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Keysight U8903A Demo Manual

Audio analyzer
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Keysight Technologies
U8903A Audio Analyzer
Creating a Custom Filter for the
U8903A Audio Analyzer
Demo Guide

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Summary of Contents for Keysight U8903A

  • Page 1 Keysight Technologies U8903A Audio Analyzer Creating a Custom Filter for the U8903A Audio Analyzer Demo Guide...

  • Page 2: Table Of Contents

    Ordering Information and Related Literature Demonstration objectives This demonstration will teach you how to create your own custom filter for the Keysight Technologies, Inc. U8903A Audio Analyzer by using the MATLAB software on your computer. Steps to create a custom filter Follow the steps below to create your own custom filter for the U8903A.

  • Page 3: Step 1: Matlab Fdatool (Filter Design And Analysis Tool)

    Step 1 Matlab fdatool (Filter Design and Analysis Tool) Instructions Start MATLAB program (Figure 1) In the command window, type “fdatool” to start Filter Design and Analysis Tool in MATLAB (Figure 2) Figure 1. MATLAB command window Figure 2. Filter Design and Analysis Tool...

  • Page 4: Step 2: Create Filter

    Create filter Instructions Click on “Set quantization parameter” (Figure 3) Select “Single-precision floating-point” because the architecture of the U8903A is 32 bits (Figure 4) Return to the Design Filter page (Figure 4) Figure 3. “Set quantization parameter” icon Figure 4. Selecting “Single-precision floating-point” and “Return to the Design Filter page”...

  • Page 5: Select The "Response Type" E.g. Lowpass, Highpass, Bandpass, And Bandstop (Figure

    Instructions Select the “Response Type” e.g. Lowpass, Highpass, Bandpass, and Bandstop (Figure 5) Select the “Design Method” e.g. IIR or FIR (Figure 5) Select the “Frequency Specifications” you require e.g. Fpass (1 and 2), Fstop (1 and 2) (Figure 5) Requirements for Frequency Specifications: –...
  • Page 6 Instructions The “Order” number (see Figure 6) must be less than 256 in order to meet the architecture of the U8903A Audio Analyzer. Changing the “Design Method” will change the order number. Figure 6. Order number must be less than 256...

  • Page 7: Step 3: Export Filter Coefficient

    Step 3 Export filter coefficient Export filter coefficient information to a file (figure 7) Instructions Go to “File”, then select “Export...” At “Export To”, select “Coefficient File (ASCII)” Click on “Export” button, and Save to *.fcf file The Filter Coefficient Data File will then be displayed Figure 7.
  • Page 8 Export filter coefficient as an object for analysis (Figure 8) Instructions Go to “File”, then select “Export...” At “Export To”, select “Workspace” At “Export As”, select “Object” At “Variable Names”, for “Discrete Filter”, enter “Hd”, then click the “Export” button The Hd object is then in the MATLAB window Figure 8.

  • Page 9: Step 4: Settling Time (Delay)

    Step 4 Settling time (Delay) Knowing the settling time of your filter You can know the settling time for your filter by creating a 20 Hz Sine Wave for testing the filter you just created using the MATLAB software Instructions In the MATLAB command window 1.
  • Page 10 Step 4 Applying filter to the 20 Hz Sine wave Instructions In the MATLAB command window Type in the code below to apply filter to 20 Hz sine wave (Figure 11) : – fil=filter(Hd,xn); Objects filter is now created in MATLAB Type in the code below to plot the result: –...

  • Page 11: Step 5: Transfer To .Juf File

    Step 5 Transfer coefficient data to *.juf file Instructions Information transfer and saving as a .juf file: Name the *.juf file with a suitable title and bandwidth Select Type (IIR or FIR) Confirm Delay (Settling Samples) Confirm Sections Confirm Filter Coefficient Data Design methods There are different ways to transfer the Filter Coefficient data depending on the Design Methods (IIR or FIR) Instructions...
  • Page 12 For the IIR Design Method, the transfer to .juf is relatively more complicated compared to the FIR Design Method Instructions For Design Method IIR, enter the information below (Figure 15 and 16): ‘#Type: IIR” 2. ‘#Delay: ****” (From Settling Time/Delay) “#Sections:”...

  • Page 13: Step 6: Upload .Juf File To U8903A Audio Analyzer

    Step 6 Upload .juf file to U8903A Audio Analyzer (Figure 17 and 18) Instructions Copy .juf file to a USB pen drive Plug the USB pen drive into the U8903A Audio Analyzer Steps to upload to the U8903A Audio Analyzer Press “...

  • Page 14: Conclusion

    Due to differences in the testing environments and standards, general low pass filter, high pass filter, or weighting filter will only satisfy and fulfill some tests. Some users may require some custom filters in order to test DUTs. The U8903A Audio Analyzer provides users the capability to upload their own custom filter.

  • Page 15: Ordering Information And Related Literature

    Ordering Information For further information, refer to Keysight U8903A Audio Analyzer Quick Fact Sheet, Literature Number 5990-8504EN. Related Literature – Keysight U8903A Audio Analyzer, Data Sheet, Literature Number 5990-8499EN – Keysight U8903A Audio Analyzer, Quick Start Guide, Part Number U8903-90032 For the most up-to-date and complete application and product information, visit our product website at: www.keysight.com/find/audioanalyzer...
  • Page 16 United States (800) 829 4444 www.lxistandard.org LAN eXtensions for Instruments puts the power of Ethernet and the Asia Pacific Web inside your test systems. Keysight is a founding member of the LXI Australia 1 800 629 485 consortium. China 800 810 0189...

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