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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 simultaneous parameter testing, the 34970A/34972A
                                                           DAQ/data logger switch and the 34904A 4 x 8 switch module are connected to the
                                                           U8903A using a customized cable to maintain a balanced connection: the U8903A-107
                                                           XLR-to-2-BNC connectors. An automated Keysight VEE program is used to capture the
                                                           frequency, AC voltage, and THD+N measurement of the test tone.




                           Figure 1. Typical audio testing setup using Keysight instruments


                                                           With this solution, four-channel testing is done using the following procedures:

                                                           1. Connect and power up the instruments shown in Figure 1.
                                                           2. Load the test tone CD-ROM in the car radio. In this example, two common test tones
                                                              are being tested that are usually performed at a manufacturing site:
                                                             

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