All APx515 instruments use the same APx500 measurement software. However, some features require that different software options be installed on the analyzer. Therefore, not every download displayed here will work with every APx515.
AP specifications in hard copy booklets & brochures can be out of date. The specifications documents available for download from our Web site have the most current and correct information. If there is a conflict between printed and online specifications, the online version is the prevailing document.
Resources for API developers. Includes VB.NET and C# templates and example code, C++ examples, LabVIEW examples, and the APx Wavereader dll. Documentation includes Intro to Programming the APx500 API and the APx API Browser. The APx LabVIEW driver is a separate download.
Included in this download:
Introduction to Programming the APx500 API
API Browser application
A guide to using the APx500 API, updated for the current version.
The APx LabVIEW Driver is a collection of Virtual Instruments (VIs) that provide LabVIEW users with most of the functionality available in the APx500 Application Programming Interface (API) using high level, LabVIEW-typical subVIs. With the driver, you can quickly and efficiently develop APx applications with clean, concise LabVIEW code. Please note that the LabVIEW Driver is specific for each release of APx500. Requires LabVIEW 2010 or higher.
The LabVIEW DAQ Driver for APx515 communicates directly with APx515 hardware and does not utilize the APx500 measurement software or API. Its functionality is similar to NI DAQmx, making it possible to upgrade an existing test system that uses DAQmx to utilize the APx515 with reduced effort. Requires LabVIEW 2012 or later, and VIPM 2014 or later for installation.
If you are looking for a LabVIEW driver that communicates with the APx500 software through the APx500 .NET API, then download the APx LabVIEW .NET Driver instead.
IronPython is a version of Python that can interface with .NET Assemblies. This download includes an APx Project and a Python code sample that controls APx500 via the APx API.
An Agilent VEE example that opens APx500, makes settings, and runs an acquisition. For more details about controlling APx500 using VEE, read the associated kb article. After downloading, open in a text editor and modify the .NET references to refer to your current version of APx500.
The WaveReader DLL provides functions that can be called from an external program, to enable transfer of acquisition data from an APx analyzer to that program in near real time. Any .NET compliant language such as C#, VB.NET, or LabVIEW can make use of it.
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A two-page overview of the APx500 Series audio analyzers, including summary specification comparison tables.
Two page datasheet describing the APx500 software, including standard features and measurements along with additional software options.
The APx515 is a high performance audio analyzer optimized for production test. It is a best-in-class instrument for its speed, performance, automation, and ease-of-use.
A single sheet description of APx Electro-Acoustic software options, including Thiele-Small characterization, Rub & Buzz detection and Loudspeaker Production Test.
Datasheet for APx PESQ and POLQA software options
APx500 measurement software for all APx Series instruments.
This download is suitable for most users. If Microsoft .NET version 4.5 is not already on your PC, it will be downloaded during the installation.
For PCs that do not have .NET version 4.5 installed, and are not connected to the Internet, download the full installer instead (APx500 Measurement Software (with .NET)) NOTE: .NET 4.5 does not support Microsoft Windows XP.
APx500 Measurement Software for all APx Series instruments.
This download includes the Microsoft .NET Framework version 4.5, and is suitable for installation on PCs that are not connected to the Internet and do not already have version 4.5 installed. NOTE: .NET 4.5 does not support Microsoft Windows XP.
For installation on Internet connected PCs, download APx500 Measurement Software instead.
This download contains the release notes for the current version of APx500 measurement software. Additional information can be found in the What's New
USB driver update for users of APx500 v2.3 - 3.4 running on Windows Vista, 7, and 8. Apply this update if you encounter the following symptoms:
1) During installation of APx500 you receive one or both of the following warnings:
- User Account Control (UAC) warning: “Do you want to allow the following program from an unknown publisher to make changes to this computer?”
- Windows Security warning: “Windows can’t verify the publisher of this driver software.”
2) APx500 fails to recognize an attached APx analyzer (runs only in demo mode).
Download this update and run it after installation of APx500 and then power-cycle the attached APx analyzer.
Describes using LabVIEW with APx in a lab or automated production environment. Examples using the APx LabVIEW virtual instrument driver are shown.
A look at some of the important features needed in an acoustic audio analyzer, the problems you may encounter in non-ideal testing environment, the needs of good production line testing, and the range of measurements and results that should be produced.
Cost benefit analysis of high performance, low price audio test equipment in production.
Explains the various ways to view, measure, and manipulate digital metadata, primarily over the HDMI interface.
In collaboration with Dolby engineers, Audio Precision has developed APx-based test solutions, available to Dolby licensees, to support both the Dolby Digital Plus™ Consumer Decoder SDK and the MS11 Multistream Decoder SDK. In the case of Dolby Digital Plus, compliance testing includes well over 1,200 individual measurements which, if performed manually, could easily take over a week. The APx solution reduces that time to hours. More importantly, because APx generates the test sequence with all appropriate limits, there is no time wasted on recreating a test methodology or deciphering test requirements. Since Dolby MS11 also supports Dolby Digital Plus, this application note primarily focuses on the MS11 SDK test solution.
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
In this technote, we discuss how to test the analog sound quality of FM radio receivers using an Audio Precision APx500 Series audio analyzer. We also discuss how to test the Radio Data System (RDS), which allows text, such as song title and artist, to be transmitted digitally as part of the analog radio signal.
In this technote we describe and compare two different methods to measure PSRR. Then we give instructions for using the APx PSRR Measurement Utility, which simplifies the calculations and graphing on APx analyzers.
This technote is included in the APx PSRR Measurement Utility download.
Describes how to measure the sound pressure level developed by portable audio players and their associated headphones, according to British Standard / European Norm 50332. Also shown is how to use the APx Portable Audio Player / Portable Headphone Test Utility to facilitate making the necessary measurements with an APx500 analyzer.
Performing the described tests requires that you download the APx Portable Audio Player / Headphone Test Utility. This Technote is also included in that download.
This Technote discusses the techniques necessary to perform the “Basic Six” audio measurements on consumer-level PC audio devices. This category includes sound systems integrated into notebooks, netbooks, tablets, and PC motherboards, as well as expansion cards and some external devices. It doesn’t include USB-connected headsets, nor pro-audio devices with balanced input and output connections.
Includes APx project and .wav test signal files for playback
Addresses conversion of tests and procedures/macros written using AP’s Windows based APWin, AP2700, or ATS software to APx500. If you are using AP’s DOS based S1.EXE software for System One, please refer to Technote 109 instead.
This Technote discusses techniques for testing the audio performance of USB headsets using an Audio Precision APx analyzer. Includes APx projects and wave files.
Acoustic sounds or noise in the environment is typically measured with a handheld sound level meter. This Technote explains some of the theory behind such measurements, and how to make them instead using an APx analyzer. Using the analyzer adds the capability to perform spectrum analysis, and to visualize the character of the sound signal over time. The latter is especially valuable when measuring non-steady state sounds, such as a pulsating alarm. Requires the APx Sound Level Meter Utility, available as a separate download, to make the measurements.
Describes how to test microphone preamplifier phantom power, with and without simultaneous audio. You may instead download the "APx Phantom Power Measurement Project," which runs the tests (that download also includes this Technote).
Making noise measurements of microphone preamplifiers (and other high-gain circuits) involves special techniques that differ from those used to measure low-gain devices. This technote explains the theory as well as how to make these measurements.
Technote 121 describes the PESQ and POLQA Perceptual Audio test models, how they are implemented in APx, and when each is appropriate to use. Brief contextual comparison to STI (Speech Transmission Index) is also provided. Please also see the Technote 121 supplemental file, which includes additional POLQA and PESQ information provided by Opticomm GmbH.
Enabling high-channel count, high-quality audio transport via Ethernet, the Dante protocol is being designed into a growing number of pro-audio products and systems. However, testing Dante-enabled devices can present some unique challenges. Our latest technote delves into this application and walks through two example test scenarios using APx500 Series audio analyzers.
This TechNote discusses STI measurement, including the different methods identified in IEC 60268-16, a brief comparison of STI versus PESQ and/or POLQA perceptual audio testing, and finally a full discussion of STIPA method-based measurements using an APx500 Series audio analyzer and Audio Precision's STI measurement plug-in.
This Technote examines the automated test capabilities built into the APx500 measurement software, with emphasis on features recently added in release v4.2 to support production test of electro-acoustic devices. TN129 also provides a practical example, specifically the configuration of APx for production test of loudspeakers, and includes discussion of "golden units" (reference devices), input equalization, multiple sequences in a single project, and Production Test mode.
APx FM MPX-RDS Waveforms 50µs (except North America) contains a series of FM multiplex and RDS encoded waveforms for FM radio receiver testing with the APx Series analyzers. The test streams are versions of the stereo .wav files that can be created with the Audio Precision Waveform Generator Utility (WfmGeneration.exe), also available for download.
Copy the folder to your PC and load the desired file using the generator waveform browser inside the APx500 application. Download Technote 105: FM Radio Receiver Testing with APx Audio Analyzers for a discussion on FM testing.
APx FM MPX-RDS Waveforms 75µs (North America) contains a series of FM multiplex and RDS encoded waveforms for FM radio receiver testing with the APx Series analyzers. The test streams are versions of the stereo .wav files that can be created with the Audio Precision Waveform Generator Utility (WfmGeneration.exe), also available for download.
Copy the folder to your PC and load the desired file using the generator waveform browser inside the APx500 application. Download Technote 105: FM Radio Receiver Testing with APx Audio Analyzers for a discussion on FM testing.
A comprehensive set of MP4 video files with audio encoded in AAC, Dolby Digital 2.0, Dolby Digital 5.1, and Dolby Digital Plus 5.1 formats. Accompanies Technote 116: Testing Smartphones and Tablets, which is a separate download.
APx Smartphone and Tablet Audio Test Files is also available.
The full track listings for all APx test signal discs – APx-BD1, APx-DVD1, and APx-CD1. These discs may be ordered from Audio Precision.
Alternately, the linear test signals may be created using the APx Waveform Generator Utility (available as a download), and the Dolby and dts encoded versions may be downloaded as "APx Dolby Generator Waveforms" and "APx dts Generator Waveforms" respectively.
User manual for APx500 measurement software. Includes detail on signal path setup, hardware connectivity, and software features for all APx models: APx515, 520, 521, 525, 526, 585, 586, and 555.
Integrates APx with AudioGraph’s Active Loadbox for automated and comprehensive power amplifier load measurements. Requires the Active Loadbox hardware for use.
An overview of the measurement principles and detailed usage instructions is contained in the KB article: Measuring Power Amplifiers with Reactive Loads.
A barcode scanner may be useful in production testing, not only to expedite data entry, but to eliminate the possibility of initiating the wrong test routine. The APx Barcode Scanner Interface is a small VB.net application (Run_Barcode_Project_ID.exe) that automatically loads an APx project who's name matches the barcode data.
An APx project that creates reports in Bode Plot format. Requires APx500 v3.2 or later.
This utility creates sine burst waveforms and then saves them and/or uploads them into the APx generator. Burst waveforms can be useful in testing a number of properties, including power supply transient response and reserve, meter ballistics, and compressor/limiter behavior.
For use with the APx Sound Level Meter Utility. See the associated KB article on Click and Pop Measurement for full discussion and instructions.
The APx Damping Factor Measurement Utility plots audio amplifier damping factor vs. frequency.
The version number of this utility must match the version of the APx500 software that you are running.
The APx EQ .wav Files Utility lets you apply equalization to generator source .wav files. When given an original .wav file and an EQ curve file, it creates a new EQed .wav file. Includes both graphic interface and command line versions. The utility is useful to EQ PESQ generator files for a given stimulus speaker. Download includes instructions. Note that any version of APx500 may be used with this utility, and version numbers do not correspond to APx500 versions.
This utility allows you to calculate post equalization THD on-the-fly. The utility operates from the command line (no user interface) and is called during an APx project by adding a Program step to the sequencer. Includes complete instructions and project file.
Converts FFT spectra to fractional octave spectra. Includes instructions which discuss the theory behind the conversion.
A simple APx project file to demonstrate testing of FM transmitters and receivers, including automotive head units. Includes a set of MPX-RDS-encoded sweeps and tones.
This utility can create a file containing a multiplexed and RDS encoded waveform of stereo sine waves, and upload it to the APx500 measurement software. Accompanies Technote TN-105, "FM Radio Receiver Testing with APx Audio Analyzers."
These files can be used with APx500 v2.7 or later to create equalized sweeps or equalized multitones.
Included are RIAA, FM 50uS, and FM 75uS emphasis and de-emphasis curves.
Measures jitter at the receiving end of an AES3/SPDIF connection by using a special J-test stimulus signal and analyzing the analog output spectrum. Displays graphs showing the FFT spectrum, the jitter spectral density, and the integrated jitter, in addition to a total jitter value. Tools are included for manipulating the graphs, exporting data, and printing.
Download includes the utility, J-test stimulus waveforms, and instructions. The utility version must match the version of APx500 that you are running.
APx mixing console sample project with instructions. Requires any APx instrument.
The output impedance of a device can easily be calculated by measuring its output voltage with and without a known load attached. The APx Output Impedance Measurement Utility simplifies the procedure by calculating and graphing the results. See the accompanying knowledge base article for an explanation and instructions.
The version number of this utility must match the version of the APx software that you are running.
Power Supply Rejection Ratio (PSRR) is a measure of a device’s ability to reject noise from the supply used to power it.
Download includes the utility and TechNote 106: Measuring Power Supply Rejection Ration (PSRR). The utility version must match the version of APx500 that you are running.
Allows measurement of phantom power on a microphone preamplifier, with and without a simultaneous audio signal. Requires a special Phantom Power Test Fixture, described in Technote 114: Measuring Phantom Power (included).
The APx Polar Plot Utility is a Windows application for making polar measurements of loudspeakers or microphones with an APx500 audio analyzer and for creating 2-dimensional polar dispersion plots from the measured data. The APx Polar Plot utility also requires the SPK or SPK-RD software option to be installed on the connected APx audio analyzer. If you require a SPK-RD software option, please contact your Audio Precision sales representative.
Tests portable audio players and headphones packaged as a set, and as individual components, for compliance with the BS EN 50332 standard. Works with any APx Series analyzer. The version of APx500 software must match the utility version. Includes Technote 107 with full instructions.
APx power amplifier (linear) sample project and instructions. Requires any APx instrument.
This utility allows you to post process .csv files saved by the APx Measurement Recorder measurement and return the results to a CSV file and optionally to an APx Defined Result. It operates from the command line (no user interface) and is called during an APx project by adding a Program step to the sequencer. A sample project file is included to demonstrate its usage and how to import results data into an APx Defined Result.
Five different computations may be performed:
1. Return Frequency of Derived Result Max function (GetMaxDRFreq)
2. Return X/Y Trace comparison (Compare)
3. Data restructuring (AppendsToResult)
4. File deletion (DeleteFile)
5. Trace positioning based on defined trigger (Trigger)
This zip file contains an APx project file named "PT-Demo External Loopback.approjx" that illustrates many of the production test and automation features added in release v4.2 of the APx500 measurement software. The project file focuses on an electro-acoustic application, specifically loudspeaker test. The file also contains a 15-page presentation describing how to use the demonstration project.
The APx Repeat Selected Measurement Utility allows you to continuously repeat any selected APx500 measurement. This is useful when adjusting a device, circuit, or component on the bench and you want to monitor changes as you make them in real time.
Download includes installer and instructions. The utility version must match the version of APx500 that you are running.
3.3 is the last version of this utility. Repeat capability is already included in Bench mode in APx500 v4.0 and later.
The files created while doing "Tutorial A: Making a Custom layout from the Default layout" in the APx500 program Help. Use these files if you wish to skip Tutorial A and proceed with Tutorials B and C.
This APx project and related files demonstrates how to run an external program from APx500. Includes THD+N measurement and Stepped Frequency Sweep measurements. The project file calls the Goldwave audio editor program, so you will either need to install Goldwave, or substitute another audio player with a command line interface. Accompanies the kb article "Running an external program from APx500," which gives a complete explanation.
For designers of public address, flight recorder and police/fire/emergency communications systems, the APx Speech Transmission Index (STI) plug-in is a software add-on for the APx500 that provides a STIPA measurement and Speech Level measurement conforming to international standard IEC 60268-16 (2011).
NOTE: The STI plug-in is a software option and requires the purchase of an iButton (APX-SW-STI) for measurement functionality. Download and installation of the plug-in, without an iButton, enables the measurement in demo mode only. The APx STI plug-in requires v4.2.1 or later of APx500 audio test software.
Automated self test for all APx instruments. Run this test to confirm proper operation and before sending an instrument in for service.
Allows an APx500 Series Analyzer to measure acoustic noise or sound in the environment, taking the place of a handheld sound level meter. Using the analyzer adds the capability to perform spectrum analysis, and to visualize the character of the sound signal over time. The latter is especially valuable when measuring non-steady-state sounds, such as a pulsating alarm. Technote 113, included, describes the theory and how to use the utility.
This project measures loudspeaker impedance using the constant voltage method.
Complete instructions and explanation are in the KB article "Measuring Loudspeaker Impedance Using APx Derived Measurement Results".
An external sense resistor is required for this project. The "APx Speaker Impedance Measurement Utility," also available for download, can utilize the built-in source resistor in APx analyzers.
This utility for APx analyzers allows you to make an impedance vs frequency sweep across a loudspeaker, and then see the graph and data results directly in ohms. Clicking Help in the utility will display the complete instructions, including a discussion of the theory behind it. It can utilize the built-in source resistor on APx analyzers to make impedance measurements.
NOTE: This utility is only compatible with APx500 Software v3.3 or earlier. For users with APx500 v3.4 or later, options APX-SW-SPK-RD and APX-SW-SPK-PT provide a range of acoustic measurements, with SPK-RD including Thiele-Small characterization. An impedance-only alternative is also available for download and is compatible with APx500 v3.4 and later – please see the APx Speaker Impedance Measurement Project. This project requires an external sense resistor and uses the constant voltage method.
Splice is a CLI utility that combines separate LF and HF measurements into a single full frequency response result.
Produces a separate trace for each harmonic H2 through H10 (can be extended to H20), as both a level and as a ratio, and displays them all on one graph. Each harmonic can easily be enabled or hidden. Makes use of the Export Data and Import Data steps in the automated project sequencer. I/O connectors and measurement bandwidth should be set in Signal Path Setup before running. This project will open in APx500 v3.0 or later.
This APx utility facilitates testing of small loudspeakers according to requirements of the South Korea Telecommunications Technology Association (TTA) Standard number TCB-0054(00), “TTA Verified Testing Criteria for Micro/Slim Speakers” using an Audio Precision APx500 Series audio analyzer.
Note that the version of this utility must match the version of APx500 that you are using it with.
The APx500 CSD Utility is a Windows application for making a Cumulative Spectral Decay (CSD) plot, sometimes referred to as a waterfall plot, from the measured impulse response of a loudspeaker. The APx CSD utility also requires the SPK-RD software option to be installed on the connected APx audio analyzer. If you require a SPK-RD software option, please contact your Audio Precision sales representative.
The APx Waveform Computes Utility extends the capabilities of APx500 by making Fast RMS (root mean square) measurements. Additionally, it utilizes Fast RMS for a number of useful tasks: audio/video synchronization, dropout detection, and pop/click detection. Download includes utility, instructions, and example project file.
The Waveform Generator Utility (APxWfmGenerator.exe) allows you to generate .wav files for a wide range of test signals, with selectable sample rates, bit depths and channel counts.
You are free to copy this utility to other computers or media, where you can generate the audio files you may need for external source testing.
Note that the version number of this utility does not correspond to APx500 software versions and APx500 is not required.
Enables an APx500 audio analyzer to measure wow and flutter, according to standard “AES 6-2008—Method for Measurement of Weighted Peak Flutter of Sound Recording and Reproducing Equipment” (IEC 60386 Weighted). Includes an FFT of the demodulated waveform, as well as an unweighting option.
Set of MATLAB functions for audio applications such as reading and writing waveforms and filters for 2700, ATS-2, and APx
Discusses writing and reading good audio specifications. Guidelines are provided, then key specifications for two classes of audio device are examined for correct expression and form, with examples of real-world specs for comparison.
Switch-mode audio power amplifiers are becoming increasingly popular due to their smaller size, lower weight, and improved efficiency. Their advantages are obvious in low power battery operated personal audio players and laptop computers. However they are also progressively displacing more traditional linear designs in mainstream applications such as home entertainment systems, automotive sound systems, and professional installations where high quality audio is important. Measuring the performance of switch-mode amplifiers presents some new and unique challenges. They inherently generate ultra-sonic artifacts and spurious signals with slew rates that can provoke non-linear behavior within the input stages of high quality audio test and measurement equipment. Absolutely worthless and inaccurate results can result unless effective measures are taken to prevent this non-linear behavior. Written by Bruce Hofer.
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.