Tektronix SPECMON3, SPECMON6 User manual

x

SPECMON3 Real-Time Spectrum Analyzers
SPECMON6 Real-Time Spectrum Analyzers
Application Examples

ZZZ

Reference

*P071306500*

071-3065-00

xx

SPECMON3 Real-Time Spectrum Analyzers
SPECMON6 Real-Time Spectrum Analyzers
Application Examples

ZZZ

Reference

www.tektronix.com

071-3065-00

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Table of Contents

Preface ................................................................................................................................. ii

Application

Application 2: Measuring Channel Strength and Adjacent Channel Power.. . . .. . . ... . ... . ... . ... . ... . ... . ... . ... . . .. . . .. . . .. . . ... . 5

Application 3: Performing M odulation A nalysis . ... . ... . .. . . .. . ... . ... . ... . .. . . .. . ... . ... . ... . .. . ... . ... . ... . ... . .. . . .. . ... . ... . .. . . . 9

Applicatio

Application 5: Capturing Transient Signals . ... . ... . ... . ... . ... . ... . ... . ... . ... . ... . ... . ... . ... . ... . ... . ... . .. . . ... . .. . . .. . . .. . . .. . ..24

Application 6: Taking Pulse Measurements ......................................................................................... 34

1: Making a Basic Spectrum Measurement ... . . .. . . .. . . ... . ... . ... . ... . ... . ... . ... . ... . . .. . . .. . . .. . . ... . ... . ... . ... . ... 1

n 4: Performing Time and Frequency Analysis . . .. . . .. . . .. . . .. . . .. . . .. . ... . . .. . . .. . ... . . .. . ... . ... . . .. . ... . ... . ... . ... . .. 16

Table of Content

s

SPECMON3 & SPECMON6 Application Examples Reference i

Preface

Preface

This manual provides tutorial examples of how to use the SPECMON3 and SPECMON6 Real-Time Spectrum Analyzers to
take measurements in different application areas. To work through these examples on your instrument, you can use either
the sample data files provided on your hard drive or a live signal of your choice. If you use your own signal, you need to
reset the instrument to match your signal's parameters.

NOTE. You can use the mouse, keyboard, and touch screen to perform all of the tasks in this manual. Additionally, you can

use the knob and buttons on the analyzer front panel as shortcuts to perform some of the tasks.

ii SPECMON3 & SPECMON6 Application Examples Reference

Application 1: M

aking a Basic Spectrum Measurement

Application 1

You can operate y our analyzer like a conventional spectrum analyzer. The following example leads you through basic
functions of frequency, span, and shows y ou how to make amplitude and frequency measurements with markers.

1. Push the front-panel Preset button to set
the instrument to the default settings.

The following steps set up the appropriate
measurement parameters for the sample
signal.

2. Click Freq in the application menu bar
and type in 2GHz.

2 GHz is the frequency of the saved
signal that you will recall in a later step.
Enter the value with the front-panel
keypad or an external keyboard attached
through the USB port.

: Making a Basic Spectrum Measurement

3. Click the Settings icon in the application

menu bar.

4. Set the span to 1MHzin the resulting
Spectrum Settings lower screen pane.

To locate the Span screen item, be sure
the Freq & Span tab is selected.

5. Select File > Recall.

The file that you will recall is a saved
data file. It mimics a live signal for the
purpose of this example application.

6. Go to: C:/SPECMON
Files/SampleDataRecords.

Select Acq data with setup (TIQ) in the
drop-down list field.

Select FMDemo.tiq in the File name
field.

SPECMON3 & SPECMON6 Application Examples Reference 1

Application 1: M

Click Open.

NOTE. You can use a live signal of your own

choice instead of the sample data file and
reset the instrument to match your signal's
parameters.

7. Select Data only in the Recall
Acquisition Data dialog box and click
OK.

If you had previously stored both
instrument setups and your data, you
could recall both items now by selecting
Data and setup.

You should see the sample waveform on
the screen.

aking a Basic Spectrum Measurement

NOTE. Markers can help you measure

values like time, frequency, and power.

8. Click the Marker icon in the application

r to display the marker tool bar at the

ba
bottom of the screen.

Do this with a mouse, by pressing

escreenwithafinger, or push the

th
front-panel Markers Peak button.

2 SPECMON3 & SPECMON6 Application Examples Reference

9. Click Peak in the resulting marker toolbar

at the bottom of the display.

The instrument places a m arker on the
highest level peak of the spectrum. It
displays the marker measurement in the
upper left of the display.

The first marker is labeled MR to indicate
that it is the reference marker.

10. Click M arkers Define in the bottom left

of the display.

Application 1: M

aking a Basic Spectrum Measurement

This br ing
control panel.

11. Click Add.

A diamond shape labeled M1 appears o n
top of the
frequency. This is a delta marker.

The four delta markers, M1, M2, M3, and
M4, meas
referenced to MR.

You can also assign markers to specific
traces a

12. Use your finger or the mouse to slide the

marker over to the next signal.

Alternatively, you can do the same task
with the knob or arrow key on the front
panel. Do this by assigning the control
to the marker by touching the marker
toolbar at the bottom of the screen.

The marker readout at the upper right
shows the frequency and amplitude
differences between the reference
marker MR and the M1 delta marker.

The readout to the upper left shows the
absolute value of the M1 marker.

suptheDefine Markers

MR marker and at the center

ure amplitude and frequency

nd adjust peak threshold.

SPECMON3 & SPECMON6 Application Examples Reference 3

Application 1: M

So far, you used m arkers to measure two
points of the same trace.

You can also use markers to measure further
differences
by using the up, down, left, and right arrow
keys. You can also drag markers with the
mouse.

Alternatively, you can move markers by
rotating the front-panel knob or pressing the
front-pane

aking a Basic Spectrum Measurement

between points. You can do this

l arrow keys.

4 SPECMON3 & SPECMON6 Application Examples Reference

Application 2: M

easuring Channel Strength and Adjacent Channel Power

Application 2

: Measuring Channel Strength and Adjacent

Channel Power

The analyzer can take channel power, field strength, adjacent channel power, and multi-carrier channel power measurements.
This application demonstrates the settings used for taking channel power and field strength.

1. Push the front-panel Preset button to set

the instrument to the default settings.

Set up the appropriate measurement
paramete

2. Ensure th

rs for the sample signal.

at Freq is set to 1.5 GHz.

3. Click the Displays icon in the application

bar. Doing this will let you open the C han
Power/STR and ACPR display.

Alternatively, push the front-panel

Displays button.

4. Select the RF Measurements folder.

SPECMON3 & SPECMON6 Application Examples Reference 5

Application 2: M

easuring Channel Strength and Adjacent Channel Power

5. Double click or
drop, the Channel Pwr/STR & ACPR
icon in the Available displays area to
move it to the S

6. Double click
Spectrum icon to remove it from the
Selected displays area.

7. Click OK.

8. Click the

bar.

, alternatively, drag and

elected displays area.

, or drag and drop, the

Settings icon in the application

9. Click the Measurement Params tab.

For the purpose of this application
example, with its recalled signal, you can
leave the Average field as Off.

If you were using a live signal and wanted
to use averaging, you want to select
Frequency Domain in the Average
field. That is a common s etting.

Leave Correct for Noise Floor
unchecked.

10. Set Filter P arameter to 0.35.

11. Set Chip Rate to 1MHz.

Chip rate is signal bandwidth.

6 SPECMON3 & SPECMON6 Application Examples Reference

12. Select Setup > Analysis to display the

Analysis control panel.

13. Set Time Zero Referenc e to Acquisition

Start.

14. Set the Analysis Offset to 0.

15. Click the settings icon to close the control

panel.

16. Click the Channels Tab. Use this to

define the channels to measure.

17. Change the Number of adjacent pairs

to 1. This will set the instrument to
measure the main channel and the one
adjacent channel on each side of it.

Application 2: M

easuring Channel Strength and Adjacent Channel Power

18. Set Channel B andwidth to 1MHz.

19. Set Channel Spacing to 2MHz.

20. Select File > Recall

Do this to load the saved acquisition file.

21. Go to: C:/SPECMON

Files/SampleDataRecords.

Select Acq data with setup (TIQ) as the
type of file to look for.

Select ACPRDemo.tiq as the file to
recall.

Click Open.

SPECMON3 & SPECMON6 Application Examples Reference 7

Application 2: M

22. Select Data only and click OK.

Do not select Data and setup because
that would loa
saved along with the recalled file. That
would overwrite the settings you made
in the previo
example.

23. View the results.

The absolut
appears in the middle of the graph. The
upper adjacent power ratio appears to
the right,
ratio appears to the left.

The gray-shaded bands illustrate the
space bet
makes ACPR power measurements
within the defined channels, represented
by the uns

The yellow bar at the r ight side of the
display represents the signal strength or field
strengt
strength.

easuring Channel Strength and Adjacent Channel Power

d control values that were

us steps of this application

e channel power value

and the lower adjacent power

ween channels. The analyzer

haded black areas.

h. It rises and falls with the signal

8 SPECMON3 & SPECMON6 Application Examples Reference

Application 3: P

erforming Modulation Analysis

Application 3

The following example shows how to use your analyzer, with Option 21 installed, to demodulate a QPSK signal and to
analyze the signal in multiple domains. You will use the instrument to do the following:

Demodulate a QPSK signal to show its constellation diagram.

Measure the EVM (Error Vector Magnitude) and other key indicators using the Signal Quality display.

View the phase of the signal changing over time.

Use markers to see how the results correlate between the Symbol Table display, Constellation display, and the Phase vs
Time display.

NOTE. The following examples are based on the QPSK sample data file. If desired, you can load the QPSK sample data file

(QPSKDemo.tiq) to recreate the steps used in this application. The signal settings in the following examples are based on
the signal in the sample file. If you use a live signal, your settings may differ.

: Performing Modulation Analysis

SPECMON3 & SPECMON6 Application Examples Reference 9