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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.
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