Agilent 5991-3278EN Multi-Channel Audio Test using the Keysight U8903A Audio Analyzer - Application Note c20 free download

File name 5991-3278EN Multi-Channel Audio Test using the Keysight U8903A Audio Analyzer - Application Note c20

Keysight Technologies Multi-Channel Audio Test using the Keysight U8903A Audio Analyzer For Instrument Control PC for Power post-analysis supply Switch for Audio analyzer DUT channels (2 channels) expansion Application Note Introduction Test requirements for car radio, CD receivers, and other devices such as GPS and entertainment systems are growing increasingly stringent. Manufacturers are expected to perform these multi-speaker and multi-channel tests while increasing throughput--without compromising test quality. This paper provides a solution for increasing overall production throughput and meeting these multi-channel testing requirements. Designed for today's automotive audio needs, the solution uses the Keysight Technologies, Inc. U8903A audio analyzer together with the Keysight 34970A/34972A data acquisition (DAQ) switch unit and the 34904A 4 x 8 switch matrix plug-in module. Challenges The U8903A provides two analyzer channels yet manufacturers are required to measure multiple channels of various parameters such as voltage, dynamic range, and THD+N. To meet industry's test requirements and maintain production throughput, this testing can require six to eight channels. For example, consider the following scenario. The required testing of car speakers typically includes multiple speakers. Various parameters for the front and rear, and right and left side speakers must be tested simultaneously. More than two channels are needed to perform such testing and prevent the creation of a bottleneck in daily production output. Solution To expand the number of channels on the U8903A, a switch can be used. This switch changes the signal from the device under test (DUT) and sends the data to the audio analyzer and then a computer for post-analysis. The cover graphic shows a typical test configuration to expand the number of channels being tested simultaneously. 03 | Keysight | Multi-Channel Audio Test using the Keysight U8903A Audio Analyzer - Application Note Four-channels testing using the U8903A and Keysight VEE Software Figure 1 shows this solution's typical test setup for audio testing. In this example, the DUT is a car's audio playing standard test tones. To expand the number of channels that can be tested and support