audio testing, HST, AP2700, Thurlby Thandar Instruments Ltd
High speed audio testing against limits
News Release from:
Thurlby Thandar Instruments Ltd
18 February 2008
The AP High Speed Tester (HST) application is now available for use with the Audio Precision AP2700 Series audio analyser. The new 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 displayed just test results and had the ability to save results to a log file.
The initial success of HST prompted many customers to request the same functionality for testing other devices: a request that has now been answered by Audio Precision.
HST is an ideal application for customers looking for high-speed production test: parameters such as DC offset, output level, frequency response, phase, distortion, noise in the presence of a signal, and crosstalk are all measured in just six seconds.
The key to the speed of HST is the use of a multitone stimulus which allows HST to derive all its measurements from a single acquisition. HST provides single-value results for each measurement, but also allows the user to view the FFT spectrum of the acquisition.
In addition to testing playback 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 analogue, 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.
HST can be also be used in other areas, including the testing of broadcast transmission networks using a one-second multitone to trigger HST automatically and measure transmission quality.
The Audio Precision 2700 Series is designed for audio engineers who need the highest performance, lowest distortion and greatest flexibility possible in an audio analyser, and currently has the best performance of any audio analyser in the world.