Keysight Technologies U8903B User manual

Keysight Technologies
U8903B Analog Audio Analyzer
Demo Guide

02 | Keysight | U8903B Analog Audio Analyzer – Demo Guide
Demonstration Preparation .............................2
Demo 1. Performing Basic Audio Measurements ............3
Demo 2. Generating a Frequency Response Plot Using
the Sweep Function ...................................4
Demo 3. Performing Spectrum Analysis Using the
FFT Graph Function and 1.5 MHz Bandwidth Option .........5
Demo 4. Combining Tests Using the Test Sequence
Application...........................................7
Related Literature .....................................9
The following hardware and license congurations on the
Keysight Technologies, Inc. U8903B audio analyzer are
required in order to perform the demonstrations provided in
this application note:
Item Notes
U8903B-STD option Two analog generator channels plus two
analog analyzer channels
N3431A option 1.5 MHz wide bandwidth
U8903B rmware revision 3.2.3.0 and above
(Press the [System] button to check
Firmware revision)
BNC cable Optional to connect from generator to
analyzer
In the demonstration instructions, keystrokes surrounded by [ ]
represent front panel keys of the instruments, while keystrokes
surrounded by { } represent soft-keys (refer to Figures 1a and 1b).
The use of > indicates a series of keystrokes.
Table of Contents
Figure 1a. Front panel hardkeys 1b. Functional softkeys
Demonstration Preparation

03 | Keysight | U8903B Analog Audio Analyzer – Demo Guide
Objective
– Perform the basic audio measurement functions such as
frequency, Vac, THD+N ratio, and SINAD. (A maximum of four
measurement functions can be turned on and viewed on the
U8903B front panel.)
Instructions Keystrokes
Set the U8903B to its default
settings
Press [Preset]
Select {To Factory Settings}
Select “Yes” by pressing [Enter]
Select {Return}
Select the generator Select the generator window by
pressing [ ] or [ ]
Press [1] to select generator AG1
Generate 1 kHz, 1 Vrms tone
(see Figure 2)
Select {Waveform Cong} > {Amplitude}
Press [1] > {Vrms} > {Return}
Toggle the [ON/OFF] button to ON
Set the frequency to 1 kHz if needed
(the default is 1 kHz)
Select {Return}
Demo 1. Performing Basic Audio Measurements
Figure 2. 1 kHz, 1 Vrms generation
Figure 3. Analog analyzer measurement
Instructions Keystrokes
Set the analyzer to perform the
four measurements
Highlight the analyzer window by
pressing [ ] or [ ]
Press [1] to select analyzer AA1
Set up measurement function
No. 3
Select {Function} > {Function No}
Press [ ] to select {3} > [Enter]
Select {Meas Func}
Use [ ] and select {THD+N Ratio}
Select {Unit} > {%} > [Enter]
Set up measurement function
No. 4
Select {Function} > {Function No}
Press [ ] to select {4} > [Enter]
Select {Meas Func}
Use [ ] and select {SINAD}
Press [Enter]
Select {Return}
Set analyzer input
(There are two options
to do this)
Option 1. Use a BNC cable Connect Channel 1 on the generator to
Channel 1 on the analyzer
Option 2. Loopback internally Select {Input Cong} > {Connector} >
{Loopback} > [Enter] > {Return}
Turn on the analyzer channel Toggle [ON/OFF] to ON
Refer to Figure 3 for results

04 | Keysight | U8903B Analog Audio Analyzer – Demo Guide
Demo 2. Generating a Frequency Response Plot Using the Sweep Function
Objectives
– Plot a frequency response graph using the U8903B Sweep
function.
– Use U8903B’s capability to plot up to four different charts.
Instructions Keystrokes
Go to the Sweep
Function menu
Press [Sweep]
Set Channel setting Use [ ] and select {Settings}
Select {Channel} > {Source} > {1} > {Measure} >
{1} > {Return}
Set the AG1 Use [ ] and select the AG window
Ensure it is set to AG1, if not:
Select {Waveform Cong} > {Amplitude} > [1] >
{Vrms} > {Return}
Ensure the amplitude is set to 1 Vrms
Set the AA1 Use [ ] and select the AA window
Ensure it is set to AA1, if not, press [1]
Change Function 2 to THD level measurement
Select {Function} > {Function No}
Press [ ] and select 2 > [Enter]
Select {Meas Func}
Use [ ] and select {THD Level}
Press [Enter] > {Return}
Start the sweep
function
Toggle [ON/OFF] to ON
To view the various plot
chart results
Select {Plot Settings} > {Y Data}
Use [ ] or [ ] to select the required plot
Notes
– Sweeping will start immediately and change to plot view
when completed.
– Refer to Figures 4 to 7 for results.
– To get back to the plot view from the Sweep menu, select
{Plot View}.
Figure 4. AC voltage vs. frequency
Figure 5. THD level vs. frequency
Figure 6. THD ratio (%) vs. frequency
Figure 7. SINAD vs. frequency

05 | Keysight | U8903B Analog Audio Analyzer – Demo Guide
Demo 3. Performing Spectrum Analysis Using the FFT Graph Function and
1.5 MHz Bandwidth Option
Objectives
– Use the FFT graph (frequency domain) functions and the
1.5 MHz analysis bandwidth option.
– Use the marker function to search to fundamental and
harmonics.
– Use the zoom function.
Instructions Keystrokes
Go back to the Standard View
menu
Press [Menu] > {Standard View}
or
Press [Generator/Analyzer]
Turn on the AG1 and AA1 Select the AG1 window and toggle
[ON/OFF] to ON
Select the AA1 window and toggle
[ON/OFF] to ON
Switch to Frequency
Spectrum mode
Press [Graph]
The FFT graph shown in Figure 8 should
appear
Toggle [On/Off] button to ON
Perform AutoScale (optional)
to get the graph to properly
t into the display (Refer to
Figures 8 and 9)
Press [Scale] > {AutoScale} > {Return}
Make peak measurement
using the FFT graph
Press [Peak Search] > {Max Peak}
Select {Return}
Notes
– The M1 measurement result is shown in Figure 10.
– Trying to perform {Next Peak} might not yield result because
the threshold upper limit setting is too high.
Instruction (optional) Keystrokes
To reduce the upper threshold
limit
Press [Peak Search] > {Threshold}
Select {Peak Thes} > [+/-] > [1] > [3] > [0]
> [Enter]
Select {Return}
Figure 8. FFT plot (before AutoScale)
Figure 9. FFT plot (after AutoScale)
Figure 10. Peak search on FFT graph

06 | Keysight | U8903B Analog Audio Analyzer – Demo Guide
Instructions Keystrokes
Turn on the 1.5 MHz-wide
analysis bandwidth to view
more harmonics
Press [Generator/Analyzer] to go back
to the Standard View menu
Select the AA1 window > {Input Cong}
Select {Bandwidth} and change it to
{1.5 MHz} (as shown in Figure 11)
Go back to FFT graph Press [Graph]
Change the X axis (Frequency)
to view
Select {Axis Settings} > {Right} >[1] >
{MHz} >{Return}
Increase the FFT sample size
for better resolution
Select {Graph Settings} >{Sample Size}
> {524288} > {Return}
Note
– The acquisition rate will slow down after increasing the
sample size (refer to Figures 12 and 13).
Figure 12. FFT with 32768 sample size
Figure 13. FFT with 524288 sample size Figure 14. Zoom function and display
Instructions Keystrokes
Turn on the zoom function
(shown in Figure 14)
Press [Zoom]
Press [Shift] > [Zoom] to adjust the zoom
window
Turn the knob to adjust the zoom ratio
(the size of the red square window)
Use [ ] or [ ] to move the zoom window
To go back to FFT graph press [Zoom]
Note
– The U8903B screen is split into two windows in the zoom
view. The top window is a normal graph window, and the
bottom window displays a magnied representation of the
traces in the top window.
Figure 11. 1.5 MHz analysis bandwidth

07 | Keysight | U8903B Analog Audio Analyzer – Demo Guide
Demo 4. Performing Combined Tests Using the Test Sequence Application (TSA)
Objectives
– Use the TSA function to create a series (up to 20 test
sequences) of automated audio measurements.
– Add and combine two tests and execute them in sequence
without external programming scripts.
– Learn how to extract the test report and save it in a Microsoft
Word le.
Instructions Keystrokes
Go to the Test Sequence
Application menu
Press [Menu]
Use [ ] and select {Test Seq App}
Set the IO conguration Use [ ] and select {IO Conguration}
Press [Enter]
Set up Output conguration
(Figure 15)
Use [ ] and select {Output Conguration}
> {Channels}
Use [ ] to select {1} > [Enter]
Set up Input conguration
(Figure 15)
Use [ ]
Select {Input Conguration} > {Channels}
Use [ ] and select {1}
Press [Enter] > {Connector}
Use [ ] to change to {Loopback}
Press [Enter]
Select {Return} to go back to TSA main
menu
Instructions Keystrokes
Add frequency sweep
measurement (shown in
Figures 16 and 17)
Select {Return} to go to TSA main menu
Select {Add Measurement}
Use [ ] and select {Stepped Freq.
Sweep}
Press [Enter] or select {Settings}
Select {Waveform Cong} > {Amplitude}
Press [1] > {Vrms}
Press {Return} twice
Figure 15. Output conguration (top) IO conguration (bottom)
Figure 16. Add stepped frequency sweep
Figure 17. Stepped frequency sweep settings

08 | Keysight | U8903B Analog Audio Analyzer – Demo Guide
Instructions Keystrokes
Add stepped level sweep test
sequence (shown in Figure 18)
Select {Return} to go to TSA main
Select {Add Measurement}
Use [ ] and select {Stepped Level
Sweep}
Select {Return} to go back to the
TSA main
Instructions Keystrokes
Start the TSA test sequence Press the [ON/OFF] button
Select the {Start Test App}
Instructions Keystrokes
View the TSA test results Select the required test item (Stepped
Freq. Sweep)
Press [Enter]
Use [ ] or [ ] to scroll through the test
results as shown in Figure 20
Instructions Keystrokes
View the TSA test report
summary
Select {Return} to go to TSA main
Use [ ] or [ ] and select the {Report} tab
Use [ ] or [ ] to scroll through the
report pages as shown in Figure 21
Notes
– The TSA test report can be saved to an external data storage
device such as a USB thumb drive.
– The TSA report can be saved in Microsoft Word format.
Figure 18. Add stepped level sweep
Figure 19. TSA test completed
Figure 20. Stepped freq. sweep test results Figure 22. TSA report

09 | Keysight | U8903B Analog Audio Analyzer – Demo Guide
Related Literature
Keysight U8903B Performance Audio Analyzer, conguration guide
http://literature.cdn.keysight.com/litweb/pdf/U8903-90055.pdf
Keysight U8903B Audio Analyzer, user guide
http://literature.cdn.keysight.com/litweb/pdf/U8903-90045.pdf
Keysight U8903B Audio Analyzer, data sheet
http://literature.cdn.keysight.com/litweb/pdf/5991-4551EN.pdf
www.keysight.com/nd/u8903b

10 | Keysight | U8903B Analog Audio Analyzer – Demo Guide
This information is subject to change without notice.
© Keysight Technologies, 2015
Published in USA, December 1, 2017
5992-0667EN
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