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Chapter 3

Hardware Overview

The ATS-2 hardware includes input and output connectors, ranging and

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
specifications, 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 9, includes the digital and

analog inputs and outputs and a power indicator.

Getting Started with ATS-2

15

Digital Output

Digital Input

Analog Inputs

Power Indicator

Analog Outputs

Figure 9. ATS-2 front panel.

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Содержание ATS-2

Страница 1: ...Getting Started with Your ATS 2 ATS 2 ...

Страница 2: ......

Страница 3: ...Getting Started with ATS 2 An Introductory Guide to ATS 2 APIB and GPIB Configurations ...

Страница 4: ... 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 Tel 503 627 0832 Fax 503 641 8906 US Toll Free 1 800 231 7350 email info audioprecision com Web audioprecision com Printed in the United States of America Copyright Ó 2001 2004 ...

Страница 5: ... for ATS 2 5 Filter Design Package Manual 5 Other Publications 5 GPIB Documentation for ATS 2 5 Chapter 2 Installation and Setup for APIB 7 ATS 2 Components 7 Getting up and Running 8 Installing ATS Software on a PC 8 PC System Requirements 8 Installing the Software 8 Setting Up the ATS 2 Hardware 9 Connecting ATS 2 to the Electrical Mains Supply 9 Checking the Mains Supply Voltage Configuration 1...

Страница 6: ...TS Workspace 20 ATS Panels 21 Panel Settings 22 Panel Readings 22 ATS Menus 23 File Menu 23 Edit Menu 23 View Menu 23 Panels Menu 23 Sweep Menu 23 Compute Menu 24 Macro Menu 24 Utilities Menu 24 Window Menu 24 Help Menu 24 Status Bar 24 Toolbars and Buttons 25 Standard Toolbar 25 Panels Toolbar 25 Macro Toolbar 25 Learn Mode Toolbar 26 Quick Launch Toolbar 26 Using Files with ATS 26 Test Files 26 ...

Страница 7: ...7 Quick Guide to the FFT Spectrum Analyzer 38 Real Time vs Batch Mode Instruments 38 The FFT Concept 39 Setting up an FFT 39 Panel Fields 40 Time vs Frequency 40 Quick Sweep Setup 40 Fine Tuning the Display 41 Saving and Loading Tests 42 The Next Step 42 Chapter 6 Specifications 43 Chapter 7 GPIB Configuration 57 Introduction 57 APIB or GPIB 57 The GPIB Software Development Process 58 Using both G...

Страница 8: ...iv Getting Started with ATS 2 ...

Страница 9: ...f 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 required 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 Installatio...

Страница 10: ...quipment refer to the Operator s Manual or User s Manual for precautionary instructions FUNCTIONAL EARTH TERMINAL A terminal marked with this symbol 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 symbol is bonded to conductive parts of th...

Страница 11: ... standard equipment rack using optional mounting hardware 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 2000 and Windows XP With the exception of the mains power switch on the rear panel there are no knobs dials controls readouts meters or swit...

Страница 12: ...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 ATS 2 can perform measurements using fast Fourier transform FFT analysis Advanced high speed FFT analysis techniques are available including multitone recogniti...

Страница 13: ...ioned and then digitized by a high resolution analog to digital converter ADC before being applied to the analyzer An optional high bandwidth ADC is available to increase measurement bandwidth Conceptual Architecture of ATS 2 Chapter 1 General Information Getting Started with ATS 2 3 Analog Domain vs Digital Domain Analog audio signals are electrical analogies of the sound waves that they represen...

Страница 14: ...l then press the F1 function key 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 f...

Страница 15: ... of Momentum Data Systems QEDLite filter design package This special version creates filter files in the format used by ATS The Filter Design Package manual describes the operation of this software Other Publications Audio Precision publishes application notes tech notes technical papers and training materials that cover all aspects of audio test and measurement Information about our library of te...

Страница 16: ...Chapter 1 General Information Other Documentation for ATS 2 6 Getting Started with ATS 2 ...

Страница 17: ...ting Started with ATS 2 The ATS 2 User s Manual An Audio Precision Interface Bus APIB interface card as ordered 1 An APIB interface cable The ATS control software CD ROM containing the ATS measurement software and documentation files The Tones and Tests CD ROM containing audio test tones and sample files We recommend that you retain the shipping box and packing materials to protect your instrument...

Страница 18: ... An open PCI or PCMCIA slot to mount the APIB interface card At least 30 MB of free hard disk space as much as 100 MB if all utilities documentation and sample files are to be installed A color monitor and a video card with at least VGA capabilities Video resolution of 1024 768 is recommended You will also need signal interface cables to connect ATS 2 to your device for testing Since there are man...

Страница 19: ...pected voltage at their intended destination The voltage setting and fusing arrangement will normally 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...

Страница 20: ...n the Power Entry Module refer to Figure 3 and proceed as follows Remove the mains power supply cord from the power cord connector 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 d...

Страница 21: ...dge 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 Confirm that the correct fuse or fuse combination is installed for the intended input voltage refer to the fuse ratings marked on the instrument rear panel If necessary change the fuse type as des...

Страница 22: ...escribed above Using narrow pliers pull the fuse assembly out of the housing 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 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 assem...

Страница 23: ...n APIB interface cable and with the interface option you ordered Refer to the appropriate section for your interface below Installing a PCI APIB Card To install the PCI card use the following procedure Turn off your computer remove the cover and install the PCI APIB interface card in an open PCI bus slot Remember to handle the card properly to minimize static electricity discharges while installin...

Страница 24: ...o adapters one for an ISA slot and one for a PCI slot Please contact Audio Precision Technical Support for details or visit the Audio Precision Web site To install the PCMCIA card use the following procedure Install the PCMCIA adapter and drivers if necessary by following the instructions supplied with the adapter Insert the PCMCIA card into the PCMCIA interface Connect the APIB cable between ATS ...

Страница 25: ...onfiguration 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 Pane...

Страница 26: ...he 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 connections are mounted on the rear panel POWER ENTRY MODULE this module includes POWER SWITC...

Страница 27: ...rpose Interface Bus functionality to ATS 2 If your ATS 2 is configured for GPIB see Chapter 7 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 AUDIO MONITORS The source connectors monitor the signal currently being analyzed The function connectors monitor the function meter in the ...

Страница 28: ...Chapter 3 Hardware Overview ATS 2 Rear Panel 18 Getting Started with ATS 2 ...

Страница 29: ...out the ATS 2 GPIB configuration 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 instrument panels where the cor...

Страница 30: ...oose this option to invoke 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 Retry Choose this option if you have since connected the hardware and powered it up Exit Choose this option to exit the software If you have chosen to run the software ATS will start up and...

Страница 31: ...rkspace 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 showing 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 effect For example you can set a signal s output voltage and frequency on the generato...

Страница 32: ...u 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 Custom buttons which have a special function such as GO ON OFF and so on 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 key...

Страница 33: ...u provides editing commands The standard Windows editing 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 Butto...

Страница 34: ...tone 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 Help Menu 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 t...

Страница 35: ... of the ATS 2 User s Manual for more information Standard Toolbar The Standard toolbar gives you quick access to ATS file printer and editing operations as well as Sweep Stop Start and Sweep Spectrum Waveform switching Panels Toolbar The Panels toolbar gives you quick access to commonly used ATS panels The panels are also available from the Panels menu Macro Toolbar The Macro toolbar offers operat...

Страница 36: ...he 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 custom setup as a test ATS saves the instrument and sweep setup information the input and output configuration and ...

Страница 37: ...a 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 e...

Страница 38: ...d set up on the Configuration panel and is discussed 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 described in Appendix D of the ATS 2 User s Manual The filename extensions for downloadable filter files are AP downloadable lowpass f...

Страница 39: ...ware is launched the default workspace is loaded with three panels labeled Analog Generator Analog Input and Analyzer To return to this configuration at any time click the New Test button 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 or via an ...

Страница 40: ...llows you to filter the audio signal and measure parameters such as total harmonic distortion 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 13 Analog generator channel A producing a 1 V 1 kHz sine wave Analog generator channel...

Страница 41: ... tone Controlling the Analog Generator The topmost two fields in the Analog Generator panel control the generator 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 wi...

Страница 42: ...e Sine Normal waveform 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 verify the frequency in each channel by referring to the frequency meters on the Analyzer panel Units Settings and readings...

Страница 43: ...ile 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...

Страница 44: ...om 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 ins...

Страница 45: ...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 20 Hz then 6680 Hz then 13340 Hz and finally 20 kHz That is the difference between successive frequency settings is 6660 Hz Data Display R...

Страница 46: ... units are Volts Change the units to dBV by clicking on the arrow next to the Top field From the list choose the dBV 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 yo...

Страница 47: ...rowser button and choose Analog Generator as the instrument and ChA Amplitude as the setting Change the Start value for Source 1 to 100 µV ATS understands the prefix u to stand for µ Choose the dBg A units for Data 1 by clicking on the arrow next to the Top field and choosing the dBg A line from the list The dBg A units decibels relative to generator channel A show the ratio of the reading to the ...

Страница 48: ...sweep readings from the audio analyzer are diverted from the panel meters to the sweep engine for graphing After the sweep the readings 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...

Страница 49: ...ere will be in the result and hence the higher the resolution will be However longer acquisitions take more time 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 Transformation The windowed audio data is transformed by the FFT This results in an array of points de...

Страница 50: ... 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 harmonic 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 directly to the analog input Choose FFT Spectrum Analyz...

Страница 51: ...he distortion on the waveform is not visible in the time domain You can switch between the time domain and frequency domain displays 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 examine features of the acquired waveform Zoom On the graph draw a box by holding down the left mouse button and movi...

Страница 52: ...utton in the Standard toolbar To load a lest choose File Open 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 audio signals in different ways The ATS 2 User s Manual describes all the instruments in detail We have also introduced the swee...

Страница 53: ...y Range 2 Hz 61 6 kHz SR 131 072 kS s 1 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 N2 20 Hz 20 kHz 0 0009 101 dB 1 6 µV Variable Phase Range 180 00 to 179 99 deg Dual Sine Ratio Range 0 dB to 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 Ti...

Страница 54: ...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 ref...

Страница 55: ...d Crosstalk 100 dB 3 µV 20 Hz to 20 kHz Digital Signal Generator Waveforms Sine Family Normal Var Phase Stereo Dual Shaped Burst EQ Burst Offset IMD SMPTE DIN 4 1 1 1 Square Noise Arbitrary Waveform Multitone Special Polarity Pass Thru Monotonicity J Test Walking Ones Walking Zeros Constant Value Random Common Sine Family Characteristics Frequency Range 2 Hz to 0 50 SR Frequency Resolution SR 223 ...

Страница 56: ...a maximum amount of data induced jitter on low bandwidth transmission links Walking Ones A single binary one value walked from LSB to MSB Walking Zeros A single binary zero value walked from LSB to MSB Constant Value Digital DC 32 bit resolution when using triangular dither Random Random binary states of all bits Arbitrary Waveform Multitone Sample Rates SR 65 536 kS s 131 072 kS s OSR programmed ...

Страница 57: ...tput Amplitude balanced into 110 W Range 0 to 5 10 Vpp Resolution 20 mV Accuracy 10 60 mV Output Amplitude unbalanced into 75 W Range 0 to 1 275 Vpp Resolution 5 mV Accuracy 8 15 mV Output Amplitude Optical Toslink 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 sour...

Страница 58: ...dependent 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 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 40 dB Digital 100 dBFS S N 40 dB Phase Measurement Measurement Ranges 180 90 to 270 or 0 to 360 deg Chapter 6 Specifications 48 Getting Started with ATS 2 4...

Страница 59: ...o 0 45 SR no filters selected Residual THD N Analog 0 0009 101 dB 1 6 µV with 20 kHz LP Digital 138 dBFS Minimum Input for Counter Tuning Analog 1 mV S N 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 THD N Filters One filter from each of the following 3 groups may be enabled for 3 filters total Low Pass Gro...

Страница 60: ...nalog 10 Hz to 5 kHz 0 5 µV 124 dBu 5 kHz to 20 kHz 1 0 µV 118 dBu 20 kHz to 50 kHz 2 0 µV 112 dBu Digital 150 dBFS SMPTE DIN IMD Function Test Signal Compatibility Any combination of 40 Hz to 250 Hz LF and 2 kHz to 0 45 SR HF mixed in any ratio from 1 1 to 5 1 LF HF IMD Measured Amplitude modulation products of the HF tone Measurement bandwidth is typically 20 Hz to 750 Hz Measurement Range 0 to ...

Страница 61: ...Range 4 of input frequency 7th FFT bin low limit to 0 45 SR high limit Spurious Products 120 dB Residual Distortion Analog 105 dB SR 65 kS s 90 dB SR 262 kS s with performance option Digital 180 dB Analog Alias Rejection Standard High Resolution A D typically 115 dB for signals 0 554 SR Performance option A D typically 85 dB for signals 0 540 SR Multitone Audio Analyzer Acquisition Length 512 to 3...

Страница 62: ... to 5 6 Vp ranges 80 dB 10 Hz to 20 kHz 11 2 Vp to 200 Vp ranges 50 dB 10 Hz to 1 kHz Input Related Crosstalk 100 dB 3 µV at 20 kHz Digital Input Characteristics Formats Balanced XLR AES3 per AES3 1997 Unbalanced BNC SPDIF EIAJ per IEC 60958 Optical Toslink per IEC 60958 3 Sample Rates 28 8 kHz to 108 kHz per connector Word Width 8 to 24 bits Input impedance Balanced XLR Nominally 110 W or 2 5 kW ...

Страница 63: ...layed 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 W or 5 kW Lock Range 0 0015 15 PPM Auxiliary Signals Monitor Outputs Signals Replicas of both analyzer inputs plus two additional sig...

Страница 64: ...ernal 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 Syn...

Страница 65: ...afety 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 Cha...

Страница 66: ...Chapter 6 Specifications 56 Getting Started with ATS 2 ...

Страница 67: ...fitted in the reserved space on the ATS 2 rear panel as shown below 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 57 ERR MAV LA TA SRQ GPIB GPIB IEEE 488 2 GPIB 4 0 1 2 1 8 16 APIB ADDRESS RL1 PP0 DC1 DT1 C0 E2 SH1 AH1 T6 TE0 L4 LE0 SR1 Headphone Jack APIB Auxiliary Con...

Страница 68: ...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 21 illustrates a typical software development scenario in which the Audio Precision ATS measurement software is used to develop expertise with the ATS 2 before attempting to integrate the inst...

Страница 69: ...l 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 22 illustrates this for the ATS 2 Analog Generator panel The GPIB Software Development Process Chapter 7 GPIB Configuration Getting Started with ATS 2 59 Define the Test System HW SW Learn ATS 2 using ATS software ATS software...

Страница 70: ... interface card on the controlling computer to the port on ATS 2 and select GPIB on the rear panel switch as shown in Figure 23 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 disconnected from the APIB interface card in the computer Chapter 7 GPIB Configuration The GPIB Software Development Proc...

Страница 71: ...mmunication 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 mechanical requirements of IEEE 488 1 1987 The instrument is connected to the instrument controller via an appropriate cable The instrument controller a computer must have a corresponding GPIB interface port Standard GPIB cables are design...

Страница 72: ... bus Chapter 7 GPIB Configuration The GPIB Software Development Process 62 Getting Started with ATS 2 Figure 25 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 Figure 26 APIB controller connections ATS 2 with GPIB option in APIB control mode Computer APIB cable connec...

Страница 73: ...h ATS 2 63 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 erasur...

Страница 74: ...rface 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 impedance state and enables APIB to control the ATS 2 Chapter 7 GPIB Configuration The GPIB Software Development Process 64 Getting Started with ATS 2 STAR CONFIGURATION COMBINATION STAR AND LINEAR CONFIGURATION LINEAR CONFIGURA...

Страница 75: ...y the GPIB controller 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 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...

Страница 76: ... 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 EOI line asserted with the NL character ASCII 10 the linefeed character Chapter 7 GPIB Configuration The GPIB Software Development Process 66 Getting Started with ATS 2 ...

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