Tektronix TDSJIT2 Primary User

User Manual

TDSJIT2 Jitter Analysis Measurements Application

071-0814-02

This document supports software version 1.0.0 and above.

www.tektronix.com

Copyright © Tektronix, Inc. All rights reserved. Licensed software products are owned by Tektronix or its suppliers and are protected by United States copyright laws and international treaty provisions.

Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subparagraph (c)(1)(ii) of the Rights in Technical Data and Computer Software clause at DFARS 252.227-7013, or subparagraphs (c)(1) and (2) of the Commercial Computer Software -- Restricted Rights clause at FAR 52.227-19, as applicable.

Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes that in all previously published material. Specifications and price change privileges reserved.

Tektronix, Inc., P.O. Box 500, Beaverton, OR 97077

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

WARRANTY

Tektronix warrants that the media on which this software product is furnished and the encoding of the programs on the media will be free from defects in materials and workmanship for a period of three (3) months from the date of shipment. If a medium or encoding proves defective during the warranty period, Tektronix will provide a replacement in exchange for the defective medium. Except as to the media on which this software product is furnished, this software product is provided “as is” without warranty of any kind, either express or implied. Tektronix does not warrant that the functions contained in this software product will meet Customer’s requirements or that the operation of the programs will be uninterrupted or error-free.

In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the warranty period. If Tektronix is unable to provide a replacement that is free from defects in materials and workmanship within a reasonable time thereafter, Customer may terminate the license for this software product and return this software product and any associated materials for credit or refund.

THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’ RESPONSIBILITY TO REPLACE DEFECTIVE MEDIA OR REFUND CUSTOMER’S PAYMENT IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.

Getting Started

Operating Basics

General Safety Summary ix.........................................

Preface xi........................................................

Related Documentation and Online Help xi..............................

Conventions xii....................................................

Contacting Tektronix xii..............................................

Product Description 1--1........................................

Compatibility 1--1...................................................

Requirements and Restrictions 1--2......................................

Updates Through the Web Site 1--2......................................

Accessories 1--2.....................................................

Installation 1--3...............................................

Applying a New Label 1--3............................................

Installing the Application 1--4..........................................

From the Compact Disc 1--5........................................

From Floppy Disks 1--5...........................................

Enabling the Application 1--6..........................................

Deskewing the Probes and Channels 1--6.................................

Connecting to a System Under Test 1--9..................................

Basic Operations 2--1..........................................

Application Interface 2--1.............................................

Using Basic Oscilloscope Functions 2--2..................................

Using Online Help 2--2............................................

Minimizing and Maximizing the Application 2--2.......................

Returning to the Application 2--3....................................

Application Directories and File Names 2--3...........................

Setting Up the Application 2--4.........................................

Selecting a Measurement 2--4.......................................

Configuring a Measurement 2--6....................................

Specifying Inputs 2--9.............................................

Specifying Qualifiers 2--12..........................................

Specifying Gating/Other 2--13.......................................

Taking Measurements 2--14.............................................

Taking New Measurements 2--14.....................................

Localizing Measurements 2--15......................................

Warning Messages 2--16...............................................

Analyzing the Results 2--16.............................................

Viewing Statistics 2--18.............................................

Viewing Plots 2--18................................................

Clearing Results 2--23..............................................

Saving the Results to a File 2--23.........................................

Logging Statistics 2--23............................................

Data Log File Format 2--24..........................................

Logging Min/Max Waveforms 2--24...................................

TDSJIT2 Jitter Analysis Application User Manual

Table of Contents

Viewing a Data Log File 2--27...........................................

Saving and Recalling Setups 2--27........................................

Saving a Setup 2--28...............................................

Recalling a Saved Setup 2--29........................................

Recalling the Default Setup 2--30.....................................

Exiting the Application 2--30............................................

Tutorial 2--31..................................................

Setting Up the Oscilloscope 2--31........................................

Starting the Application 2--31...........................................

Recalling a Waveform File 2--32.........................................

Taking a Clock Period Measurement 2--33.................................

Taking a Clock-to-Output Time Measurement 2--38..........................

Saving the Results to a Data Log File 2--40.................................

Viewing a Data Log File 2--40...........................................

Stopping the Tutorial 2--42.............................................

Returning to the Tutorial 2--42...........................................

GPIB Program Example 2--43....................................

Guidelines 2--43......................................................

Program Example 2--43................................................

Reference

Appendices

Menu Structure 3--1...........................................

Parameters 3--3...............................................

Measurements Menus 3--3.............................................

Select Active Menu 3--3...........................................

Configure Menu 3--3..............................................

Save/Recall Menu 3--4............................................

Inputs Menus 3--4....................................................

Main and 2nd Menus 3--4..........................................

Qualify Menu 3--5................................................

Gating/Other Menu 3--6...........................................

View Menus 3--6....................................................

Plot Menus 3--6.....................................................

Select Plot Menu 3--6.............................................

Vert/Horiz Axis Plot Menu 3--6.....................................

Log Menus 3--8.....................................................

Statistics Menu 3--8...............................................

Min/Max Wfm Menu 3--9..........................................

Help Menu 3--9.....................................................

Sequence Control Menu 3--9...........................................

Appendix A: Measurement Algorithms A--1........................

Oscilloscope Setup Guidelines A--1......................................

Test Methodology A--1................................................

Edge-Timing Measurements A--2........................................

Single Waveform Measurements A--2....................................

Rise Time Measurement A--2.......................................

Fall Time Measurement A--2........................................

Positive and Negative Width Measurements A--3.......................

TDSJIT2 Jitter Analysis Application User Manual

Table of Contents

High Time Measurement A--3.......................................

Low Time Measurement A--3.......................................

Clock Frequency Measurement A--4..................................

Clock Period Measurement A--4.....................................

Cycle-to-Cycle Measurement A--4...................................

N-Cycle Measurement A--5.........................................

Positive and Negative Cycle-to-Cycle Duty Measurements A--5............

Positive and Negative Duty Cycle Measurements A--5....................

Clock TIE Measurement A--6.......................................

Data Frequency Measurement A--6...................................

Data Period Measurement A--6......................................

Data TIE Measurement A--7........................................

Dual Waveform Measurements A--7......................................

Setup Time Measurement A--7......................................

Hold Time Measurement A--7.......................................

Clock-to-Output Time Measurement A--8..............................

Skew Measurement A--8...........................................

Calculating Statistics A--9..............................................

Maximum Value A--9..............................................

Minimum Value A--9..............................................

Mean Value A--9.................................................

Standard Deviation Value A--9......................................

Cycle-Cycle Value A--10............................................

Max Positive Difference Value A--10..................................

Max Negative Difference Value A--10..................................

Mean Difference (Cycle-Cycle Mean) Value A--10........................

RMS Difference Value A--10.........................................

Population Value A--10.............................................

Appendix B: GPIB Command Syntax B--1.........................

Starting and Setting Up the Application B--2...............................

VARIABLE:VALUE TDS COMMAND B--2..............................

Index

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Table of Contents

List of Figures

Figure 1--1: TDSJIT2 Jitter Analysis Application 1--1...............

Figure 1--2: TDS7000 series oscilloscope label location 1--4...........

Figure 1--3: TDS5000 series oscilloscope label location 1--4...........

Figure 1--4: Typical signal path skew 1--7..........................

Figure 1--5: Enter inputs menu 1--8...............................

Figure 1--6: Deskew complete 1--8................................

Figure 2--1: Application interface 2--1.............................

Figure 2--2: Returning to the application 2--3......................

Figure 2--3: Select Active Measurements menu 2--4.................

Figure 2--4: General measurements configuration 2--6...............

Figure 2--5: Common Cycle Start Edge option configuration 2--7......

Figure 2--6: N-Cycle configuration options 2--7.....................

Figure 2--7: Clk-Data area configuration options 2--8................

Figure 2--8: Skew configuration options 2--8.......................

Figure 2--9: Inputs: Main menu 2--9..............................

Figure 2--10: How to determine voltage reference levels 2--10..........

Figure 2--11: How to enter Autoset Ref Level values 2--11.............

Figure 2--12: Inputs: 2nd menu 2--12..............................

Figure 2--13: Inputs: Qualify menu 2--12...........................

Figure 2--14: Inputs: Gating/Other menu 2--13......................

Figure 2--15: Sequence Control menu 2--14.........................

Figure 2--16: View Warnings menu 2--16...........................

Figure 2--17: Results as statistics and in four display formats 2--17.....

Figure 2--18: Example of viewing data in a .csv file 2--17..............

Figure 2--19: View Results menu, example of three measurements 2--18.

Figure 2--20: Select Plot menu 2--18...............................

Figure 2--21: Vert/Horiz Axis Plot menu: Histogram plot 2--20.........

Figure 2--22: Vert/Horiz Axis Plot menu: Time Trend plot 2--21........

Figure 2--23: Vert/Horiz Axis Plot menu: Cycle Trend plot 2--21........

Figure 2--24: Vert/Horiz Axis Plot menu: Spectrum plot 2--22..........

Figure 2--25: Log: Statistics menu 2--23............................

Figure 2--26: Log file directory 2--24...............................

Figure 2--27: Log: Min/Max Wfm menu 2--25.......................

Figure 2--28: Save/Recall Measurements menu 2--27.................

TDSJIT2 Jitter Analysis Application User Manual

Table of Contents

Figure 2--29: Save directory 2--28.................................

Figure 2--30: Recall directory 2--29................................

Figure 2--31: Exit menu 2--30.....................................

Figure 2--32: Starting the application 2--32.........................

Figure 2--33: Oscilloscope reference memory setup 2--32..............

Figure 2--34: Waveform directory and files 2--33.....................

Figure 2--35: Autoset Ref Level menu 2--34.........................

Figure 2--36: Inputs: Main menu setup 2--34........................

Figure 2--37: Taking a measurement 2--34..........................

Figure 2--38: Clock Period lesson: statistical results 2--35.............

Figure 2--39: Clock Period lesson: Histogram plot 2--35...............

Figure 2--40: Plot after using Horizontal Autoset in the Vert/Horiz

Axis menu 2--36.............................................

Figure 2--41: Clock Period lesson: Time Trend plot 2--37..............

Figure 2--42: Clock Period lesson: Cycle Trend plot 2--37.............

Figure 2--43: Clock Period lesson: Spectrum plot 2--38...............

Figure 2--44: Inputs: 2nd menu setup 2--39.........................

Figure 2--45: Resetting the results 2--39............................

Figure 2--46: Clock-to-Output lesson: statistical results 2--39..........

Figure 2--47: Log Statistics menu with default file name 2--40..........

Figure 2--48: Log file with default file name 2--41....................

Figure 2--49: results.csv file viewed in Wordpad 2--41................

Figure 3--1: Menu structure 3--1.................................

Figure 3--2: Menu structure (continued) 3--2.......................

TDSJIT2 Jitter Analysis Application User Manual

Table of Contents

List of Tables

Table 1--1: Compatible oscilloscopes 1--1..........................

Table 1--2: Default waveform assignments 1--9.....................

Table 2--1: Application interface items 2--2........................

Table 2--2: Default directory names 2--3..........................

Table 2--3: File name extensions 2--3.............................

Table 2--4: Select Active Measurements areas and options 2--5........

Table 2--5: N-Cycle configuration options 2--7.....................

Table 2--6: Clk-Data measurements configuration options 2--8.......

Table 2--7: Skew configuration options 2--9........................

Table 2--8: Inputs: Main and 2nd options 2--10......................

Table 2--9: Autoset Ref Level menu entry methods 2--11..............

Table 2--10: Inputs: Qualify areas and options 2--13.................

Table 2--11: Inputs: Gating/Other options 2--14.....................

Table 2--12: Sequence Control menu 2--15..........................

Table 2--13: Select Plot areas and options 2--19......................

Table 2--14: Vert/Horiz Axis Plot options for Histogram plots 2--20.....

Table 2--15: Vert/Horiz Axis Plot option for Time Trend plots 2--21.....

Table 2--16: Vert/Horiz Axis Plot options for Cycle Trend plots 2--22....

Table 2--17: Vert/Horiz Axis Plot options for Spectrum plots 2--22......

Table 2--18: Log: Statistics options and buttons 2--23................

Table 2--19: Log Min/Max Wfm options and buttons 2--25...........

Table 2--20: File names for Min/Max waveforms 2--26...............

Table 2--21: Save/Recall Measurements options 2--28................

Table 2--22: Waveforms and signal types 2--32......................

Table 3--1: Configure Measurements menu parameters 3--4..........

Table 3--2: Save/Recall Measurements menu parameters 3--4........

Table 3--3: Inputs: Main and Inputs: 2nd menu parameters 3--5.....

Table 3--4: Autoset Ref Level menu parameters 3--5................

Table 3--5: Inputs: Qualify menu parameters 3--5..................

Table 3--6: Inputs: Gating/Other menu parameters 3--6.............

Table 3--7: Histogram: Vert/Horiz Axis Plot menu parameters 3--7....

Table 3--8: Horizontal Center and Span parameters 3--7.............

Table 3--9: Time Trend: Vert/Horiz Axis Plot menu parameter 3--8....

Table 3--10: Cycle Trend: Vert/Horiz Axis Plot menu parameters 3--8..

TDSJIT2 Jitter Analysis Application User Manual

Table of Contents

Table 3--11: Spectrum: Vert/Horiz Axis Plot menu parameters 3--8....

Table 3--12: Log Statistics menu parameters 3--8...................

Table 3--13: Log Min/Max Wfm menu parameters 3--9..............

Table 3--14: Sequence Control menu parameters 3--9...............

Table B--1: VARIABLE:VALUE TDS COMMAND arguments

and queries B--2...........................................

Table B--2: Measurement results queries B--3......................

Table B--3: Results returned by measurements B--4.................

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TDSJIT2 Jitter Analysis Application User Manual

General Safety Summary

Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it. To avoid potential hazards, use this product only as specified.

Only qualified personnel should perform service procedures.

While using this product, you may need to access other parts of the system. Read the General Safety Summary in other system manuals for warnings and cautions related to operating the system.

ToAvoidFireor

Personal Injury

Symbols and Terms

Connect and Disconnect Properly. Do not connect or disconnect probes or test leads while they are connected to a voltage source.

Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings and markings on the product. Consult the product manual for further ratings information before making connections to the product.

Do Not Operate With Suspected Failures. If you suspect there is damage to this product, have it inspected by qualified service personnel.

Terms in this Manual. These terms may appear in this manual:

WARNING. Warning statements identify conditions or practices that could result in injury or loss of life.

CAUTION. Caution statements identify conditions or practices that could result in damage to this product or other property.

Terms on the Product. These terms may appear on the product:

DANGER indicates an injury hazard immediately accessible as you read the marking.

WARNING indicates an injury hazard not immediately accessible as you read the marking.

CAUTION indicates a hazard to property including the product.

Symbols on the Product. The following symbol may appear on the product:

CAUTION Refer to Manual

TDSJIT2 Jitter Analysis Application User Manual

General Safety Summary

TDSJIT2 Jitter Analysis Application User Manual

Preface

This manual contains operating information for the TDSJIT2 Jitter Analysis Application. The manual consists of the following chapters:

H The Getting Started chapter briefly describes the TDSJIT2 Jitter Analysis

Application, lists oscilloscope compatibility, and provides installation instructions.

H The Operating Basics chapter covers basic operating principles of the

application and includes a tutorial that teaches you how to set up the application to acquire a waveform, take measurements, and view the results.

To show you how to operate the application using GPIB commands, this chapter includes a simple GPIB program.

H The Reference chapter includes a diagram of the menu structure and

descriptions of parameters.

H The Measurement Algorithms appendix contains information on measure-

ment guidelines and on how the application takes the measurements.

H The GPIB Command Syntax appendix contains a list of arguments and values

that you can use with the GPIB commands and their associated parameters.

Conventions

You can find a portable document format (PDF) file of the installation manual in the Documents directory on the Optional Applications Software on Windows-

Based Oscilloscopes Installation CD--ROM.

This manual uses the following conventions:

H This manual refers to the TDSJIT2 Jitter Analysis Application as the

TDSJIT2 application or as the application.

H This manual refers to any product on which this application will run as an

oscilloscope

H When steps require that you make a sequence of selections using the

application interface, the > delimiter marks each transition menus and

options. For example, one of the steps to recall a setup file would appear as

Measurements> Save/Recall> Recall.

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TDSJIT2 Jitter Analysis Application User Manual

Contacting Tektronix

Preface

Phone 1-800-833-9200*

Address Tektronix, Inc.

Department or name (if known) 14200 SW Karl Braun Drive P.O. Box 500 Beaverton, OR 97077 USA

Web site www.tektronix.com

Sales support 1-800-833-9200, select option 1*

Service support 1-800-833-9200, select option 2*

Technical support Email: techsupport@tektronix.com

1-800-833-9200, select option 3* 1-503-627-2400

6:00 a.m. -- 5:00 p.m. Pacific time

* This phone number is toll free in North America. After office hours, please leave a

voice mail message. Outside North America, contact a Tektronix sales office or distributor; see the Tektronix web site for a list of offices.

TDSJIT2 Jitter Analysis Application User Manual

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Preface

xiv

TDSJIT2 Jitter Analysis Application User Manual

Getting Started

Product Description

The TDSJIT2 Jitter Analysis Application is a Java-based application that enhances basic capabilities of some Tektronix oscilloscopes.

The application provides jitter analysis measurements, can display the statistical results of up to six measurements, can display the results as plots, can save the results to a data log file, and can save the worst case waveforms to files.

Figure 1--1 shows an example of statistical results for a Clock Period measurement in the application part of the display (lower half) and a Histogram plot of those results in the oscilloscope part of the display (upper half).

Figure 1--1: TDSJIT2 Jitter Analysis Application

Compatibility

The Jitter Analysis Application is compatible with several TDS7000 series oscilloscopes. Table 1--1 lists the oscilloscopes and firmware version numbers.

Table 1--1: Compatible oscilloscopes

Model number* Firmware version

TDS7054 and TDS7104 1.2.0 and above

TDS7404 1.3.0 and above

TDS7254 1.3.1 and above

TDS5054 and TDS5104 1.0.0 and above

* For a current list, see the Software and Drivers category on www.tektronix.com.

TDSJIT2 Jitter Analysis Application User Manual

1--1

Product Description

Requirements and Restrictions

The SunT Java Run-Time Environment V1.2.2 or above must be installed on the oscilloscope to operate the TDSJIT2 application.

NOTE. This application may be compatible with future models of oscilloscopes that have different specifications. If this occurs, menus or options that are unavailable will appear dim if they are beyond the acquisition capability of the oscilloscope.

Updates Through the Web Site

You can find information about this and other applications at the Tektronix Inc. web site, www.tektronix.com. Check this site for application updates and for other free applications.

To install an application update, you will need to download it from the Tektronix web site to the oscilloscope hard disk.

NOTE. More information about changes to the application or installation is in a

Readme.txt file on the web site. You should read it before you continue.

To download an application from the web site, follow these steps:

1. Access www.tektronix.com/Software & Drivers/Oscilloscopes.

2. Scroll through the files to the application that you want, select the file, and

download it to your hard disk drive. If necessary, unzip the file.

If your oscilloscope is connected to a network, you do not need to follow the

remaining steps.

3. If your oscilloscope is not connected to a network, copy the application from

the hard disk to blank, DOS-formatted floppy disks.

NOTE. To ensure that the files were downloaded successfully, always unzip the files on a hard disk before copying them to floppy disks.

Accessories

1--2

4. To install the application, follow the From Floppy Disks procedure on

page 1--5.

There are no standard accessories for this product other than this manual.

TDSJIT2 Jitter Analysis Application User Manual

Installation

This section contains information on the following tasks:

H Applying a new label

H Installing the TDSJIT2 application

H Enabling the application

H Deskewing the probes and channels

H Connecting to a system under test

NOTE.TheOptional Applications Software on Windows-Based Oscilloscopes Installation Manual contains up-to-date information and procedures. Since

installation procedures may be different for the TDS7000 series and other oscilloscopes, be sure to check this manual before you install the softw are.

You can find a portable document format (PDF) file of the installation manual in the Documents directory on the Optional Applications Software on Windows-

Based Oscilloscopes Installation CD--ROM.

Applying a New Label

If you receive a newer version of this application, or purchase an application that did not exist when you bought your oscilloscope, you need to apply a new label to the rear panel of the oscilloscope. The label contains important information, such as the serial number of the oscilloscope, options purchased for that serial number, and an authorized Option Installation key number. Each label is unique.

Figure 1--2 shows where to apply the new label on the back of a TDS7000 series oscilloscope.

Figure 1--3 shows where to apply the new label on the back of a TDS5000 series oscilloscope.

TDSJIT2 Jitter Analysis Application User Manual

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Installation

Label location

Figure 1- 2: TDS7000 series oscilloscope label location

Label location

Figure 1- 3: TDS5000 series oscilloscope label location

Installing the Application

Normally, the TDSJIT2 application resides on the hard disk drive of your oscilloscope. However, you may still need to install the application software for the following reasons:

H You receive an application introduced after you received your oscilloscope

H Youhavetorebuildtheharddrive

NOTE. To operate the TDSJIT2 application, the Java Run-time Environment (JRE) V1.2.2 or above must be installed on your oscilloscope.

If the JRE is not installed, a message displays when you try to start the application. If the message appears, reinstall the JRE from the optional applications software for Windows-based oscilloscopes compact disc (CD).

1- 4

TDSJIT2 Jitter Analysis Application User Manual

Installation

From the Compact Disc

To install the TDSJIT2 application from the optional applications software for Windows-based oscilloscopes CD, follow these steps:

1. If the keyboard is not installed, connect it to the oscilloscope rear panel (the

optional-accessory keyboard plugs into the USB connector).

2. Power on the oscilloscope to start Windows.

3. Install the optional applications software CD in the C D-ROM reader on the

rear-panel of the oscilloscope.

4. Select the My Computer icon.

5. In the Exploring -- My Computer window, select the D: (CD-ROM) drive.

6. The Java Run-time Environment software must be installed before you can

install optional application software. If the Java Run-time Environment software is already installed, skip to step 7; otherwise, follow these steps:

a. Select the Jre directory.

b. Select the .exe file in the Jre directory.

c. Accept all default settings recommended by the install program.

7. Select the Tdsjit2 directory.

From Floppy Disks

8. Select the Setup.exe file to start the install program.

9. Follow the instructions given by the install program. The oscilloscope must

reboot to complete the installation process.

To install the TDSJIT2 application from floppy disk, follow these steps:

1. Power on the oscilloscope to start Windows.

2. Insert disk #1 in the floppy disk drive.

3. Select the My Computer icon.

4. In the Exploring -- My Computer window, select the A: (3 1/2 Floppy) drive.

NOTE. Additional information about the application or installation is located in a Readme.txt file on the floppy disk. Read the file before you continue.

If you are updating the application, the Readme.txt file on the Tektronix web site supercedes the Readme.txt file on the floppy disk.

5. Select the Setup.exe file to start the install program.

6. Follow the on-screen instructions.

TDSJIT2 Jitter Analysis Application User Manual

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Installation

7. When the installation is complete, the oscilloscope will restart. You need to

Enabling the Application

You will need to enter the authorized Option Installation Key to enable the application. The key is specific to the serialized oscilloscope and options for which it was purchased.

NOTE. Do not enter this key until all application software that you have purchased has been installed.

To enter the key number, follow these steps:

Wait until after the floppy disk drive LED has gone out to remove each

floppy disk and insert another.

remove the final floppy disk when prompted.

1. If the oscilloscope powered on in the toolbar mode (default), select the Menu

button (upper right corner of the display) to put the oscilloscope into

menu-bar mode. In menu-bar mode you should see a PC-style menu across

the top of the display.

2. Go to the Utility menu in the menu bar and select Option Installation.

3. Follow the on-screen instructions to enter the alphanumeric key number

exactly as it is printed on the rear-panel label. Figure 1--2 on page 1--4

shows the location of the label on the back of the oscilloscope.

Deskewing the Probes and Channels

To ensure accurate results for two-channel measurements, it is important to first deskew the probes and oscilloscope channels before you take measurements from your system under test (SUT). Deskewing is where the oscilloscope adjusts the relative delay between signals to accurately time correlate the displayed waveforms.

NOTE. To produce good deskew results, you should connect the probes to the fastest signal in your SUT.

1- 6

The application includes an automated deskew utility that you can use to deskew any pair of oscilloscope channels. The following procedure describes how to deskew two channels. Channel 1 (and the probe connected to it) is the reference point used to deskew channel 2. The steps to deskew the third and fourth channels are the same.

TDSJIT2 Jitter Analysis Application User Manual

Installation

To deskew a pair of probes and oscilloscope channels, follow these steps:

1. Follow the procedure on page 1--9 to connect similar probes to CH1 and

CH2 on the oscilloscope.

2. Connect the probes to the fastest signal in your SUT.

3. Set up the oscilloscope as follows:

a. Use the Horizontal Scale knob to set the oscilloscope to an acquisition

rate so that there are two or more samples on the deskew edge.

b. Use the Vertical Scale and Position knobs to adjust the signals to fill the

display (view the full amplitude) without missing any part of the signals.

c. Set the Record Length so that there are more than 100 edges in the

acquisition.

Figure 1--4 shows an example of signal path skew found in similar probes.

Figure 1- 4: Typical signal path skew

4. Start the application as described on page 2--33.

5. Select Inputs> Main > and set the Source to Ch 1. The Source waveform is

the reference point to which the remaining channels are deskewed.

TDSJIT2 Jitter Analysis Application User Manual

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Installation

6. Select Inputs> 2nd> and set the Source to Ch 2, the channel to be deskewed.

7. To start the deskew utility, select Deskew and confirm the operation.

8. Select appropriate values in the Enter inputs menu, and then select OK.

Figure 1--5 shows the Enter inputs menu.

Figure 1- 5: Enter inputs menu

The utility displays information as it deskews the channels, such as the

number of samples processed and specified. Figure 1--6 shows an example of

the utility when it is finished. In this example, the skew between channels 1

and 2 was reduced to about 57 ps.

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Figure 1- 6: Deskew complete

TDSJIT2 Jitter Analysis Application User Manual

9. Do not change the Input: Main channel, and deskew the remaining channels.

Connecting to a System Under Test

You can use any compatible probes to connect between your SUT (system under test) and oscilloscope. One connection is usually to a clock signal.

The Clock-to-Data measurements and the Skew measurement require two input channels or two reference waveforms.

Table 1--2 shows the default channel-to-waveform and reference waveform-to plot assignments. You can change the assignments to match your configuration.

Table 1- 2: Default waveform assignments

Channel or reference Waveform assignment

Ch 1 Main input waveform, such as a clock signal

Ch 2 Second (2nd) input waveform

Ref1 Histogram plot format for the first measurement

Ref2 Time Trend plot format for the first measurement

Ref3 Cycle Trend plot format for the first measurement

Ref4 Spectrum plot format for the first measurement

Installation

WARNING. To avoid electric shock, you must ensure that power is removed from the SUT before attaching probes to it. Do not touch exposed conductors except with the properly rated probe tips. Refer to the probe manual for proper use.

Power down the SUT before connecting the probes to it.

TDSJIT2 Jitter Analysis Application User Manual

1- 9

Installation

1- 10

TDSJIT2 Jitter Analysis Application User Manual

+ 88 hidden pages

Tektronix TDSJIT2 Primary User

Specifications and Main Features

Frequently Asked Questions

User Manual

WARRANTY

Table of Contents

List of Figures

List of Tables

General Safety Summary

Preface

Related Documentation and Online Help

Conventions

Contacting Tektronix

Product Description

Compatibility

Requirements and Restrictions

Updates Through the Web Site

Accessories

Installation

Applying a New Label

Installing the Application

Enabling the Application

Deskewing the Probes and Channels

Connecting to a System Under Test