Keysight Technologies U8903B Manuale utente

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

Press [Menu] > {Standard View}

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

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.

Published in USA, December 1, 2017

5992-0667EN

www.keysight.com

www.keysight.com/find/u8903b

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