N5394A DVI Application Compliance Testing Methods of ...

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N5394A DVI Application Compliance Testing Methods of ...

  1. 1. Agilent N5394A DVI Electrical Performance Validation and Compliance Software Compliance Testing Methods of Implementation Agilent Technologies
  2. 2. Notices © Agilent Technologies, Inc. 2004 Manual Part Number agency regulation or contract clause. Use, duplication or disclosure of Software is No part of this manual may be reproduced N5394-97001 subject to Agilent Technologies’ standard in any form or by any means (including commercial license terms, and non-DOD electronic storage and retrieval or transla- tion into a foreign language) without prior Edition Departments and Agencies of the U.S. Gov- ernment will receive no greater than agreement and written consent from Agi- Second edition, October 2004 Restricted Rights as defined in FAR lent Technologies, Inc. as governed by Printed in USA 52.227-19(c)(1-2) (June 1987). U.S. Govern- United States and international copyright ment users will receive no greater than laws. Agilent Technologies, Inc. Limited Rights as defined in FAR 52.227-14 1900 Garden of the Gods Road (June 1987) or DFAR 252.227-7015 (b)(2) Colorado Springs, CO 80907 USA (November 1995), as applicable in any technical data. Warranty The material contained in this docu- Safety Notices ment is provided “as is,” and is sub- ject to being changed, without notice, in future editions. Further, to the max- CAUTION imum extent permitted by applicable A CAUTION notice denotes a haz- law, Agilent disclaims all warran- ties, either express or implied, with ard. It calls attention to an operat- regard to this manual and any infor- ing procedure, practice, or the like mation contained herein, including that, if not correctly performed or but not limited to the implied warran- adhered to, could result in damage ties of merchantability and fitness for to the product or loss of important a particular purpose. Agilent shall not data. Do not proceed beyond a be liable for errors or for incidental or consequential damages in connection CAUTION notice until the indicated with the furnishing, use, or perfor- conditions are fully understood and mance of this document or of any met. information contained herein. Should Agilent and the user have a separate written agreement with warranty terms covering the material in this WA R N I N G document that conflict with these terms, the warranty terms in the sep- A WARNING notice denotes a arate agreement shall control. hazard. It calls attention to an operating procedure, practice, or Technology Licenses the like that, if not correctly per- formed or adhered to, could result The hardware and/or software described in this document are furnished under a in personal injury or death. Do not license and may be used or copied only in proceed beyond a WARNING accordance with the terms of such license. notice until the indicated condi- tions are fully understood and met. Restricted Rights Legend If software is for use in the performance of a U.S. Government prime contract or sub- contract, Software is delivered and licensed as “Commercial computer soft- ware” as defined in DFAR 252.227-7014 (June 1995), or as a “commercial item” as defined in FAR 2.101(a) or as “Restricted computer software” as defined in FAR 52.227-19 (June 1987) or any equivalent
  3. 3. DVI Automated Testing—At A Glance The Agilent N5394A DVI Electrical Performance Validation and Compliance Software helps you verify DVI transmitter device under test (DUT) compliance to specifications with the Agilent 54854A/54855A Infiniium 20GS/s digital storage oscilloscope. The DVI Electrical Performance Validation and Compliance Software: • Lets you select individual or multiple tests to run. • Lets you identify the device being tested and its configuration. • Shows you how to make oscilloscope connections to the device under test. • Automatically checks for proper oscilloscope configuration. • Automatically sets up the oscilloscope for each test. • Provides detailed information for each test that has been run and lets you specify the thresholds at which marginal or critical warnings appear. • Creates a printable HTML report of the tests that have been run. The tests performed by the DVI Electrical Performance Validation and Compliance Software NOTE are intended to provide a quick check of the electrical health of the DUT. This testing is not a replacement for an exhaustive test validation plan. Compliance testing measurements are described in Section 4.7, Electrical Measurement Procedures, in the DVI Specification Revision 1.0. For more information, see the DDWG (Digital Display Working Group) web site at www.ddwg.org. Required Equipment and Software In order to run the DVI automated tests, you need the following equipment and software: • 54854A/54855A Infiniium 4/6 GHz, 20GS/s Digital Storage Oscilloscope. Option 001 (1M/ch memory upgrade) is recommended; this will greatly reduce Data Eye Pattern and Jitter test times. • N5394A DVI Electrical Performance Validation and Compliance Software. • Probes and/or test fixtures. For more information on the specific probes and test fixtures required, refer to the chapters that describe tests. • Keyboard, qty = 1, (provided with the Agilent 54854A/54855A oscilloscope). • Mouse, qty = 1, (provided with the Agilent 54854A/54855A oscilloscope). • Precision 3.5 mm BNC to SMA male adapter, Agilent p/n 54855-67604, qty = 2 (provided with the Agilent 54854A/54855A oscilloscope). • 50-ohm Coax Cable with SMA Male Connectors – 24-inch or less RG-316/U or similar, qty = 2, matched length. DVI Compliance Testing Methods of Implementation 3
  4. 4. In This Book This manual describes the tests that are performed by the DVI Electrical Performance Validation and Compliance Software in more detail; it contains information from (and refers to) the DVI Specification Revision 1.0, and it describes how the tests are performed. • Chapter 1, “Installing the DVI Electrical Performance Validation and Compliance Software” shows how to install and license the automated test application software (if it was purchased separately). • Chapter 2, “Preparing to Take Measurements” shows how to start the DVI Electrical Performance Validation and Compliance Software and gives a brief overview of how it is used. • Chapter 3, “Transmitter Data Eye Pattern Tests” contains more information on the data eye pattern tests. • Chapter 4, “Transmitter Jitter Tests” contains more information on the clock jitter test. • Chapter 5, “Transmitter Transition Time Tests” contains more information on the risetime/falltime tests. • Chapter 6, “Transmitter Inter-Pair Skew Tests” contains more information on the inter-pair skew tests. • Chapter 7, “Cable Assembly Tests” contains more information on testing cable assemblies. • Appendix A, “Calibrating the 54854A/54855A Digital Storage Oscilloscope” describes how to calibrate the oscilloscope in preparation for running the DVI automated tests. • Appendix B, “INF_SMA_Deskew.set Setup File Details” describes a setup used when performing channel de-skew calibration. • Appendix C, “InfiniiMax Probing” describes the 1132A/1134A probe amplifier and probe head recommendations for DVI testing. See Also • The DVI Electrical Performance Validation and Compliance Software’s online help, which describes: • Creating or opening a test project. • Selecting tests. • Configuring selected tests. • Connecting the oscilloscope to the DUT. • Running tests. • Viewing test results. • Viewing/printing the HTML test report. • Saving test projects. 4 DVI Compliance Testing Methods of Implementation
  5. 5. Contents DVI Automated Testing—At A Glance 3 Required Equipment and Software 3 In This Book 4 See Also 4 1 Installing the DVI Electrical Performance Validation and Compliance Software Installing the Software 7 Installing the License Key 7 2 Preparing to Take Measurements Acquiring Test Fixtures 10 Soldering Damping Resistors into Test Fixtures 13 Calibrating the Oscilloscope 14 Starting the DVI Electrical Performance Validation and Compliance Software 15 Online Help Topics 16 3 Transmitter Data Eye Pattern Tests Probing for Data Eye Pattern Tests 18 D0/D1/D2 - Eye Pattern Test Method of Implementation 20 Test Definition Notes from the Specification 20 Test Procedure 20 PASS Condition 22 Measurement Algorithm 22 Test References 22 4 Transmitter Jitter Tests Probing for Jitter Tests 24 Clock - Jitter Test Method of Implementation 26 Test Definition Notes from the Specification 26 Test Procedure 26 PASS Condition 27 Measurement Algorithm 27 Test References 27 DVI Compliance Testing Methods of Implementation 5
  6. 6. 5 Transmitter Transition Time Tests Probing for Transition Time Tests 30 Transition Time Test Method of Implementation 32 Test Definition Notes from the Specification 32 Test Procedure 32 PASS Condition 33 Measurement Algorithm 33 Test References 33 6 Transmitter Inter-Pair Skew Tests Probing for InterPairSkew Tests 36 D0/D1, D0/D2, D1/D2 - Skew Test Method of Implementation 38 Test Definition Notes from the Specification 38 Test Procedure 38 PASS Condition 39 Measurement Algorithm 39 Test References 39 7 Cable Assembly Tests Probing for Cable Assembly Eye Pattern Tests 42 D0/D1/D2 - Eye Pattern Test Method of Implementation 44 Test Definition Notes from the Specification 44 Test Procedure 44 PASS Condition 45 Measurement Algorithm 46 Test References 46 A Calibrating the 54854A/54855A Digital Storage Oscilloscope Required Equipment for Calibration 47 Internal Calibration 48 Cable and Probe Calibration 54 Channel-to-Channel De-skew 63 B INF_SMA_Deskew.set Setup File Details C InfiniiMax Probing Index 6 DVI Compliance Testing Methods of Implementation
  7. 7. N5394A DVI Electrical Performance Validation and Compliance Software Compliance Testing Methods of Implementation 1 Installing the DVI Electrical Performance Validation and Compliance Software Installing the Software 7 Installing the License Key 7 If you purchased the N5394A DVI Electrical Performance Validation and Compliance Software separately, you need to install the software and license key. Installing the Software 1 Make sure you have version A.03.50 or higher of the Infiniium oscilloscope software by choosing Help>About Infiniium... from the main menu. 2 Insert the DVI Electrical Performance Validation and Compliance Software CD, and follow the instructions. Be sure to accept the installation of the .NET Framework software; it is required in order to run the DVI Electrical Performance Validation and Compliance Software. Installing the License Key 1 Request a license code from Agilent by following the instructions on the Entitlement Certificate. You will need the oscillocope’s “Option ID Number”, which you can find in the Help>About Infiniium... dialog. 2 After you receive your license code from Agilent, choose Utilities>Install Option License.... 3 In the Install Option License dialog, enter your license code and click Install License. 4 Click OK in the dialog that tells you to restart the Infiniium oscilloscope application software to complete the license installation. Agilent Technologies 7
  8. 8. 1 Installing the DVI Electrical Performance Validation and Compliance Software 5 Click Close to close the Install Option License dialog. 6 Choose File>Exit. 7 Restart the Infiniium oscilloscope application software to complete the license installation. 8 DVI Compliance Testing Methods of Implementation
  9. 9. N5394A DVI Electrical Performance Validation and Compliance Software Compliance Testing Methods of Implementation 2 Preparing to Take Measurements Acquiring Test Fixtures 10 Calibrating the Oscilloscope 14 Starting the DVI Electrical Performance Validation and Compliance Software 15 Before running the DVI automated tests, you need to acquire the appropriate test fixtures, and you should calibrate the oscilloscope. After the oscilloscope has been calibrated, you are ready to start the DVI Electrical Performance Validation and Compliance Software and perform measurements. Agilent Technologies 9
  10. 10. 2 Preparing to Take Measurements Acquiring Test Fixtures DVI test fixtures can be acquired from a distributor of Silicon Image parts or from the DDWG (Digital Display Working Group) (see the web site at www.ddwg.org). Currently available test fixtures, called “TPA2” fixtures in this document, include a CRU (Clock Recovery Unit) board and TPA2-P (plug) and TPA2-R (receptacle) adapter boards. Figure 1 TPA2-P (Plug) Adapter Board Figure 2 TPA2-R (Receptacle) Adapter Board (Top and Bottom Views) 10 DVI Compliance Testing Methods of Implementation
  11. 11. Preparing to Take Measurements 2 Figure 3 CRU (Clock Recovery Unit) Board (for TPA2 Fixtures) The CRU board must be configured according to the clock frequency in use. NOTE DVI Compliance Testing Methods of Implementation 11
  12. 12. 2 Preparing to Take Measurements Earlier DVI plug and receptacle test fixtures from Silicon Image, called “TPA” fixtures in this document, had the CRU (Clock Recovery Unit) built-in. Figure 4 TPA-P (Plug) Test Point Access Board Figure 5 TPA-R (Receptacle) Test Point Access Board 12 DVI Compliance Testing Methods of Implementation
  13. 13. Preparing to Take Measurements 2 Soldering Damping Resistors into Test Fixtures To get the best probed signal fidelity, the E2678A differential socket probe head for the 1132A/1134A InfiniiMax probe amplifier is recommended. This probing solution requires damping resistors to be soldered into test fixture boards at the data channel and raw clock test points. The proper damping resistors (and instructions for soldering them into a device under test) are included with the E2678A differential socket probe head. Figure 6 Damping Resistors Soldered into TPA2-P and CRU Boards DVI Compliance Testing Methods of Implementation 13
  14. 14. 2 Preparing to Take Measurements Calibrating the Oscilloscope If you haven’t already calibrated the oscilloscope, see Appendix A, “Calibrating the 54854A/54855A Digital Storage Oscilloscope”. If the ambient temperature changes more than 5 degrees Celsius from the calibration NOTE temperature, internal calibration should be performed again. The delta between the calibration temperature and the present operating temperature is shown in the Utilities>Calibration menu. If you switch cables between channels or other oscilloscopes, it is necessary to perform NOTE cable and probe calibration again. Agilent recommends that, once calibration is performed, you label the cables with the channel they were calibrated for. 14 DVI Compliance Testing Methods of Implementation
  15. 15. Preparing to Take Measurements 2 Starting the DVI Electrical Performance Validation and Compliance Software 1 From the Infiniium oscilloscope’s main menu, choose Analyze>Automated Test Apps>DVI. Figure 7 The DVI Electrical Performance Validation and Compliance Software If DVI does not appear in the Automated Test Apps menu, the DVI Electrical Performance NOTE Validation and Compliance Software has not been installed (see Chapter 1, “Installing the DVI Electrical Performance Validation and Compliance Software”). Figure 7 shows the DVI Electrical Performance Validation and Compliance Software main window. The task flow pane, and the tabs in the main pane, show the steps you take in running the automated tests: DVI Compliance Testing Methods of Implementation 15
  16. 16. 2 Preparing to Take Measurements Select Tests Lets you select the tests you want to run. The tests are organized hierarchically so you can select all tests in a group. After tests are run, status indicators show which tests have passed, failed, or not been run, and there are indicators for the test groups. Configure Lets you enter information about the device being tested and configure test parameters (like memory depth). This information appears in the HTML report. Connect Shows you how to connect the oscilloscope to the device under test for the tests to be run. Run Tests Starts the automated tests. If the connections to the device under test need to be changed while multiple tests are running, the tests pause, show you how to change the connection, and wait for you to confirm that the connections have been changed before continuing. Results Contains more detailed information about the tests that have been run. You can change the thresholds at which marginal or critical warnings appear. HTML Report Shows a compliance test report that can be printed. You can choose between a verbose and compact report. Online Help Topics For information on using the DVI Electrical Performance Validation and Compliance Software, see its online help (which you can access by choosing Help>Contents... from the application’s main menu). The DVI Electrical Performance Validation and Compliance Software’s online help describes: • Creating or opening a test project. • Selecting tests. • Configuring selected tests. • Connecting the oscilloscope to the DUT. • Running tests. • Viewing test results. • To show reference images and flash mask hits. • To change margin thresholds. • Viewing/printing the HTML test report. • Saving test projects. 16 DVI Compliance Testing Methods of Implementation
  17. 17. N5394A DVI Electrical Performance Validation and Compliance Software Compliance Testing Methods of Implementation 3 Transmitter Data Eye Pattern Tests Probing for Data Eye Pattern Tests 18 D0/D1/D2 - Eye Pattern Test Method of Implementation 20 This section provides the Methods of Implementation (MOIs) for data eye pattern tests using an Agilent 54854A/54855A Infiniium oscilloscope, 1132A/1134A probes, and the DVI Electrical Performance Validation and Compliance Software. Agilent 54854A/54855A Option 001 (1M/ch memory upgrade) is recommended; this will NOTE greatly reduce Data Eye Pattern test times. Agilent Technologies 17
  18. 18. 3 Transmitter Data Eye Pattern Tests Probing for Data Eye Pattern Tests When performing data eye pattern tests, the DVI Electrical Performance Validation and Compliance Software will prompt you to make the proper connections (also shown in Figure 8 or Figure 9). TPA2-P Adapter Board CRU Board Raw Clock DVI Connector DVI + + Source - - Recovered (DUT) SMA to SMA Clock D0/D1/D2 Cables Test Point + - SMA to BNC Cable Damping Resistors 54854A/54855A Oscilloscope E2678A Differential Socket Probe Head Ch2 Ch3 Ch4 1132A/1134A Probe Amplifier Figure 8 Probing for Data Eye Pattern Tests (TPA2 Fixture) TPA-P Test Access Board DVI Connector DVI D0/D1/D2 Source E2678A Differential 1132A/1134A Test Point Socket Probe Head Probe Amplifier (DUT) + - Damping Resistors Recovered Clock 54854A/54855A Oscilloscope SMA to BNC Cable Ch2 Ch3 Ch4 Figure 9 Probing for Data Eye Pattern Tests (TPA Fixture) 18 DVI Compliance Testing Methods of Implementation
  19. 19. Transmitter Data Eye Pattern Tests 3 You can use any of the oscilloscope channels for the recovered clock and data test point. You identify the channels used for each signal in the Configuration tab of the DVI Electrical Performance Validation and Compliance Software. (The channels shown in Figure 8 and Figure 9 are just for example.) For more information on the 1132A/1134A probe amplifiers and differential probe heads, see Appendix C, “InfiniiMax Probing,” starting on page 71. DVI Compliance Testing Methods of Implementation 19
  20. 20. 3 Transmitter Data Eye Pattern Tests D0/D1/D2 - Eye Pattern Test Method of Implementation Data eye pattern measurements are made as a differential measurements using the recovered clock signal as the oscilloscope trigger source. The transmitter drives the pseudo-random data test pattern and the test ensures that the eye diagram limits given by the DVI spec are not exceeded. Test Definition Notes from the Specification See section 4.7.6, Transmitter Eye, in the DVI Specification Revision 1.0. Test Procedure 1 Attach a DVI monitor to the DVI source (DUT). 2 Select a resolution for test, and display the pseudo random pattern in full screen mode. 3 Unplug the monitor, and connect the TPA2 plug adapter board directly to the output of the DVI source. 4 Confirm the frequency output of the DVI source by measuring RC+ and RC- on the TPA2 plug board with the oscilloscope. 5 Set the CRU board to operate at the correct frequency. 6 Allow the CRU board to warm up for 5 minutes. 7 Attach the SMA to SMA cables from RC+ and RC- on the TPA2 plug board to the respective SMA connectors on the CRU board. 8 Start the automated testing application as described in “Starting the DVI Electrical Performance Validation and Compliance Software" on page 15. 9 In the DVI Test application, click the Select Tests tab. 10 Navigate to the Data Eye Pattern group, and check the appropriate Eye Pattern test (D0, D1, or D2). 20 DVI Compliance Testing Methods of Implementation
  21. 21. Transmitter Data Eye Pattern Tests 3 Figure 10 Selecting Data Eye Pattern Tests 11 Follow the DVI Test application’s task flow to set up configuration options, make oscilloscope connections, run the test, and view the test results. Table 1 Data Eye Pattern Test Configuration Options Configuration Option Description Device Description Lets you enter information about the device under test, including the device ID and any comments that you wish to include. Test Fixture Identifies the revision of your test fixture. Agilent recommends test fixture TPA2. The recovered clock from TPA will have 2.5 times the frequency of the raw clock. TPA2 however will have the same frequency for both clocks. Recovered Clock Identifies the oscilloscope channel probing the recovered clock. D0/D1/D2 Identifies the oscilloscope channels probing data channel links D0, D1, and D2. Test Freq Identifies the frequency of the DVI interface you are testing. You can [Screen Resolution] select one of the frequencies from the drop-down list, or you can enter a frequency in the range from 25 to 165 MHz. Mask Type Choose “Normalized Eye Pattern Mask at TP2”. # Unit Interval Available in Debug Mode, this option specifies the number of UI (Unit Intervals) to measure in the data eye pattern test. The DVI revision 1.0 specification recommends 100,000 acquisitions to achieve 99% confidence within 1% error of the mean value. For full compliance, a measurement of 1,000,000 acquisitions must be made. Note that increasing the number of UI has a negative impact on the run time of the data eye pattern tests. Value used in Compliance Mode: 100,000. DVI Compliance Testing Methods of Implementation 21
  22. 22. 3 Transmitter Data Eye Pattern Tests Table 1 Data Eye Pattern Test Configuration Options (continued) Configuration Option Description Manual Mask Specifies whether the manual mask adjustment is needed prior to the Adjustment mask test. Composite Eye Available in Debug Mode, this option specifies whether all data bits in a pixel need to be overlapped in the eye diagram. Value used in Compliance Mode: Off. Worst Eye Location Available in Debug Mode, this option specifies the location of the worst eye in respect to the rising edge of the recovered clock. This parameter will be ignored if Composite Eye is turned ON. Choose auto to let the application automatically find the worst eye. The worst eye is defined as the bit having the smallest pulse width. Select only 1-4 for the TPA test fixture. Value used in Compliance Mode: Auto. PASS Condition Zero mask failures. Measurement Algorithm 1 Trigger on the recovered clock; the data lane is being viewed in color grade form. 2 Repeat step 1 until the # Unit Intervals has been reached. 3 The test passes if none of the waveform sample points falls into the mask failure region. Test References Section 4.3, Transmitter Electrical Specifications, in the DVI Specification Revision 1.0. 22 DVI Compliance Testing Methods of Implementation
  23. 23. N5394A DVI Electrical Performance Validation and Compliance Software Compliance Testing Methods of Implementation 4 Transmitter Jitter Tests Probing for Jitter Tests 24 Clock - Jitter Test Method of Implementation 26 This section provides the Methods of Implementation (MOIs) for jitter tests using an Agilent 54854A/54855A Infiniium oscilloscope, probes, and the DVI Electrical Performance Validation and Compliance Software. Agilent 54854A/54855A Option 001 (1M/ch memory upgrade) is recommended; this will NOTE greatly reduce Jitter test times. Agilent Technologies 23
  24. 24. 4 Transmitter Jitter Tests Probing for Jitter Tests When performing the clock jitter test, the DVI Electrical Performance Validation and Compliance Software will prompt you to make the proper connections (also shown in Figure 11 or Figure 12). TPA2-P Adapter Board CRU Board Damping Resistors E2678A Differential Raw Clock Test Point Socket Probe Head DVI Connector DVI + + + Source - - - (DUT) SMA to SMA 1132A/1134A Cables Probe Amplifier Recovered Clock 54854A/54855A Oscilloscope SMA to BNC Cable Ch2 Ch3 Ch4 Figure 11 Probing for Jitter Tests (TPA2 Fixture) TPA-P Test Access Board Recovered Clock SMA to BNC DVI Connector DVI Cable Source (DUT) Raw Clock Test Point - + Damping Resistors 54854A/54855A Oscilloscope E2678A Differential Socket Probe Head Ch2 Ch3 Ch4 1132A/1134A Probe Amplifier Figure 12 Probing for Jitter Tests (TPA Fixture) 24 DVI Compliance Testing Methods of Implementation
  25. 25. Transmitter Jitter Tests 4 You can use any of the oscilloscope channels for the recovered clock and raw clock test point. You identify the channels used for each signal in the Configuration tab of the DVI Electrical Performance Validation and Compliance Software. (The channels shown in Figure 11 and Figure 12 are just for example.) DVI Compliance Testing Methods of Implementation 25
  26. 26. 4 Transmitter Jitter Tests Clock - Jitter Test Method of Implementation The jitter measurement in the raw clock is performed as a differential measurement of the rising edge of the clock signal (clk+ minus clk-). The clock signal from the clock recovery unit must be used as a trigger source. Test Definition Notes from the Specification See section 4.7.7, Jitter Measurement, in the DVI Specification Revision 1.0. Test Procedure 1 Start the automated testing application as described in “Starting the DVI Electrical Performance Validation and Compliance Software" on page 15. 2 In the DVI Test application, click the Select Tests tab. 3 Navigate to the Jitter group, and check the “Clock - Jitter” test. Figure 13 Selecting Jitter Tests 4 Follow the DVI Test application’s task flow to set up configuration options, make oscilloscope connections, run the test, and view the test results. Table 2 Clock Jitter Test Configuration Options Configuration Option Description Device Description Lets you enter information about the device under test, including the device ID and any comments that you wish to include. Test Fixture Identifies the revision of your test fixture. Agilent recommends test fixture TPA2. Recovered Clock Identifies the oscilloscope channel probing the recovered clock. 26 DVI Compliance Testing Methods of Implementation
  27. 27. Transmitter Jitter Tests 4 Table 2 Clock Jitter Test Configuration Options (continued) Configuration Option Description Raw Clock Identifies the oscilloscope channel probing the raw clock. Test Freq Identifies the frequency of the DVI interface you are testing. You can [Screen Resolution] select one of the frequencies from the drop-down list, or you can enter a frequency in the range from 25 to 165 MHz. Number of edges (Jitter) Specifies the number of differential clock signal acquisitions to use when performing the jitter measurement. PASS Condition ≤ 0.25 Tbit The bit time Tbit is one tenth of the pixel time. The bit time is also referred to as one Unit Interval, or UI, in the jitter and eye diagram specification. Measurement Algorithm 1 Trigger on the recovered clock; the raw clock signal is being viewed in color grade form. 2 Repeat step 1 until "Number of edges" has been acquired. 3 Jitter is the width the of signal at 50% crossing. (Measure using histogram.) Test References Section 4.6, Jitter Specifications, in the DVI Specification Revision 1.0. DVI Compliance Testing Methods of Implementation 27
  28. 28. 4 Transmitter Jitter Tests 28 DVI Compliance Testing Methods of Implementation
  29. 29. N5394A DVI Electrical Performance Validation and Compliance Software Compliance Testing Methods of Implementation 5 Transmitter Transition Time Tests Probing for Transition Time Tests 30 Transition Time Test Method of Implementation 32 Agilent Technologies 29
  30. 30. 5 Transmitter Transition Time Tests Probing for Transition Time Tests When performing transition time tests, the DVI Electrical Performance Validation and Compliance Software will prompt you to make the proper connections (also shown in the figures that follow). TPA2-P Adapter Board DVI Connector DVI Source (DUT) D0/D1/D2 Test Point + - Damping Resistors 54854A/54855A Oscilloscope E2678A Differential Socket Probe Head Ch2 Ch3 Ch4 1132A/1134A Probe Amplifier Figure 14 Probing Data Channels for Transition Time Tests (TPA2 Fixture) TPA2-P Adapter Board CRU Board Damping Resistors E2678A Differential Raw Clock Test Point Socket Probe Head DVI Connector DVI + + + Source - - - (DUT) SMA to SMA 1132A/1134A Cables Probe Amplifier 54854A/54855A Oscilloscope Ch2 Ch3 Ch4 Figure 15 Probing Raw Clock for Transition Time Tests (TPA2 Fixture) 30 DVI Compliance Testing Methods of Implementation
  31. 31. Transmitter Transition Time Tests 5 TPA-P Test Access Board DVI Connector DVI D0/D1/D2 Source E2678A Differential 1132A/1134A Test Point Socket Probe Head Probe Amplifier (DUT) + - Damping Resistors 54854A/54855A Oscilloscope Ch2 Ch3 Ch4 Figure 16 Probing Data Channels for Transition Time Tests (TPA Fixture) TPA-P Test Access Board DVI Connector DVI Source (DUT) Raw Clock Test Point - + Damping Resistors 54854A/54855A Oscilloscope E2678A Differential Socket Probe Head Ch2 Ch3 Ch4 1132A/1134A Probe Amplifier Figure 17 Probing Raw Clock for Transition Time Tests (TPA Fixture) You can use any of the oscilloscope channels for the data and raw clock test points. You identify the channels used for each signal in the Configuration tab of the DVI Electrical Performance Validation and Compliance Software. (The channels shown in the preceding figures are just for example.) DVI Compliance Testing Methods of Implementation 31
  32. 32. 5 Transmitter Transition Time Tests Transition Time Test Method of Implementation Risetime/falltime is a differential measurement across the outputs of a differential pair. The transition is defined as the time interval between the normalized 20% and 80% amplitude levels. Test Definition Notes from the Specification See section 4.7.4, Transmitter Rise/Fall Time, in the DVI Specification Revision 1.0. Test Procedure 1 Start the automated testing application as described in “Starting the DVI Electrical Performance Validation and Compliance Software" on page 15. 2 In the DVI Test application, click the Select Tests tab. 3 Navigate to the Transition Time group and the Clock or Data group, and check the appropriate risetime/falltime test. Figure 18 Selecting Transition Time Tests 4 Follow the DVI Test application’s task flow to set up configuration options, make oscilloscope connections, run the test, and view the test results. Table 3 Transition Time Test Configuration Options Configuration Option Description Device Description Lets you enter information about the device under test, including the device ID and any comments that you wish to include. 32 DVI Compliance Testing Methods of Implementation
  33. 33. Transmitter Transition Time Tests 5 Table 3 Transition Time Test Configuration Options (continued) Configuration Option Description Test Fixture Identifies the revision of your test fixture. Agilent recommends test fixture TPA2. Raw Clock Identifies the oscilloscope channel probing the raw clock. D0/D1/D2 Identifies the oscilloscope channels probing data channel links D0, D1, and D2. Test Freq Identifies the frequency of the DVI interface you are testing. You can [Screen Resolution] select one of the frequencies from the drop-down list, or you can enter a frequency in the range from 25 to 165 MHz. Number of edges Specifies the number of acquisitions to use when performing the (Transition Time) rise/fall time measurements. PASS Condition 75 ps ≤ Risetime/Falltime ≤ 0.4 Tbit The bit time Tbit is one tenth of the pixel time. The bit time is also referred to as one Unit Interval, or UI, in the jitter and eye diagram specification. Measurement Algorithm The oscilloscope is set up to look for a waveform with 7 bits of 0 followed by 7 bits of 1 inside the pseudo-random pattern (using advanced comm triggering). When this waveform is found, it is used to determine Vtop (100%) and Vbase (0%) for the rise/fall time measurements. All subsequent risetime/falltime measurements are performed using simple edge triggering only. Test References Section 4.3, Transmitter Electrical Specifications, in the DVI Specification Revision 1.0. DVI Compliance Testing Methods of Implementation 33
  34. 34. 5 Transmitter Transition Time Tests 34 DVI Compliance Testing Methods of Implementation
  35. 35. N5394A DVI Electrical Performance Validation and Compliance Software Compliance Testing Methods of Implementation 6 Transmitter Inter-Pair Skew Tests Probing for InterPairSkew Tests 36 D0/D1, D0/D2, D1/D2 - Skew Test Method of Implementation 38 Agilent Technologies 35
  36. 36. 6 Transmitter Inter-Pair Skew Tests Probing for InterPairSkew Tests When performing inter-pair skew tests, the DVI Electrical Performance Validation and Compliance Software will prompt you to make the proper connections (also shown in Figure 19 or Figure 20). Be sure to match the polarity of the differential probe to the polarity of the probed signals; NOTE otherwise, the tests will not run correctly. TPA2-P Adapter Board DVI Connector DVI Source E2678A Differential 1132A/1134A Data Socket Probe Head Probe Amplifier (DUT) Channel + Test Points + - - Damping Resistors 54854A/54855A Oscilloscope E2678A Differential Socket Probe Head Ch2 Ch3 Ch4 1132A/1134A Probe Amplifier Figure 19 Probing for Inter-Pair Skew Tests (TPA2 Fixture) 36 DVI Compliance Testing Methods of Implementation
  37. 37. Transmitter Inter-Pair Skew Tests 6 TPA-P Test Access Board E2678A Differential 1132A/1134A Socket Probe Head Probe Amplifier DVI Connector DVI + Data Source Channel - (DUT) Test Points + - Damping Resistors 54854A/54855A Oscilloscope Ch2 Ch3 Ch4 Figure 20 Probing for Inter-Pair Skew Tests (TPA Fixture) You can use any of the oscilloscope channels for the data test points. You identify the channels used for each signal in the Configuration tab of the DVI Electrical Performance Validation and Compliance Software. (The channels shown in Figure 19 and Figure 20 are just for example.) DVI Compliance Testing Methods of Implementation 37
  38. 38. 6 Transmitter Inter-Pair Skew Tests D0/D1, D0/D2, D1/D2 - Skew Test Method of Implementation The transmitter skew is the time difference between the two differential signals measured at the normalized 50% crossover point. The trigger source can be either one of the differential signals. Channel-to-channel de-skew must be performed on the two oscilloscope channels used for this measurement (see “Channel-to-Channel De-skew" on page 63). Test Definition Notes from the Specification See section 4.7.5, Transmitter Skew Measurement, in the DVI Specification Revision 1.0. Test Procedure 1 Start the automated testing application as described in “Starting the DVI Electrical Performance Validation and Compliance Software" on page 15. 2 In the DVI Test application, click the Select Tests tab. 3 Navigate to the InterPairSkew group, and check the appropriate skew test. Figure 21 Selecting InterPairSkew Tests 4 Follow the DVI Test application’s task flow to set up configuration options, make oscilloscope connections, run the test, and view the test results. 38 DVI Compliance Testing Methods of Implementation
  39. 39. Transmitter Inter-Pair Skew Tests 6 Table 4 InterPairSkew Test Configuration Options Configuration Option Description Device Description Lets you enter information about the device under test, including the device ID and any comments that you wish to include. Test Fixture Identifies the revision of your test fixture. Agilent recommends test fixture TPA2. D0/D1/D2 Identifies the oscilloscope channels probing data channel links D0, D1, and D2. Test Freq Identifies the frequency of the DVI interface you are testing. You can [Screen Resolution] select one of the frequencies from the drop-down list, or you can enter a frequency in the range from 25 to 165 MHz. Number of edges Specifies the number of acquisitions to use when performing the (InterPairSkew) inter-pair skew measurements. PASS Condition ≤ 0.20 Tpixel The pixel time Tpixel is the time period of the raw clock. Measurement Algorithm 1 Trigger on the rising edge of the lowest data lane number. (D0/D1 use D0, etc.). 2 Measure the time from the first signal's rising edge to the second signal’s rising edge at 50% crossing. 3 Repeat step 2 for the "Number of edges", record the worst value. 4 Repeat steps 1 through 3 for the falling edge. 5 Report the worst rising skew, falling skew, and the worst among both. Test References Section 4.3, Transmitter Electrical Specifications, in the DVI Specification Revision 1.0. DVI Compliance Testing Methods of Implementation 39
  40. 40. 6 Transmitter Inter-Pair Skew Tests 40 DVI Compliance Testing Methods of Implementation
  41. 41. N5394A DVI Electrical Performance Validation and Compliance Software Compliance Testing Methods of Implementation 7 Cable Assembly Tests Probing for Cable Assembly Eye Pattern Tests 42 D0/D1/D2 - Eye Pattern Test Method of Implementation 44 This section provides the Methods of Implementation (MOIs) for data eye pattern tests using an Agilent 54854A/54855A Infiniium oscilloscope, 1132A/1134A probes, and the DVI Electrical Performance Validation and Compliance Software. Agilent Technologies 41
  42. 42. 7 Cable Assembly Tests Probing for Cable Assembly Eye Pattern Tests When performing cable assembly eye pattern tests, the DVI Electrical Performance Validation and Compliance Software will prompt you to make the proper connections (also shown in Figure 22 or Figure 23). TPA2-R Adapter Board CRU Board DVI Receptacle Raw Clock DVI Receptacle DVI + + DVI Plug DVI Plug Source DVI Cable Assembly - - Recovered (DUT) SMA to SMA Clock D0/D1/D2 Cables Test Point + - SMA to BNC Cable Damping Resistors 54854A/54855A Oscilloscope E2678A Differential Socket Probe Head Ch2 Ch3 Ch4 1132A/1134A Probe Amplifier Figure 22 Probing for Cable Assembly Eye Pattern Tests (TPA2 Fixture) TPA-R Test Access Board DVI Receptacle DVI Receptacle DVI DVI Plug DVI Plug Source DVI Cable Assembly (DUT) D0/D1/D2 Recovered SMA to BNC Test Point Clock Cable - + Damping Resistors 54854A/54855A Oscilloscope E2678A Differential Socket Probe Head Ch2 Ch3 Ch4 1132A/1134A Probe Amplifier Figure 23 Probing for Cable Assembly Eye Pattern Tests (TPA Fixture) 42 DVI Compliance Testing Methods of Implementation
  43. 43. Cable Assembly Tests 7 You can use any of the oscilloscope channels for the recovered clock and data test point. You identify the channels used for each signal in the Configuration tab of the DVI Electrical Performance Validation and Compliance Software. (The channels shown in Figure 22 and Figure 23 are just for example.) DVI Compliance Testing Methods of Implementation 43
  44. 44. 7 Cable Assembly Tests D0/D1/D2 - Eye Pattern Test Method of Implementation Data eye pattern measurements are made as differential measurements using the recovered clock signal as the oscilloscope trigger source. Test Definition Notes from the Specification See section 4.7.6, Transmitter Eye, in the DVI Specification Revision 1.0. Test Procedure 1 Attach a DVI monitor to the DVI source (DUT). 2 Select a resolution for test, and display the pseudo random pattern in full screen mode. 3 Unplug the monitor, and connect the TPA2 plug adapter board directly to the output of the DVI source. 4 Confirm the frequency output of the DVI source by measuring RC+ or RC- on the TPA2 plug board with the oscilloscope. 5 Set the CRU board to operate at the correct frequency. 6 Allow the CRU board to warm up for 5 minutes. 7 Attach the SMA to SMA cables from RC+ and RC- on the TPA2 plug board to the respective SMA connectors on the CRU board. 8 Start the automated testing application as described in “Starting the DVI Electrical Performance Validation and Compliance Software" on page 15. 9 In the DVI Test application, click the Select Tests tab. 10 Navigate to the Data Eye Pattern group, and check the appropriate Eye Pattern test (D0, D1, or D2). Figure 24 Selecting Data Eye Pattern Tests 44 DVI Compliance Testing Methods of Implementation
  45. 45. Cable Assembly Tests 7 11 Follow the DVI Test application’s task flow to set up configuration options, make oscilloscope connections, run the test, and view the test results. Table 5 Cable Assembly Test Configuration Options Configuration Option Description Device Description Lets you enter information about the device under test, including the device ID and any comments that you wish to include. Test Fixture Identifies the revision of your test fixture. Agilent recommends test fixture TPA2. The recovered clock from TPA will have 2.5 times the frequency of the raw clock. TPA2 however will have the same frequency for both clocks. Recovered Clock Identifies the oscilloscope channel probing the recovered clock. D0/D1/D2 Identifies the oscilloscope channels probing data channel links D0, D1, and D2. Test Freq Identifies the frequency of the DVI interface you are testing. You can [Screen Resolution] select one of the frequencies from the drop-down list, or you can enter a frequency in the range from 25 to 165 MHz. Mask Type Choose either “Cable Test Low-amplitude Eye Mask” or “Cable Test High-amplitude Eye Mask”. # Unit Interval Available in Debug Mode, this option specifies the number of UI (Unit Intervals) to measure in the data eye pattern test. The DVI revision 1.0 specification recommends 100,000 acquisitions to achieve 99% confidence within 1% error of the mean value. For full compliance, a measurement of 1,000,000 acquisitions must be made. Note that increasing the number of UI has a negative impact on the run time of the data eye pattern tests. Value used in Compliance Mode: 100,000. Manual Mask Specifies whether the manual mask adjustment is needed prior to the Adjustment mask test. Composite Eye Available in Debug Mode, this option specifies whether all data bits in a pixel need to be overlapped in the eye diagram. Value used in Compliance Mode: Off. Worst Eye Location Available in Debug Mode, this option specifies the location of the worst eye in respect to the rising edge of the recovered clock. This parameter will be ignored if Composite Eye is turned ON. Choose auto to let the application automatically find the worst eye. The worst eye is defined as the bit having the smallest pulse width. Select only 1-4 for the TPA test fixture. Value used in Compliance Mode: Auto. PASS Condition Zero mask failures. DVI Compliance Testing Methods of Implementation 45
  46. 46. 7 Cable Assembly Tests Measurement Algorithm 1 Trigger on the recovered clock; the data lane is being viewed in color grade form. 2 Repeat step 1 until the # Unit Intervals has been reached. 3 The test passes if none of the waveform sample points falls into the mask failure region. Test References Section 4.5, Cable Assembly Specifications, in the DVI Specification Revision 1.0. 46 DVI Compliance Testing Methods of Implementation
  47. 47. N5394A DVI Electrical Performance Validation and Compliance Software Compliance Testing Methods of Implementation A Calibrating the 54854A/54855A Digital Storage Oscilloscope Required Equipment for Calibration 47 Internal Calibration 48 Cable and Probe Calibration 54 Channel-to-Channel De-skew 63 This appendix describes the Agilent 54854A/54855A digital storage oscilloscope calibration procedures. Required Equipment for Calibration To calibrate the 54854A/54855A oscilloscope in preparation for running the DVI automated tests, you need the following equipment: • Keyboard, qty = 1, (provided with the Agilent 54854A/54855A oscilloscope). • Mouse, qty = 1, (provided with the Agilent 54854A/54855A oscilloscope). • Precision 3.5 mm BNC to SMA male adapter, Agilent p/n 54855-67604, qty = 2 (provided with the Agilent 54854A/54855A oscilloscope). • Calibration cable (provided with the Agilent 54854A/54855A oscilloscope). • BNC shorting cap (provided with the Agilent 54854A/54855A oscilloscope). Figure 25 below shows a drawing of the above connector items. Figure 25 Accessories Provided with the Agilent 54854A/54855A Oscilloscope Agilent Technologies 47
  48. 48. A Calibrating the 54854A/54855A Digital Storage Oscilloscope • 50-ohm Coax Cable with SMA Male Connectors – 24-inch or less RG316/U or similar, qty = 2, matched length. • SMA T-adapter. • BNC to SMA male adapter, qty = 1. Figure 26 below shows an example of the above mentioned cables and connectors needed. Figure 26 Additional Cables and Adapters Internal Calibration This will perform an internal diagnostic and calibration cycle for the oscilloscope. For the Agilent oscilloscope, this is referred to as Calibration. This Calibration will take about 20 minutes. Perform the following steps: 1 Set up the oscilloscope with the following steps: a Connect the keyboard, mouse, and power cord to the rear of the oscilloscope. b If SigTest is being used on the oscilloscope, then connect a second monitor to the VGA connector located near the LAN port, on the rear of the oscilloscope. c Plug in the power cord. d Turn on the oscilloscope by pressing the power button located on the lower left of the front panel. e Allow the oscilloscope to warm up at least 30 minutes prior to starting the calibration procedure in step 3 below. 48 DVI Compliance Testing Methods of Implementation
  49. 49. Calibrating the 54854A/54855A Digital Storage Oscilloscope A 2 Locate and prepare the accessories that will be required for the internal calibration: a Locate the BNC shorting cap. b Locate the calibration cable. c Locate the two Agilent precision SMA/BNC adapters. d Attach one SMA adapter to one end of the calibration cable - hand tighten snugly. e Attach the other SMA adapter to the other end of the calibration cable - hand tighten snugly. 3 Referring to Figure 27 below, perform the following steps: a Click on the Utilities>Calibration menu to open the Calibration window. Click here to open the calibration window. Figure 27 Accessing the Calibration Menu. 4 Referring to Figure 28 below, perform the following steps to start the calibration: a Uncheck the Cal Memory Protect checkbox. b Click the Start button to begin the calibration. DVI Compliance Testing Methods of Implementation 49
  50. 50. A Calibrating the 54854A/54855A Digital Storage Oscilloscope Uncheck this first Then click here to start Figure 28 Oscilloscope Calibration Menu. 5 Follow the on-screen instructions: a You will be prompted to disconnect everything from all the inputs, click the OK button. b Then, you will be prompted to connect BNC shorting cap to a specified input. Install the BNC shorting cap by pressing it on the specified input BNC, and turning right. Click the OK button after moving the BNC cap to each specified channel. c Then you will be prompted to connect the calibration cable with SMA adapters between the Aux Out and a specified input, as shown in the example in Figure 29 below. Install the SMA adapter by pressing it on input BNC, and hand tightening the outer ring turning right. Click the OK button after connecting the cable as prompted. 50 DVI Compliance Testing Methods of Implementation
  51. 51. Calibrating the 54854A/54855A Digital Storage Oscilloscope A Precision SMA Adapter on Aux Out Precision SMA Adapter Calibration Cable on Channel 1 Input Figure 29 Calibration Cable Connection Example. d Early during the calibration of channel 1, you will be prompted to perform a Time Scale Calibration, as shown in Figure 30 below. e Click on the Default button to continue the calibration, using the Factory default calibration factors. f When the calibration procedure is complete, you will be prompted with a Calibration Complete message window. Click the OK button to close this window. DVI Compliance Testing Methods of Implementation 51
  52. 52. A Calibrating the 54854A/54855A Digital Storage Oscilloscope Click Default Figure 30 Time Scale Calibration Menu. 6 Referring to Figure 31 below, perform the following steps: a Confirm that the Vertical and Trigger Calibration Status for all Channels passed. b Click the Close button to close the calibration window. c The internal calibration is completed. d Read NOTE below. 52 DVI Compliance Testing Methods of Implementation
  53. 53. Calibrating the 54854A/54855A Digital Storage Oscilloscope A Delta Calibration Temperature Verify Calibration Passed Close this menu Figure 31 Calibration Status Screen. These steps do not need to be performed every time a test is run. However, if the ambient NOTE temperature changes more than 5 degrees Celsius from the calibration temperature, this calibration should be performed again. The delta between the calibration temperature and the present operating temperature is shown in the Utilities>Calibration menu. DVI Compliance Testing Methods of Implementation 53
  54. 54. A Calibrating the 54854A/54855A Digital Storage Oscilloscope Cable and Probe Calibration Perform a 50-ohm direct-coupled input calibration for the SMA interface of channel 1 and channel 3. This calibration compensates for gain, offset, and skew errors in cables and probes. Perform the following steps. 1 Referring to the Figure 32 below, perform the following steps: a Locate and connect one of the Agilent precision SMA adapters to the Channel 1 oscilloscope input. b Locate and connect the other Agilent precision SMA adapter to the Channel 3 oscilloscope input. c Locate and connect one end of one of the RG-316 cables to the SMA adapter on Channel 1. d Locate and connect one end of the other RG-316 cable to the SMA adapter on Channel 3. e Locate and connect the non-Agilent SMA/BNC adapter to the Aux Out BNC on the oscilloscope. f Connect the other end of the cable attached to Channel 1 to the SMA adapter on the Aux Out. Channel 1 Channel 3 Aux Out Figure 32 Vertical Input Calibration Connections (Cable on Channel 3 not shown). 54 DVI Compliance Testing Methods of Implementation
  55. 55. Calibrating the 54854A/54855A Digital Storage Oscilloscope A 2 Referring to Figure 33 below, perform the following steps: a Click on the Setup>Channel 1 menu to open the Channel Setup window. b Click the Probes button in the Channel Setup window, to open the Probe Setup window. Click Setup Channel 1 Click here for Probe Setup Menu Figure 33 Channel Setup Window. DVI Compliance Testing Methods of Implementation 55
  56. 56. A Calibrating the 54854A/54855A Digital Storage Oscilloscope 3 Referring to Figure 34 below, perform the following steps: a Click the Configure Probing System button, and then click on User Defined Probes. Click here Then click here Figure 34 Probe Setup Window. 56 DVI Compliance Testing Methods of Implementation
  57. 57. Calibrating the 54854A/54855A Digital Storage Oscilloscope A 4 Referring to Figure 35 below, perform the following steps: a Click on the Calibrate Probe button to open the Probe Calibration window. Click Here Figure 35 User Defined Probe Window. 5 Referring to Figure 36 below, perform the following steps: a Select the Calibrated Atten/Offset Radio Button b Click the Start Atten/Offset Calibration Button to open the Calibration window. DVI Compliance Testing Methods of Implementation 57
  58. 58. A Calibrating the 54854A/54855A Digital Storage Oscilloscope Select Calibrated Atten/Offset Then Click Here Figure 36 Probe Calibration Window. 6 Referring to Figure 37 shown below, perform the following steps: a Ignore the instructions shown in the dialog box. b Click the OK button on the Calibration window. c The calibration should complete in about 10 seconds. Click OK Figure 37 Calibration Window. 58 DVI Compliance Testing Methods of Implementation
  59. 59. Calibrating the 54854A/54855A Digital Storage Oscilloscope A 7 Referring to Figure 38 below, perform the following steps: a Click OK to close the Probe Calibration Done window. Click to close this window Figure 38 Probe Calibration Done Window. 8 Referring to Figure 39 below, perform the following steps: a Select the Calibrated Skew Radio button in the Probe Calibration window b Click the Start Skew Calibration button Select Calibrated Skew Then Click Here Figure 39 Probe Calibration Window. 9 Referring to Figure 40 shown below, perform the following steps: a Ignore the instructions shown in the dialog box. b Click the OK button on the Calibration window. c The calibration should complete in about 10 seconds. DVI Compliance Testing Methods of Implementation 59
  60. 60. A Calibrating the 54854A/54855A Digital Storage Oscilloscope Click OK Figure 40 Calibration Window. 10 Referring to Figure 41 below, perform the following steps: a Click OK to close the Probe Calibration Done window. Click to close this window Figure 41 Calibration Window. 60 DVI Compliance Testing Methods of Implementation
  61. 61. Calibrating the 54854A/54855A Digital Storage Oscilloscope A 11 Referring to Figure 42 below, perform the following steps: a Click the Close button to close this window. Click Close Figure 42 Calibration Window. DVI Compliance Testing Methods of Implementation 61
  62. 62. A Calibrating the 54854A/54855A Digital Storage Oscilloscope 12 Referring to Figure 43 below, perform the following steps: a Click on the Channel 3 tab. Click on Channel 3 Tab Figure 43 Calibration Window. 13 Referring to Figure 32 on page 54, perform the following steps: a Disconnect the RG-316 cable connected to the SMA adapter on the Aux Out. b Connect the other end of the RG-316 cable connected to the SMA adapter on Channel 3, to the SMA adapter on the Aux Out. 14 Repeat steps 3 through 11 of this section to calibrate the cable on Channel 3. 15 Click the Close button on the Probe Setup window (Figure 43) to close this window. 16 Click the Close button on the Channel Setup window (Figure 33 on page 55) to close this window. 17 The Cable and Probe calibration is complete. 18 Read the NOTE below. 62 DVI Compliance Testing Methods of Implementation
  63. 63. Calibrating the 54854A/54855A Digital Storage Oscilloscope A Each cable is now calibrated for the oscilloscope channel it is connected to. Do not switch NOTE cables between channels or other oscilloscopes, or it will be necessary to calibrate them again. It is recommended that the cables be labeled with the channel they were calibrated for. Channel-to-Channel De-skew This procedure ensures that the timing skew errors between channel 1 and channel 3 are minimized. Perform the following steps: 1 Referring to Figure 44 below, perform the following steps: a Do not disconnect the RG-316 cables from either the Channel 1 or Channel 3 SMA adapters. b If not already installed, install the non-Agilent SMA adapter on the oscilloscope Aux Out. c Disconnect any cable connected to the SMA adapter on the Aux Out. d Locate and connect the middle branch of the SMA Tee to the SMA adapter on the Aux Out BNC. e Connect the far end of the cable from the Channel 1 SMA adapter, to one branch of the SMA Tee on the Aux Out. f Connect the far end of the cable from the Channel 3 SMA adapter, to the other branch of the SMA Tee on the Aux Out. DVI Compliance Testing Methods of Implementation 63
  64. 64. A Calibrating the 54854A/54855A Digital Storage Oscilloscope SMA Tee on Aux Out Channel 1 Channel 3 Figure 44 De-skew Connection. 2 Referring to Figure 45 below, perform the following steps: a Select the File>Load>Setup menu to open the Load Setup window. b Navigate to the directory location that contains the INF_SMA_Deskew.set setup file. If the setup file is not available, it can be created by following the instructions in Appendix B, “INF_SMA_Deskew.set Setup File Details”. c Select the INF_SMA_Deskew.set setup file by clicking on it. d Click the Load button to configure the oscilloscope from this setup file. 64 DVI Compliance Testing Methods of Implementation

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