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Files for models SYS-2702, SYS-2712, SYS-2720, SYS-2722
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Software
AP2700 Control Software v3.30 (View previous versions)
AP2700 Control Software Compatible with all 2700 Series (2702, 2712, 2720, 2722)
Momentum DSP Filter Design Package
The Audio Precision Filter Design Package (APFDP) has been produced by Momentum Data Systems, Inc., to allow the user to create DSP filters for downloading to Audio Precision System Two Cascade hardware. The manual below explains the operation of APFDP. It is not intended to be a tutorial on digital signal processing, since there are many excellent texts on the subject, and it is assumed that the user has had a certain amount of academic or professional exposure to the subject. More advanced versions of this software are available, including versions enabling the design of finite impulse response (FIR) filters. These versions also support more powerful filter design techniques. Please call Momentum Data Systems for further information. Zip file contains APFDP manual (.pdf file) APFDP Executable application (.exe file) 4 sample test tiles (.spc file) Read me (.txt file)
Resources & Utilities
System Two Family Performance Check v1.20
System Two Family Performance Check macro for all System Two and 2700 Series instruments.
2700 & ATS-2 Resources Disc
The Audio Precision Resources Disc contains Sample Tests, the Performance Check and documentation to help you operate your AP2700 or ATS control software compatible audio analyzer. AP2700 or ATS control software is required. The installer includes both AP2700 and ATS-2 resources. You will be prompted to choose which components you wish to install.
AP2700 add-ins v3.30
Add-Ins are additional software features that can be seamlessly integrated into the AP2700 user interface. AP uses the standard Windows "Add/Remove Programs" exclusively to manage Add-Ins. Add-In Descriptions User Preferences -- Provides a user interface where you can set user preferences, define multiple preference groups and control how the preferences are applied to tests. Document Test Settings -- Creates an ASCII text file that documents selected panel settings for the current test configuration. Delete Traces-- Provides the capability to delete selected traces from the Graph / Data Editor. Sweeps that have any traces removed from view in the Graph are deleted.
2700 Series LabVIEW Driver v1.0.1
Audio Precision has developed a complete LabVIEW project-style instrument driver for IEEE 488.2 (GPIB) equipped models of the 2700 Series of audio analyzers. This driver supports NI LabVIEW 8.20.
2700 Series Windows APIB Drivers v1.0
Audio Precision's proprietary APIB interface bus requires the installation of the proper Windows driver software on your PC.
AES17 filter set bit macro
This AP Basic macro reads or sets the 2700 series instrument EEPROM firmware configuration to indicate the currently installed pre-analyzer filter. If you install or remove pre-analyzer filter hardware, you must set the EEPROM configuration for correct software operation. Requires AP2700 or APWIN version 2.24 or later control software.
Matlab Toolbox v3.2 (View previous versions)
Set of MATLAB functions for audio applications such as generating arbitrary waveforms and filters for 2700 and ATS-2
DIM measurement macro AP2700 v1
Accompanies KB article "DIM 30 and DIM 100 Measurements per IEC 60268-3 with AP2700"
User Manuals
2700 Series Getting Started v3.30
2700 Series User Manual v3.30
2700 Series User Manual
AP Basic Extensions for 2700 Series Instruments v3.30
SYS-2700A-M v0
SYS-2700A-M Windows Vista logo testing Getting Started Guide
USB-APIB Kit Installation and User Guide vRev 0
USB-APIB Kit Installation and User Guide
System Two Family Filter Installation Instructions
System Two Family Filter Installation Instructions
DCX User manual v1
AP Basic Language Manual v4 (View previous versions)
AP Basic Language Manual (previous versions titled: APWIN Basic User's Guide and Language Reference)
TechNotes/AppNotes
Technote 101: LabVIEW ActiveX Automation for Audio Precision Instruments
TECHNOTE 101 describes the basic principles and techniques needed to operate Audio Precision instruments using the instrument's Audio Precision control software as an Active X automation server within the LabVIEW environment. LabVIEW is a graphical programming development environment from National Instruments Corporation (NI). Engineers, scientist and technicians create virtual instruments (called VI in LabVIEW) to control and automate a wide variety of test and measurement instruments and to gather and manipulate the resultant test data. Although it is possible for LabVIEW to directly control GPIB versions of Audio Precision instruments, GPIB control of Audio Precision systems is not the subject of this TECHNOTE. Instead, TECHNOTE 101 deals with the capability of LabVIEW to control the standard APIB versions of Audio Precision PC-controlled instruments via the instrument control software, using Microsoft ActiveX automation.
Technote 102: Using Audio Precision HST v2.01
The AP High Speed Tester ( HST) application was originally developed to test playback only devices on the production line. The objective was a fast, accurate and easy-to-operate test station with a limited graphical user interface that just indicated the test results and had the ability to save results to a log file. In addition testing play-back devices, HST 2.0 can use the instrument's generator to drive the input of the device under test. Both input and output can be set to digital or analog, and limits, user prompts and sample rate can be defined easily via a new setup utility. This flexibility allows HST 2.0 to test almost any type of audio device - amplifiers, DACs, ADCs, signal processors, MP3 / DVD players etc. - quickly and easily.
Technote 103: Dolby Digital DVD Certification Tests v1.4 (View previous versions)
This Technote describes the use of a group of over 30 AP Basic macros that make Dolby Digital DVD testing quick and easy, using an Audio Precision analyzer system and input switcher. Both real-time Dolby Digital encoding (with Audio Precision's OPT-2711 Dolby Digital option) and DVD-Playback methods are supported. The macros and measurement results were designed to correspond to the organization of Dolby's DVD test results documents to help you gather most of the technical information you'll need for Dolby Digital DVD certification.
Technote 104: Introduction to the Six Basic Audio Measurements
Technote 104 discusses methods of making a set of basic measurements using an Audio Precision 2700 Series or ATS-2 audio analyzer.These are Level Frequency Response THD+N Phase Crosstalk Signal-to-Noise Ratio
Technote 27: Polarity Test Procedure vN/A
This utility determines the signal polarity between the Analog Generator Outputs and the Analog Analyzer Inputs. A common error in manufacturing of loudspeaker systems is to connect voice coils with reversed polarity. Even when all drivers in a multi-way system are phased correctly with respect to one another, it is possible to have the interior wiring to the external connection terminals of the cabinet reversed. An individual driver reversed will cause a dip in frequency response near the crossover frequency to the adjacent driver, since the two speakers are then producing acoustical output of nearly identical amplitudes but out of phase. An entire system wired out-of-phase would presumably be undetectable in a monaural application, but unacceptable in stereo systems. With minor adjustments, this procedure can be run as a stand-alone test, or it can be incorporated into other test setups. The procedure can test a single path, or it can test stereo channels. Equipment required is DSP or Dual-Domain version of System One, System Two, or System Two Cascade, and a microphone if you are testing acoustic paths such as loudspeakers.
Technote 29: Computing Group Delay from Phase Data Using APWIN vN/A
Group delay is a property of a device or a system: a plot of the change in phase of the response as a function of frequency; it is the negative derivative (slope) of the phase-vs-frequency characteristic of a device. Constant group delay across the frequency band means that all portions of a wideband signal arrive simultaneously. A pure time delay, equal at all frequencies, gives a level straight-line plot of phase versus frequency. In an audio component, this plot may vary with frequency, and the component is said to produce group delay distortion. Group delay is of interest to audio engineers, particularly in the design and test of low-pass filters used in digital audio and in loudspeaker design areas. For instance, an anti-aliasing filter will typically have a phase response curve which slopes sharply down at high frequencies. This means that the high-frequency components will be delayed longer in their passage through the filter, resulting in a loss of precision in musical transients and a more diffuse stereo image. It is possible to correct the group delay distortion of such filters by using an all-pass network, but this is seldom done in practice.
Technote 28: Measurement Microphone dBspl Calibration
This TechNote describes how to set up and use the dBr unit as dBspl. Automated AP Basic macros (procedures) are available to facilitate the calibration. These macros apply to the instrument analog analyzers. Additionally, two computational methods are described to help you understand the macros, and to help you calibrate a measurement microphone without the macros.
Technote 20: Return Loss Measurements
This Technote gives an overview of the concept of return loss in telephony. Return loss is an expression of the impedance mismatch in a transmission circuit which can give rise to reflection of signal energy. Sample hybrid circuits and their use in return loss measurements using Audio Precision instruments are described.
AP Applied: Dolby and dts Confidence Testing v1
Every device that bears a Dolby or dts logo is required to go through a compliance test process to insure that it meets the respective technical requirements. This AP Applied describes compliance testing using the APx585 with HDMI, utilizing features such as self-generated encoded test signals (closed loop testing), report generation, automation, and more. Testing examples are shown for an HD receiver and a disc player.
Legacy Material
Appnote 1: CD & DVD Player Tests using System One or System Two vN/A
This expansion and revision of the original Audio Precision Compact Disc Player Testing Application Note (AN-1) includes many new test techniques as well as refinements and improvements on the original tests. Test and procedure files supplied with this application note provide new convenience and ease-of-use for testing CD players using these instruments. Files created for both System One and System Two using APWIN are available. Also included are specialized and difficult tests such as distortion at low amplitudes, decoder linearity measured to below the Least Significant Bit, quantization noise, dynamic range, SMPTE and twin-tone (CCIF) intermodulation distortion and Wow and Flutter as an impulse noise test.
Technote 19: Create an HTML-Based Help System for APWin Basic Procedures vN/A
You can easily create an HTML-based help system to guide production technicians through APWIN Basic procedures. HTML, or HyperText Markup Language, is the language used by web browsers to format and display web documents. HTML-based help system files can be viewed by anyone with Internet or Intranet access, or they can be local files on a single computer. They can be updated at one location and can grow as your procedures grow. You can save files as HTML from word processors such as Microsoft Word 97, or you can use web development tools such as Dreamweaver or Front Page to create more sophisticated web-based help documents. It is possible to design robust interactive web-based help systems, including such features as displaying animated demonstrations, capturing and distributing information, using a database, and providing web-based training with audio, video, animations, etc.
Technote 21: Obtaining Frequency Response Measurements using an Audio Program as the test signal vN/A
The Audio Precision System Two's dual channel FFT signal analysis provides an alternate method of obtaining frequency response measurements. With power spectrum averaging of the FFT, the test signal can be regular audio program material. This ability to use music as the test signal can be useful in situations where conventional test signals would be annoying to listeners, such as in broadcasting or live performances. The only requirement for the source program is that it have sufficient energy, over time, at all frequencies in the bandwidth of interest. In other words a rock band or a symphonic orchestra would be a better choice than a single folk singer with a guitar.
Books
Measurement Techniques for Digital Audio v1
Much has been written about digital audio, its defining standards, the ever-changing hardware and software, the various applications in recording and broadcasting and telecommunications and the audibility of this or that configuration or artifact. In this book the late Julian Dunn focused instead on the measurement of digital audio signals, and examined in great detail techniques to evaluate the performance of the converters and interface through which the audio passes.
The Audio Measurement Handbook v1
This reference handbook is a practical, hands-on guide for workers in all phases of the audio field. It covers basic tools and techniques, common environments for audio testing, application of these techniques to common audio devices, the typical ranges of performance to expect in different devices, and a glossary of terms and key specifications used in audio measurement. 178 pages Written by Bob Metzler.
Whitepapers
Fundamentals of Modern Audio Measurement vN/A
Characterizing professional and consumer audio equipment requires techniques which often differ from those used to characterize other types of equipment. Sometimes this is due to the higher performance requirements. Other times it is due to the peculiarities of the audio industry. Other fields deal with some of the same measurements as those in audio. From level and THD to jitter and noise modulation, no other field has the breadth of requirements found in high performance audio.
Testing Challenges in Personal Computer Audio Devices vN/A
The Personal Computer audio environment has evolved over the years to become a significant entity within the field of acquisition and rendering of audio information. The personal computer is a highly sophisticated interactive environment that is much more complex than a conventional dedicated home audio device, leading to new problem areas. These include, but are not limited to, stochastic interrupts, network accesses, disc I/O and disparate hardware qualities. While the environment of a highly matrixed multi-tasking concurrent operating system offers many opportunities to overcome quality issues, the PC, due to the media-rich tools and feature sets, is becoming the entertainment capture and rendering device of choice for future generations. Presented at the 114th Convention, 2003 March 22–25 Amsterdam, The Netherlands. Wayne Jones, Michael Wolfe, Theodore C. Tanner Jr., Daniel Dinu
Datasheets
2700 Series Specifications v007
Complete specification for 2700 Series audio analyzer Keywords: 2700 spec specs
High Speed Test in Production & Broadcast v2
High Speed Tester (HST) is a fast, accurate and easy-to-operate audio test application that is ideal for high speed production test or testing transmission quality across a broadcast network.
Sample files
Complex Impedance AP Basic macros v2 (View previous versions)
Complex Impedance AP Basic macros (includes PDF of the Measuring Complex Impedance article)
2700 Series Crest Factor test v1
File configured to measure crest factor. See knowledge base article for complete explanation.
I2S jitter measurement test for the SYS-2722 v1
This file accompanies the knowledge base article "I2S jitter measurement with the SYS-2722." It demonstrates how to measure digital interface jitter using the digital unbalanced input of the instrument.
Get all FFT Bins v1
Illustrates setting up the sweep panel to return all FFT bins. For 2700 Series and ATS-2. The macro includes a function that gets the Sample Rate and FFT length, and in addition to setting up the sweep panel, it retrieves the FFT level spectrum in units of Volts.
FFT Scaling for Noise Macro v1
AP2700 macro and test file to accompany the KB article "FFT Scaling for Noise."
Contains several functions that are useful for performing calculations on FFT spectra, including FFT spectrum integration with window correction. There is also a subroutine that will convert a measured FFT spectrum to amplitude spectral density in dB relative to 1.0 V/√Hz, or FS/√Hz, and plot it on the graph.
Service & Support
AP2700 v3.3 MLS Quick Launch macro fix v1
Resolves an error with the MLS Quick Launch macro in AP2700 v3.3. When the MLS Quick Launch icon is clicked, and then the sweep Go button is clicked, the following message is displayed: "Error 18020: Channel 1 De-emphasis overload detected" Unzip this file, and save the two resulting files in the "My Documents\Audio Precision\AP2700 3.30\Quick Launch" directory, replacing the ones currently there. This will fix the problem.
Translated Material
Technote 102 - Japanese
Technote 102 - Japanese - Using AP QuickTest
Technote 103 - Japanese
Technote 103 - Japanese - Dolby Digital DVD Certification Tests
AES17 - Japanese - Manual
AES17 - Japanese - Manual
2700 Getting Started Manual - Japanese
2700 Getting Started Manual - Japanese
Measuring Switch-mode Power Amplifiers - Japanese
Measuring Switch-mode Power Amplifiers - Japanese
2700 - Manual - Japanese
2700 - Manual - Japanese
AUX-0025 Data Sheet Chinese
AUX-0025 Data Sheet - Chinese
2700 series Leaflet - Chinese
2700 series Leaflet - Chinese
Technote 102: High Speed Test (Korean) v1
High Speed Tester (HST) is a fast, accurate and easy-to-operate audio test application that is ideal for high speed production test or testing transmission quality across a broadcast network. Translated into Korean by AP Partner B&P International
Technote 103: Dolby Digital DVD Certification Tests (Korean) v1
Technote describing how to work with AP instruments for Dolby Digital certification. Translated into Korean by AP Partner B&P International
2700 Series Getting Started Guide (Korean) v1
2700 Series Getting Started Guide (Korean) Translated into Korean by AP Partner B&P International
