mechanisms responsible for the distortion The FFT process consists of the following steps m Triggering The system waits for a trigger event from the selected source for instance a positive going zero crossing of the analog generator m Acquisition The system stores the input audio in memory until the selected number of audio samples has been received The more audio data acquired the more frequency points there will be in the result and hence the higher the resolution will be However longer acquisitions take more time m Windowing Before transformation the audio data is shaped in time by multiplying it with a pre defined envelope This increases the accuracy of the amplitude values returned from the FFT m Transformation The windowed audio data is transformed by the FFT This results in an array of points describing the magnitude and phase of each frequency in the audio signal m Display ATS fetches the transformed audio data and graphs it Because the number of transformed points is typically larger than the number of points in the graph a peak picking method is used to ensure that peaks in the frequency data are not missed For more information see Appendix C of the ATS 2 User s Manual Setting up an FFT After a New Test ATS defaults to the audio analyzer To switch to the Audo Analyzer i spectrum analyzer click t
12. 3 Hardware Overview POWER CORD CONNECTOR This is a standard grounded connector for the mains power supply cord FUSE HOLDER MAINS SUPPLY VOLTAGE JUMPER Contains the mains power fuse and the mains supply voltage configuration jumper card See Chapter 2 MAINS SUPPLY VOLTAGE INDICATOR The white tip of the plastic indicator on the voltage configuration jumper card appears in one of four small holes to show the mains voltage selection m FUSE REPLACEMENT INFORMATION This chart lists the fuse values required for correct operation at the four supply voltage options m SERIAL NUMBER OPTIONS LABEL The Audio Precision serial number for this ATS 2 chassis and the hardware options if any included in the chassis m MONITOR JACK This is a 3 5 mm jack suitable for driving stereo headphones or other audio monitors m RESERVED FOR GPIB PANEL This blank panel can be removed for factory installation of the GPIB configuration option adding GPIB IEEE 488 2 General Purpose Interface Bus functionality to ATS 2 If your ATS 2 is configured for GPIB see Chapter 7 m SYNC REF IN This connector provides an input for an external digital audio signal a square wave or an NTSC PAL video signal for sample rate synchronization house sync m AUDIO MONITORS The source connectors monitor the signal currently being analyzed The function connectors monitor the function meter in the audio analyzer These signals can also be
13. GenMon Analog Generator Panel In the default configuration the Analog Generator panel is set for a 1 V 1 kHz sine wave but the analog outputs are disabled To turn on Getting Started with ATS 2 31 Chapter 5 Quick Guides Quick Guide to the Analog Signal Path Outputs ero the outputs click the OUTPUTS OFF button near the center of the Cutputs s panel The button will turn green and you will hear relays click in the ATS 2 hardware The peak meters in the analog input panel will show ap proximately 1 414 Vpp The peak meters indicate the presence of signal at the analog inputs The stereo generator outputs can be individually disabled with the CHA and CHB buttons next to the OUTPUTS field Click on the CHB button The button will turn gray relays will click in the hardware and the Channel B peak meter on the analog input panel will indicate a level close to zero Analyzer Panel The default Analyzer panel is a real time audio analyzer It provides continuous readings of signal level and frequency It also allows you to fil ter the audio signal and measure parameters such as total harmonic distor tion phase and so on It is a stereo instrument with the meters on the left of the panel reporting channel A readings and those on the right reporting channel B readings At this point you should have the setup shown in Figure 15 m Analog generator channel A producing a 1 V 1 kHz sine wav
14. Polarity Pass Thru Monotonicity J Test Walking Ones Walking Zeros Constant Value Digital DC Random ehe to SR 6 in even integer sub multiples of 40 Hz to 500 Hz 2 kHz to 0 47 x SR 1 1 or 4 1 LF HF Pseudo Random White Rectangular PDF Bandwidth 0 50x SR Sum of two sinewaves phased for reinforcement with normal polarity Passes the embedded audio signal from the rear panel Sync Ref Input Output Sample Rate OSR must be within the range of 0 334 to 3 000 of the Sync Ref Input sample rate Staircase waveform of lowest 10 levels for D A linearity testing Produces a maximum amount of data induced jitter on low bandwidth transmission links A single binary one value walked from LSB to MSB A single binary zero value walked from LSB to MSB 32 bit resolution when using triangular dither Random binary states of all bits Arbitrary Waveform Multitone Sample Rates SR Length Frequency Range Frequency Resolution Maximum Number of Tones Dither 65 536 kS s 131 072 kS s OSR programmed output rate or ISR selected input sample rate 256 to 16384 points per channel DC to 0 47xSR Sample Rate Length Length 2 minus 1 8191 with Length 16384 Applies to all waveform except Monotonicity J Test Walking Ones Walking Zeros Random Types Amplitude None Triangular Rectangular or Shaped 8 to 24 bit 48 Getting Started with ATS 2 Chapter 6 Specifications
15. Vpp to 45 2 Vpp 770 0 dBu to 26 30 dBu 250 uVrms to 8 00 Vrms 700 uVpp to 22 6 Vpp 70 0 dBu to 20 28 dBu 0 09 dB 1 0 96 0 007 dB or 0 60 Vrms whichever is larger 24 1 dBm Rs 40 Q 18 4 dBm Rs 20 Q Typically gt 50 mA lt 0 25 of Vpp setting 0 7 of Vrms setting lt 100 dB 3 uV 20 Hz to 20 kHz Digital Signal Generator Sine Family pe Var Phase Stereo Dual Shaped Burst Q Burst Offset IMD SMPTE DIN 4 1 1 1 Noise Arbitrary Waveform Multitone Special Polarity Pass Thru Monotonicity J Test Walking Ones Walking Zeros Constant Value Random Common Sine Family Characteristics Frequency Range Frequency Resolution Flatness Harmonics and Spurious Products Variable Phase Range Dual Sine Ratio Range 2 Hz to lt 0 50xSR SR 22 0 001 dB 0 000001 160 dB 180 00 to 179 99 deg 0 dB to gt 100 dB Sine Offset Amplitude Range Sinewave amplitude offset amplitude lt 1 FFS Burst and Shaped Burst Envelope Burst Interval Burst On Time Burst signal envelope is rectangular Shaped Burst envelope is raised cosine 2 to 65536 cycles max number of cycles may be limited at low frequencies 1 to number of interval cycles minus 1 Getting Started with ATS 2 47 Chapter 6 Specifications Squarewave Frequency Range SMPTE DIN Test Signal Lower Tone Range Upper Tone Range Mix Ratio Noise Signal White Special Signals
16. amp 387 3 mv dBr B 387 3 my Freq 1 00000 kHz V FS 1 000 Y watts 8 000 Ohms dBm e00 0 hms A panel can be placed on one or more workspace pages Duplicate panels show the same information Many panels come in two sizes the smaller having the most commonly used fields visible and the larger show ing every option Double click on a panel title bar to expand or contract the panel You can minimize or close a panel without canceling its function or ef fect For example you can set a signal s output voltage and frequency on the generator panel and then close the panel window The signal will con tinue at those settings until you turn the generator OFF Getting Started with ATS 2 23 Chapter 4 ATS 2 User Interface ATS Panels Panel Settings Settings for tests and measurements are made using several different controls on the panels m Setting fields which come in several versions wFST000 v A Windows text box in which you can directly enter a value from the keyboard SMPTE DIN 4 1 H A Windows drop down list box from which you can make a selection of a fixed number of choices SMPTE DIN 1 1 A combination text box with an added drop down list from which 1 000 Vims you can choose the units to express your value Setting fields display black characters on a white field except when an EQ waveform is selected when the generator amplitude fields show blue text Track A m Check boxe
17. computer 62 Getting Started with ATS 2 The GPIB Software Development Process Chapter 7 GPIB Configuration SRQ GPIB 1 ERR 1 wv 0 168421 TA GPIB ee Figure 25 The ATS 2 Option GPIB panel detail shown in GPIB mode To use APIB to control ATS 2 select APIB on the rear panel switch as shown in Figure 26 left most switch clicked up to 1 and connect a ca ble from the APIB interface card on the controlling computer to the port on ATS 2 SRQ APIB GPIB 1 ERR e 1 e wv 0 168421 GPIB eee Figure 26 The ATS 2 Option GPIB panel detail shown in APIB mode Whether controlled by APIB or GPIB ATS 2 still uses APIB to control other Audio Precision APIB instruments and accessories such as the DCX 127 and the SWR 2122 family of switchers Figure 27 illustrates how to connect these devices to the ATS 2 when the GPIB port is the control port Figure 28 illustrates how to connect an APIB controller to this system when the GPIB port is disabled Establishing GPIB Communication GPIB Connection The ATS 2 with Option GPIB installed has a 24 pin GPIB compatible connector on the rear panel This D shell connector conforms to the me chanical requirements of IEEE 488 1 1987 The instrument is connected to the instrument controller via an appropriate cable The instrument control ler a computer must have a corresponding GPIB interface port Standard G
18. for ATS 2 6 Getting Started with ATS 2 Installation and Setup for APIB ATS 2 Components The following items are included with a standard APIB configured ATS 2 For a GPIB configured ATS 2 refer to Chapter 7 m The ATS 2 hardware chassis m A mains power cord m A box containing the ATS 2 WIN KIT interface kit The following items are contained within the ATS 2 WIN KIT m This manual Getting Started with ATS 2 m The ATS 2 User s Manual m An Audio Precision Interface Bus APIB USB adapter or interface card as ordered m The ATS control software CD ROM containing ATS control software for the ATS 2 m An Audio Precision Resources Disc CD ROM containing sample files user documents and other resources m A playable audio compact disc AP CDO containing audio test signals We recommend that you retain the shipping box and packing materials to protect your instrument if you need to ship it in the future Getting Up and Running There are three main tasks to setting up ATS 2 m Installing the ATS software on a personal computer PC Getting Started with ATS 2 7 Chapter 2 Installation and Setup for APIB Installing ATS Software on a PC m Configuring ATS 2 for the local mains power supply and m Connecting the interface using either the USB APIB adapter or by installing an APIB card in the PC These tasks are described below Installing ATS Software on a PC PC System Requirements ATS
19. in progress These readings in clude level and frequency as well as functions such as distortion or phase During a sweep readings from the audio analyzer are diverted from the panel meters to the sweep engine for graphing After the sweep the read ings are once again displayed in the panel meters By contrast the FFT spectrum analyzer is a batch mode instrument It does not generate readings if a sweep is not being performed When a sweep is started the spectrum analyzer first acquires a segment of audio by storing it in memory This is indicated on the Status bar as DSP Acquir ing Data Once the acquisition is complete the spectrum analyzer pro cesses the data This is indicated as DSP Transforming Data on the Status bar Once processing is complete ATS fetches a batch of readings from the spectrum analyzer At that point the data is graphed 40 Getting Started with ATS 2 Quick Guide to the FFT Spectrum Analyzer Chapter 5 Quick Guides The FFT Concept The FFT fast Fourier transform is an efficient way to decompose a pe riodic signal into its component frequencies It transforms a time domain signal such as you might see in an oscilloscope trace into a frequency do main representation As an example a high quality power amplifier fed with a sinusoidal in put will produce harmonic distortion at its output that is invisible in an os cilloscope trace If an FFT is performed on the output signal however the
20. m AP downloadable highpass filter file afh m AP downloadable weighting filter file afw The use of downloadable filters is described in detail in Chapter 10 of the ATS 2 User s Manual 30 Getting Started with ATS 2 Quick Guides Introduction The Quick Guides in this chapter provide a way to get used to the ATS user interface and to get some immediate results from ATS 2 As you be come more familiar with the system please refer to the ATS 2 User s Man ual for further information The Quick Guides begin with the assumption that ATS 2 is turned on and connected to your PC and that the ATS software has been launched and is properly controlling your instrument No cables or external devices are needed for the Quick Guides Quick Guide to the Analog Signal Path When the ATS software is launched the default workspace is loaded with three panels labeled Analog Generator Analog Input and Ana lyzer To return to this configuration at any time click the New Test but ton Previous settings and data will be discarded Analog Input Panel ATS 2 has two channels of analog input Each channel can receive a signal from its front panel XLR connector its front panel BNC connector 7 or via an internal path from the analog generator The Source fields on LA Bal the Analog Input panel present these choices as a drop down list BNC Unbal Choose GenMon for each channel to engage the internal path
21. m Open the Power Entry Module as described above m The voltage selector card is a small circuit board fitted with a white plastic indicator pin installed in a housing on the right side of the Power Entry Module as shown in Figure 4 Pull the voltage selector card straight out of the housing using narrow pliers to grab the card Do not use the indicator pin as a handle Figure 4 Changing the mains power supply voltage m Orient the selector card so that the desired input voltage is readable at the bottom shown in Figure 5 Then move the indicator pin to point UP opposite the indicated voltage Seat the pin assembly in the notch on the board edge m Insert the voltage selector card into the housing with the printed side of the card facing toward the mains power connector The card edge indicating the desired voltage should enter the housing first m Confirm that the correct fuse or fuse combination is installed for the intended input voltage refer to the fuse ratings marked on the 90 230V 90 Figure 5 Voltage selector card positions Getting Started with ATS 2 11 Chapter 2 Installation and Setup for APIB Setting Up the ATS 2 Hardware instrument rear panel If necessary change the fuse type as described in the following section m Close the module the cover door and verify that the indicator pin shows the desired voltage Once you have verified that the line voltage selection is correct connect the po
22. monitored on the internal speaker m TRIG IN This connector provides an input to trigger or initiate certain measurement functions m TRIG OUT This connector provides an output for triggering an external oscilloscope or other equipment m APIB INTERFACE This connector provides the two way Audio Precision Interface Bus connection between ATS 2 and the personal computer running the ATS software m AUXILIARY CONTROL OUT A 9 pin DSUB connector to enable ATS 2 to control other instruments m AUXILIARY CONTROL IN A 9 pin DSUB connector for external control and display input GROUND CONNECTOR This is connected to chassis ground Getting Started with ATS 2 19 Chapter 3 Hardware Overview ATS 2 Rear Panel 20 Getting Started with ATS 2 Chapter 4 ATS 2 User Interface Overview ATS 2 is controlled by the ATS software running on the controller PC via the Audio Precision Interface Bus APIB The hardware is configured through settings in fields on software panels and readings measurements are taken from meters on other panels It is also possible to change settings and collect readings programmatically using the AP Basic language When ordered in the optional GPIB configuration ATS2G ATS 2 can also be controlled by the industry standard IEEE 488 2 General Purpose Interface Bus GPIB GPIB operation is not covered in this chapter See Chapter 7 for more information about the ATS 2 GPIB configuration
23. sample rate the interface waveform voltage the jitter amplitude and the active and inactive data bits ATS 2 also has the capability of transmitting and receiving a full complement of AES EBU status bits m ATS 2 s sample rate may be synchronized to an external AES EBU signal a square wave or an NTSC or PAL video source m ATS has two auxiliary control connectors for control of external equipment Conceptual Architecture of ATS 2 The functional components implemented in ATS 2 include two audio signal generators an audio signal analyzer digital and analog input and output modules and a module for external timebase synchronization All signal generation is performed in the digital domain One of the two signal generators is dedicated to the digital output The signal from this digital generator is buffered and conditioned for the balanced unbalanced and optical outputs The output of the second signal generator is con verted to an analog signal by a digital to analog converter DAC The two channel output of the DAC is conditioned and ranged for the balanced and unbalanced analog outputs All signal analysis is also performed in the digital domain The digital in put is buffered and directly applied to the analyzer Analog inputs are first ranged and conditioned and then digitized by a high resolution ana log to digital converter ADC before being applied to the analyzer An op tional high bandwidth ADC is available to incr
24. setting m Change the Start value for Source 1 to 100 uV ATS understands the prefix to stand for w m Choose the dBg A units for Data 1 by clicking on the arrow next to the Top field and choosing the dBg line from the list The dBg A units decibels relative to generator channel A show the ratio of the reading to the level of the analog generator in dB m Set the Data 1 Top value to 0 1 and the Bottom value to 0 1 Click Go to start the sweep The ranging relays will click as the genera Q Go tor changes amplitude The result will be a curve that deviates only slightly from 0 dBg A as shown in Figure 19 Getting Started with ATS 2 39 Chapter 5 Quick Guides Quick Guide to the FFT Spectrum Analyzer Figure 19 Current workspace afte amplitude linearity sweep showing typical results Quick Guide to the FFT Spectrum Analyzer At the top of the Analyzer panel is a drop down list of the instruments available in ATS Up to this point we have been using the audio analyzer to make measurements We will now take a look at the FFT spectrum ana lyzer This instrument displays audio signals in time oscilloscope style and in frequency spectrum analyzer style It operates in a different fash ion from the audio analyzer as explained next Real Time vs Batch Mode Instruments The audio analyzer is a real time instrument That is it returns readings continuously whether or not a sweep is
25. signal conditioning modules digital signal processors memory and other circuitry needed to perform audio measurements It is connected to the controller PC by the Audio Precision Interface Bus APIB In this chapter the features of the hardware are described For a full list of hardware speci fications see Chapter 6 When ordered in the optional GPIB configuration ATS2G ATS 2 can also be controlled by the industry standard IEEE 488 2 General Purpose Interface Bus GPIB GPIB operation is not covered in this chapter See Chapter 7 for more information about the ATS 2 GPIB configuration All signal generation and analysis is performed in the ATS 2 hardware including storage of signals acquired for DSP waveform display or FFT analysis ATS 2 Front Panel The ATS 2 front panel shown in Figure 11 includes the digital and an alog inputs and outputs and a power indicator Digital Output Digital Input Analog Outputs Analog Inputs Power Indicator Figure 11 ATS 2 front panel Getting Started with ATS 2 17 Chapter 3 Hardware Overview ATS 2 Rear Panel m DIGITAL OUTPUTS In single connector mode ATS 2 transmits stereo digital audio simultaneously on the XLR I connector the BNC connector and the optical connector In dual connector mode channels A and B are transmitted on the XLR I and II connectors respectively m DIGITAL INPUTS In single connector mode ATS 2 receives stereo digital audio from the XL
26. to the accompanying warning label or tag and exer cise extreme caution ATTENTION This symbol alerts you to important operating consider ations or a potential operating condition that could damage equipment If you see this marked on equipment refer to the Operator s Manual or User s Manual for precautionary instructions FUNCTIONAL EARTH TERMINAL A terminal marked with this sym bol is electrically connected to a reference point of a measuring circuit or output and is intended to be earthed for any functional purpose other than safety PROTECTIVE EARTH TERMINAL A terminal marked with this sym bol is bonded to conductive parts of the instrument and is intended to be connected to an external protective earthing system Disclaimer Audio Precision cautions against using their products in a manner not specified by the manufacturer To do otherwise may void any warranties damage equipment or pose a safety risk to personnel vi Getting Started with ATS 2 General Information Asn Figure 1 The Audio Precision ATS 2 audio test and measurement system ATS 2 An Overview The Audio Precision ATS 2 is a powerful computer controlled audio test and measurement system consisting of two key components m The ATS 2 hardware the connectors and circuitry necessary for precise signal generation and analysis and for interfacing to devices The hardware is mounted in a compact 2 U aluminum and steel chassis that c
27. value to the Stop value shown in fields below Source 1 The number of steps in the sweep is shown in the Steps field A radio button to the right of these fields controls whether successive settings are separated linearly or logarithmically In a linear sweep the difference between successive settings is constant In a logarithmic sweep the ratio between successive settings is constant For example if the start frequency is 20 Hz the stop frequency is Log Lin 20 kHz there are 3 steps and the spacing is logarithmic ATS will first set the generator to 20 Hz then 200 Hz then 2 kHz and finally 20 kHz That is the ratio between successive frequency settings is 10 On the other hand if the spacing is linear the generator is first set to C Log Lin 20 Hz then 6680 Hz then 13340 Hz and finally 20 kHz That is the dif ference between successive frequency settings is 6660 Hz Data Display Range A graph is automatically created when a sweep is run The Start and Stop values for Source 1 define the extent of the horizontal x axis The extent of the vertical y axis is determined by the values in the Top and Bottom fields beneath Data 1 The units of the y axis are the same as the units in the Top and Bottom fields If you change the units of the Top or Bottom field the units in the other field will also change See the Units section on page 34 for more in formation on units Getting Started with ATS 2 37 Chapter 5 Qui
28. 0 0025 92 dB lt 0 00003 130 dB at 0 dBFS lt 0 0003 110 dB at 25 dBFS FFT Analyzer Acquisition Length Transform Length 800 to 256 k samples in 11 steps 256 to 32768 samples in binary steps 2 System specification with 60 Hz 7 kHz or 250 Hz 8 kHz test signal combinations and Vin 200 mV 52 Getting Started with ATS 2 Chapter 6 Specifications Windows None None move to bin center Hann Hamming Blackman Harris 4 term 92 dB sidelobes Equiripple AP design with 160 dB sidelobes Flat top Gaussian Rife Vincent 4 term Rife Vincent 5 term Amplitude Accuracy Flat top window Analog 0 10 dB 1 2 Digital 0 001 dB 0 012 Phase Accuracy Analog 0 5 deg 10 Hz to 5 kHz 1 deg 5 kHz to 20 kHz 2 299 20 kHz to 50 kHz with performance option Digital 0 05 deg 10 Hz to 0 45xSR Averaging Number of averages 1 to 4096 in binary steps Algorithm Power based frequency domain Synchronous time domain Display Modes Time Domain Normal Interpolate Peak Absolute Value Frequency Domain Displays highest FFT bin between graph points None Move to Bin Center Window Frequency Range 4 of input frequency 7th FFT bin low limit to 0 45xSR high limit Spurious Products lt 120 dB Residual Distortion Analog lt 105 dB SR 65 kS s lt 90 dB SR 262 kS s with performance option Digital lt 180 dB Analog Alias Rejection Standard High Resolution A D typically gt 115 dB for
29. 0 1 dB ripple 110 dB stopband User defined 6 pole max 7 Both analyzer input channels must have same coupling ac or dc selection Analog accuracy is valid for any input signal amplitude ratio up to 30 dB Getting Started with ATS 2 51 Chapter 6 Specifications High Pass Group Weighting Filter Group lt 10 Hz 4 pole 22 Hz 4 pole Butterworth 100 Hz 4 pole Butterworth 400 Hz 4 pole Butterworth or 10 pole elliptic if no other filters are enabled User defined 4 pole max None ANSI IEC A weighting per IEC 179 IEC 468 CCIR Qpk Dolby 2K CCIR ARM C message per IEEE 743 1978 CCITT per Rec O 41 F weighting per 15 phon loudness contour HI 2 Harmonic weighting User defined 8 pole max Bandpass amp Crosstalk Functions Tuning Range Bandpass Response Accuracy at center frequency Analog Digital Residual Noise Analog 10 Hz to 5 kHz 5 kHz to 20 kHz 20 kHz to 50 kHz Digital SMPTE DIN IMD Function Test Signal Compatibility IMD Measured Measurement Range Accuracy Residual IMD Analog Digital 20 Hz to 0 47xSR 10 pole Q 19 124 dBu 118 dBu 112 dBu NO noon SESS n IA IA IA IA 1 Any combination of 40 Hz to 250 Hz LF and 2 kHz to 0 45xSR HF mixed in any ratio from 1 1 to 5 1 LF HF Amplitude modulation products of the HF tone Measurement bandwidth is typically 20 Hz to 750 Hz 0 to 20 0 5 dB lt
30. 0 mVpp BNC and 3 the analyzer is set for 700 Hz 100 kHz bandwidth 1 kHz ref Flatness derates above 5 kHz by an additional 0 02 dB in the 22 4 V 45 V 90 V and 200 V input ranges 50 Getting Started with ATS 2 Chapter 6 Specifications Accuracy Analog 2 deg 10 Hz to 5 kHz 3 deg 5 kHz to 20 kHz 4 deg 20 kHz to 50 kHz with performance Option Digital 1 deg 10 Hz to 0 45x SR Resolution 0 01 deg Minimum Input both channels Analog 1 mV S N gt 40 dB Digital 60 dBFS S N gt 40 dB Residual Noise Amplitude Function only Analog A weighted lt 1 2 uV rms Dolby 2K lt 2 0 uV rms IEC 468 CCIR lt 6 0 uV Qpk 20 kHz LP lt 1 6 uV rms Digital A weighted lt 142 dBFS Dolby 2K lt 134 dBFS IEC 468 CCIR lt 127 dBFS 20 kHz LP lt 140 dBFS THD N Function Fundamental Range 10 Hz to 0 47 x SR Measurement Range 0 to 10096 Accuracy 0 3 dB 10 Hz to 0 45x SR no filters selected Residual THD N Analog 0 000996 7101 dB 1 6 uV with 20 kHz LP Digital 138 dBFS Minimum Input for Counter Tuning Analog 1 mV S N gt 40 dB Digital 65 dBFS S N 40 dB Notch Tuning Modes Counter Tuned Sweep Track Agen Track Dgen Track or Fixed set by direct entry Amplitude amp THD N Filters One filter from each of the following 3 groups may be enabled for 3 filters total Low Pass Group Fs 2 no BW limiting 20 kHz 6 pole elliptic 0 1 dB ripple 110 dB stopband 15 kHz 6 pole elliptic
31. 100 Hz to 20 kHz Residual Jitter lt 2 ns 0 012 UI at 48 kS s 0 024 UI at 96 kS s Spurious Jitter Products typically 0 003 UI 50 dBUI or 30 dB below jitter signal whichever is larger Audio Analyzer Level and Amplitude Measurement Independent level and amplitude meters per channel Measurement Range Analog 1 uV rms to 140 V rms 7118 dBu to 45 1 dBu Digital 120 dBFS to 0 dBFS usable to 140 dBFS Accuracy 1 kHz Analog 0 09 dB 1 0 Digital 0 002 dB 0 023 Flatness Analog 0 01 dB 20 Hz to 20 kHz 0 45xSR if less 0 10 dB 10 Hz to 120 kHz with performance option Digital 0 002 dB 10 Hz to 0 45x SR Detection RMS FAST RMS or QPK per IEC 468 CCIR Frequency Measurement Two independent meters one per channel Range Analog 10 Hz to 30 kHz SR 65 536 kS s 10 Hz to 120 kHz with performance option Digital 10 Hz to 0 47 x SR Accuracy 0 0002 2 PPM Resolution 0 00001 of SR 0 007 Hz at 65 536 kS s Minimum Input Analog 1 mV S N gt 40 dB Digital 100 dBFS S N gt 40 dB Phase Measurement Measurement Ranges 180 90 to 270 or 0 to 360 deg System specification including contributions from both analyzer and generator Valid at 32 0 44 1 48 0 65 536 88 2 and 96 0 kS s only Flatness may degrade at other sample rates System specification valid only if 1 the jitter generator amplitude is turned off 2 the digital input is 1 0 Vpp XLR or 25
32. 1010 1 Amendment 1 1992 Amendment 2 1995 Installation Category II Pollution Degree 2 CAN CSA C22 2 No 1010 1 92 Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use Part 1 General Requirements Includes Amendment 1 CAN CSA C22 2 No 1010 1B 97 Amendment 2 to CAN CSA C22 2 No 1010 1 92 Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use Part 1 General Requirements UL Std No 3111 1 Equipment for Measurement Use Part I General Requirements T3 Emission and immunity levels are influenced by the shielding performance of the connecting cables EMC compliance was demonstrated using Audio Precision part numbers CAB XMF and CAB AES2 Getting Started with ATS 2 57 Chapter 6 Specifications 58 Getting Started with ATS 2 GPIB Configuration Introduction As an option ATS 2 can be ordered in its GPIB configuration model ATS2G GPIB capabilities can also be added to ATS 2 after purchase with the installation of a GPIB upgrade at the Audio Precision factory or at a factory authorized representative The GPIB configuration brings the IEEE 488 2 interface standard also known as the General Purpose Interface Bus or GPIB to ATS 2 Hardware for GPIB consists of a circuit board mounted on a connector panel assem bly that is fitted in the reserved space on the ATS 2 rear panel as shown below Fuse Holder Power Mai
33. 2 needs to be connected to an IBM compatible PC to operate The PC must have the following minimum features and capabilities m Microsoft Windows XP Professional Service Pack 2 or Microsoft Win dows Vista Business Edition 32 bit as the operating system NOTE You must have local administrator rights to install ATS software Go to User Accounts in the Windows Control Panel or check with your network administrator m Atleast the minimum processor type and memory required by Microsoft for the installed operating system m Atleast 300 MB of free hard disk space m A CD ROM drive m A USB 2 0 port or an open PCI PCI Express or PCMCIA slot to mount the APIB interface m A color monitor and a video card with at least VGA capabilities Video resolution of 1024 x 768 or greater is recommended You will also need signal interface cables to connect your ATS 2 instru ment to your device under test DUT Since there are many possible con nection configurations signal cables are not provided with the instrument Audio Precision offers cable kits with common connectors and adapters for purchase Contact a sales representative or visit the Audio Precision Web site at ap com for more information 8 Getting Started with ATS 2 Setting Up the ATS 2 Hardware Chapter 2 Installation and Setup for APIB Installing the Software To install the ATS software use the following procedure m Close all Windows programs m Insert the AT
34. 6 feet m One device must be attached to the bus for every two meters 6 feet of cable m Total cable length must not exceed 20 meters 66 feet m At least two thirds of the devices on the bus must be powered up for proper system operation ATS 2 GPIB Address and 1 0 Mode Switch Like all instruments on the bus ATS 2 must be set to a unique GPIB ad dress An address select switch bank with six slide switches sets the GPIB ad dress and the I O Mode The switch is shown below in Figure 30 The five switches to the right of the bank set the 5 bit binary primary address of the Getting Started with ATS 2 65 Chapter 7 GPIB Configuration The GPIB Software Development Process STAR CONFIGURATION LINEAR CONFIGURATION COMBINATION STAR AND LINEAR CONFIGURATION Figure 29 GPIB devices may be connected in star linear or combination star linear configurations instrument Legal addresses are 0 through 30 Set each switch up for a bi nary 1 or down for a binary 0 The left most switch in the bank sets the control mode independent of the GPIB address switch settings Click the switch to 0 down to set the control mode to GPIB The APIB port must not be connected to an active Audio Precision APIB interface card when the GPIB mode is selected Set the switch to 1 up to set the control mode to APIB The APIB mode disables the GPIB interface the pins are all set to the high imped ance state and enab
35. PIB cables are designed so they can be stacked if needed to connect multiple instruments into your GPIB system Getting Started with ATS 2 63 Chapter 7 GPIB Configuration The GPIB Software Development Process e e System controlled by GPIB erai rad software running on PC Td 39 ATS 2 set to GPIB mode qon APIB control is disconnected Auxiliary equipment controlled by APIB from ATS 2 Rear panel DIP switch set DOWN to select GPIB control Figure 27 APIB connections to ATS 2 with GPIB option in GPIB control mode SWR 2122 Switcher and DCX 127 connected to the APIB connector of the ATS 2 The computer APIB cable is not connected Interface Card GPIB Cable inactive L 1 e IEEE 438 2 GPIB System controlled by ATS ou software running on PC pum Mora rra ATS 2 set to APIB mode e GPIB control is inactive Rear panel DIP switch set UP to select APIB control Figure 28 APIB controller connections ATS 2 with GPIB option in APIB control mode Computer APIB cable connected to DCX 127 then to SWR 2122 then to ATS 2 When connecting instruments into a GPIB system observe the following rules m Connect and disconnect instruments from the bus only when the power to all instruments in the system is off m Assign a unique GPIB address to each instrument device on the bus 64 Getting Started with ATS 2 The GPIB Software De
36. R I connector the BNC connector or the optical connector In dual connector mode channels A and B are received on the XLR and II connectors respectively m ANALOG OUTPUTS The ATS 2 analog generator outputs both and B channels are available as unbalanced signals on the BNC connectors and as balanced signals on the XLR connectors m ANALOG INPUTS The XLR balanced and the BNC unbalanced connectors both A and B channels are connected to the ATS 2 analyzer inputs See Chapter 4 of the ATS 2 User s Manual for more information about the ATS 2 inputs and outputs and the panels associated with them ATS 2 Rear Panel The ATS 2 interface monitor headphone trigger sync and utility con nections are mounted on the rear panel Fuse Holder Power Mains Supply Mains Voltage Reserved for Monitor Switch Voltage Jumper Indicator GPIB Panel Sync RefIn Outputs TrigIn Trig Out 160 9 E p Lh e NEN eo uS US 3E AP NTERFACE ourryt X Power Fuse Power S N Option APIB i i Cord Replacement Entry Label Headphone Auxiliary Control In Ground Connector Information Module Jack Control Out Connector Figure 12 ATS 2 rear panel APIB only configuration m POWER ENTRY MODULE this module includes POWER SWITCH This switch turns the mains power supply to the ATS 2 hardware ON I or OFF 18 Getting Started with ATS 2 ATS 2 Rear Panel Chapter
37. S CD ROM into the CD ROM drive The installation program should start automatically If it does not click on the Start menu and choose Run Click Browse and choose the file Setup exe on the ATS CD ROM Click OK in the Run dialog box m Follow the installer on screen instructions Setting Up the ATS 2 Hardware Connecting ATS 2 to the Electrical Mains Supply ATS 2 must be connected to a 50 60 Hz alternating current AC elec trical mains supply maximum voltage 250 Vrms The units are configured at the factory for the expected voltage at their intended destination The voltage setting and fusing arrangement will nor mally be correct unless the unit has been transported into another area The power entry module has a strip of indicator tape showing its mains voltage setting This tape must be removed before use You MUST be sure that the ATS 2 mains power configuration is correct for the electrical mains power supplied in your area N If you are not sure do not plug ATS 2 in to the mains power Follow the instructions below to check or change the ATS 2 mains supply voltage selection SUPPLY VOLTAGE 100 120 230 240 VAC IEC CAT II FREQUENCY 50 60 Hz MAXIMUM POWER 60 VA Audi S on Tre ANE imac tate Figure 2 Detail power entry module on ATS 2 rear panel Getting Started with ATS 2 9 Chapter 2 Installation and Setup for APIB Setting Up the ATS 2 Hardware
38. You can switch between the time domain and frequency domain dis AN plays at any time by clicking the Sweep Spectrum Waveform button Fine Tuning the Display There are several ways to adjust the graph display to more closely ex amine features of the acquired waveform m Zoom On the graph draw a box by holding down the left mouse button and moving the mouse When you release the button ATS zooms the selected area to the full araph size m Zoomout After zooming click the right mouse button on the graph From this right click menu choose Zoomout The graph zooms out to the pre zoom size m Optimize From the right click menu choose Optimize Left Only The vertical axis changes to best fit the data in the graph Getting Started with ATS 2 43 Chapter 5 Quick Guides Saving and Loading Tests m For more details see Chapter 16 of the ATS 2 User s Manual Saving and Loading Tests At any time the current workspace setup can be saved to a file The file contains the settings on all the panels including panels that are not visible in the workspace the panel positions and references to any other files that were attached such as limit data The file also contains the most re cent data obtained from any sweeps that were run When a test is loaded the workspace reverts to the exact configuration it had when the test was saved The data from the test is available and can be further processed It can also be re gra
39. an be installed in a standard equipment rack using optional mounting hardware m The ATS measurement software which runs on a personal computer PC and provides the control display report and automation functions for the ATS 2 system The ATS software will run under Microsoft Windows XP and Windows Vista With the exception of the mains power switch on the rear panel there are no knobs dials controls readouts meters or switches on the ATS 2 chassis All of these functions are performed via the ATS software on the controlling PC Getting Started with ATS 2 1 Chapter 1 General Information ATS 2 Capabilities APIB The ATS control software on the PC communicates with the ATS 2 hardware in one of two ways m USB APIB Introduced with the release of ATS version 1 6 the USB APIB adapter provides a convenient USB interface to the instrument USB operation is not supported by earlier versions of ATS m APIB APIB Audio Precision Interface Bus is a proprietary bus interconnection that requires a dedicated APIB cable and PC mounted APIB interface card or adapter APIB interfaces are available as PCI PCI Express or PCMCIA compatible devices The USB APIB adapter or APIB interface are specified at the time your system is ordered An interface adapter kit can also be ordered separately GPIB When ordered in the optional GPIB configuration ATS2G ATS 2 can also be controlled by the industry standard IEEE 488 2 General Pur
40. an choose a setting unit As an example if the amplitude is set to 1 Vrms the drop down list in cludes conversions such as 1 414 Vp and 2 220 dBu If you click on the line displaying the amplitude in Vp the setting changes to 1 414 Vp The 34 Getting Started with ATS 2 Quick Guide to Sweeps Chapter 5 Quick Guides generator amplitude has not changed the setting is displayed in a different unit You can now set the generator amplitude in Vp Some units such as dBr depend on a reference being set Refer to Ap pendix A of the ATS 2 User s Manual for more information Quick Guide to Sweeps Most device testing with ATS 2 is performed with sweeps In a sweep a setting is stepped over a pre defined range while selected readings are gathered The result is a table of data relating the readings to each value of the setting For instance if you wanted to measure the frequency response of an an alog amplifier you might vary the frequency of the analog generator from 20 Hz to 20 kHz in 30 logarithmic steps while monitoring the analyzer channel A and channel B level readings The result would be a table of data with 30 rows one for each frequency step and 3 columns one for the frequency setting one for the channel A level reading and one for the channel B level reading You can force ATS 2 to perform a single point sweep for special purposes but generally the term sweep indicates that a number of data po
41. ck Guides Quick Guide to Sweeps set a sweep you must set Source 1 to the setting to be varied during the sweep set Data 1 to the reading to be collected during the sweep set the Start Stop Steps and Lin Log for Source 1 and m Click Stereo Sweep to collect data from both channels m set the Top and Bottom values and units for Data 1 Once the sweep is set up you can run it by clicking the Go button at he bottom of the Sweep panel We will now perform two example sweeps a frequency response sweep and an amplitude linearity sweep Example Sweep Frequency Response For this example we will measure the frequency response flatness of the ATS 2 itself We connect the analog output to the analog input sweep the frequency of the analog generator over the audio range and plot the level measured by the analyzer against frequency First click the New Test button turn the analog generator on and set both analog input channels to GenMon so that the generator signal is sent directly to the analog input Now open the Sweep panel The default sweep is a mono frequency response sweep so we only have to make a few modifications m Check the Stereo Sweep box to create a stereo sweep m Change the Steps from 30 to 100 for a more detailed response m The default range for Data 1 is quite wide and the units are Volts Change the units to dBV by clicking on the arrow next to the Top field From t
42. combined Signal Confidence Displayed for total signal both channels combined Receiver Lock Displayed for total signal both channels combined Coding Error Displayed for total signal both channels combined Sync Reference Input Characteristics Signal Compatibility AES3 AES3id 1995 SPDIF IEC 60958 28 8 100 kHz Video NTSC PAL or SECAM Squarewave 8 0 kHz to 10 0 MHz Minimum Input Amplitude 200 mVpp Input Impedance Nominally 75 Q or gt 5 Lock Range 0 0015 15 PPM Auxiliary Signals Monitor Outputs Signals Replicas of both analyzer inputs plus two additional signals depending on the measurement mode Not guaranteed to operate with sample rates above 108 kS s Typical Amplitude 0 to 4 Vpp Rs 422 Q System specification including contributions from both analyzer and generator Valid at 32 0 44 1 48 0 65 536 88 2 and 96 0 kS s only Flatness may degrade at other sample rates 12 System specification valid only if 1 the jitter generator amplitude is turned off 2 the digital input is 1 0 Vpp XLR or 250 mVpp BNC and 3 the analyzer is set for 700 Hz 100 kHz bandwidth Getting Started with ATS 2 55 Chapter 6 Specifications Auxiliary Control 1 0 Inputs 8 bits Absolute maximum range Float State Outputs 8 bits Voltage Range Trigger Input Absolute Maximum Range Minimum High Voltage Maximum Low Voltage Input Impedance Contact resistance for short control
43. dphone plug is inserted into the jack the internal speaker is disconnected By default the volume control for the speaker is below the toolbars near the top of the ATS workspace Move the volume slider control to the right with the mouse You will hear the 1 kHz tone from the generator become louder In the default setup the speaker monitors the signal presented to channel A of the analog analyzer Click the CHA button on the analog cua generator to disable the channel A generator The speaker will no longer emit the 1 kHz tone Controlling the Analog Generator The topmost two fields in the Analog Generator panel control the gener se H ator waveform The analog generator is capable of producing sine waves square waves noise and other waveforms At this point the waveform should be set to Sine Normal Pull down the left hand list box and choose Square to change the waveform to a square wave If you are monitoring the signal with the internal speaker you will hear the timbre of the signal change You will also see the signal level change in the Analyzer panel The square wave has a higher rms level than the sine wave for a given amplitude setting The square waveform has one parameter or setting the frequency This is set in the field below the waveform selection fields We will now change the generator frequency to 2 kHz as follows m Click in the Frequency field in the Analog Generator panel The text 1 00000 kHz b
44. e m Analog generator channel B disabled m Analog inputs A and B set to the internal generator path GenMon Figure 15 Current pengea s eNA gt ww aes Cs es workspace Pe teers elle References References 00000 eae 2873 dapes sv sv E Weatts 8 000 Ohms 0000 Ohms Fiea 1 00000 kHz V 000 Ohms dBmf600 0 Ohms For Help press F1 The topmost meters in the default Analyzer panel show the audio level in V rms You should see approximately 1 V in the left hand meter chan nel A and approximately O V in the right hand meter channel B Click the CHB button on the Analog Generator panel to re enable the channel 32 Getting Started with ATS 2 Quick Guide to the Analog Signal Path Chapter 5 Quick Guides B generator signal You now see approximately 1 V in the right hand level meter on the Analyzer panel since the channel B generator is now active and its signal is being routed to the analyzer via the GenMon internal path The meters in the next row of the Analyzer panel show the frequency of the signal in each channel Both of these meters should be showing 1 kHz the frequency of the analog generator Signal Monitor ATS 2 has an internal mono speaker to monitor both analog and digital input signals In addition the signal at the speaker is available also in mono at the headphone jack on the back of the instrument When a hea
45. e analog input Choose FFT Spectrum Analyzer from the Instru ment field at the top of the Analyzer panel Bring up the Sweep panel and click the Sweep Spectrum Waveform button on the Standard toolbar The sweep is automatically set up for a stereo frequency domain display from 20 Hz to 20 kHz Click Go to per form the sweep A graph similar to Figure 20 is created Figure 20 Typical default Ini xi FFT stereo frequency domain graph 100 200 500 2k 5k 10k 20k Hz 42 Getting Started with ATS 2 Quick Guide to the FFT Spectrum Analyzer Chapter 5 Quick Guides The large peak in the middle of the spectrum is the 1 kHz 1 V sine wave fundamental produced by the analog generator There are smaller peaks spaced at 1 kHz intervals above the fundamental These are har monic distortion components generated in the ATS 2 hardware These harmonics rise out of a wideband system noise floor To look at the audio signal in the time domain click the Sweep Spec cl trum Waveform button again Source 1 changes to FFT Time and the graph updates to show the new data You should see graph similar to Figure 21 Figure 21 Typical default o xl FFT stereo time domain graph The display shows a sine wave with a period of 1 ms corresponding to a frequency of 1 kHz and a peak excursion of 1 414 V corresponding to an amplitude of 1 Vrms The effect of the distortion on the waveform is not visible in the time domain
46. e uobis ee 2 6o eo e ha eae DOG ee BE Sew he 2 ATS 2 Capabilities ee 2 Conceptual Architecture 5 22 5 AboutThisManudl a a 4 Online Help llle 4 Other Documentation for 2 4 ATS 2 User s 4 AP Basic User s Guide and Language Reference 5 AP Basic Extensions Reference for 5 2 5 Other Publications 0 00 5 GPIB Documentation for 5 2 5 Chapter 2 Installation and Setup for APIB 7 ATS 2Components 00 0000005 ae 7 Getting Up andRunning 7 Installing ATS SoftwareonaPC 8 PC System 8 Installing the Software 9 Setting Up the ATS 2 9 Connecting ATS 2 to the Electrical Mains Supply 9 Checking the Mains Supply Voltage Configuration 10 Opening the Power Entry Module 10 Changing the Mains Supply Voltage Configuration 11 Getting Started with ATS 2 Fuse Information 12 Changing the Fusing Arrangement 12 Connecting ATS 2 to Your PC 13 The USB APIB adapter andcables 13 The APIB PCI Express andcable 14 The APIB PClcarda
47. ease measurement bandwidth Analog Domain vs Digital Domain Analog audio signals are electrical analogies of the sound waves that they represent varying in frequency and amplitude in a continuous fashion In analog audio electronics these voltages and currents are manipulated processed and measured by modifving their amplitude or frequency The term analog domain refers to signals represented and processed in this fashion Digital audio signals on the other hand are numerical representations of the sound waves The representation is often carried on an electrical signal called the interface signal Digital audio is processed mathematically in processes gathered together under the name of Digital Signal Processing or DSP The term digital domain refers to signals represented and processed in this fashion Getting Started with ATS 2 3 Chapter 1 General Information About This Manual About This Manual You re reading Getting Started with ATS 2 This manual describes how to set up the ATS 2 hardware and ATS software It also contains a quick tutorial to familiarize you with the system It is organized as follows m Chapter 2 Software installation and hardware setup information Chapter 3 Description of the hardware and its connectors Chapter 4 Description of the user interface B B m Chapter 5 Introductory tutorial m Chapter 6 Specifications B Chapter 7 GPIB Configuration Much of the information contai
48. ecomes highlighted in blue m Use the keyboard to type 2k the new generator frequency As you 2H can hear in the monitor speaker the frequency does not change m Hit enter The text changes to 2 00000 kHz the pitch increases from the monitor speaker and the frequency reading in the Analyzer panel changes to 2 00000 kHz Getting Started with ATS 2 33 Chapter 5 Quick Guides Quick Guide to the Analog Signal Path Track amp 0 000 dBilnv Now switch the waveform type back to sine The current square wave frequency is used for the sine wave You can enter standard SI prefixes for multipliers as you enter the value in the setting field For example 2000 2k 0 002M and 2000000m all produce the same frequency All waveforms can be generated at any amplitude from 0 V to the maximum output voltage of the instrument The amplitude for each chan nel is controlled by fields below the OUTPUTS field If the Track A selec tion is checked the amplitude is identical in both channels and is set by the channel A Amplitude field at the left of the panel If Track A is un checked a channel B Amplitude field appears at the right of the panel and the amplitudes of the two channels can be varied independently Change the channel A amplitude to 0 5 V by clicking in the Amplitude field on the Analog Generator panel typing 0 5 and hitting enter The level meter reading on
49. eps 20 Multiply 734 328 m _Table Sweep Repeat V Stereo Sweep Append I Single Point To choose the setting to be varied click on the ellipsis button to the right of the Source 1 field In the browser choose an instrument from the left pane and a setting from the right pane For instance if you choose An alog Generator from the instrument side and Frequency from the setting side the frequency of the analog generator will be varied during the sweep This is shown in the Source 1 field as Analog Generator Frequency To choose a reading to be gathered click on the ellipsis button to the right of the Data 1 field The browser shows instruments in the left pane and readings in the right pane If you choose the Analyzer instrument and the Level A reading the level on channel A will be recorded during the sweep This is shown in the Data 1 field as Analyzer Level A The Stereo Sweep checkbox near the bottom of the Sweep panel au tomatically ensures that readings from both channels are gathered during 56 Getting Started with ATS 2 Quick Guide to Sweeps Chapter 5 Quick Guides the sweep For instance if you choose Analyzer Level A as the reading in Data 1 and then check the Stereo Sweep checkbox the reading Ana lyzer Level B will also be gathered during the sweep Source Range Steps and Spacing During the sweep the setting in Source 1 is stepped from the Start
50. erform many common audio measurements With this information and some knowledge of ATS 2 theory and opera tion you can develop custom software to control your GPIB system A rec ommended path of software development is discussed in the following topics The GPIB Software Development Process A practical working knowledge of ATS 2 is required in order to develop effective GPIB software for it Figure 23 illustrates a typical software devel opment scenario in which the Audio Precision ATS measurement software is used to develop expertise with the ATS 2 before attempting to integrate the instrument into a larger system controlled by a GPIB interface software program Since the GPIB programming commands for ATS 2 are modeled di rectly on the ATS user interface the fastest path for GPIB software devel opment involves the use of the ATS measurement software as a learning tool Working in ATS you can develop test methods for your DUT and build confidence that your methods are correct You can use AP Basic and the Learn Mode button on the tool bar to develop AP Basic macros that per form the tests you wish to develop for GPIB As you learn how ATS 2 best operates under ATS control the tasks involved in developing equivalent code for the GPIB port will be greatly simplified 60 Getting Started with ATS 2 The GPIB Software Development Process Chapter 7 GPIB Configuration ATS 2 GPIB Developer s Kit Define the Test
51. essed as a listener two program message terminators PMT are supported Getting Started with ATS 2 67 Chapter 7 GPIB Configuration The GPIB Software Development Process m EOI line asserted with the NL character ASCII 10 the linefeed character m EOI line asserted with the last byte of a message The NL character alone without EOI is not supported When the instrument is addressed as a talker one PMT is supported m FOl line asserted with the NL character ASCII 10 the linefeed character 68 Getting Started with ATS 2
52. f this manual and Chapter 15 of the ATS 2 User s Manual Getting Started with ATS 2 25 Chapter 4 ATS 2 User Interface Status Bar Compute Menu The Compute menu gives access to ATS s built in post processing func tions Data collected during a sweep is available for post processing See Chapter 19 of the ATS 2 User s Manual for details Macro Menu The Macro menu allows you to access the editing and debugging func tions for AP Basic macros AP Basic is the programming language supplied with ATS and macros can be written to control all aspects of ATS 2 func tionality See Chapter 23 of the ATS 2 User s Manual for details Utilities Menu The Utilities menu allows you to initialize and configure the hardware and manipulate the system log file It also launches the multitone creation tool See Chapter 25 of the ATS 2 User s Manual for details Window Menu The Window menu lists the current open panels and allows them to be arranged automatically in the workspace The Help menu allows you to access ATS s on line help system You can also use the F1 key to access help for a particular control or panel field Status Bar The Status bar runs across the bottom of the workspace The left portion displays the following information m Current hardware status m Information about the button or menu item currently under the mouse pointer For Help press F1 Page 1 Page2 Page 3 Page 4 Page 5 Z At the ri
53. ght the Status bar shows the workspace page tabs A bold tab label indicates that a page contains at least one panel The currently dis played page is highlighted Click on a tab to switch pages 26 Getting Started with ATS 2 Toolbars and Buttons Chapter 4 ATS 2 User Interface Toolbars and Buttons ATS has five toolbars for quick access to panels and common functions The toolbars can float at any location in the workspace or they can be docked to the Menu bar Whether floating or docked the toolbars appear on every workspace page Buttons on the toolbars control ATS functions A ToolTip describing the button s function appears when the mouse is held over a button for a short time See Chapter 2 of the ATS 2 User s Manual for more information Standard Toolbar Standard The Standard toolbar gives you quick access to ATS file printer and ed iting operations as well as Sweep Stop Start and Sweep Spectrum Wave form switching Panels Toolbar The Panels toolbar gives you quick access to commonly used ATS pan els The panels are also available from the Panels menu Macro Toolbar The Macro toolbar offers operations for running and editing an AP Ba sic Macro See Chapter 23 of the ATS 2 User s Manual for explanations of Macro toolbar button functions Getting Started with ATS 2 27 Chapter 4 ATS 2 User Interface Using Files with ATS Learn Mode Toolbar EN ey The Learn Mode t
54. he default setup click the New Test button or the File gt New gt Test command ATS will discard your current settings and data and reload the default setup You can open previously saved tests and use them as they are or you can modify and re save the tests under the same name or a new name Sample tests are included with ATS 2 and you can use them as starting points for your own custom tests Macro Files A macro file is a programming script which automates program func tions ATS macros are written in the AP Basic programming language which is included with ATS The filename extension for macro files is m AP Basic macro file atsb Data Files ATS stores data from test results in memory as the test is run As men tioned this information is saved along with panel and sweep setup infor mation in a test file The data can also be viewed and edited in the Data Editor panel and can be saved as a separate file ATS can open saved data files to attach previous data to a current test There are four different data file types AP data file atsa AP limit file atsl AP sweep file atss AP EQ file atsq The four ATS data file types are identical except for their filename extensions Data saved as atsa atsl atss or atsq files can be opened or attached for any data function The four filename extensions serve as a way to organize your data files It is also possible to export ATS data as an ASCII
55. he down arrow next to the Instrument field at the INTERVU Digital Interface Analyzer top of the Analyzer panel From the list of instruments choose FFT Spec fast est Muttone uso Anas trum Analyzer The panel changes to display the new instrument Getting Started with ATS 2 41 Chapter 5 Quick Guides Quick Guide to the FFT Spectrum Analyzer FI BI RII Q Go Panel Fields There are two peak monitors near the top of the panel one for each of the stereo channels These meters give an indication of the presence of sig nal at the FFT input Below the peak meters is an array of fields for configuring the analyzer Here we will use the default settings For more details on the settings see Chapter 11 of the ATS 2 User s Manual Time vs Frequency As mentioned the FFT spectrum analyzer can display audio signals in the time domain and the frequency domain The choice of domain is de termined by the Source 1 field on the Sweep panel If it is set to FFT Time a time domain display results If it is set to FFT Frequency a frequency do main display results The Sweep Spectrum Waveform button in the standard toolbar allows FFT sweeps to be set up quickly We will use this feature to examine har monic distortion in the ATS 2 system Quick Sweep Setup First perform a New Test turn the analog generator on and set both analog input channels to GenMon so that the generator signal is sent di rectly to th
56. he list choose the ABV line Note that the units in the Bottom field change also In the Top field type 0 1 In the Bottom field type 0 1 You can now click the Go button to run the sweep A graph is created and the response is plotted as the sweep progresses If you are monitoring using the internal speaker you will hear the analog generator frequency step through the audio range The result will be a response curve that devi ates only slightly from 0 dBV as shown in Figure 18 38 Getting Started with ATS 2 Quick Guide to Sweeps Chapter 5 Quick Guides Figure 18 Current Tu workspace after frequency response sweep showing typical results p Example Sweep Amplitude Linearity For this example we will measure the amplitude linearity of the ATS 2 With the analog output connected to the analog input we sweep the am plitude of the analog generator over its full range and plot the ratio of the level measured by the analyzer to the generator output level in dB Any amplitude non linearity in the system will show as a deviation from dB First perform a New Test turn the analog generator on and set both analog input channels to GenMon so that the generator signal is sent di rectly to the analog input Now open the Sweep panel and make the fol lowing changes m Click the Source 1 browser button and choose Analog Generator as the instrument and ChA Amplitude as the
57. ints are included in the measurement When a sweep is performed a graph is also created This is a graphical representation of the data obtained during the sweep Figure 16 shows an example of a stereo frequency response graph Figure 16 A typical 1 Audio Precision EQ FREQUENCY RESPONSE RIAA Phono Preamp frequency response graph 100 200 This section is an introduction to sweeps The Sweep panel contains many more features that are described in Chapter 15 of the ATS 2 User s Manual Getting Started with ATS 2 35 Chapter 5 Quick Guides Quick Guide to Sweeps ol v Stereo Sweep Sweep Fundamentals Settings and Readings To set up a sweep open the Sweep panel either by choosing Pan els gt Sweep or by clicking on the Sweep button The Sweep panel is di vided horizontally into two major areas the Data reading area above and the Source setting area below During the sweep the setting chosen in the Source 1 field is varied and the readings specified in the Data fields are gathered Figure 17 The Sweep panel This Sweep gt gt Data 3 gt gt configuration was used to create the Data qfAnayeerlevelA 7 Level A graph of Figure 16 500 e lE Bottom 1 500 d amp lea Lin Divs Limits x tof of Autoscale Bottom ze tese Lin Dye Jv Auta guo Source 1 Analog GeneratorFrequency ES Stop 20 0000 Hz gt Auta St
58. io 4 1 or 1 1 LF HF Residual IMD lt 0 0025 92 dB Square wave Frequency Range 10 Hz to 20 kHz Risetime Typically 2 0 us Noise Signal White Pseudo Random Rectangular PDF 60 kHz BW Polarity Test Signal Sum of two sinewaves phased for reinforcement with normal polarity Frequency Range 2 Hz to 30 kHz Pass Thru Passes the embedded audio signal from the rear panel Sync Ref Input Output Sample Rate OSR must be within the range of 0 334 to 3 000 of the Sync Ref Input sample rate Frequency Accuracy 0 0002 2 PPM internal reference lockable to external reference Analog Signal Generator Outputs Analog Output Characteristics Source Configurations Balanced XLR Unbalanced XLR and BNC or Common Mode Test XLR 3 System specification with 60 Hz 7 kHz or 250 Hz 8 kHz test signal combinations and Vin 200 mV 46 Getting Started with ATS 2 Chapter 6 Specifications Source Impedances Rs Balanced or CMTST Unbalanced Amplitude Range all Waveforms Balanced Unbalanced or Common Mode Test Amplitude Accuracy Amplitude Resolution Max Output Power into 600 Balanced Unbalanced Output Current Limit DC Offset Output Related Crosstalk Waveforms Nominally 40 Q or 150 Q standard configuration Nominally 40 Q or 200 O EURZ option Nominally 40 Q or 600 O 600Z option Nominally 20 Q or 50 Q Each analog output is independently settable 250 yVrms to 16 00 Vrms 700 pu
59. les APIB to control the ATS 2 66 Getting Started with ATS 2 The GPIB Software Development Process Chapter 7 GPIB Configuration SRQ IEEE 488 2 GPIB GPIB b ERR 1 oom 0 eo GPIB 4168421 SH1 AH1 6 TEQ L4 LEQ SR1 ADDRESS RL1 PP DC1 DT1 C E2 Figure 30 ATS 2 GPIB Option panel Address Switch Status LEDs and GPIB port GPIB Status LEDs The six GPIB Status LEDs shown in Figure 30 indicate the current status of the GPIB bus When an LED is illuminated the status indicated is as fol lows m SRQ SRQ interrupt The instrument has asserted the SRQ line in order to request service from the GPIB controller m GPIB The instrument is under the control of the GPIB interface set by the control mode switch The APIB connector will be driven internally by the instrument GPIB interface board m TA Talk Addressed The instrument is talk addressed by the GPIB controller m LA Listen Addressed The instrument is listen addressed by the GPIB controller m MAV The instrument has one or more bytes in the output queue and has asserted the MAV Message AVailable bit in the Status Byte Register m ERR The instrument has detected an error condition that has not been reported to the system controller This LED goes off when the error condition has been reported in response to the ERRM or ERRS error queries GPIB Program Message Terminators When the instrument is addr
60. ltage and your fusing arrangement Once you have verified that the line voltage selection is correct connect the power cord from a mains power outlet to the power cord connector on the instrument rear panel Connecting ATS 2 to Your PC The ATS control software communicates with the ATS 2 instrument through the Audio Precision Interface Bus APIB You will have received one of the following interface adapter options with your instrument as or dered The instructions below assume you have already installed the ATS software on your PC or laptop The USB APIB adapter and cables Connect the USB cable from a USB 2 0 port on your PC or laptop to the USB jack on the adapter Connect the APIB cable from the adapter to your ATS 2 Turn on the instrument and the PC and launch ATS Figure 7 PCMCIA card and cable For best perfomance we recommend that you connect the USB APIB adapter directly to the PC USB 2 0 port and that you do not use a USB hub for this connection USB 1 0 or 1 1 ports or hubs cannot be used Getting Started with ATS 2 13 Chapter 2 Installation and Setup for APIB Connecting ATS 2 to Your PC The APIB PCI Express card and cable Turn off your PC and mount the PCI Express card in an open PCI Ex press slot Connect the PCI Express card to the instrument using an APIB cable P Om Figure 8 PCI Express card and cable Note that PCI Express cards will not mount in standard PCI slots and that y
61. ndcable 14 The APIB PCMCIA and cable 15 Chapter 3 Hardware Overview 00 17 5 2 17 5 2 Rear Panel 18 Chapter 4 ATS 2 User Interface 21 OvervVieW 2s 21 A Note on Nomenclature 21 Starting up the ATSSoftware 22 ATSWOFKSD aCOe zo bb eee BRS BES Gd ee 899 34 22 ATS PANEIS a Erde hee BO et ne a ee BA 23 5 5 24 5 24 ATSMenus 02 0 25 FIS MENU a a x b 25 MERU PPP 25 VIEW MENU us eg a Bee ee e h 25 5 25 Sweep 25 Compute 26 Macro Men u Sw 26 UtilitiesMenu woe iem ow Ee R33 E o3 26 Window MENU Aen 26 Help Men uuo RC eg RE 26 Status Bar ss exque wed Pe de 26 Toolbars and Buttons llle 27 standard Toolbar 27 Panels Toolbar 27 Macro Toolbar 27 Learn
62. ned in the ATS 2 User s Manual is also available in the online help system included in the ATS software You can access the help system in two ways m ATS has context sensitive help Almost every control and display on each software panel has a help topic associated with it To view the topic click on the field or control then press the F1 function key m On the Menu bar click Help The Help menu offers commands to search the Help Index browse through the Help Topics or select a specific help library such as AP Basic Language Other Documentation for ATS 2 Audio Precision publishes a variety of documents many in electronic form about hardware and software products audio theory and test and measurement techniques The following list describes the documents that are included as Adobe Acrobat Portable Document Format PDF files on the Audio Precision Resources Disc They can also be downloaded from our Web site at ap com ATS 2 User s Manual The ATS 2 User s Manual is the primary operation and reference man ual for the system Consult the ATS 2 User s Manual for m Detailed descriptions of every ATS 2 feature software panel control and display m Reference information on audio test and measurement techniques sample and utility file listings and an audio glossary 4 Getting Started with ATS 2 Other Documentation for ATS 2 Chapter 1 General Information AP Basic User s Guide and Language Reference You can crea
63. ns Supply Mains Voltage Monitor Switch Voltage Jumper Indicator GPIB Panel Sync RefIn Outputs Trig Out e LI 9 m Rr ec c UEED UP E Power Fuse Power S N Option APIB Auxiliary 1 Cord Replacement Entry Label Headphone Auxiliary Control In Ground Connector Information Module Jack Control Out Connector Figure 22 Rear panel ATS 2 with GPIB Option APIB or GPIB ATS 2 is normally controlled by Audio Precision s ATS measurement software using the APIB interface bus In the GPIB configuration ATS 2 Getting Started with ATS 2 59 Chapter 7 GPIB Configuration The GPIB Software Development Process can be controlled by either GPIB or APIB as selected by a switch on the GPIB hardware mounted on the ATS 2 rear panel The GPIB configuration makes it possible to integrate ATS 2 hardware into a system that may include other GPIB compatible instruments and de vices under operated by your choice of GPIB control software Audio Precision does not provide control software for GPIB applica tions We do offer full documentation of the ATS 2 functions controllable by GPIB in the ATS 2 GPIB Programmer s Reference Manual which con tains a listing of all ATS 2 GPIB commands and detailed explanations of command parameters The reference manual comes with a companion CD ROM that contains sample programs written for Microsoft Visual Basic These programs provide examples of how to control ATS 2 to p
64. nu item Please re fer to Chapter 2 of the ATS 2 User s Manual for more details File Edi View Panels Sweep Compute Macro Utilities Window Help The File menu offers commands for opening saving appending im porting exporting and printing ATS files and accessing the Quick Launch menu Since there are several file types used by ATS submenus are available at the small black arrows accompanying some menu choices to choose for example whether to Save As a Test Data or Macro file The listings at the bottom of the File menu show the last tests opened by ATS and provide a convenient way to open a recent test Edit Menu The Edit Menu provides editing commands The standard Windows ed iting functions Undo Cut Copy and Paste are available together with functions unique to ATS Consult the ATS 2 User s Manual for details View Menu The View menu allows you to select which workspace page is visible and which toolbars are displayed A checkmark next to a View menu item indicates that the selection is visible See the Toolbars and Buttons section below for more information on toolbars Panels Menu The Panels menu allows you to select which panels are visible on the current page It duplicates the functions of the Panel toolbar described below Sweep Menu The Sweep menu controls operation of the sweep The sweep is the fun damental method used to collect measurements in ATS For more informa tion see Chapter 5 o
65. oolbar gives you the ability to turn Learn Mode on and off Learn Mode logs your ATS operations as you perform them building a macro for automation purposes See Chapter 23 of the ATS 2 User s Manual for more information on Learn Mode Quick Launch Toolbar Nm The Quick Launch toolbar allows you to access user defined functions You can create Quick Launch buttons to open ATS tests run AP Basic macros and launch other Windows programs See Chapter 2 of the ATS 2 User s Manual for instructions on customizing and using the Quick Launch toolbar Using Files with ATS Part of the power of ATS is its ability to create store load and run files which contain test setup and measurement data information The primary document in the ATS software is the test although ATS uses other file types as well Test Files When you first launch ATS a default setup is loaded You can modify this initial setup by opening or closing panels changing configuration making settings running a sweep and so on You can then save your cus tom setup as a test ATS saves the instrument and sweep setup informa tion the input and output configuration and the panel sizes and positions If you have run a sweep and collected data the data is also saved in the test file The filename extension for test files is m ATS 2 test file ats2 28 Getting Started with ATS 2 Using Files with ATS Chapter 4 ATS 2 User Interface To return to t
66. ou may damage the card and your PC by forcing an interface card into the wrong slot Turn on the PC and the instrument and launch ATS The APIB PCI card and cable Turn off your PC and mount the PCI card in an open PCI slot Connect the PCI card to the instrument using an APIB cable Figure 9 PCI card and cable Note that standard PCI cards will not mount in the newer PCI Express slots and that you may damage the card and your PC by forcing an interface card into the wrong slot Turn on the PC and the instrument and launch ATS 14 Getting Started with ATS 2 Connecting ATS 2 to Your PC Chapter 2 Installation and Setup for APIB The APIB PCMCIA card and cable Connect the small connector on the PCMCIA APIB cable to the match ing connector on the PCMCIA card Turn off your laptop and slide the card into an open PC card slot Connect the other end of the APIB cable to the instrument Turn on you laptop and launch ATS Figure 10 USB APIB adapter and cables Note if your PC is fitted with more than one APIB interface adapter when ATS is launched Microsoft Windows will select one to communicate with the software An installed USB APIB adapter will have priority Getting Started with ATS 2 15 Chapter 2 Installation and Setup for APIB Connecting ATS 2 to Your PC 16 Getting Started with ATS 2 Hardware Overview The ATS 2 hardware includes input and output connectors ranging and
67. phed automatically when the test is loaded See Chapter 25 of the ATS 2 User s Manual for more details To save the current workspace choose File gt Save gt Test or click the Save Test button in the Standard toolbar To load a lest choose File gt Open gt Test or click the Open Test button in the Standard toolbar The Next Step In this chapter we have introduced two instruments the audio analyzer and the FFT spectrum analyzer ATS has other instruments to measure au dio signals in different ways The ATS 2 User s Manual describes all the in struments in detail We have also introduced the sweep which is at the heart of ATS auto mated measurements The sweep engine and its features are described in more detail in Chapter 15 of the ATS 2 User s Manual We set up tests by hand using the mouse and keyboard and saved them to disk ATS also contains a complete programming language to al low you to execute complex measurement sequences programmatically Chapter 23 of the ATS 2 User s Manual describes how to program the in strument and the AP Basic User s Guide and Language Reference de scribes the language itself 44 Getting Started with ATS 2 Chapter 6 Specifications Unless otherwise noted all analyzer specifications assume dc coupling rms detection autoranging on and high resolution conversion at 65 536 kS s The abbreviation SR refers to the relevant output or input sample rate 1 kS s 1 kHz
68. pose Interface Bus GPIB See Chapter 7 for more information about the ATS 2 GPIB configuration ATS 2 Capabilities m ATS 2 can make amplitude frequency THD N noise phase crosstalk bandpass and IMD measurements for analog or digital audio devices In a special function ATS 2 can perform detailed analysis and measurement of harmonic distortion products m ATS 2 can perform complex sweeps and display and print the results with a powerful araphing engine ATS 2 offers control over instrument regulation and settling parameters Data obtained from sweeps can be compared to pre defined limits A variety of computations can be performed on the measured data after acquisition Tests and data can be saved and recalled and ATS 2 measurements can be automated by macros written in the AP Basic programming language m ATS 2 can perform measurements using fast Fourier transform FFT analysis Advanced high speed FFT analysis techniques are available including multitone recognition and analysis frequency adjustment for bin centering synchronous FFT processing and advanced post FFT analysis 2 Getting Started with ATS 2 Conceptual Architecture of ATS 2 Chapter 1 General Information m ATS 2 can examine an AES EBU digital interface signal and assure the integrity of digitally transmitted data It can also measure and examine the jitter in the waveform ATS 2 can extract a variety of statistics from a digital waveform including the
69. r INPut DSP DANLr LEVel DSP DANLr AUTorange DSP DANLr FREQ DSP DANLr RANGe DSP DANLr FUNCmeter DSP DANLr MODE DSP DANLr FRANge DSP DANLr FAUTorange DSP DANLr DETector DSP DANLr RDGRate DSP DANLr LPFilter DSP DANLr HPFilter DSP DANLr TUNingsrc DSP DANLr WTG DSP DANLr FILTerfreq DSP REF DBRA DSP REF DBRB DSP REF FREQ DSP REF VFS Figure 24 ATS 2 Audio Analyzer panel with GPIB command call outs Using both GPIB and APIB for Software Development Your ATS 2 already has an APIB port on the rear panel The GPIB op tion adds a GPIB port and configuration switches and indicators The rear panel switches provide a means to select which port is to be used to con trol ATS 2 and to assign the instrument s GPIB address During the soft ware development process you may switch between the two modes in order to take advantage of the interactive development environment of the ATS measurement software The two ports cannot control ATS 2 simultaneously You must select GPIB or APIB as the control port To use GPIB to control ATS 2 connect an appropriate cable from the GPIB interface card on the controlling computer to the port on ATS 2 and select GPIB on the rear panel switch as shown in Figure 25 left most switch clicked down to 0 An LED will light to indicate that GPIB is selected When the GPIB port is in control the APIB port on ATS 2 must be dis connected from the APIB interface card in the
70. s which allow you to set non exclusive conditions C Log Lin m Option buttons which provide for exclusive conditions Analog GeneratorHigh Freq jul m Browser buttons which open Windows browsers These allow you to navigate lists of options search for a file by browsing through a hierarchy of folders and so on Browser buttons are identified by the ellipsis mark mm Outputs EJ m Custom buttons which have a special function such as GO ON OFF and so on m Sliders with which you can continuously adjust a value Sliders are found on Bar Graph panels and the Volume Bar Sliders can be operated by the mouse pointer or the arrow keys Panel Readings Results of tests or measurements are called readings which ATS 2 can display in several ways 5 44 m Heading fields sometimes called meters Reading fields come in two variations with and without a drop down list to select units Reading fields display green characters on a black field lock coding m Status indicators which show the presence or absence of a condition by a small colored rectangle m Bar graphs which display values as a continuous colored bar like a conventional analog meter as 005 ds A 24 Getting Started with ATS 2 ATS Menus Chapter 4 ATS 2 User Interface ATS Menus The Menu bar extends across the top of the ATS workspace and is al ways visible Here we give a brief overview of each me
71. signals gt 0 554xSR Performance option A D typically gt 85 dB for signals gt 0 540x SR Multitone Audio Analyzer Acquisition Length 512 to 32768 samples in binary steps Transform Length 512 to 32768 samples in binary steps Measurements Amplitude vs Frequency Total Distortion vs Frequency Noise vs Frequency Phase vs Frequency Crosstalk vs Frequency and Masking urve Frequency Resolution SR Length 2 0 Hz with SR 65 536 kS s and Length 32768 Both analyzer input channels must have same coupling ac or dc selection Analog accuracy is valid for any input signal amplitude ratio up to 30 dB Getting Started with ATS 2 53 Chapter 6 Specifications Frequency Correction Frequency Range Spurious Products Residual Distortion Analog 4 of input frequency 7th FFT bin low limit to 0 45xSR high limit 120 dB x 105 dB SR 65 kS s lt 90 dB SR 262 kS s with performance option 140 dBFS Digital Analog Input Characteristics Input Ranges Maximum Rated Input 355 mVp to 200 Vp 250 mVrms to 140 Vrms in binary 6 02 dB steps 200 Vp 140 Vrms dc to 20 kHz overload protected in all ranges Input Impedance Balanced Option 600Z adds Unbalanced Nominal 200 kQ 95 pF Nominal 600 Nominal 100 kQ 185 pF Option 600Z adds CMRR 355 mVp to 5 6 Vp ranges 11 2 Vp to 200 Vp ranges Nominal 600 Q gt 80 dB 10 Hz to 20 kHz z50 dB 10 Hz to 1 kHz l
72. t 100 dB 3 uV at 20 kHz Input Related Crosstalk Digital Input Characteristics Formats Balanced XLR Unbalanced BNC Optical Toslink amp AES3 per AES3 1997 SPDIF EIAJ per IEC 60958 per IEC 60958 3 28 8 kHz to 108 kHz per connector Sample Rates Word Width Input impedance Balanced XLR Unbalanced BNC 8 to 24 bits Nominally 110 Q or 22 5 Nominally 75 Q or 3 kQ Digital Interface Measurements Input Sample Rate Internal Reference External Reference 30 000396 3 PPM 50 000196 1 PPM Input Voltage Balanced XLR Unbalanced BNC 200 mV to 5 10 Vpp 10 50 mV 100 mV to 1 275 Vpp 1095 12 mV T OMRR performance below 50 Hz degrades substantially with AC coupling 54 Getting Started with ATS 2 Chapter 6 Specifications Jitter Amplitude peak calibrated 50 kHz 100 kHz BW 0 to 3 00 UI 10 2 ns other BW selections 0 to 1 00 UI 10 2 ns Jitter Flatness 1 dB 100 Hz to 20 kHz Residual Jitter lt 2 ns 0 012 UI at 48 kS s 0 024 UI at 96 kS s Jitter Spectrum Spurious are typically 0 003 UI 50 dBUI or 30 dB below jitter signal whichever b larger Channel Status Bits Full implementation per IEC 60958 English language decoded common to both channels Formats Professional or consumer or Direct Hex source User Bits Not displayed Validity Flag Displayed for each channel Parity Displayed for total signal both channels
73. te tests and macros to automate your measurements Mac ros are written in the AP Basic programming language which is a subset of Microsoft Visual Basic The AP Basic User s Guide and Language Ref erence available as a PDF on the Audio Precision Resources disc contains a list of the AP Basic commands each with a full description and examples of usage AP Basic Extensions Reference for ATS 2 The AP Basic Extensions Reference for ATS 2 available as a PDF on the Audio Precision Resources disc contains a list of OLE ActiveX automa tion commands that control the specific features of the ATS 2 hardware and the ATS software Other Publications Audio Precision publishes application notes tech notes technical papers and training materials that cover all aspects of audio test and measure ment Information about our library of technical papers and announce ments of new papers is available from Audio Precision Technical Support and on the Audio Precision Web site GPIB Documentation for ATS 2 When ordered in the optional GPIB configuration ATS 2 can also be controlled by the industry standard General Purpose Interface Bus GPIB Basic installation with GPIB is covered in Chapter 7 of this manual For GPIB development and programming order the ATS 2 GPIB Program mer s Reference Manual which includes a CD ROM with GPIB sample program files Getting Started with ATS 2 5 Chapter 1 General Information Other Documentation
74. text file for use in a spreadsheet or text editor program The filename extension for an ASCII data file is m AP ASCII data file atsx Getting Started with ATS 2 29 Chapter 4 ATS 2 User Interface Using Files with ATS Waveform Files For certain functions including FFT displays and some types of inter face analysis ATS 2 acquires a sample of the input waveform These sam ples can be saved as waveform files and later opened by ATS for further use The filename extensions for waveform files are AP stereo waveform file generator ags AP stereo waveform file analyzer aas a B m AP mono waveform file generator agm m AP mono waveform file analyzer aam AP digital interface waveform file aai Log File ATS can generate a log file for debugging The log file contains error messages file and sweep activity graph information and pass fail test results The filename extension for the log file is m AP log file alg The log file is enabled and set up on the Configuration panel and is dis cussed in detail in Chapter 25 of the ATS 2 User s Manual Downloadable Filter Files ATS 2 can make use of custom filters designed and downloaded by the user Downloadable filters are defined in text files whose format is de scribed in Appendix D of the ATS 2 User s Manual The filename extensions for downloadable filter files are m AP downloadable lowpass filter file afl
75. the Analyzer panel will change You will also hear relays click if the system needs to change the analog range Now uncheck Track A and set the channel B amplitude to 10 V The level meters on the Analyzer panel will show the different levels Both frequency meters how ever will show the same frequency This is because the Sine Normal wave form generates identical frequencies in the two channels The Sine Stereo waveform which is obtained by choosing Sine from the left hand waveform field and Stereo from the right hand waveform field generates independent frequencies in the two channels You can ver ify the frequency in each channel by referring to the frequency meters on the Analyzer panel Units Settings and readings consist of a value and a unit ATS can convert the units of a setting or reading to a related unit For instance the analog gen erator amplitude can be set in Vp volts peak dBV decibels relative to 1 V and several other units Similarly readings can be displayed on a meter in any of the related units The list of units for a setting or reading can be viewed by clicking the downward pointing arrow next to the setting or reading field For instance the list of units for the analog generator amplitude can be displayed by clicking on the arrow next to the Amplitude field on the Analog Generator panel ATS displays the value currently in the field converted to each available unit By clicking on the list you c
76. three options m Choose Try Again if you have connected and switched on the ATS 2 instrument m Choose Demo Mode In this mode the software presents panels and menus as if hardware were connected but panel meters show random data This mode can be used for creating tests editing data etc m Choose Cancel to exit the software If you have chosen to run the software ATS will start up and show the workspace ATS Workspace zinl x 1 00000 kHz 387 3 mV f 8 000 Ohms 600 0 Ohms Figure 13 The ATS workspace The ATS workspace has five pages that you can select by menu com mands View gt Page or by clicking the numbered tabs on the Status 22 Getting Started with ATS 2 ATS Panels Chapter 4 ATS 2 User Interface Bar The workspace is a multi layered desktop where you can display and organize the instrument panels you are using for a particular set of tests ATS Panels Interaction with ATS 2 is performed through control and measurement windows called panels These duplicate the function of physical control panels found on conventional test and measurement equipment The pan els are available through menu commands toolbar icons and keyboard shortcuts Hun An ATS instrument Instrument Audio Analyzer panel ChA Input Analog Ch B Measurement Function Ampude zv Range lV v rl Detfauto RMS BP BR Fit Freq aul ions reo mj Pd References dBr
77. velopment Process Chapter 7 GPIB Configuration Avoiding accidental EEPROM failure Your ATS 2 stores system information and calibration constants in a non volatile EEPROM memory circuit with the instrument It is possible to accidentally change or erase the data stored in the EEPROM memory The loss of this data could cause your instrument to perform out of specification behave erratically or even fail entirely Accidental EEPROM erasure is rare but it can be caused by simultaneous use of both the APIB and GPIB buses which can occur when you are changing operation from one control bus to the other To prevent EEPROM erasure when switching control buses you should always follow these orders of operation APIB to GPIB changeover 1 Exit the ATS 2 control software ATS then disconnect the APIB cable 2 Select GPIB operation using the rear panel switch and proceed with GPIB operation GPIB to APIB changeover 1 Select APIB operation using the external switch on the ATS 2 rear panel 2 Connect the APIB cable launch the ATS 2 control software ATS and proceed with APIB operation The GPIB cable can safely remain connected during APIB operation m Devices may be connected in a star or linear configuration see Figure 29 or a combination of star and linear configurations m Do not attach more than 15 devices including the controlling computer to one bus m Cable length between devices must not exceed 2 meters
78. wer cord from a mains power outlet to the power cord connector on the instrument rear panel Fuse Information The power entry module accommodates two fusing arrangements as il lustrated in Figure m The North American fusing arrangement uses a single type 3AG 0 25 x 1 25 SB slow blow fuse m The European fusing arrangement uses two 5x20 mm IEC approved type T fuses Refer to the label on the rear panel for fuse current ratings Changing the Fusing Arrangement To replace a fuse or change the fusing arrangement proceed as follows m Remove the mains power cord from the power cord connector and open the Power Entry Module as described above m Using narrow pliers pull the fuse assembly out of the housing Jumper bar i S Fuse 100 120 V Orientation 230 240 V Orientation Figure 6 Fuse Block Orientation for North American 100 120 V and European 230 240 V operation m Change or add the correct fuses as necessary referring to Figure 6 Refer to the instrument rear panel for the correct fuse electrical current rating m Insert the fuse assembly in the housing with the side of the assembly that carries the fuse s for your desired fusing arrangement facing into the housing Press the fuse assembly firmly into the housing 12 Getting Started with ATS 2 Connecting ATS 2 to Your PC Chapter 2 Installation and Setup for APIB m Confirm that the line voltage selection is correct for your mains vo

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