Tektronix RSA306 Manuale utente

Tektronix RSA306 USB Spectrum

Analyzer

‐Simple Demos

The Demo of the RSA306 is easy. Even you do not have signal generators, devices under test, or demo

boards, using the whip antenna provided in box, you can demodulate and listen to the signals from the

local FM broadcasting station, or see the real-time spectrum of the signals in the ISM band created by

your smart phone, and show how the RSA306 can be used in interference-hunting. The pre-compliance

measurements of electromagnetic interference (EMI) are also easy to demo. This demo guide shows

how to use the RSA306 in off-air applications.

Setup Page 1

Installing SignalVu-PC Page 2

Activating SignalVu-PC Page 2

Setting up Live link Page 2

Over-the-air Demo:

Demo 1 FM listening Page 3

Demo 2 ISM band DPX Page 4

Demo 3 EMI spurious Page 6

The .tiq setup files are provided for each Demo. You can recall them if you have any problems with your

setup

RSA306 USB Real-Time Spectrum Analyzer Demo Guide

Setup

PowertheRSA306byconnectingtheUSB3.0cabletotheUSB3.0portofyourPC.

InstalltheN‐BNCadaptoronRSA306.

Setup the RSA306

InstalltheSignalVu‐PCsoftwareprovidedontheUSBdrive,oryoucandownload

fromTek.com.

UsetheLiveLinkinSignalVu‐PCtobuildupthecommunicationbetweenthePCand

theconnectedRSA306.

Install and setup SignalVu-PC

Connectthewhipantennaprovidedinthebox totheRFportoftheRSA306.

Connect the antenna

USB3.0 cable

Antenna

WindowsbasedPCTektronixRSA306

As with any test, one of the first steps is to connect the instrument to the

device under test. For the initial exploration, a whip antenna has been

provided to receive signals needed for the Demo. After you’ve completed

the Demo and have gained an understanding of how the RSA306

operates, please feel free to connect to your own system and see how the

RSA306 can help in your day-to-day work.

RSA306 USB Real-Time Spectrum Analyzer Demo Guide

Installing SignalVu-PC

SignalVu-PC can be downloaded from the Tektronix.com or included in the USB drive in the box.

1. Use Windows Explorer to navigate to the folder you extracted from the archive.

2. Double-click Setup.exe. Follow the on-screen instructions to install the software.

3. When installation is almost complete, a dialog box will appear to let you choose if you want to

install TekVISA. TekVISA is optimized for SignalVu-PC, especially for instrument searching, and

is the recommended VISA application. You may also use another VISA application, such as

NIVISA. To bypass TekVISA installation, uncheck the box.

TekVISA is NOT necessary to run SignalVu-PC with RSA306.

Activating SignalVu-PC

The SignalVu-PC SVE is free to use, so no activation is needed. To activate the other options in

SignalVu-PC,

1. Launch SignalVu-PC. A window will be displayed stating that no license was found.

2. In the dialog, select I have a key – activate now.

3. In the Enter Activation Key text box, enter the activation key for SignalVu-PC.

4. Click OK in the License Activation window. SignalVu-PC will contact the license server and install

a license file provided by the license server.

Setting up Live link

1. Double click the SignalVu-PC icon on

the Desktop of PC to start the

application.

2. Click Live Link on the menu bar to view

the drop down menu. Click Search for

Instrument.

A notification will briefly appear stating

that the instrument was found.

3. Click Connect To Instrument. Select

RSA306@USB USB::0. Note: initial

connection of the instrument can take up

to 20 seconds on a new installation.

4. A Connect Status dialog box will appear

to confirm the instrument is connected.

Click OK.

Quick Tips: Live Link

You can quickly verify connection status by looking at the connection indicator square on the menu

bar. It is green ( ) when an instrument is connected. It is red ( ) when it is not. You can also view the

name of the instrument that is connected by hovering the mouse indicator over the .

RSA306 USB Real-Time Spectrum Analyzer Demo Guide

Demo 1: FM listening

The RSA306 Series USB Spectrum Analyzers can demodulate audio signals, which can help you to

identify unknown radio signals. You access the Audio Demod tab from the Settings control panel of the

DPX Spectrum plot display. This Demo shows how to use RSA306 to demodulate the local FM radio

signals and listen to your programming.

1. In the Presets button.

2. In the DPX display, set the CF to 97.75 MHz and

the Span to 20.5 MHz.

3. Set the RefLev to -30 dBm.

4. Right click the screen, and click Marker to peak.

5. Click To Center in the bottom marker setting area.

This sets the center frequency of the analyzer to

the center of the signal.

6. Click the Audio settings.

7. Select FM – 200 kHz as the demodulation.

8. Click Run to start listen to the FM radio.

9. Adjust the Audio Gain setting so you can hear the

demodulated signal. Note that the sound level is

also affected by the Windows volume control.

10. Click the Browse… button to select the location

you want to save the steam file.

11. Enable the Activate button to start save the

steaming audio, and disable the activate button

when you want to stop saving. The saved .wav file

can be played by windows media player.

Please also try to drag the marker to other peaks, and

listen to the programming at other channels.

RSA306 USB Real-Time Spectrum Analyzer Demo Guide

Demo 2: ISM band DPX

The real time engine of the RSA306 series is designed to address the measurement challenges

associated with dynamic RF signals such as the bursted packet transmissions of WLAN and Bluetooth.

Combo devices that use both Bluetooth and 802.11b/g/n WLAN networks have a unique set of RF

interference problems because they share the same 2.4 GHz Industrial/Scientific/Medical (ISM) frequency

band. In this example, we will explore this real-world problem using a whip antenna.

1. In the Presets button.

2. Click the Display button.

3. Under the General Signal Viewing, select

DPX from the Available displays box.

4. Click the Add button. This will add the DPX

icon to the Selected Displays box (and

remove it from the Available displays box).

5. Click the OK button.

6. In the DPX display, set the CF to 2462 MHz or

to the center frequency of one of the WLAN

channels. See the quick tip below. Set the

Span to 40 MHz.

7. Select the Split view.

8. Set the RefLev to -40 dBm.

9. In the DPX display, and click the settings

button.

10. Under the Bitmap Scale tab, set the Max

scale to 3% for the DPX Spectrum Display.

11. Under the Ampl Scale tab, set the Max color

scale to -40 dBm for the DPXogram Display.

Quick Tip: 2.4GHz WLAN Channels

There are 14 channels designated in the 2.4

GHz range (2400–2483.5 MHz) spaced 5

MHz apart. Channels 1(2412 MHz), 6 (2437

MHz), and 11 (2462 MHz) are the most

common channels to choose, and most

routers will use one of them as the default

channel.

RSA306 USB Real-Time Spectrum Analyzer Demo Guide

12. Turn the WLAN function Off, then On in your smart

phone/tablet/PC while monitoring the DPX display.

Check the DPX display to see if you can see the

spectrum of the WLAN signals. If no signal, you can

change the center frequency of the RSA306 to other.

13. Turn the Bluetooth function Off, then

On in your smart phone/tablet/PC while monitoring the

DPX display.

14. Click Stop to stop the acquisitions when you have a

pattern on the spectrogram you would like to examine.

15. Right click the display, and click Add markers twice to

add two markers. Then you can measure the distance

between hops in frequency and time using the markers

on the spectrogram.

You can see a typical WLAN interchange between a nearby

smart phone/tablet/PC and a more-distant network access point

(AP). The smart phone/tablet/PC signal is nearly 30 dB stronger

than the AP's signal because it is closer to measurement

antenna. At the same screen, you can also see the Bluetooth

signals, and even the measurements of the time and frequency

intervals between those hop signals.

DownlinkWLAN

UplinkWLAN

Bluetooth

DownlinkWLAN

UplinkWLAN

Bluetooth

Distancebetweenhopsinfrequencyandtime

Quick Tip: Wi-Fi Test mode

To have a better observation of the WLAN

activities in the DPX display. You can

cause both uplink and downlink activity on

your device by navigating to an “internet

speed testing” webpage to test both the

uploading and downloading speed, and

monitor the DPX display of the RSA306 at

the same time.

On your

smart

phone,

tablet, or

RSA306 USB Real-Time Spectrum Analyzer Demo Guide

Demo 3: EMI spurious

The spurious measurement in the RSA306 is set up to

change limits vs. frequency, and antenna correction factors

have been applied, resulting in the sloped noise floor of the

displayed signal. Violations above the user-set limits are

shown in red on the table. This example shows how to use

the spurious display in RSA306 to perform EMI pre-

compliance and diagnostics.

1. Click Presets.

2. Click the Display button.

3. Under the RF Measurement, select Spurious

from the Available displays box.

4. Click Add to add the application to the Selected

Displays list.

5. Select the Spectrum icon in the Selected Displays

list.

6. Click Remove to clear the icon from the list.

7. Click OK.

8. Click the settings button.

9. In the Scale tab, select the Log scale to reset the

display to show the frequency axis in a logarithmic

scale.

10. Under the Ranges and Limits tab, click Load to

select the appropriate limit line and measurement

condition.

11. Please select FCC Part 15, Rad, Class A

(10m).csv from the C:/SignalVu-PC

Files/Examples directory for this exercise.

12. A larger new resized window of range and limit

table can be displayed by clicking Expand.

Quick Tips: Loss correction

The External Gain/Loss Correction tab under the

amplitude control panel ( ) allows you to apply a

correction to a signal to compensate for the use of

external equipment, such as an amplifier or attenuator.

External Loss Table can be used to apply a frequency

dependent gain/loss correction to the signal.

RSA306 USB Real-Time Spectrum Analyzer Demo Guide



10/2014 © Tektronix 37W-30933--0

You can edit the start and stop range, filter shape, RBW, VBW, detector, threshold and excursion, limit

line.

After loading the spurious table, your display should look similar to the picture below. The green bar is the

loaded limit line as standards.

Thespursare indicatedwhenthey

areinviolationofthelimit.

Spurtabledisplaysthedetailinformationof

thedetectedspurs

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