Application Note
Contents
1. THD N Total harmonic distortion plus noise Crosstalk 1 2 3 4 Phase 5 6 SNR Signal to noise ratio Note Connect the device under test DUT to the U8903B audio analyzer before running the test sequence In this example the phase and crosstalk require two channels for measurement so the DUT needs two input and output channels TSA Project Test1 OaS Status Project able Test 1 Add Test THD N SNR Sequence 10 Configuration 3 AC Level Phase 1 A Stepped Freq Sweep Crosstalk Properties Figure 2 Creating a standard test sequence with default settings 04 Keysight Automatic Audio Test for Design Verification and Production using the U8903B Audio Analyzer Application Note Modifying Default Settings and Test Report Content In this step we modify the settings of IO Configuration and each measurement It is assumed that you are familiar with the U8903B input and output configuration and know how to set each measurement in the test sequence If you are not please read the U8903B User Manual for detailed operating instructions Modify the setting of IO Configuration Use Arrow to highlight IO Configuration and press Enter to access the IO Configuration interface Here you can modify the Output Configuration audio generator and Input Configuration audio analyzer Use Arrow to switch between Output Configuration and Input Configu2. sequence main screen press Arrow to the Project tab on the top of screen and press Properties to input the pass and fail messages Identifying DUTs The U8903B can show the DUT s name product name or model number at the start of the test sequence This helps users to identify which DUT they are testing with the test sequence Conclusion Automated testing is considered complicated costly and time consuming Test engineers may spend days on programming and even need to use graphic programming tools like Labview or VEE Additional hardware costs for PCs and GPIB cards also are required The Keysight U8903B test sequence function changes this situation Any test engineer even if they know nothing about PC programming languages or programming tools can create a simple automated test in a few minutes with no additional hardware required This function is especially useful in design verification test hardware qualification test and production test 06 Keysight Automatic Audio Test for Design Verification and Production using the U8903B Audio Analyzer Application Note myKeysight LX WARRANTY myKeysight www keysight com find mykeysight A personalized view into the information most relevant to you www lxistandard org LAN eXtensions for Instruments puts the power of Ethernet and the Web inside your test systems Keysight is a founding member of the LXI consortium Three Year Warranty www key
3. Keysight Technologies Automatic Audio Test for Design Verification and Production using the U8903B Audio Analyzer Application Note KEYSIGHT TECHNOLOGIES Introduction The Keysight Technologies Inc U88903B test sequence function provides users with a flexible and easy to use interface making it quick and convenient to create automated test sequences Most automated test programs can be created in just a few minutes without the need to know PC programming languages or other development tools and all of the operation can be done using the U8903B s front panel The test sequence function can Implement a series of measurements in a predefined sequence There is no limit to the number of measurements Test time duration is correlated to the number of defined measurements the more tests the longer the test time Customize the setting of each measurement to suit your application Set the limit of each measurement result and make FAIL PASS judgments automatically Generate test reports automatically and export them as Microsoft Word docx documents for file management and use in design verification test hardware qualification and production test Save a test sequence as a file for use by other U8903B audio analyzers This application note demonstrates how to create a test Sequence using the Keysight U8903B The test sequence example consists of six commonly used audio measurements that are widely u
4. hange from Enable to Disable and the tick mark next to Gain will disappear Press Return to go back to the test sequence on the main screen Continue modifying each of the settings for the other measurements to suit your test application and indicate what content to included in the test report The main screen of U8903B should look like Figure 4 Test 1 10 Confligur 10 Configuration Input Configuration Output Configuration Analog References 2 600 00 Q UnBal 600 Q Float 22 600 Vrms Settings Analog Settings References 2 387 30 mV UnBal 0 0000 dB 100 kQ 0 0000 Hz AC 600 00 Q 90kHz 1 0000 mVrms 94 000 dBSPL Figure 3 Modified setting of IO Configuration Project Test1 SNR Project Test 4 THD N m IO Configuration 3 AC Level m Phase 1 4 Stepped Freq m Sweep Crosstalk 2 t Channels Connector Impedance KS Coupling Bandwidth 1 5MHz References Return aes e Status Enable Add Measurement Delete Measurement Edit Settings Properties Figure 4 Modify the default setting and test report content to fit your measurement requirement 05 Keysight Automatic Audio Test for Design Verification and Production using the U8903B Audio Analyzer Application Note Setting FAIL PASS Measurement Limits In production test or design verification test engineers want to set a limit to the test results If the test result exceeds t
5. he limit the FAIL sign appears for this measurement This PASS FAIL judgment provides convenience for the test engineers especially if there are hundreds of measurements in the test sequence Setting these limits is very easy For example to set limits for the AC Level measurement use Arrow to highlight the AC Level tab on the top of the screen Press Edit Limits and select Upper Limit and or Lower Limit to set the AC Level limits The default setting enables all limits Running the Test Sequence and Generating a Test Report Press ON OFF to run a test sequence and choose from one of three ways to run the test sequence Start Test App this runs the entire test sequence you just created Start Test App from Here this starts running the test from the measurement that you have highlighted This is useful when you just want to run part of the test sequence Start Selected Measurement This only runs one measurement which is determined by what you highlight After the test sequence is finished a test report is generated automatically From the main test sequence screen use Arrow to access the Report tab on the top of the screen Now you can read the first page of the test report Press Arrow down to read the beginning of the first page and use the scroll knob to read the rest of the page Press Arrow right to access other pages You can export the test report to an external USB
6. parameters of each measurement use default settings 1 Press Menu on the front panel Use Arrow to highlight Test Seq App in the menu and press Enter to select the test sequence function 2 Use Arrow to highlight IO Configuration Press Add Measurement which highlights AC Level and press Enter to select the AC Level measurement item On the U8903B screen the AC Level measurement will be added under IO Configuration 3 Repeat Step 2 above to add the following measurements frequency response THD N phase crosstalk and signal to noise ratio Note that the U8903B uses Stepped Freq Sweep in place of Frequency Response and it is the same as the frequency response measurement 4 Use Arrow to highlight Test 1 under Project Press Status to enable the test sequence The status will change from Disable to Enable and a tick mark will appear near Test 1 and each of the measurements Once completed the U8903B display should look like Figure 2 indicating that you have set up a test sequence with six measurements At this stage all measurements as well as IO Configuration use default settings Next these settings must be checked and the parameters configured to suit your test requirements Table 1 The example test sequence consisting of six basic measurements Measurement Item AC level Amplitude Sequence Stepped frequency sweep Frequency response
7. ration Check the current settings and use the softkeys to modify the parameters to suit your test application For example the default setting of Input Configuration is 4 channels To change it to 2 channels for our measurement use Arrow to highlight Input Configuration press Channels and select 2 in the pull down menu The number under Channels will change from 4 to 2 The display of the U8903B screen should look like Figure 3 Modifying Measurement Settings and Test Report Content Modify measurement settings Press Return to go back to the test sequence main screen Use Arrow to highlight the AC Level measurement Press Settings to modify the AC Level measurement Check the current setting and use the softkeys to modify specific settings to suit your test application Repeat the above step to modify the settings of the other five measurements Modify the test report content After finalizing the configuration of the measurement use Arrow to highlight the AC Level or Gain tab on the top of screen On the U8903B screen a tick mark will appear next to AC Level or Gain This means the test results of AC Level or Gain will be included in the test report If this value does not need to be included on the test report press Status to disable the test result For example if the test result is not wanted on the test report press Status Status will c
8. sed to test consumer and professional audio devices broadcast devices and internet audio The sequence includes measurements for level frequency response THD N phase crosstalk and signal to noise ratio see Figure 1 Throughout this application note bold text is used to indicate keys on the instrument Text in refers to softkeys presented on the instrument s screen Project Test 1 AC Level Project Test 1 a IO Configuration THD N Measurement Delete 3 Measurement AC Level m Phase Edit 1 4 Stepped Freq m Crosstalk Settings Sweep 2 Properties Figure 1 A test sequence example consisting of six audio measurements 03 Keysight Automatic Audio Test for Design Verification and Production using the U8903B Audio Analyzer Application Note Process Overview There are four basic steps to creating a test sequence 1 Create a standard test sequence with default settings 2 Modify the default settings and default test report content to fit your measurement requirements 3 If desired set the FAIL PASS judgment limits for each desired measurement result 4 Run the test sequence and generate a test report To illustrate this process the following sections explain how to create a test sequence consisting of the six basic measurements shown in Table 1 Creating a Standard Test Sequence with Default Settings The initial step is to create a standard test sequence consisting six measurements The
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10. thumb drive The document is an Microsoft Word document docx and includes date and time stamps on each page of the report Using Other U8903BF Test Sequence Function Features Sharing test sequences Test sequences can be created on any U8903B unit and shared with other U8903B units From the test sequence main screen press Arrow to the Project tab on the top of the screen Press Save Project to save the test sequence as a file into internal memory or to an external USB thumb drive Press Open Project to load the test sequence from the external USB thumb drive Using a Project or Test A large test sequence called a Project can be divided into many sub test sequences called Test This is a convenient way to manage your automated tests Normally the audio input output configurations are complicated different channels different connectors different impedance float grounding etc Switching between different input output configurations is time consuming and impacts test speed The U8903B test sequence packs measurements with the same input output configuration into one test making the automated tests fast and easy to manage Customizing PASS FAIL messages The U8903B provides more than just PASS FAIL judgment it displays a Pass Message or a Fail Message This message can be customized to provide instructions about what actions to take if the measurement is passed or failed From the test
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