Tektronix TDSDVD User manual

TDSDVD Optical Storage Analysis Application

2 TDSDVD Optical Storage Analysis Application

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 documentation supercedes that in all previously published material. Specifications and price change privileges reserved.

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

TEKTRONIX, TEK, and TEKPROBE are registered trademarks of Tektronix, Inc.

TDSDVD Optical Storage Analysis Online Help, OLH0200, Version 01.00

TDSDVD Optical Storage Analysis Application

General Safety

WARNING: To avoid injury to eyes, wear eye protection if the

possibility of exposure to high-intensity rays or laser radiation exists.

WARNING: To avoid electric shock, remove power from the system under test (SUT) before attaching a probe to it. Do not touch exposed conductors except with the properly rated probe tips. Refer to the probe manual for proper use.

4 TDSDVD Optical Storage Analysis Application

Table of Contents

Welcome tothe TDSDVD Optical Storage Analysis Application ............... 7

Using Online Help......................................................................................7

Related Documentation.............................................................................. 8

Accessing Online Documents....................................................................9

Contacting Tektronix..................................................................................9

Product Feedback......................................................................................9

Color Printing ........................................................................................... 10

Getting Started 11

Product Description..................................................................................11

Accessories.............................................................................................. 11

Compatibility.............................................................................................12

Requirements and Restrictions................................................................12

Installation................................................................................................13

Connecting to a System Under Test........................................................16

Operating Basics 19

Running the Application........................................................................... 19

The Application Interface.........................................................................20

Command Buttons ................................................................................... 22

Application Menu Bar...............................................................................24

Minimizing and Maximizing the Application.............................................. 24

Accessing Oscillo scope Functions...........................................................24

Exiting the Application.............................................................................. 25

Application Directories ............................................................................. 25

File Name Extensions.............................................................................. 25

Taking Measurements 27

About Taking Measurements................................................................... 27

Taking Measurements Guidelines............................................................27

Acquiring the Data Signal......................................................................... 30

Displaying an Eye Waveform................................................................... 30

Selecting a Standard................................................................................ 31

Setting Up the Input Options....................................................................32

Selecting and Configuring Measurements...............................................39

Taking Measurements.............................................................................. 40

Viewing Results........................................................................................ 40

Saving and Recalling Setups...................................................................42

Saving Results to a File...........................................................................43

Using Custom Plug-In Processes ............................................................ 46

Tutorial 49

Introduction to the Tutorial ....................................................................... 49

Setting up the Oscilloscope...................................................................... 49

TDSDVD Optical Storage Analysis Application

Recalling a Waveform..............................................................................49

Starting the Application............................................................................ 50

Setting Up the Signal Source...................................................................50

Selecting the Measurement.....................................................................51

Configuring the Measurement.................................................................. 51

Taking the Measurement.........................................................................52

Viewing the Results..................................................................................53

Displaying a Measurement Histogram.....................................................54

Displaying a Time Interval Analysis (TIA) plot.......................................... 55

Saving the Measurement Data................................................................. 55

Stopping the Tutorial................................................................................55

Returning to the Tutorial........................................................................... 56

Reference 57

Menus......................................................................................................57

Parameters...............................................................................................87

Algorithms................................................................................................ 91

GPIB Programming................................................................................ 101

6 TDSDVD Optical Storage Analysis Application

Introduction

Welcome to the TDSDVD Optical Storage Analysis Application

The TDSDVD Optical Storage Analysis & Measurement Application is a Java– based application that lets you quickly and easily measure and analyze CD/DVD/MO optical storage device signals.

What do you want to do?

Read the Product Description on page 11 Learn About Online Help on page 7 Go to Installation on page 13

Using Online Help

Select Help on the right side of the application's Menu bar to open the Help window. The main (opening) Help window has three tabs:

• Table of Contents (TOC) tab: Displays the help information organized into book-like sections. Click a book icon to open a section; select any of the topics listed under the book.

• Index tab: Displays a list of alphabetical keywords. Click the topic of interest to bring up the appropriate help page.

• Find tab: Displays a box in which you can enter a word or words for which to search. a text-based search.

To print a topic, select the Print button from the help topics menu bar. If you are printing to a monochrome printer, see Color Printing on page 10.

Select the Back button to return to the previous help window. Sometimes you can jump from one topic to another through a hyperlink. If the Back button is "grayed out" or a jump is not available, choose the "Help Topics" button to select the originating help topic.

Browse buttons (Next >> and Previous <<) allow you to move forward and backward through topics in the order of the Table of Contents.

A Green text (with dotted underline) indicates a Popup window. Click the green text to display a brief help message. Click to return to the topic.

Green-underlined text indicates a Jump (link) to another topic. Select the green text to jump to the related topic.

TDSDVD Optical Storage Analysis Application

Introduction

To return to the Online Help Table of Contents, select Help Topics from the Help Top Menu.

See Also

Using Online Help on page 7

8 TDSDVD Optical Storage Analysis Application

Introduction

Accessing Online Documents

To view a PDF file of the TDSDVD online help from a PC with the application installed, select Start > Programs > TekApplications > TDSDVD, and select the PDF file from the list. The corresponding PDF file displays.

To run the TDSDVD online help without starting the application, select Start > Programs > TekApplications > Help. The TDSDVD help program displays.

Contacting Tektronix

Phone 1-800-833-9200*

Address Tektronix, Inc.

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

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

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

* This Telephone 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.

Product Feedback

Tektronix values your feedback on our products. To help us serve you better, please send us any suggestions, ideas, or other comments you may have regarding your oscilloscope or application.

Send your feedback to us by email to techsupport@tektronix.com or FAX us at (503) 627-5695. Please provide as much of the following information as possible:

• Your name, company, mailing address, phone number, and FAX number

• Oscilloscope model number and hardware options, if any

• Probes used

• Software version number

• Description of the problem such that technical support can duplicate the

problem

TDSDVD Optical Storage Analysis Application

Introduction

• If possible, save the oscilloscope and application setup and information .set and .ini files

• If possible, save the waveform on which you are performing the measurement as a .wfm file

Once you have gathered this information, you can contact technical support by phone or through e-mail. If using e-mail, be sure to enter in the subject line "TDSDVD Problem," and attach the .set, .ini, and .wfm files. Please indicate if you would like to be contacted by Tektronix regarding your suggestion or comments.

To create oscilloscope screen shots to include with your email or FAX, follow these steps:

1. In the oscilloscope menu bar, select File > Export to display the Export dialog box.

2. Enter a file name. The default file type is bitmap (.bmp).

3. Select Save. The file is saved in the C:\TekScope\Images directory. You can then attach the file to your email (depending on the capabilities of your email editor).

Color Printing

Many of the online help topics include color examples of application screens. Printing these color topics on a monochrome printer can result in loss of image information due to how different monochrome printers interpret and print color information.

If you do not have access to a color printer, you should print the topic from the application Online Help PDF (portable document format) file. You can find the file in the Documents directory on the Optional Applications Software on a Windows-Based Oscilloscope CD.

10 TDSDVD Optical Storage Analysis Application

Getting Started

Product Description

The TDSDVD Optical Storage Analysis and Measurement Application is a Javabased application for measuring and analyzing the amplitude, modulation, and timing characteristics of CD/DVD/MO optical storage device encoded signals. The application features include:

• Supports, but is not restricted to, common CD/DVD/MO optical storage standards

• Displays measurement results as numeric values, linear plots, or histogram plots

• Supports adding external MATLAB (version 6.1 or later) and .DLL signal analysis/processing software.

Accessories

• Supports Time Interval Analysis (TIA) display

• Displays a count of Track Error pulses

• Ability to install and run TDSDVD on a PC to take advantage of greater

processing power; the PC must be connected to the oscilloscope on which the TDSDVD applicationis installed and enabled

• Saves measurement setups and results to a file

What do you want to do?

Check Compatibility, see page 12 Look Over Requirements and Restrictions, see page 12 Go to Installation, see page 13 Connecting to a System Under Test, see page 16 Start Running the Application, see page 19

There are no standard accessories for this product.

TDSDVD Optical Storage Analysis Application

Getting Started

Compatibility

This table lists the oscilloscopes that support the TDSDVD application.

Application

TDSDVD* Optical Storage Analysis and Measurements V 1.0.0* and above

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

Oscilloscope Model

TDS7054, TDS7104 V 2.1.0 and above TDS7154, TDS7254, TDS7404 CSA7154, CSA7404 V 2.0.0 and above TDS5052, TDS5054, TDS5104

Requirements and Restrictions

To operate the TDSDVD application, the Sun Microsystems Java Run-Time Environment (JRE) version 1.4 (or greater) must be installed on the oscilloscope. The TDSDVD installation program automatically installs the proper version of JRE. If you accidentally delete the JRE on your oscilloscope, you will need to reinstall the TDSDVD application.

This application assumes that the following conditions are met to obtain measurements:

• The data source signal is a continuous physical data disk recording of nT pulses with no gaps or non-nT type data.

Oscilloscope Software Version

V 2.0.0 and above

V 1.0.7 and above

• The clock period (T) of the data source signal is constant.

The following table lists memory requirements for taking six measurements at one time on long record length data samples.

Record Length Windows RAM

Up to 4 M samples 4 M samples and above* * Taking measurements on 4 M (or greater) data records can take significant time to process. Running the application on a PC with a 1 GHz or greater processor can reduce processing time.

Required Recommended

256 MB 256 MB

256 MB 512 MB

12 TDSDVD Optical Storage Analysis Application

Getting Started

Installation

To install the TDSDVD application software on an oscilloscope, refer to the

Optional Applications Software on a Windows-Based Oscilloscope Installation Manual, which is part of the optional applications CD and documentation kit.

The installation manual contains the following information:

• A list of applications, compatible oscilloscopes, and relevant software and firmware version numbers

• How to apply the option label

• Installation procedures

• How to enable an application

• How to install the application on a PC

• How to configure the PC-installed application to communicate with an

oscilloscope using a GPIB or LAN connection

You can find the corresponding Portable Document Format (PDF) file for the installation manual in the Documents directory of the Optional Applications Software on a Windows-Based Oscilloscope CD at C\Program Files\Tek Applications\tdsdvd.

Note.

The CD booklet in the CD case only contains information on installing the application from the CD and on how to apply a new label.

PC Installation

You can install the TDSDVD application on a PC with Windows 98 or Windows 2000 operating systems. Operating the application from a PC allows the application to use the additional processing power of the PC.

Note.

Ensure that the PC has access to the oscilloscope with the enabled application, either over a local area network (LAN) or through a GPIB cable.

To set up a PC to control the application over a LAN or GPIB cable, you need to do the following tasks:

• How to download updates from the Tektronix web site

• Setting Up the Oscilloscope for Remote Access, located on page 14

• Installing the Application Software on the PC, located on page 14

• Installing TekVISA Communications Software on the PC, located on

page 14

• Configuring TekVISA , located on page 15

TDSDVD Optical Storage Analysis Application

Getting Started

Setting Up the Oscilloscope for Remote Access

To set up the oscilloscope for remote LAN access, follow these steps:

1. From the menu bar of the oscilloscope, select Utilities > LAN Server Status. The VXI-11 Server Control menu appears.

2. Select the Start command button to start the server. A VXI-11 Server Control icon appears on the Windows status bar.

To set up the oscilloscope for remote GPIB access, follow these steps:

1. Install a GPIB card in your PC. For information on GPIB cards, you can access the National Instrument web site.

2. Follow the instructions from the manufacturer and connect a GPIB cable between your PC and oscilloscope.

3. From the oscilloscope menu bar, select Utilities> GPIB Configuration.

4. Select the Talk/Listen button and the On option.

5. Select address 1.

Installing Application Software on the PC

To install the TDSDVD application on a PC, follow these steps:

1. Insert the Optional Applications Software for Windows-Based Oscilloscopes CD-ROM in the CD drive on your PC. The PC may automatically start the Installation Browser program. If the PC does not start the Installation Browser program, follow these steps:

2. Select the My Computer icon.

3. In the Exploring - My Computer window, select the D: (CD-ROM) drive and select the Launch.exe file.

4. Follow the on-screen instructions given by the InstallShield Wizard. Select the OK button if prompted to install the JRE (Java Run-time Environment).

5. Reboot the PC to complete the application software installation process.

Installing TekVISA Communications Software on the PC

This application requires TekVISA API drivers to communicate with an oscilloscope over a network. The TekVISA software is the Tektronix version of the PC VISA API drivers.

To install TekVISA software on your PC, follow these steps:

1. Insert the oscilloscope product software CD-ROM disc into your PC CDROM drive.

2. Navigate to the TekVISA directory on the CD-ROM.

14 TDSDVD Optical Storage Analysis Application

Getting Started

3. In the TekVISA directory, double-click Setup.exe to open the TekVISA Install Wizard.

4. Follow the instructions in the Install Wizard. Select Complete when prompted for the installation type.

You can also download the latest TekVISA software from the Tektronix web site: To do so, follow these steps:

1. Access the www.tektronix.com web site.

2. Select Software & Drivers (in the Resources column) to display the Software and Firmware Finder page.

3. Enter tekvisa in the Find by model number or keyword field.

4. Select Go. The search returns a list of the available TekVISA software to download.

5. Select the TekVISA software appropriate for your oscilloscope. View the web page for instructions on how to download TekVISA to your oscilloscope or PC.

Configuring TekVISA

To configure TekVISA software, you must first determine the hostname of the oscilloscope with the TDSDVD application enabled. To do so, follow these steps:

1. Minimize the oscilloscope (select File> Minimize from the menu bar).

2. Right click the Network Neighborhood icon.

3. Select Properties.

4. Select the Identification tab.

5. Write down (take mental note) the oscilloscope name, also referred to as

To configure TekVISA software to communicate with an oscilloscope, follow these steps:

1. On the PC, select Start > Programs > TekVISA > TekVISA

2. Verify that the host name of the oscilloscope matches the name of the

the host name.

Configuration to display the TekVISA configuration menu.

instrument with the GPIB8 designator in the list of TekVISA Remote Hosts.

If the names do not match, you must remove the incorrect instrument name from the list of remote hosts. To remove a name from the list and add a correct name, follow these steps:

1. In the list of Remote Hosts, select the host name with the GPIB8 VISA designator.

TDSDVD Optical Storage Analysis Application

Getting Started

2. Select Remove.

3. Select OK. The PC removes the item.

4. In the Remote Hosts menu, select the Add button to display the Add Remote Host menu.

5. Enter the host name of the oscilloscope with the TDSDVD application enabled in the Host Name field.

6. Enter GPIB8 in the Visa Name field. The application communicates with the oscilloscope only on GPIB8.

7. Select OK.

8. Select the Find button in the TekVISA Resources window. The PC adds the GPIB8::1::INSTR to the list; it may take a few moments for the list to update.

If GPIB8::1::INSTR does not appear in the list, check that your network cable is properly connected and that you have the correct host name. You might also need to work with your system administrator to resolve connectivity problems.

9. Select Quit to exit the TekVISA Configuration window.

Connecting to a System Under Test

Connecting to a System Under Test (SUT)

WARNING: To avoid injury to eyes, wear eye protection if the

possibility of exposure to high-intensity rays or laser radiation exists.

WARNING: To avoid electric shock, remove power from the SUT before attaching a probe to it. Do not touch exposed conductors except with the properly rated probe tips. Refer to the probe manual for proper use.

See Also

Primary Setup: Measuring Data Using Extracted Clock on page 17 Secondary Setup: Measuring Data Using Actual Clock on page 17

16 TDSDVD Optical Storage Analysis Application

Getting Started

Primary Setup: MeasuringData Using an Extracted Clock

Use the primary setup to measure the optical drive data signal using an extracted or ideal (synthesized) clock signal. Connect the optical storage drive to the oscilloscope as shown below.

Secondary Setup: Measuring Data Using the Actual Clock

Use the secondary setup to measure optical data signal using the actual acquired clock signal. Connect the optical storage drive to the oscilloscope as shown below.

TDSDVD Optical Storage Analysis Application

Getting Started

18 TDSDVD Optical Storage Analysis Application

Operating Basics

Running the Application

To run the application on an oscilloscope, select File > Run Application > Optical Storage Analysis from the oscilloscope menu bar.

The application uses a Windows interface. When you run the application, the oscilloscope display shrinks to half size and appears in the top half of the screen, and then Windows loads the application.

Note.

If you get the error message “Exit the currently running application before starting another, it may mean that the application is already running on the PC. You cannot run the application on the PC and an oscilloscope connected to that PC at the same time. Exit the application on the PC, and then start the application again on the oscilloscope.

To run the application on a PC, select Start > Programs > TekApplications > TDSDVD > Optical Storage Analysis.

Note.

If you get the error message “Attempting to run too many applications concurrently., it may mean that the application is already running on the oscilloscope. You cannot run the application on the PC and the oscilloscope at the same time. Exit the application on the oscilloscope, and then start the application again on the PC.

This message can also mean that you have not enabled the LAN or GPIB servers on the oscilloscope, which the TekVISA software is not correctly configured, or the PC has lost communication with the oscilloscope. Refer to Setting Up the Oscilloscope for Remote Access on page 14 for more information.

It takes a few moments to display the TDSDVD application, which is shown next.

TDSDVD Optical Storage Analysis Application

Operating Basics

See Also

The Application Interface on page 20 Exiting the Application on page 25 Taking Measurements Guidelines on page 27

The Application Interface

The following figure shows the TDSDVD application interface, with labels for the key features, and a table listing the UI functions.

20 TDSDVD Optical Storage Analysis Application

Operating Basics

Application User Interface Controls

Item Description

Menu bar Located at the top of the application display and

Area Visual frame that encloses a set of related

Command buttons Menu tabs Menu functions grouped by category. The tabs

Option button Button that defines a particular command or

List box Box that contains a list of items from which you

Box Box in which you can enter text or numeric

Scroll bar Vertical or horizontal bar at the side or bottom of

Browse Button that displays a window where you can

Keyboard button

contains application menus. Selecting a menu item updates the menu area to show applicable menu tabs, parameters, or information

options Buttons in the Control area that initiate an immediate action

displayed depend on which Menu Bar item is selected. Select a tab to display the associated functions

task

can select one item

values, using the keypad or a Multipurpose knob

a display area used to move the display area for better viewing of information

look through a list of directories and files Icon that displays a virtual keyboard that you can use to enter data into a box

See Also

Command Buttons on page 22 Application Menu Bar on page 24

TDSDVD Optical Storage Analysis Application

Operating Basics

Command Buttons

The Command buttons execute key application tasks, including exiting the application, acquiring data for measurements, and displaying key graphical information. The Command buttons are always available.

22 TDSDVD Optical Storage Analysis Application

Operating Basics

The Command Button Options

Button Description

Hide Returns the oscilloscope to full screen display.

Exit Exits (quits) the TDSDVD application. You have

Eye Activates or deactivates the Eye display of the

TIA Activates or deactivates the Time Interval

TEC Activates the Track Error Count panel which

Scan Activates the AutoScroll panel to zoom and

Start/Stop (Free Run)

Start Single Sequence

Reset All

The application is still running but is behind the oscilloscope display

the option to restore the oscilloscope settings to those present prior to starting the application

live HF signal. This mode requires an active signal. Deselecting returns the oscilloscope to the settings present prior to starting the Eye command

Analysis (TIA) display. You must take a Data Pulse Width measurement prior to selecting the TIA button

displays the tracking error count

scroll through the waveform data Starts or stops the measurement in Free Run mode to make continuous acquisitions

Stops measurement acquisition

Starts a single measurement acquisition

Stops measurement acquisition

Clears all measurement results, including plot and histogram statistics

Acq/No Acq Starts or stops any further acquistion of data.

When No Acq is displayed, Start/Stop is disabled and measurements are taken on the last data acquisition

TDSDVD Optical Storage Analysis Application

Operating Basics

Application Menu Bar

The Menu bar contains the application functions, grouped by category. Selecting a menu item displays a drop-down menu list of functions.

You can also select menu items from the keyboard by pressing and holding the Alt key in combination with the letter underlined in the menu or submenu item. For example, to use the keyboard to display the Measurements > Configure panel, press and hold the Alt key, press the M key, and then press the C key.

See Also

The Application Menus on page 57

Minimizing and Maximizingthe Application

To minimize the application, select Measurements > Minimize. This maximizes the oscilloscope and places the application behind the oscilloscope display. The application remains displayed when you minimize the oscilloscope.

To maximize the application from the Windows task bar, select TDSDVD in the Windows task bar.

To maximize the application from the oscilloscope, select the App button on the oscilloscope screen.

Accessing Oscilloscope Functions

When you access oscilloscope functions, the oscilloscope fills the display. You can access oscilloscope functions in the following ways:

• Select the Hide button in the application display to place the application window behind the oscilloscope display.

24 TDSDVD Optical Storage Analysis Application

Operating Basics

• Choose the Menu-bar or Toolbar mode on the oscilloscope and access menus.

• Press front-panel buttons.

To return to the application, select the App button on the oscilloscope screen.

Exiting the Application

To exit the application, select the Exit button. When you exit the application, you can select to keep the oscilloscope setup currently in use with the application or to restore the oscilloscope setup that was present before you started the application.

Application Directories

The application uses specific directories to save and recall setup files and uses specific file name extensions to identify the file type.

The following table lists default directory names.

Directory Used for

C:\Program Files\ TekApplications\tdsdvd C:\TekApplications\tdsdvd\data Saved measurement results

C:\TekApplications\tdsdvd\log Data log files C:\TekApplications\tdsdvd\setup Setup files C:\TekApplications\tdsdvd\waveforms Waveform files C:\TekApplications\tdsdvd\example programs

File Name Extensions

File name extension Description

.csv Comma-separated value file, used to store

.ini Application setup initialization file. The .ini file is saved

.set Oscilloscope setup file that is saved and recalled at the

.wfm Waveform file that can be recalled into reference

Application executable files

list files

Application plug-in example files

measurement data (individual measurement data or logged measurement data)

on the instrument (oscilloscope or PC workstation) that is running the application

same time as an .ini file; both files will have the same name. The .set file is always saved on the oscilloscope

memory

TDSDVD Optical Storage Analysis Application

Operating Basics

26 TDSDVD Optical Storage Analysis Application

Taking Measurements

About Taking Measurements

This section describes the steps to set up and take a measurement, how to replace the default signal process block functions with MATLAB or DLL user-developed software, and other common application tasks. You can also do the application Tutorial, located on page 49, which demonstrates most of the application functions.

These examples assume the following conventions:

• The TDSDVD application is installed and enabled on the oscilloscope.

• The oscilloscope is connected to the system under test (SUT) using the

appropriate probes.

See Also

Installation on page 13 Taking Measurements Guidelines on page 27 Selecting a Measurement Standard on page 31

Taking Measurements Guidelines

Use the following guidelines when setting up and taking measurements with this application:

• The data source signal must be a continuous physical data disk recording of nT pulses with no gaps or non-nT type data.

• The clock period (T) of the data source signal must be constant, but not necessarily known.

• The application does not change the oscilloscope, acquisition record length, or sample rate settings in any of the operation modes, including data and clock Autoset. You must set the desired record length and sample rate for the application to correctly acquire, process, and measure the signal. In general, the sample rate should be at least 10 times the signal clock frequency, and the record length set to display at least 10 to 20 pulses.

• The DVD application measurement accuracy depends on the input parameter settings. The application is a collection of tools designed for general measurement and analysis of optical storage-specific signals without being restricted to a specific standard or signal. As a result, using the application to measure specific signals generally requires iterations between configuring the application parameters and analysis and validation of the measurement results (by viewing the resultant waveforms).

TDSDVD Optical Storage Analysis Application

Taking Measurements

• The Extracted Clock and data/clock Autoset functions are meant to be a convenient way to obtain approximate values for the corresponding parameters, and produce roughly correct measurement results based on minimal user interaction. For more accurate results, use the Ideal (synthesized) clock mode and enter the known clock period. If the clock period is not known, a good starting point is to use the estimated clock period value calculated by the application using the Extracted clock.

You can also enter data/clock threshold and hysteresis values to further refine measurement results. The hysteresis band should be set to a value that allows the application to discriminate between noise and the actual pulses in the signal. The Autoset function will select a sufficient value most of the time. However, the hysteresis of a signal will vary depending on conditions such as probes and test points. Therefore, the hysteresis may need slight adjustments based on these conditions. The threshold value selected by the Autoset function will also vary depending on the conditions described above, so the threshold value may also require minor changes.

• Using a synthesized clock speeds up the application considerably, as calculating the clock period is computationally time-consuming.

• The sampled input signal (live or stored) is not necessarily the signal being measured. If you route the input signal through the Equalizer or Low Pass Filter pre-processing blocks, the application measures the resultant signal from these blocks.

• The Data Source threshold and hysteresis settings apply to the data signal after signal pre-processing, and not to the sampled input source signal. The exception to this is when the signal processing path bypasses all signal process blocks and sends the input signal directly to the application.

• The data threshold and hysteresis parameters directly affect how accurately the application categorizes the nT data pulses (pits and spaces). If the clock is Extracted, then the accuracy of the clock period (T) estimation is another factor directly affecting the nT pulse categorization, and depends on its turn on the same data threshold and hysteresis.

• The Slicer Initial Threshold parameter is important. Because the Slicer bandwidth is usually small, an incorrect initial threshold setting can generate very long pulses categorized as having a very large nT (as they are offset heavily from the threshold). View the Leveled waveform signal (View > Waveforms > Leveled) and verify that the signal is centered on the zero volt line, as shown in the following figure.

28 TDSDVD Optical Storage Analysis Application

Taking Measurements

If the Slicer Initial Threshold parameter is incorrect, the Leveled signal is not centered on zero volts, but slowly adjusts to the zero volt level depending on the Slicer bandwidth value, as shown in the below figure.

If you are measuring from the LPF output then a good initial value for the Slicer Initial Threshold parameter is the Autoset calculated data Threshold parameter value. Viewing the LPF signal (which is the Slicer input) also gives good basis for estimating an Initial Threshold value for the slicer.

TDSDVD Optical Storage Analysis Application

Taking Measurements

Amplitude-related measurements depend on peak-to-peak and decision level measurements on specific nT pulse pairs (and adjacent pit and space with the same nT). A lack of results for these measurements can be because specified nT pairs were not found in the input signal. The fact that both pulses and spaces for a specified nT were found (for example, as indicated by getting results for High and Low measurements) does not mean that any pit or space with the specified nT was adjacent to another specified nT pit or space. If no results are returned for a measurement such as Asymmetry, the Divisor nT value in the Configure panel may need to be adjusted. In the Results panel, select the detailed results for a measurement that does have results and search for a row that has the same nT value for both the Subject and Adjacent columns. Enter this value in the Divisor nT field of the Configure panel.

Acquiring the Data Signal

To acquire the optical storage drive signal, follow these steps:

1. Connect the oscilloscope to the SUT. The default application signal source input is Ch 1, and the default clock signal source input is Ch 2.

2. Push the oscilloscope AUTOSET button to acquire and display a signal.

3. Change the oscilloscope horizontal settings to adjust the sample rate. In general, the sample rate should be at least 10 times the signal clock frequency, and the record length set to display at least 10 to 20 pulses.

Displaying an Eye Waveform

The Eye button displays an eye waveform of the active data signal. You can use this to validate the input data source signal.

30 TDSDVD Optical Storage Analysis Application

Taking Measurements

To view the eye display, follow these steps:

1. Set up the oscilloscope to acquire an active data signal. You cannot

2. Select the Eye command button.

To display a cleaner eye waveform, set the oscilloscope bandwidth to 20 MHz.

display an eye waveform on a stored reference or math waveform.

Selecting a Standard

Selecting a MeasurementStandard

To select a measurement standard, follow these steps:

1. Select Measurements > Standards to display the Measurements Standards menu.

2. Select the Standards button to display a list of available standards.

3. Select a standard from the list. Choosing a standard presets most measurement parameters.

You can also select Custom and then configure the signal process path and measurement parameters to create your own custom measurement setups, and then use the File > Save/Recall menu functions to save and recall custom measurement setup files.

TDSDVD Optical Storage Analysis Application

Taking Measurements

Setting Up the Input Options

Data Signal Input Options

To set the Data Signal options, follow these steps:

1. Select Measurements > Inputs to display the Inputs menu. The menu may be blank except for the Diagram Show/Hide buttons.

2. Select the Diagram Show button to display the Inputs Block Diagram (IBD).

3. Select the Data Signal button on the IBD diagram. The Inputs menu updates to show the data signal input parameter fields.

4. Select the Source button to display the source list.

5. Select the data signal source (Ch1-Ch4, Ref1-Ref4, Math1-Math4). The default value is Ch1.

6. If necessary for your measurement, change the Pit/Space Shortest and Longest parameter values.

7. Select the Autoset button to automatically set the data signal threshold and hysteresis parameter values based on the actual data waveform characteristics. You can also enter your own values for these parameters.

See Also

Using Cursors to Measure Part of a Waveform on page 38

32 TDSDVD Optical Storage Analysis Application

Taking Measurements

Clock Signal Input Options

The Clock Signal menu sets the clock signal source, threshold, and hysteresis parameters. The actual clock signal is used for analyzing measurements when you select Clock Signal and Clock Source on the IBD.

To set the Clock Signal parameters, follow these steps:

1. Select Measurements > Inputs to display the Inputs menu. The menu may be blank except for the Diagram Show/Hide buttons.

2. Select the Diagram Show button to display the Inputs Block Diagram (IBD) menu.

3. Select the Clock Signal button to display the Clock Signal parameter fields.

4. Select the Source button to display the source list.

5. Select the clock signal source (Ch1-Ch4, Ref1-Ref4, Math1-Math4). The default value is Ch2.

6. Select the Autoset button to automatically set the threshold and hysteresis values based on the clock waveform characteristics. You can also enter your own values for these parameters. Refer to Input Signal

Parameters on page 87 for information on the Clock Signal input

parameters.

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Taking Measurements

Ideal Clock Period Option

The Ideal Clock menu sets the synthesized clock signal period. The synthesized clock signal is used for analyzing measurements when you select Ideal Clock and Synth Clock on the IBD.

To set the Ideal Clock Period, follow these steps:

1. Select Measurements > Inputs to display the Inputs menu.

2. Select the Diagram Show button to display the Inputs Block Diagram

3. Select the Ideal Clock button to display the Period option.

4. Use the general purpose knob or keyboard to change the value. Refer to

Equalizer Options

The Equalizer Coefficients menu lets you view and set the equalizer coefficient options.

Note.

The default values are based on the selected standard. Changing any equalizer option causes the application to change the standard type to Custom.

To set equalizer options, follow these steps:

1. Select Measurements > Inputs to display the Inputs menu.

(IBD) menu.

Input Signal Parameters on page 89 for information on the Ideal Clock values.

2. Select the Diagram Show button to display the Inputs Block Diagram (IBD) menu.

3. Select the Equalizer button to display the Equalizer Coefficients options menu.

34 TDSDVD Optical Storage Analysis Application

Taking Measurements

4. Use the general purpose knob or keyboard to change a value. Refer to

See Also

Equalizer Coefficient Parameters on page 90 for information on the equalizer parameter values and ranges.

Default Standards Parameters Table 1 on page 87 Low Pass Filter Options on page 35 Slicer Options on page 36 Phase-Locked Loop Options on page 37

Low Pass Filter Options

The Low Pass Filter menu lets you view and set the low pass filter bandwidth corner frequency.

Note.

Default parameter values are based on the selected standard. Changing the Low Pass Filter option causes the application to change the standard type to Custom.

To set low pass filter options, follow these steps:

1. Select Measurements > Inputs to display the Inputs menu.

2. Select the Diagram Show button to display the Inputs Block Diagram (IBD) menu.

3. Select the Low Pass Filter button to display the Low Pass Filter menu.

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Taking Measurements

4. Use the general purpose knob or keyboard to change the value. Refer to Low Pass Filter Parameters on page 90 for information on the Bandwidth parameter values and ranges.

See Also

Default Standards Parameters Table 1 on page 87 Equalizer Options on page 34 Slicer Options on page 36 Phase-Locked Loop Options on page 37

Slicer Options

The Slicer menu lets you view and set the Slicer bandwidth corner frequency and feedback loop initial threshold voltage.

Note.

Default parameter values are based on the selected standard. Changing the Slicer options causes the application to change the standard type to Custom.

To set Slicer options, follow these steps:

1. Select Measurements > Inputs to display the Inputs menu.

2. Select the Diagram Show button to display the Inputs Block Diagram (IBD) menu.

3. Select the Slicer button to display the Slicer menu.

36 TDSDVD Optical Storage Analysis Application

Taking Measurements

4. Use the general purpose knob or keyboard to change a value. Refer to

See Also

Slicer Parameters on page 90 for information on the Bandwidth and Initial Threshold parameter values and ranges.

Default Standards Parameters Table 1 on page 87 Equalizer Options on page 34 Low Pass Filter Options on page 35 Phase-Locked Loop Options on page 37

Phase-Locked Loop Options

The Phase-Locked Loop (PLL) menu lets you view and set the open loop bandwidth (BW) and PLL type based on the measurement standard. The filter transfer function characteristics chart changes depending on which PLL type you select.

Note.

Default parameter values are based on the selected standard. Changing the PLL parameters causes the application to change the standard type to Custom.

To set PLL options, follow these steps:

1. Select Measurements > Inputs to display the Inputs menu.

2. Select the Diagram Show button to display the Inputs Block Diagram (IBD) menu.

3. Select the PLL button to display the Phase-Locked Loop menu.

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Taking Measurements

Use the general purpose knob or keyboard to change a value. Refer to PhaseLocked Loop Parameters on page 91 for information on the Bandwidth and PLL Type parameter values and ranges.

See Also

Default Standards Parameters Table 1 on page 87 Equalizer Options on page 34 Low Pass Filter Options on page 35 Slicer Options on page 36

Using Cursors to Measure Part of a Waveform

To use cursor gating to mark your measurements, follow these steps:

1. Select Measurements > Gates to display the Gated By menu.

2. Select the Cursors button. Vertical cursors appear on the oscilloscope screen.

3. Use the general purpose knobs, mouse, or touch screen to move the cursors to select the portion of the waveform to analyze.

4. Select and configure your measurements.

5. Select the Start/Stop Free Run or Start a Single Sequence Control button to start the signal acquisition. The application displays the Results Summary area with a table listing a summary of the statistical measurement values for all selected measurements, for the area within the cursors.

6. If you selected the Start/Stop Free Run command button, select that button again to stop signal acquisition.

7. To turn off cursor gating, select Measurements > Gates and select the None button. Selecting None sets the application to evaluate the entire signal.

See Also

Measurements Gates Menu on page 69

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Taking Measurements

Selecting and Configuring Measurements

Selecting Measurements

To select one or more measurements, follow these steps:

1. Select Measurements > Select to display the Measurement Select menu. There are three measurement type groups: Amplitude, Modulation, and Time.

2. Select the measurements you want to take. You can select up to six measurements, in any combination, from any of the measurement type groups.

Note.

To display a Time Interval Analysis (TIA) plot, you must select Data Pulse Width as one of your measurements.

Configuring Measurements

To configure one or more measurements, follow these steps:

1. Select Measurements > Configure to display the Configure menu. Available measurements (that were selected in the Measurement Select menu) are listed on the button icons at the top of the menu, in the order they were selected.

2. Select a measurement button. The menu highlights the available parameter fields for that measurement, and grays-out any fields that do not apply to the selected measurement.

3. Enter any changes to these fields as necessary for your measurement.

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Note.

All measurements use the same set of parameters: you cannot set different parameter values for each measurement. For example, you cannot set the Adj Pos value to Leading for one measurement and then set it to Trailing for a different measurement.

See Also

Saving a Setup on page 42

Taking Measurements

To take a measurement, follow these steps:

1. Select the Start/Stop Free Run or Start a Single Sequence Control button to start the signal acquisition. The application displays the Results Summary area with a table listing a summary of the statistical measurement values for all selected measurements.

2. If you selected the Start/Stop Free Run command button, select that button again to stop signal acquisition.

Note.

Do not change oscilloscope settings while taking a measurement. Doing so stops the measurement acquisition.

Viewing Results

Viewing Measurement Results

To view measurement results, follow these steps:

1. If not already displayed, select View > Results to display the Results Summary area with a table listing a summary of the statistical measurement values for all selected measurements.

2. Select a measurement tab in Results Summary to display the Results Measurement area that contains more information for that measurement, listed in order of nT subject/adjacent pairs.

3. In the Results Measurement area, select a button in the Details column to display the Measurement Details area and plot or save the selected nT subject/adjacent pair measurement values.

Using Track Error Count

Track Error Count (TEC) counts the number of pulses (pit and/or spaces) in the track error signal. To use the Track Error Count, follow these steps:

1. Only configure the settings for Data Source, Threshold and Hysteresis in the Measurement Inputs menu. The input threshold and hysteresis values, as

40 TDSDVD Optical Storage Analysis Application

Taking Measurements

well as the outputs of the various signal-processing blocks, can affect the TEC value.

2. Select the TEC button on the Control panel, or select Utilities > Track Error Count, to display the Track Error Count panel.

3. Select the Single or Start/Stop Free Run button from the Control Panel. The track error count appears in the Track Error Count field.

Note.

No other measurements are executed, even if they are selected on the Measurement Select panel.

Displaying a Time Interval Analysis (TIA) Plot

The TIA (Time Interval Analysis) command button displays time interval data from the Data Pulse Width measurement.

To display the TIA data, follow these steps:

1. Select Measurement > Select.

2. Select the Data Pulse Width measurement.

3. Select the Start/Stop Run Free or the Run One command button.

4. If you selected the Start/Stop button, select it again to stop data acquisition.

5. Select the TIA command button to display the Time Interval Analysis plot.

6. Select Ctrl on the TIA plot to display the Bin Resolution menu and change the Bin Resolution if needed.

If you do not take a Data Pulse width measurement prior to selecting the TIA button, or there is no Pulse Width measurement data, the application displays a TIA Instructions message (below). The message lists the process steps to do to display a TIA plot.

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Taking Measurements

Using AutoScroll

To use AutoScroll, follow these steps:

1. Go to Utilities> Autoscroll. You can also select the Scan button on the Control Panel to go directly to the AutoScroll panel.

2. Select the Off (default) button to toggle AutoScroll to On.

3. Select Position to enter a percentage of position of the oscilloscope screen.

4. Select Step Size to enter the size of the step.

5. Select Scale to set the scaling.

6. Select the Start/Stop Free Run button on the Control Panel.

7. AutoScroll automatically scrolls the zoom window through the record.

See Also

AutoScroll Menu on page 85

Saving and Recalling Setups

Saving a Setup

To save a measurement configuration to a file, follow these steps:

1. Select File > Save/Recall to display the Save/Recall menu.

2. Select Save to display the Enter/Select File Name to Save dialog.

3. Select or enter a file name. The menu sets the folder location, which is C:\TekApplications\tdsdvd\setup.

4. Select the Save button. The application saves the oscilloscope setup information to a .set file, and the application setup information to a .ini file.

42 TDSDVD Optical Storage Analysis Application

Taking Measurements

Note.

Setup and initialization files must both be located in the directory C:\TekApplications\tdsdvd\setup, for both oscilloscope and PC application operation.

Recalling a SavedSetup

To recall a measurement configuration from a saved setup file, follow these steps:

1. Select File > Save/Recall.

2. Select the Recall… button to display the Select File to Recall window.

3. Select the .ini setup file name to recall. The menu uses the folder location C:\TekApplications\tdsdvd\setup.

4. Select Open. The application loads the application initialization and oscilloscope setup files and reconfigures the application and oscilloscope.

Note.

Setup and initialization files must both be located in the directory C:\TekApplications\tdsdvd\setup, for both oscilloscope and PC application operation.

Restoring Default Settings

To restore the application default settings, follow these steps:

1. Select File > Save/Recall.

2. Select the Default button.

Saving Results to a File

Logging a Measurement to a File

To save a series of measurement results for one measurement to a data log file, follow these steps:

1. Select Log > Statistics to display the Data Logging menu.

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Taking Measurements

2. Select the measurement button in the Selected Measurements area to select the measurement to log. You can log up to six measurements at a time, but you must select and enable each measurement for logging.

3. To save the log file to a file name or directory other than the default name and directory, select the Browse button to display the Open file dialog. Specify a new file name and/or directory. The default directory is C:\TekApplications\tdsdvd\log. The default file name is an abbreviation of the measurement name with a .csv extension.

4. Select the Logging button to On.

5. Repeat steps 2-4 for each measurement you want to log.

6. Select the Start/Stop command button to start acquiring multiple measurements.

7. Select the Start/Stop command button to stop acquiring measurements after a period of time.

8. Select Log > Statistics to display the Data Logging menu.

9. Select the Logging button to Off to close the data log file. You can now open and view the log file.

See Also

Viewing a Data Log File on page 44 Data Log File Format on page 45 Data Log File Example on page 45

Viewing a Data Log File

You can open the .csv data log file in a spreadsheet, database, text editor or data analysis program for further analysis.

You can use Notepad or Wordpad to quickly view the results in the data log file.

See Also

44 TDSDVD Optical Storage Analysis Application

Taking Measurements

Data Log File Format on page 45 Data Log File Example on page 45

Data Log File Format

The data log file consists of one header row and rows of logged information. The header row contains the application name, the version number of the application, and the date and time on which the file was created. The remaining rows contain information for the measurements. The information will vary with the measurements being logged.

Note.

If you are using a GPIB program to execute the application, you can add your own annotation to the data log file by using the logAnnotate GPIB command. You can add information consisting of up to 20 characters; the custom information will appear after the date and time in the rows of logged data.

See Also

Logging a Measurement to a File on page 43 Viewing a Data Log File on page 44

Data Log File Example

The following is an example of a Decision Level measurement log file, as viewed with Notepad:

TDSDVD,1.0 (7/20/02),Wed Jul 24 15:28:54 PDT 2002,

Measurement,Dec Level

Data Source,Ch1

Clock Source,Ch2

Gated By,None

Standard,CUSTOM

Input Signal Type,HF

Output Signal Type,LPF

Output Clock Type,Extracted

Data Hysteresis,0.3

Clock Hysteresis,0.1

Data Threshold,-0.053

Clock Threshold,0.0

Acq#, Mean, Min, Max, Std Dev, Population

0, -0.0366, -0.0750, 0.02622, 0.01906, 811.0

1, -0.0369, -0.0739, 0.02548, 0.01897, 816.0

TDSDVD Optical Storage Analysis Application

Taking Measurements

2, -0.0363, -0.0750, 0.02574, 0.01918, 824.0

3, -0.0371, -0.0750, 0.02503, 0.01894, 820.0

4, -0.0366, -0.0755, 0.02535, 0.01899, 816.0

5, -0.0361, -0.0749, 0.02590, 0.01938, 808.0

6, -0.0364, -0.0743, 0.02572, 0.01903, 806.0

7, -0.0370, -0.0748, 0.02518, 0.01905, 812.0

8, -0.0368, -0.0748, 0.02500, 0.01904, 810.0

9, -0.0370, -0.0746, 0.02514, 0.01909, 814.0

10, -0.0363, -0.0750, 0.02577, 0.01902, 816.0

11, -0.0363, -0.0830, 0.02550, 0.01907, 811.0

12, -0.0361, -0.0741, 0.02591, 0.01896, 816.0

13, -0.0364, -0.0747, 0.02545, 0.01891, 818.0

14, -0.0366, -0.0745, 0.02532, 0.01905, 811.0

Using Custom Plug-In Processes

Using the Plug-In Feature

To select a user-defined plug-in process, follow these steps:

1. Select Measurements > Plug-In to display the Plug-in Setup menu.

2. Select the Custom button.

3. Select the Plug-in Type drop-down list button for the block type you are replacing.

4. Select your own custom .dll or MATLAB file. If you selected MATLAB, use the Browse button to select a filename of the plug-in.

During the next measurement acquisition, the application passes waveform data to the specified plug-in file, which processes the data and returns the results to the application.

See Also

MATLAB Plug-in Usage Conventions on page 74 DLL Plug-in Usage Conventions on page 74 Replacing the Built-In Low Pass Filter with a MATLAB Process on page 46 Replacing the Built-in Equalizer with a DLL process on page 47

Replacing the Built-In Low Pass Filter with a MATLAB Process

The following steps describe how to substitute a MATLAB-based (.M file) 4thorder Butterworth Low Pass Filter for the built-in 6 Filter.

-order Bessel Low Pass

Note.

MATLAB version 6.1 (or later) must be installed on the oscilloscope or PC that is running the application.

46 TDSDVD Optical Storage Analysis Application

Taking Measurements

1. Make sure you can run the Tektronix-provided file tekLPF.m in MATLAB.

2. Copy the file tekLPF.m (located at C:\TekApplications\tdsdvd\Example Programs) under another file name in the same directory. Make sure to include the .m extension.

3. Edit the newly created file and replace the line runExampleJavaorMATLAB = 1; with runExampleJavaorMATLAB = 0;

4. Save the file.

5. In the application, select the Measurements > Plug-in to display the Plug-in menu.

6. Select the Custom button.

7. Select the LPF list box and select MATLAB from the list.

8. Select the Browse button associated with the LPF field to display a file open menu.

9. Select the file name of the .m file you just created.

10. Select Open. The application closes the file menu and sets the Low Pass Filter process block to use the Plug-in MATLAB file instead of the built-in process.

Replacing the Built-in Equalizer with a DLL process

The following steps describe how to substitute a custom .dll equalizer process for the built-in equalizer process.

1. Create a new .dll file for your custom equalizer process.

2. Save the file. You must use a specific name for the file, and save the file to a particular directory. Refer to DLL Plug-in Usage Conventions on page 74 for information on custom .dll file naming and location conventions.

TDSDVD Optical Storage Analysis Application

Taking Measurements

3. In the application, select the Measurements > Plug-in tab to display the Plug-in menu.

4. Select the Custom button.

5. Select the EQ button and select DLL from the list. The application sets the Equalizer process block to use the custom .dll process file instead of the built-in process.

See Also

Replacing the Built-In Low Pass Filter with a MATLAB Process on page 46

48 TDSDVD Optical Storage Analysis Application

Tutorial

Introduction to the Tutorial

This tutorial teaches you how to set up the application, take a measurement, view the results, and save the results.

Tutorial Conventions

• This tutorial assumes that you have correctly installed the application onto an oscilloscope. If you have not done so, go to Installation on page 13 for information on installing the application.

• Run this tutorial from an application that is running on an oscilloscope.

• Perform the tutorial steps in the order listed in order to obtain the results

shown in the tutorial.

See Also

Stopping the Tutorial on page 55 Returning to the Tutorial on page 56

Setting up the Oscilloscope

To set up the oscilloscope, follow these steps:

1. In the oscilloscope menu bar, select File > Recall Default Setup to set the oscilloscope to the default factory settings.

2. Push the individual CH 1, CH 2, CH 3, and CH 4 buttons as needed to remove active waveforms from the display.

Recalling a Waveform

The application includes a waveform file that you can use with this tutorial.

To recall the tutorial waveform file to Ref1 on to the oscilloscope, follow these steps:

1. In the oscilloscope menu bar, select File > Reference Waveforms > Reference Setup.

2. Select the Ref 1 tab.

3. Select the Recall button. Navigate to the C:\TekApplications\tdsdvd\waveforms directory.

TDSDVD Optical Storage Analysis Application

Tutorial

4. Select the 50k-DVD-ROM.wfm file.

5. Select the Recall button.

Starting the Application

Note.

The application must be installed and enabled on the oscilloscope.

To start the application, go to the oscilloscope menu bar and select File > Run Application > Optical Storage Analysis. The application takes a few moments to start up.

For this tutorial you will use the DVD-ROM standard, which is the default standard.

Setting Up the Signal Source

Before you can take a measurement, you must select the signal standard, source type, and then define the signal options.

To set up the signal standard and source, follow these steps:

1. In the application menu bar, select Measurements > Inputs.

2. Select the Diagram Show button to display the Inputs Block Diagram window.

3. Select the Data Signal button in the diagram. The Inputs menu updates to show the data signal input parameter fields.

4. Select Ref1 from the Source drop-down list.

5. Select the Autoset button to set the signal threshold and hysteresis values based on the actual waveform.

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Tutorial

Selecting the Measurement

For this tutorial you will take a Data Pulse Width measurement. To take a Data Pulse Width measurement, follow these steps:

1. Select Measurements > Select to display the Select Measurement menu.

2. Select the Data Pulse Width button.

Configuring the Me asurement

Each measurement has a number of options you can adjust. Selecting a standard pre-defines many of these options. For this tutorial, you will change the Subject From n and the Adjacent Position parameters for the Data Pulse Width measurement.

To change the measurement configuration parameters, follow these steps:

1. Select Measurements > Configure to display the Measurement Configure menu.

2. Select the Data PW button. The menu highlights the options associated with the Data Pulse Width measurement.

3. In the Subject nT area, change the From n = value to one (1)

4. In the Adj Pos area, select Leading OR Trailing from the list box.

5. Leave all other options at their default values.

TDSDVD Optical Storage Analysis Application

Tutorial

Taking the Measurement

You are now ready to take the Data Pulse Width measurement.

To take the measurement, select the Start Single Sequence command button. The application analyzes the signal and then displays the View Results menu to display the measurement results summary data, as shown below. The View Summary menu shows overall statistical information for the measurement.

Note also that the summary results include the clock period value (T) in the lower left corner. This is the clock period that was extracted (recovered) from the data signal.

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Viewing the Results

You can view more detailed information about the Data Pulse Width measurement, including measurements listed by nT, and graphical plots of listed nT values.

To view more detailed information, select the Data PW tab. The application displays the View Results Measurement panel, as shown below. The measurement panel lists the statistics for each subject and adjacent nT measurement, listed in ascending order, subtotals for each group of subject measurements, and a measurement total (at the bottom of the list).

The Details column lets you select a particular subject/adjacent nT measurement and display the measurement values as a linear plot, a histogram, or as a list of values.

TDSDVD Optical Storage Analysis Application

Tutorial

Displaying a Measurement Histogram

To display a histogram plot of the total Data Pulse Width measurement value, follow these steps:

1. Scroll to the bottom of the measurement list

2. Select the button in the Details column adjacent to the Total label in the Subj column. This displays the Measurement Details area and plots the selected measurement data as a linear graph.

3. In the Measurement Details area, select the Hist button. The area redraws the data as a histogram, as shown below.

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Displaying a Time Interval Analysis (TIA) plot

To display a Time Interval Analysis plot (which uses the Data Pulse Width measurement values), select the TIA command button. The application displays the TIA plot, as shown below.

Saving the Measurement Data

To save the measurement results to a data log file, follow these steps:

1. From the application menu bar, select Log > Statistics. The application displays the Data Logging menu.

2. Select the measurement to log. For this tutorial, only the Data Pulse Width measurement is available, so select the Data PW button.

3. Select the Save Current button to save the Data Pulse Width measurement. The application saves each measurement in a different file, with the measurement type as the default name. For this tutorial, the application saved the data in file Data PW.csv, in the C:\TekApplications\TDSDVD\log directory.

Note.

The format of the log file contents depends on the measurement.

You have completed the TDSDVD application tutorial.

Stopping the Tutorial

If you need more than one session to complete the tutorial lessons, you can stop the tutorial and return to it another time.

To save the application setup and stop your session, refer to Saving a Setup on page 42.

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Tutorial

Returning to the Tutorial

To return to the tutorial setup, you can start the application and then recall the saved setup. To recall the application setup, refer to Recalling a Saved Setup on page 43.

56 TDSDVD Optical Storage Analysis Application

Reference

Menus

The following sections provide information on specific application menu functions.

The File Menu

The File menu provides the following functions:

The File Menu The Measurements Menu The View Menu The Log Menu The Utilities Menu The Help Menu

• Save/Recall saves and recalls application setup information. Use this to save and restore standard and custom measurement configurations.

• Minimize minimizes the application window onto the Windows task bar.

• Hide hides the application window.

• Exit closes (quits) the application. You have the option to restore the

oscilloscope settings that were present prior to starting the application.

Save/Recall Menu

The Save/Recall menu lets you save and recall application measurement configuration settings to a file. You also use this menu to recall the default application settings.

TDSDVD Optical Storage Analysis Application

Reference

Save/Recall Menu Options

Option Description

Save… Specify a file in which to save the

application setup

Recall… Select a file from which to recall the

application setup

Default Restores the default application setup

values File name for Save/Recall

Displays the name of the last file used to

save or recall a setup

See Also

Saving a Setup on page 42 Recalling a Saved Setup on page 43 Restoring Default Settings on page 43

The Measurements Menu

The Measurements menu contains measurement-related menus. Use the Measurements menu for the following operations:

• Measurements > Standards selects the standard for which you are taking measurements, or selects Custom to let you define your own measurement setups and save them using the File > Save/Recall function.

• Measurements >Inputs sets the signal input and processing path parameters.

• Measurements >Gates enables using cursors to do measurements on a specified portion of the input waveform.

• Measurements >Select selects the measurement to take on the input signal. You can select up to six measurements at one time, in any combination of measurement type.

• Measurements >Configure sets the subject and adjacent nT ranges, as well as adjacent position, data/clock edge, data polarity, and other parameters for the measurements. The selected measurement enables the applicable parameters for that measurement.

• Measurements >Plug-In enables using of MATLAB or .dll plug-in extensions to replace the built-in Equalizer, Low Pass Filter, Slicer, and Phase-Locked Loop signal processing functions.

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Reference

The Standards Menu

The Standards menu consists of a drop-down list containing supported measurement standards. Select the Standards button to display the Standards drop-down list, and then select a standard. Selecting a standard sets many of the default measurement options.

If you are testing for a standard that is not in the list, select Custom from the list. Then use the Inputs, Gates, Select, and Configure menus to set your custom measurement parameters. You can then save the custom measurement settings by selecting File > Save/Recall and specifying a file name and directory in which to store the settings.

See Also

Default Standards Parameters, Table 1 on page 87

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Reference

The Inputs Menu

The Measurement Inputs menu provides controls for setting input signal type and processing path parameters. Some parameters are automatically filled in with values based on the selected standard. The default screen does not list any parameter fields.

To display input parameter fields, select the Diagram Show button to display the Inputs Block Diagram (IBD) and then select a button. The Measurements Input menu then updates to display the parameter fields associated with the selected IBD button. For example, the following figure shows the Data Signal input parameters, which are displayed after selecting Data Signal on the IBD.

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Reference

The Inputs Block Diagram (IBD)

You can define, the signal input sources, the signal processing to apply to the input data, and the signal output to measure with the application from the Inputs Block Diagram, which is opened from the Measurements > Inputs menu.

The default IBD input and output signal type is HF Data (data that is from the optical drive mechanism and has not been preprocessed). The default value for the clock signal source is Extracted (recovered from the data signal).

You configure the signal path by selecting the buttons. Selecting a button either changes the signal path route or displays fields in which to enter signal input and processor parameters. To close the IBD, select Hide.

There are three groups of Inputs Block Diagram options:

• Signal Input Options

• Signal Process Options

• Signal Output Options

TDSDVD Optical Storage Analysis Application

Reference

Signal Input Options

Selecting Signal Input menu options updates the Inputs menu to show the data and clock signal parameters, as well as select the data signal input type (Equalized, HF Data, or Filtered).

Option/button Description

Data Signal Displays data signal fields for setting the data

input source, threshold, and hysteresis

parameters Input Signal Type Equalized * HF Data * Filtered *

Clock Signal Displays clock signal fields for setting the clock

Ideal Clock Displays a clock period field for setting the clock

* Selecting a button can change the current process flow path. For example, if the selected Input type is Filtered, and you select the Output Signal Type as Equalized, the application changes the Input Signal Type to Equalized

Sets the input signal type applied to the signal

processing block. Selecting an input type routes

the signal as appropriate for that type of signal.

For example, selecting HF Data routes the input

signal to the Equalizer process, whereas

selecting Filtered routes the input signal to the

Slicer process. Only one input type is active at a

time.

input source, threshold, and hysteresis

parameters

period of the ideal (synthesized) clock signal

generated by the application.

See Also

Data Signal Menu on page 62 Clock Signal Menu on page 63 Ideal Clock Menu on page 64

Data Signal Menu

The Data Signal menu sets the data signal source, threshold, and hysteresis parameters.

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Data Signal Menu Options

Option/button Description

Diagram Hide/Show

Source Sets the input source for the data signal. Available

Pit/Space Shortest Longest Treshold * Sets the data threshold voltage used to calculate

Hysteresis * Sets the hysteresis voltage, centered on the

Autoset ** Analyzes the post-processing signals and

* The threshold and hysteresis settings apply to the signal (data or clock) at the output of the signal processing blocks that are then measured by the application ** Autoset adjusts threshold and hysteresis to the best values it can determine. You may need to manually adjust these values to obtain optimum measurement results

Displays or hides (closes) the Inputs Block Diagram (IBD), which you use to set data and clock signal input and processing path parameters

sources are CH1 to Ch4, Math1 to Math4, and Ref1 to Ref4 Sets the range (Shortest to Longest) of nT pulses (pit or space) to analyze in the application. The value range is 0 to 24

the signal pulse width

threshold voltage, used to determine a false (glitch) data pulse from a valid pulse

automatically sets the threshold and hysteresis values based on the signal characteristics

Refer to Input Signal Parameters on page 89 for information on the Clock Signal input parameters.

Clock Signal Menu

The Clock Signal menu sets the clock signal source threshold, and hysteresis parameters. Use this menu if you are using an actual clock signal from the SUT. The actual clock signal is used for analyzing measurements when you select the Clock Signal and Clock Source buttons on the IBD.

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Clock Signal Menu Options

Option/button Description

Diagram Hide/Show

Source Sets the input source for the clock signal.

Threshold* Sets the clock threshold voltage Hysteresis * Sets the hysteresis voltage, centered on the

Autoset ** Analyzes the post-processing signals and

Displays or hides (closes) the Inputs Block Diagram (IBD), which you use to set data and clock signal input and processing path parameters

Available sources are CH1 to Ch4, Math1 to Math4, and Ref1 to Ref4

threshold voltage, used to determine a false (glitch) clock pulse from a valid pulse

automatically sets the clock threshold and hysteresis values based on the clock signal characteristics

Refer to Input Signal Parameters on page 89 for information on the Clock Signal input parameters.

Ideal Clock Configuration Menu

The Ideal Clock menu sets the synthesized clock signal period. The synthesized clock signal is used for analyzing measurements when you select the Ideal Clock and Synth Clock buttons on the IBD panel.

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Option/button Description

Diagram Hide/Show

Period Sets the ideal (synthesized) clock period value

Displays or hides (closes) the Inputs Block Diagram (IBD), which you use to set data and clock signal input and processing path parameters

used by the application for measurements

Refer to Input Signal Parameters on page 89 for information on the Ideal Clock parameters.

Signal Process Options

Selecting the Signal Process menu options updates the Inputs menu to show the Equalizer, Low Pass Filter, Slicer, and Phase-Locked Loop signal processing parameter fields.

Option/button Description

Equalizer * Displays the Equalizer Coefficients menu where

you can set the equalizer coefficient equation

parameters Low Pass Filter * Displays the Low Pass Filter menu where you

can set the low pass filter bandwidth parameter Slicer * Displays the Slicer menu where you can set the

slicer bandwidth and initial threshold voltage

parameters PLL * Displays the Phase-Locked Loop menu where

you can set the phase-locked loop corner

bandwidth and PLL data type * The default process block parameters are set by the selected measurement standard. Changing any of these values resets the measurement standard to Custom

See Also

Equalizer Coefficients Menu on page 66 Low Pass Filter Menu on page 66 Slicer Menu on page 67 Phase-Locked Loop Menu on page 68 Signal Output Options on page 68 Equalizer Coefficient Parameters on page 90 Low Pass Filter Parameters on page 90 Slicer Parameters on page 90 Phase-Locked Loop Parameters on page 91

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Equalizer Coefficients Menu

The Equalizer Coefficients menu lets you view and set the equalizer coefficient parameters. To set equalizer coefficients, select the Equalizer block in the Inputs Block Diagram (IBD). Use the general purpose knob or keyboard to change the default value of a coefficient. Refer to Equalizer Coefficient Parameters on page 90 for information on the equalizer parameter values and ranges.

Note.

Default parameter values are based on the selected standard. Changing any of the Equalizer parameters changes the input standard type to Custom.

Low Pass Filter Menu

The Low Pass Filter menu lets you view and set the low pass filter bandwidth corner frequency.

Note.

Default parameter values are based on the selected standard. Changing the Low Pass Filter parameter causes the application to change the standard type to Custom.

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Refer to Low Pass Filter Parameters on page 90 for information on the Bandwidth parameter.

Slicer Configuration Menu

The Slicer menu lets you view and set the Slicer bandwidth corner frequency and feedback loop initial threshold voltage.

Note.

Default parameter values are based on the selected standard. Changing the Slicer bandwidth parameter changes the input standard type to Custom. Changing the initial threshold value does not change the input standard to Custom.

Refer to Slicer Parameters on page 90 for information on the Bandwidth and Initial Threshold parameters.

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Phase-Locked Loop Configuration Menu

The Phase-Locked Loop (PLL) menu lets you view and set the open loop bandwidth (fBW) and PLL type based on the measurement standard. The filter transfer function characteristics chart changes depending on which PLL type you select.

Note.

Default parameter values are based on the selected standard. Changing the PLL parameters causes the application to change the standard type to Custom.

Refer to Phase-Locked Loop Parameters on page 91 for information on the Bandwidth and PLL Type parameters.

Signal Output Options

Selecting the Signal Output menu options sets which data and clock signals to route into the application for measurement.

Option/button Description

Output Signal Type Equalized * HF Data * Filtered * Output Clock Type Extracted Clock Source Synth Clock * Selecting a button can change the current process flow path. For example, if the selected Input type is Filtered, and you select the Output Signal Type as Equalized, the application changes the Input Signal Type to Equalized

Sets the signal type to be measured by the application. Only one output (measured) signal type can be active at a time.

Sets the clock signal type used by the application for taking measurements. Only one measured clock type can be active at a time.

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The Measurements Gates Menu

The Measurements Gates menu lets you use the oscilloscope vertical cursors to select portions of the signal on which to take measurements. Only the signal data between the cursors is evaluated.

Measurements Gates Options

Option Description

None button * Cursors button Turns on measurement gating * Selecting None means that the oscilloscope evaluates the entire signal instead of the section between the cursors. None is the default setting.

Turns off measurement gating

See Also

Using Cursors to Measure Part of a Waveform on page 38

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The Measurements Select Menu

The Measurements Select menu lets you select which measurements to take on the optical signal. You can take up to six measurements at the same time.

To select a measurement, click the button below the measurement label. You can select any combination of measurements, in any order.

Use the Clear button to deselect all selected measurements.

To configure selected measurement parameters, use the Measurement Configuration menu.

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The Measurements Configuration Menu

You use the Measurements Configuration menu to configure measurement parameters for measurements selected in the Measurement Select menu.

To configure a selected measurement, select the button corresponding to a selected Measurement, and adjust the parameter values. Note that you cannot set different parameter values for each measurement. For example, you cannot set the Adj Pos value to Leading for one measurement and then set it to Trailing for a different measurement. All measurements will use the last values entered in the parameter fields.

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Measurement Configuration Options

Option Description

Selected Measurements buttons Subject nT From n= To n= Adjacent nT From n= To n=

Adj Pos Sets the application to report results for

For Asym, Sym and Ratio Divisor nT

Data Edge Set the data signal edge for

Clock Edge Set the clock signal edge for

Data Polarity Set the data signal polarity type for

Note: All measurements use the same set of parameters: you cannot set different parameter values for each measurement. For example, you cannot set the Adj Pos value to Leading for one measurement and then set it to Trailing for a different measurement

Select a button to configure the associated measurement Sets the range of subject nT pulses to measure

Sets the application to report results for only those subject nT that have adjacent nT pulse widths within the specified range

only those subject nT that have adjacent nT pulses in the specified position. The adjacent position can be Leading, Trailing, Leading AND Trailing, or Leading OR Trailing Sets the nT pulse value to use in the denominator of symmetry, asymmetry, modulation amplitude ratio, and modulation amplitude resolution measurements

measurements. Values are All,Rising, and Falling

measurements. Values are All/Near, Rising, and Falling

measurements. Values are Positive, Negative, and Both

See Also

Measurement Configure Parameters on page 89

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The Measurements Plug-In Menu

The Plug-in menu lets you replace the built-in (default) Equalizer, Low Pass Filter, Slicer, and Phase-Locked Loop signal processes with your own custom .dll or MATLAB-based .m files.

Plug-In Options

Option Description

Built-In Default Tektronix signal processing

implementation

MATLAB™ User-created MATLAB .m file

DLL User-created .dll file

See Also

Using the Plug-In Feature on page 46 DLL Plug-in Usage Conventions on page 74

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MATLAB Plug-in Usage Conventions

Observe the following conventions when creating and using MATLAB .m plugin files:

• To use MATLAB .m file plug-in processes, install MATLAB version 6.1 (or later) on the oscilloscope, or optionally on a PC if you are running the application on a PC, prior to using the plug-in with the application,

• To use MATLAB .m file plug-in processes, add the path to the matlab.exe file to the oscilloscope operating system path.

• The application comes with example .m files, one for each signal process block. These files are located at C:\TekApplications\tdsdvd\Example Programs\MATLAB. The file names are tekEqualizer.m, tekLPF.m, tekSlicer.m, and tekPLL.m.

• User-created MATLAB files must adhere to the interface requirements defined for each signal process type. You can view the example .m files to see the content and organization for each signal process type.

• You should copy the existing .m files, rename them, and then edit the copies to create new .M files with your process definitions.

• You should make a backup copy of the example .m files and place them in a different directory for safekeeping.

DLL Plug-in Usage Conventions

Observe the following conventions when creating and using .dll plug-in files:

• User-created .dll files must use the following file names for each signal process block type:

Signal processor block .DLL file name

Equalizer CustomEqualizerLibrary.dll Low Pass Filter (LPF) CustomLPFLibrary.dll Slicer CustomSlicerLibrary.dll Phase-Locked Loop (PLL) CustomPllLibrary.dll

• Place user-created .dll files in the C:\Program files\TekApplications\tdsdvd directory prior to starting the application. If

you are running the application on a PC, you must place the .dll files in the same directory on both the PC and the oscilloscope.

• User-created .dll files must adhere to the interface requirements defined for each signal process type.

See Also

MATLAB Plug-in Usage Conventions on page 74

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The View Menu

The View menu provides the following functions:

• Results displays measurement results. The View Results Summary Tab shows a table containing a summary of Mean, Min, Max, Standard Deviation, and Population values for each measurement. There are also tabs for displaying the results of each individual measurement.

• Waveforms opens a menu containing buttons for displaying selected waveforms at specific stages in the signal processing chain. Select one or more of the buttons to display the waveform data in the Plot window. Buttons available are HF, Clock, LPF, EQ, Levl’d, and Sliced. These buttons correspond to the signal processing stages as shown in the Measurements > Inputs Block Diagram window.

There are two areas of the View menu, the Results Summary menu and the Results Measurement menu.

See Also

The View Results Measurement Menu on page 76 The View Waveforms Menu on page 81 The Log Menu on page 82

The View Results Summary Menu

The Results Summary menu displays a table listing a summary of the measurement results, with each row listing the Mean, Min, Max, Standard Deviation, Units, and Population for a measurement.

Selecting any of the measurement tabs in this menu displays the View Results Measurement Menu, which displays statistical results for each subject/adjacent nT for the selected measurement.

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The View Results Measurement Menu

The View Results Measurement menu displays statistical results for the selected subject/adjacent nT.

The Details column lets you display a specific subject/adjacent nT measurement as a linear graph, a histogram, or as a list of values. Selecting a button under the Details column displays the Measurement Details menu.

The Measurement Details Menu

The Measurement Details menu displays measurement values either graphically or as a list of values. To activate the Measurement Details menu, select the button in the Details column of the Results menu adjacent to the measurement for which you want more detail. The default display is a linear plot of the selected measurement, as shown.

The available measurement display formats are Plot, Hist (histogram), and List Other functions within this frame let you save measurements to a file, set the histogram bin value, autofit or format the plot X and Y values, and print the measurement information.

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You can resize the menu by selecting an edge or corner and dragging it to a new position. You can also use the mouse or touch screen to select a region of the plot and zoom in on that region.

Measurement Details Menu Options

This table describes the functions of the Measurement Details menu buttons and icons.

Option Description

Plot button Analyzes the variations of measured

parameter values along time (or measurements) and displays the results as a linear plot

Hist button Analyzes the statistical distribution (or

density) of measurements and displays the results as a bar graph of accumulated hits (or cycles) vs. the measurement value

Ctrl button Sets the histogram bin resolution value.

This button is only available when displaying a histogram

List button Displays the data points from which the

statistics were derived as a list of numerical values

Save button Displays the Save window which lets you

write the measurement list values to a specified file name and directory. This button is only available when listing measurements

Control icons Located in the upper right of the

Measurement Details Frame Prints the displayed plot or histogram to the oscilloscope default printer

Print icon

Resets X and Y axis ranges to their original values

Reset icon

Displays the Set Plot Format menu to set the plot parameters such as X and Y axis

Format icon

range and plot labels Rescales the plot to fit the data

Rescale icon

See Also

Histogram Display Example on page 78 List Display Example on page 79 Set Plot Format Menu on page 80

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Plot Display Example

This is an example of a Data Pulse Width measurement graph plot.

See Also

List Display Example on page 79

Histogram Display Example

This is an example of a Data Pulse Width measurement histogram plot.

See Also

Histogram Ctrl button on page 79 Plot Display Example on page 78 List Display Example on page 79

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Histogram Ctrl button

The Histogram Ctrl button displays a menu that lets you set the histogram bin resolution value. The bin values range from 5 to 500 in pre-defined increments.

List Display Example

This is an example of a measurement listing. You can use the Save button to save the results list to a file.

See Also

List Save Button on page 80 Plot Display Example on page 78 Histogram Display Example on page 78

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List Save button

The Measurement Details Save button displays a standard Windows dialog box that lets you save the measurement list values to a file in .csv format. Enter the file name and select the folder where you want to store the file.

Set Plot Format Menu

The Set Plot Format menu lets you change or add plot parameters such as the plot title, X and Y axis labels and data range, and plot tick marks.

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Set Plot Format Options

Item Description

Title Sets the plot title text displayed above the plot X Label, Y Label X Range, Y Range

Marks: Sets how the data points are drawn X Ticks, Y Ticks Grid Enables or disables displaying a grid on the plot Stems Draws a vertical line to each data point Connect Connects each data point with a line Use Color: Enables or disables using colors on the plot

Sets the X and Y-axis label text

Sets and displays the range of the displayed plot for the X-axis and Y-axis. The first value is the lower end of the range, followed by a comma, a space, and then the second value, which is the upper end of the range. You can use these fields to magnify areas of the plot by specifying a range of values that is less than the default axis range

Specifies the number of tick marks to display on the X-axis and Y-axis

You can resize the Measurement Details menu by selecting an edge or corner and dragging it to a new position. You can also use the mouse or touch screen to select a region of the plot and zoom in on that region.

The View Waveforms Menu

The View Waveforms menu lets you display waveform data at various stages of the signal processing path, in plot, histogram, or list format. You can select from one to six waveforms to plot at one time. Selecting a button opens the Measurement Details frame and displays the selected waveform as a linear plot. Each plot is shown in a different color.

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View Waveforms Options

Option/button Description

HF The high frequency (HF) waveform Clock The clock waveform at the Clock Meas point

selected in the Inputs Block Diagram (IBD)

LPF The waveform at the output of the Low Pass

Filter signal process block

EQ The waveform at the output of the Equalizer

signal process block

Levl’d The leveled waveform data (the input to the

Slicer comparator block)

Sliced The waveform at the output of the Slicer

signal process block

Note.

You can only view waveforms from active process blocks. For example, if you select Filtered as an input signal type and as a measurement output type, the Equalizer and Low Pass Filter waveforms cannot be viewed, as those process blocks are not active.

See Also

The Measurement Details Menu on page 76

The Log Menu

The Log menu lets you save measurement values for either a single measurement acquisition or a number of acquisitions into a .csv file. You can log up to six measurements at a time, but you must select and enable each measurement for logging. Each measurement is saved to a unique file name.

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Data Logging Options

Option/button Description

Selected Measurements Buttons

Logging On/Off Enables or disables logging. You must select

Log File Name Browse

Clear Deletes the on-disk file (.csv) of the selected

Save Current Saves the current selected measurement

Select measurement for logging

a measurement before using this button Displays an Open dialog box where you can specify a file name and directory path where you want to save the selected measurement log file

measurement. The path and file name are displayed in the Log file name field

results in the .csv file displayed in the Log File Name field. You do not need to have Logging On to save the current measurement

Note.

When the number of acquisitions in a log file reaches 10,000, that log file is renamed to <measurement_filename>old.csv, and a new log file named <measurement_filename>.csv is started.

See Also

Logging a Measurement to a File on page 43 Viewing a Data Log File on page 44 Data Log File Example on page 45 The Utilities Menu on page 84

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Open File Menu (Browse Button)

You use the Open File menu to specify a new file name and/or directory for saving a measurement log file.

The Utilities Menu

The Utilities menu provides the following functions:

• Track Error Count displays the number of tracking errors.

• AutoScroll displays a zoomed image of the waveform and scroll back

and forth through the waveform.

See Also

The Track Error Count Menu on page 85 The AutoScroll Menu on page 85

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The Track Error Count Menu

The Track Error Count menu displays the number of tracking errors in the data signal, or the number of tracking errors between two cursors if gating is on.

The AutoScroll Menu

The AutoScroll menu (Utilities > AutoScroll) provides dynamic control of the zoom feature of the oscilloscope and duplicates the zoom controls.

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AutoScroll Options

Option Description

Off Turns the instrument zoom window on or off Position Sets the horizontal position of the instrument zoom

window, as a percentage of the total record length

Step Size Sets the rate the instrument zoom window will

automatically scroll horizontally, as a percentage of the total record length

Scale Sets the horizontal magnification scale of the zoom

window

Direction Sets AutoScroll to scroll Forward (default) or

Reverse (back) through the zoom window

See Also

Using AutoScroll on page 42

The Help Menu

The Help menu provides the following functions:

• Contents and Index displays the TDSDVD online help window.

• About TDSDVD displays the application version information.

See Also

Using Online Help on page 7

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Parameters

Default Standards Parameters Table 1

The following table lists the first half of each standard’s default parameter settings. Refer to Default Standards Parameters, Table 2 on page 88 for the rest of the default standards parameters.

Parameter

Data Signal

Type HF-Data HF-Data HF-Data HF-Data HF-Data Source Ch1 Ch1 Ch1 Ch1 Ch1 Threshold 0.0 V 0.0 V 0.0 V 0.0 V 0.0 V Hysteresis 0.1 V 0.1 V 0.1 V 0.1 V 0.1 V

Clock Signal *

Source Ch2 Ch2 Ch2 Ch2 Ch2 Threshold 0.0 V 0.0 V 0.0 V 0.0 V 0.0 V Hysteresis 0.1 V 0.1 V 0.1 V 0.1 V 0.1 V

Ideal Clock **

Period 40 ns 40 ns 40 ns 40 ns 40 ns

Equalizer

b 1 1 1 1 1 c1 1.35 1.35 1.3 1.3 1.35 c2 -0.175 -0.175 -0.15 -0.16 -0.175 c3 -0.175 -0.175 -0.15 -0.16 -0.175 d1 2.093 2.093 2 2 2.093 d2 4.186 4.186 4 4 4.186 * Values only applied if measurement clock type is set to Clock Source ** Values only applied if measurement clock type is set to Synth Clock

DVDROM

DVD-R DVD-RAM DVD+RW Custom

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Default Standards Parameters Table 2

The following table lists the second half of each standard’s default parameter settings. Refer to Default Standards Parameters, Table 1 for the first half of the default standards parameters.

Parameter

Low Pass Filter

Bandwidth 8.2 MHz 8.2 MHz 10 MHz 15 MHz 8.2 MHz

Slicer

Bandwidth (-3dB closedloop) Init. Threshold

PLL

Bandwidth (open loop bandwidth) PLL Type DVD-

Measurement Configuration

Subject nT From n= 3 3 3 3 3 To n= 11 11 11 11 11 Adjacent nT From n= 3 3 3 3 3 To n= 11 11 11 11 11 Adj. Position Divisor nT 11 11 11 11 11 Data Edge All All All All All Clock Edge All/Near All/Near All/Near All/Near All/Near Data Polarity

DVDROM

5 kHz 5 kHz 10 kHz 5 kHz 5 kHz

0 V 0 V 0 V 0 V 0 V

9 kHz 9 kHz 4.7746 kHz 12 kHz 9 kHz

ROM

Leading Leading Leading Leading Leading

Both Both Both Both Both

DVD-R

DVD-R DVD-RAM DVD+RW DVD-

DVD-RAM DVD+RW Custom

ROM

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Measurement Configure Parameters

The following parameters are for the Measurements > Configure menu. Selecting a measurement button in this menu enables the appropriate parameter fields for that measurement.

Parameters

Subject nT From n = 1 to 25 in units of T 3 To n = 1 to 25 in units of T 11 Adjacent nT From nT = 1 to 25 in units of T 3 To nT = 1 to 25 in units of T 11 Adj Pos (Adjacent Position)

For Asym, Sym & Ratio Divisor

Data Edge (Data-to-Clock Edge Shift measurement only) Clock Edge Rising

Data Polarity Positive

Value range

Leading Trailing Leading AND Trailing Leading OR Trailing 1 to 25 in units of T 11

Rising Falling All

Falling All/Near

Negative Both

Default Settings

Leading

All

All/Near

Both

Input Signal Parameters

The following parameters are for the Measurements > Inputs menu. The fields depend on which input source button was last selected in the Inputs Block Diagram panel.

Parameters

Source Ch1-Ch4

Pit/Space Shortest Longest Threshold * Hysteresis *

Ideal Clock Period

* Autoset affects the these settings

Selections

Ref1-Ref4 Math1-Math4

0 to 24 in units of T 0 to 24 in units of T

-10 to 10 in Volts 0 0 to 1 in Volts 0

0 to 1 s in units of 1 ps 200 ps

Default Settings

Ch1

3 14

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Equalizer CoefficientParameters

The following parameters are for the Equalizer process block.

Parameters

b -10 to 10 The 3-tap analog equalizer boost

c1 -10 to 10 The coefficient for the first tap of the

c2 -10 to 10 The coefficient for the second tap of

c3 -10 to 10 The coefficient for the third tap of the

d1 0 to 10 The first delay coefficient for the 3-

d2 0 to 10 The second delay coefficient for the

Low Pass Filter Parameters

The following parameters are for the Low Pass Filter process block.

Parameter

Bandwidth 1 MHz to

Value Range

500 MHz

Description

value

3-tap analog equalizer

the 3-tap analog equalizer

3-tap analog equalizer

tap analog equalizer

3-tap analog equalizer

Description

The low pass filter corner frequency

Slicer Parameters

The following parameters are for the Slicer process block.

Parameter

Bandwidth 1 kHz to

Threshold -3 to 3, in Volts 0 V The low pass

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500 kHz

Default Setting Description

Depends on selected standard

The Slicer corner frequency

filter corner frequency

Reference

Phase-Locked Loop Parameters

The following parameters are for the Phase-Locked Loop process block.

Algorithms

About Measurements

Measurement Background

Measurement background provides information on signal terminology and characterization. Algorithm Equation Notation on page 96 describes the algorithms of the key application measurements.

This application assumes that the following conditions are met in order to obtain measurements:

Parameter

Bandwidth 1 kHz to

PLL Type DVD-ROM

Value Range

500 kHz

DVD-R DVD-RAM DVD-RW

Description

The Phase-Locked Loop first corner frequency The source data type

• The data source signal is a continuous physical data disk recording of nT pulses with no gaps or non-nT type data.

• The clock period (T) of the data source signal is constant.

See Also

Taking Measurements Guidelines on page 27

The Data Signal

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()(

The data signal waveform is first processed to identify the pits and spaces, the parts of the processed read-back waveform corresponding to the physical pits and spaces embossed on the media. Each waveform segment, delimited by threshold crossings, is a data pulse. The waveform segments are categorized as pits or spaces, depending on the polarity of the voltage corresponding to this data pulses (with respect to the threshold level).

Hysteresis

To prevent false reading of pits and spaces a hysteresis is used, as shown in the figure. To qualify as a valid pulse (pit or space) the voltage of the pulse must cross outside the hysteresis band to be recognized as a change to a second pulse (pit or space). Full crosses of the hysteresis band are necessary at each end of a pulse for that pulse to be identified as such.

Data Pulse Categorization

Each pulse is the data-to-measure waveform is categorized as an nT pulse, where n is an integer, T is the clock period (average clock period if the clock is extracted or measured), and the following relation is true for the pulse width:

)

TnwTn 5.05.0 +<≤−

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High and Low Amplitude

Where

V is the high amplitude (of the pit).

V is the low amplitude (of the space).

−

V and −V are referenced from zero volts.

k is an index that measures the number of pulses from the beginning of the analyzed waveform.

A pulse width W that satisfies the equation in Data Pulse Categorization is an nT pulse.

The individual pulse that is being measured algorithm is called the subject pulse. The neighboring pulses, the first to the left and to the right, are called adjacent pulses.

See Also

Peak-to-Peak and Decision Level on page 94 Data Pulse Categorization on page 92

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Peak-to-Peak and Decision Level

If two adjacent pulses have the same nT categorization then two additional parameters of the pulse pair are defined.

Where

is the peak-to-peak amplitude of the waveform

PkPkV−

V is the Decision Level, and is calculated by

+ V-)/2, where V is measured with reference to zero volts

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Data and Clock Time Parameters

The following are some basic data and clock waveform time parameters.

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Measurement Algorithms

Algorithm Equation Notation

The algorithms in this document use the following notation:

Notation Description

−

PkPk

−

The high amplitude of a nT pit.

The low amplitude of a nT space.

The peak-to-peak amplitude of a nT pulse pair.

The decision level of a nT pulse pair.

The average of the corresponding measurement for all the nT pulses or nT pulse pairs.

The pulse width of a nT pulse pit or space.

−

The average of the corresponding measurement for all the nT pulses.

The time difference between the leading edge of a data pulse and the following clock edge

The time difference between the trailing edge of a data pulse and the following clock edge

The time difference between the leading edge of a data pulse and the preceding clock edge.

The time difference between the trailing edge of a data pulse and the preceding clock edge.

High Amplitude

The High Amplitude measurement calculates the high amplitude,

, for each nT pit/pulse in the specified nT subject range.

Low Amplitude

The Low Amplitude measurement calculates the low amplitude,

, for each nT space/pulse in the specified nT subject range.

−

Decision Level Measurement

The Decision Level measurement calculates the decision level,

V , for each nT pit/space pulse pair in the specified nT subject

range.

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Peak-to-Peak Amplitude Measurement

The Peak-to-Peak Amplitude measurement calculates the peak-to-

peak,

, for each nT pit/space pulse pair in the specified nT

−

PkPk

subject range.

Modulation Amplitude Ratio

The Modulation Amplitude Ratio measurement calculates the ratio,

21 nn

PkPk

and for a specified divisor n

, for each n1T pit/space pulse pair in the subject range,

+−

Modulation Amplitude Resolution

The Modulation Amplitude Resolution measurement calculates the

ratio,

subject range and for a specified n

21 n

PkPk

, for each n1T pit/space pulse pair in the n1T

PkPk

−−

Symmetry Measurement

Symmetry calculates the ratio,

pit/space pulse pair in the subject range, and for a specified n

5.0

, for each n1T

PkPk

−

Asymmetry Measurement

Asymmetry calculates the ratio

)(

VVV−− , for each n

PkPk

212

pit/space pulse pair in the subject range and for a specified divisor

Clock Jitter Measurement

The Clock Jitter measurement calculates a vector of time skews between the real and the ideal clock signals.

The clock signal can be measured from the system under test (SUT), extracted from the data, or synthesized by the application. The Clock Jitter measurement yields zero jitter when using an ideal (synthesized) clock.

Data Pulse Width Measurement

The Data Pulse Width measurement calculates the width of the

data pulse,

w , for each nT pulse in the nT subject range.

TDSDVD Optical Storage Analysis Application

Reference

Timing Jitter Measurement

Timing Jitter calculates the difference between data pulse width

and the average data pulse width,

of an nT pulse in the subject range. The result is displayed normalized to the clock period (T) as a percentage based on the

formula

Active data edges occur when an edge traverses the data threshold point in the specified direction.

Tww

/)(*100 −

ww − , for each active edge

Data-to-Clock Edge Shift Measurement

The Data-to-Clock Edge Shift measurement calculates the time difference between active data edges and active clock edges,

and/or

pulse in the nT subject range. Select the edge type (clock or data) in the Measurements > Configuration menu.

and/or

−

and/or

, for each active edge of a nT

−

Mean

The Mean measurement calculates an unbiased estimate of the expected value of a finite set (n) of numerical data elements (grouped in a vector x). The measurement returns a scalar value.

∑

==1

)(µ

Where i is the i-th element of vector x.

Standard Deviation Measurement

The Standard Deviation measurement calculates an unbiased estimate of the standard deviation of a finite set (n) of numerical

data elements (grouped in a vector x), and returns a scalar The standard deviation is computed as the square root of the

variance, as defined in the following formula:

−

where i is the i-th element of the vector x.

∑

==1

)(

()()

)(xσ .

Equalizer

The Equalizer is a three-tap analogue equalizer specified by the three numerical values of the coefficients of its discrete transfer function, and two numerical

98 TDSDVD Optical Storage Analysis Application

Reference

values for the corresponding tap delays. It provides an equalized signal based on a sampled input signal.

Low Pass Filter

The Low Pass Filter (LPF) is a 6th-order Bessel filter specified by the corner frequency. It provides a low-pass filtered signal based on a sampled input signal.

Slicer

The Slicer is a feed-back auto-slicer, 1st order of integration, and is specified by the frequency of the –3 dB closed-loop bandwidth. The Slicer produces two waveforms available for display: the Leveled waveform and the Slicer output waveform.

Phase-Locked Loop Type

The Phase-Locked Loop (PLL) uses a PLL process to provide a recovered clock signal based on a NRZ data signal. The PLL openloop bandwidth (f

There are three types of PLL available in the application, with the following filter transfer function characteristics, which cover various ECMA standard PLL requirements.

TDSDVD Optical Storage Analysis Application

) is a user-adjustable parameter.

Reference

DVD-ROM and DVD-R

DVD-RAM

DVD-RW

100 TDSDVD Optical Storage Analysis Application

Tektronix TDSDVD User manual

Specifications and Main Features

Frequently Asked Questions

User Manual