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Tektronix TDSDDM1 User Manual

Tektronix TDSDDM1 User Manual

Disk drive measurement application
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User Manual
TDSDDM1
Disk Drive Measurement Application
071-0174-02
This document supports software version 1.0.26
and above.

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Summary of Contents for Tektronix TDSDDM1

  • Page 1 User Manual TDSDDM1 Disk Drive Measurement Application 071-0174-02 This document supports software version 1.0.26 and above.
  • Page 2 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...
  • Page 3 WARRANTY Tektronix warrants that the media on which this software product is furnished and the encoding of the programs on the media will be free from defects in materials and workmanship for a period of three (3) months from the date of shipment.

  • Page 5: Table Of Contents

    ........... 3–3 TDSDDM1 Disk Drive Measurement Application User Manual...
  • Page 6 ........A–1 Index TDSDDM1 Disk Drive Measurement Application User Manual...
  • Page 7 Table of Contents List of Figures Figure 1–1: TDSDDM1 Disk Drive Measurement Application ..1–1 Figure 1–2: Primary setup connections ......
  • Page 8 ... . . 3–47 Figure 3–28: Track profile reference memory ....3–48 TDSDDM1 Disk Drive Measurement Application User Manual...
  • Page 9 ....1–11 Table A–1: TDSDDM1 Disk Drive Measurement Application measurements ......... .
  • Page 10 Table of Contents TDSDDM1 Disk Drive Measurement Application User Manual...
  • Page 11 Application. Conventions This manual uses the following conventions: H For brevity, this manual generally refers to the TDSDDM1 Disk Drive Measurement Application as the Disk Drive Measurement Application or simply as the application. H When steps require that you make a sequence of selections using front panel...
  • Page 12 For product support outside of North America, contact your local Tektronix distributor or sales office. Service Contact your local Tektronix distributor or sales office. Or visit Support our web site for a listing of worldwide service locations. http://www.tek.com For other...
  • Page 13 Getting Started...

  • Page 15: Product Description

    Option HD (hard disk drive) or Option 2M (hard disk drive plus 8 MB record length), and with firmware version 5.2e and up For a current list of compatible oscilloscopes, check the Tektronix, Inc. web site, http://www.tektronix.com/Measurement/scopes/index.html in the Software and Drivers category.

  • Page 16: Requirements And Restrictions

    The application does not support control by external GPIB commands. Updates You can find information about this and other applications at the Tektronix, Inc. web site, http://www.tektronix.com/Measurement/scopes/index.html in the Software and Drivers category. Check this site for application updates that you can download and for free applications.

  • Page 17: Installation

    Readme.txt file on the floppy disk. You should insert the floppy disk into a DOS-based personal computer and read the file before you continue. If you are updating the application, the Readme.txt file on the Tektronix ftp site supercedes the Readme.txt file on the floppy disk.

  • Page 18: Updates Through A Web Browser

    4. Remove the floppy disk and cycle power to the oscilloscope. Updates Through a Web Browser If there is an update for this application, it will be available from the Tektronix ftp site. To install an application update, you will need to download it from the ftp site to a hard disk, copy it to a blank DOS-formatted floppy disk, and then install it on your oscilloscope.

  • Page 19: Figure 1-2: Primary Setup Connections

    NOTE. Some disk drives mark the beginning of a track by the absence of a sector pulse. For this case, a timeout trigger setup is needed to identify the beginning of the track. The Disk Drive Measurement Application does not support this configuration. 1–5 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 20: Figure 1-3: Secondary Setup Connections

    Connect the disk drive to the oscilloscope as shown in Figure 1–3. Test oscilloscope Disk drive CH 1 CH 2 Read Gate signal (standard probe) Read signal (differential probe) Figure 1–3: Secondary setup connections 1–6 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 21: Configuration

    Set the mode to Normal by pressing Mode & Holdoff (main) Normal (side). d. Set the level by pressing Level (main) and then selecting a level appropriate to your signal. 1–7 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 22: Setting Up The Application Trigger

    Using the general purpose knob, select hd0, and then press SELECT. (Depending on previous actions, you might not need to do this step.) c. Using the general purpose knob, select TDSDDM1.APP. d. Press Activate Application (side). 2. Press Trigger (main) Mode (side).

  • Page 23: Figure 1-4: Selecting The Sectors To Measure

    Read channel waveform. For a peak or trough to be found, the signal must be greater than the hysteresis level. Hysteresis is a global setting that is used by measurements such as TAA, PW50, time asymmetry, and time between peaks. 1–9 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 24: Figure 1-5: Using Hysteresis To Avoid False Identification Of Peaks

    For example, if you enter a value of 2 divisions, the hysteresis levels are at +2 divisions and –2 divisions. 1–10 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 25: Figure 1-6: Hysteresis Menu

    Index pulse, marking the beginning of the track This signal is used for triggering only when the Trigger/Mode/Read Gate menu item has been selected. This signal is used for triggering only when the Trigger/Mode/Sector menu item has been selected. 1–11 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 26: Figure 1-7: The Input Channels Menu

    1. From the application display, go to the Input Channels menu by pressing –menu– (main) Input Channels (side). See Figure 1–7. 2. Using the side menu buttons, assign the disk drive signals to the appropriate channels. Figure 1–7: The Input Channels menu 1–12 TDSDDM1 Disk Drive Measurement Application User Manual...
  • Page 27 Operating Basics...

  • Page 29: Functional Overview

    2. Using the general purpose knob, select hd0, and then press SELECT. (Depending on previous actions, you might not need to do this step.) 3. Using the general purpose knob, select TDSDDM1.APP. 4. Press Activate Application (side). The application starts up and displays as shown in Figure 2–2.

  • Page 30: Figure 2-1: Starting The Application

    Functional Overview Figure 2–1: Starting the application 2–2 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 31: Figure 2-2: Disk Drive Measurement Application Initial Display

    APPLICATION front-panel menu buttons as shown in Figure 2–3. To exit the application, press Utility (main) Exit (side). Push the SHIFT and APPLICATION buttons to return to the application. Figure 2–3: Returning to the application 2–3 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 32: Figure 2-4: Selecting A Measurement From The Measure Menu

    Make any further selections required by the measurement. (See Measurement Descriptions on page 3–11 for information about individual measurements.) Press –menu– for next menu page Figure 2–4: Selecting a measurement from the Measure menu 2–4 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 33: Figure 2-5: The Control Menu

    Pause. After fulfilling the requirements specified in the message box, you must press Continue (side) to finish the measurement. Figure 2–5: The Control menu 2–5 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 34: Viewing The Waveform

    Display the local help as follows: 1. Display the help by pressing Utility (main) Help (side). 2. Use the side menu buttons to navigate within the help. 2–6 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 35: Tutorial

    1. Press SETUP Select Application. See Figure 2–1. 2. Using the general purpose knob, select hd0, and then press SELECT. 3. Using the general purpose knob, select TDSDDM1.APP. 4. Press Activate Application (side). The application starts up and displays its initial screen.

  • Page 36: Figure 2-6: Track Average Amplitude (Taa) Measurement

    1. Select the PW50 measurement by pressing Measure (main) PW50 (side). 2. Select cursor gating by pressing –menu– (main) Cursor Gating (main) On/Off (side). Select ON. 3. Place the cursors over the desired segment of the waveform. 2–8 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 37: Figure 2-7: Pulse Width At 50% (Pw50) Measurement With Cursor Gating

    Start (side) to start the test. 9. Wait for the measurement to complete, then view the results as shown in Figure 2–7. Figure 2–7: Pulse width at 50% (PW50) measurement with cursor gating 2–9 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 38: Gating

    11. Move the cursor to a point of interest on the track profile waveform. 12. Press Value At Cursor (side) or Sector At Cursor (side) to view the measure- ment results at the current cursor position. 2–10 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 39: Figure 2-8: Track Profile Measurement

    1. Press the SHIFT and then the APPLICATION button to return to the application. 2. Press Utility (main) Save Setup (side). 3. Press Save to Selected File (side). 4. To exit the application, press Utility (main) Exit (side). To confirm, press OK (side). 2–11 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 40: Example 5: Recalling A Setup

    To recall the oscilloscope setup, refer to the user manual for your oscilloscope. The procedure varies between models. To recall the application setup, follow these steps: 1. Start the application as described on page 2–7. 2. Press Utility (main) Recall Setup (side). 2–12 TDSDDM1 Disk Drive Measurement Application User Manual...
  • Page 41 Reference...

  • Page 43: Figure 3-1: Selecting Menus

    Menu Structure This section discusses the menus used in the TDSDDM1 Disk Drive Measure- ment Application. Included are brief descriptions of the menus and a menu structure map which shows the relationship between menus. Menu Summary There are two pages of menu selections in the Disk Drive Measurement Application.
  • Page 44 1–11. Cursor Gating Menu Use the Cursor Gating menu if you want to localize measurements to a specific area of the waveform. See Cursor Gating on page 3–7 for more information. 3–2 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 45: Menu 1

    On/Off Track Profile To Track Profile Value At Cursor Sector At Cursor Reset Profile Mode Single Start Free Run Control Pause Continue Stop Help Exit Utility Save Setup Recall Setup Default Setup 3–3 TDSDDM1 Disk Drive Measurement Application User Manual...
  • Page 46 Menu Structure 3–4 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 47: Setup Parameters

    H To store the current application settings, press Utility (main) Save Setup (side). The settings are stored in the file tdsddm1.ini on the hard disk. Once you have saved a setup, that setup will be recalled upon starting the Disk Drive Measurement Application.

  • Page 48: Figure 3-2: Save Setup And Recall Setup Selections In The Utility

    3. If you have not already done so, set the Preamble Duration as described in step 4 of Setting Up the Application Trigger, on page 1–8. See also Cursor Gating on page 3–7 for another method of localizing measure- ments. 3–6 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 49: Figure 3-3: Selecting The Sectors To Measure

    With cursor gating, you use the oscilloscope cursors to indicate the area of interest on the waveform record. See Figure 3–4. Localizing measurement can speed up processing and eliminate unwanted data from your analysis. 3–7 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 50: Figure 3-4: Localizing A Measurement Using Cursor Gating

    NOTE. The cursor gating function in this menu applies to the measurements in the Disk Drive Measurement Application only. It does not apply to measure- ments in the main Measure menu of the oscilloscope. 3–8 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 51: Figure 3-5: Limit Test Results

    2. Press –menu– (main) Limit Test (main) On/Off (side). Select ON. See Figure 3–6. 3. Set the upper and lower limits for the measurement. 4. Repeat steps 1 and 3 for each measurement. 3–9 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 52: Figure 3-6: Setting Pass/Fail Limits

    Setup Parameters Figure 3–6: Setting pass/fail limits 3–10 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 53: Figure 3-7: Standard Measurement, Snapshot Measurement, And Track Profile

    Snapshots list measurement data for that measurement group. Track profiles collect all the data for each individual track and display the data graphically. Figure 3–7: Standard measurement, snapshot measurement, and track profile 3–11 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 54: Warning Messages

    The application warns you if the number of samples in the measurement is less than 25. Similarly, the application warns you of low vertical resolution if the number of digitizing levels is below 50. 3–12 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 55: Figure 3-8: Track Average Amplitude Measurement

    Definition The track average amplitude measurement, TAA, is defined as follows: N–1 TAA + i + 0 Where: N is the number of positive and negative pulse pairs is the peak-to-peak voltage 3–13 TDSDDM1 Disk Drive Measurement Application User Manual...
  • Page 56 Take one sample on either side of the minimum value and average the three values to obtain the negative peak value. 3. Average all measured peak-to-peak values. The result is the TAA value. 3–14 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 57: Figure 3-9: Taa Measurement

    Measurement Descriptions Peak Trough Figure 3–9: TAA measurement 3–15 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 58: Figure 3-10: Taa- Measurement

    Figure 3–10: TAA– measurement Definition The track average amplitude positive or negative measurement is defined as follows: N–1 TAA "+ i + 0 3–16 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 59: Figure 3-11: Taa+ And Taa- Measurements

    TAA measurement, described on page 3–13, with the exception that only positive pulses are measured for TAA+ and only negative pulses are measured for TAA–. Peak TAA+ TAA– Trough Figure 3–11: TAA+ and TAA– measurements 3–17 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 60: Figure 3-12: Pw50 Measurement

    For further information, see Setting Up the Application Trigger on page 1–8, Measuring Over a Range of Sectors on page 3–6, and Cursor Gating on page 3–7. 3. Press Control (main) Start (side) to start the measurement. 3–18 TDSDDM1 Disk Drive Measurement Application User Manual...
  • Page 61 H There must be enough pulses around the recording track to provide an adequate statistical sample. H The spacing between pulses must minimize any interaction between the measured pulses. 3–19 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 62: Figure 3-13: Parameters For Pw50 Disk Drive Measurements

    Measurement Descriptions Peak PW50+ 1/2 peak to baseline Baseline PW50 – Trough Figure 3–13: Parameters for PW50 disk drive measurements 3–20 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 63: Figure 3-14: Pw50+ Measurement

    The application performs the measurement according to the same algorithm used in the PW50 measurement, described on page 3–18, with the exception that only positive pulses are measured for PW50+ and only negative pulses are measured for PW50–. 3–21 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 64: Figure 3-15: Parameters For Pw50+ And Pw50- Disk Drive Measurements

    Measurement Descriptions Peak PW50+ 1/2 peak to baseline Baseline PW50 – Trough Figure 3–15: Parameters for PW50+ and PW50– disk drive measurements 3–22 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 65: Nonlinear Transition Shift, Nlts

    The difference is that the transitions are separated by two bit periods, not one. When nonlinear transition shift can be characterized, its behavior can be mitigated with write pre-compensation. 3–23 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 66: Figure 3–16: Nlts Measurement

    (t) [ V t – – V t – – Where: is the playback voltage for a readback channel affected by NLTS initial magnetization V(t) is the playback voltage in the absence of nonlinear effects 3–24 TDSDDM1 Disk Drive Measurement Application User Manual...
  • Page 67 V t ) M V t ) M V t – V t – – T – – Where: is the playback voltage for a readback channel affected by NLTS second adjacent transition 3–25 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 68: Figure 3–17: Selecting An Nlts Measurement

    1. Access the NLTS measurements by pressing Measure (main). (If necessary, press –more– (side) until the NLTS measurement is shown.) 2. Select one of the NLTS measurements in the side menu. See Figure 3–17. Figure 3–17: Selecting an NLTS measurement 3–26 TDSDDM1 Disk Drive Measurement Application User Manual...
  • Page 69 (The application removes invalid polynomials from the selection set.) The polynomial index value on the scale is a condensed notation of the selected polynomial, obtainable by making x=2. 3–27 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 70: Figure 3–18: Specifying The Nlts Polynomial

    Measuring Over a Range of Sectors on page 3–6, and Cursor Gating on page 3–7. 7. Press Control (main) Start (side) to start the measurement. 8. Wait for the measurement results to display. 3–28 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 71: Measurements

    The NLTS measurement uses several cycles of the waveform to improve the accuracy of the measurement, averaging over multiple single-waveform- cycle NLTS values. NLTS values for the auto-correlation method are linearly related to the autocorrelation of the acquired waveform at different time delays. 3–29 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 72: Signal-To-Noise Ratio, Snr

    The noise is assumed to be responsible for all the nonperiodic behavior of the acquired waveform. Noise samples are assumed to be independent and identically distributed. The SNR measurement is defined as follows: SNR + 10 log 3–30 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 73: Figure 3–20: Specifying The Snr Parameters

    Figure 3–20: Specifying the SNR parameters 3. Press Duration Tolerance (side). Specify the tolerance of your pattern duration estimate (up to 30%). Using a tighter tolerance reduces measure- ment time. 3–31 TDSDDM1 Disk Drive Measurement Application User Manual...
  • Page 74 H The oscilloscope must capture at least three periods of the pattern. This depends on the waveform length, the oscilloscope sample rate specified, the pattern duration specified, and the number of bits per period. 3–32 TDSDDM1 Disk Drive Measurement Application User Manual...
  • Page 75 (up to 30%) of its real value. The SNR measurement uses several cycles of the waveform to improve the accuracy of the measurement, averaging over multiple single-waveform- cycle SNR values. 3–33 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 76: Overwrite

    Figure 3–21: Overwrite measurement Definition The Overwrite measurement is defined as follows: Overwrite(dB) + 20 log Where: is the residual RMS amplitude is the RMS amplitude 3–34 TDSDDM1 Disk Drive Measurement Application User Manual...
  • Page 77 ) through a narrow band filter tuned to f1. 4. Overwrite track with data at a high frequency f2. 5. Measure residual RMS amplitude (V ) at f1 again. 6. Calculate the results. 7. Display the results. 3–35 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 78: Resolution

    The resolution measurement is the ratio of TAA at two different write frequen- cies, as follows: TAA ( f Resolution + * 100% TAA ( f Where: is the high-frequency TAA measurement is the low-frequency TAA measurement 3–36 TDSDDM1 Disk Drive Measurement Application User Manual...
  • Page 79 6. Erase the disk track using the PC. 7. Using the PC, write a low-frequency data pattern of isolated pulses to the disk. 8. Press Continue (side) to resume the measurement. 9. Wait for the measurement results to display. 3–37 TDSDDM1 Disk Drive Measurement Application User Manual...
  • Page 80 5. Overwrite the track with data at a low frequency f2. 6. Measure the TAA over the selected range of sectors. 7. Calculate the ratio of the low-frequency TAA to the high-frequency TAA. 8. Display the results. 3–38 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 81: Asperity

    The recommended initial setting is at least twice the peak value of the signal. If the signal crosses this level, it is counted as an asperity. No additional asperities are counted until the signal crosses zero volts again. 3–39 TDSDDM1 Disk Drive Measurement Application User Manual...
  • Page 82 The application enters each asperity into a queue for display. Up to ten asperities are listed; if more than ten asperities are displayed, the list scrolls to display the latest asperities. 3–40 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 83: Snapshot Measurements

    1.0 indicates that TAA– = 0.0 (no negative pulses) –1.0 indicates that TAA+ = 0.0 (no positive pulses) The vertical asymmetry measurement is not available as an individual measure- ment. It is available only in the TAA snapshot display. 3–41 TDSDDM1 Disk Drive Measurement Application User Manual...
  • Page 84 The range of the measurement within each sector is determined by the cursors. A constant frequency sequence is written onto a track. 3–42 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 85: Figure 3–25: Time Pt And Time Tp Measurements

    Time Trough-to-Peak (Time TP) These measurements are available only as part of the Snapshot measurements. Time PT Peak Trough Time TP Figure 3–25: Time PT and Time TP measurements 3–43 TDSDDM1 Disk Drive Measurement Application User Manual...
  • Page 86 Measurement Descriptions 3–44 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 87: Track Profiles

    Trigger menu. (The Trigger Mode must be set to Sector to enable the sector readout.) Figure 3–26: Track profile waveform 3–45 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 88: Using Track Profiles

    See Figure 3–28 on page 3–48 for an example of a track profile waveform during Free Run mode. 3–46 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 89: Figure 3–27: Specifying The Track Profile Parameters

    In addition, the cursor readout values in the side menu are deleted when you do the following: H Change the measurement type in the Measure menu H Press Reset Profile 3–47 TDSDDM1 Disk Drive Measurement Application User Manual...

  • Page 90: About The Track Profile Reference Memory

    Figure 3–28: Track profile reference memory 3–48 TDSDDM1 Disk Drive Measurement Application User Manual...
  • Page 91 Appendices...

  • Page 93: Appendix A: Specifications

    Appendix A: Specifications Table A–1 lists the measurements provided by the TDSDDM1 Disk Drive Measurement Application. Table A–1: TDSDDM1 Disk Drive Measurement Application measurements Abbrevi- ation Measurement name Description Track Average Amplitude Measures the average peak-to-peak value of the data on the Read signal.
  • Page 94 Appendix A: Specifications A–2 TDSDDM1 Disk Drive Measurement Application User Manual...
  • Page 95 Index...
  • Page 97 Free Run acquisition mode, 2–5, 3–12 Resolution, 3–36 Snapshot, 3–11, 3–41 SNR, 3–30 Standard, 3–11, 3–12 Gated cursor measurements, 3–7 Starting, 2–4 GPIB, 1–6 TAA, 3–13 GPIB commands, 2–6 TAA+ and TAA–, 3–16 Index–1 TDSDDM1 Disk Drive Measurement Application User Manual...
  • Page 98 Time peak-to-trough and time trough-to-peak, 3–43 Updates, 1–2 Timing asymmetry, 3–42 PW50, 3–18 Track, Setup issues, 1–5 Measurement example, 2–8 Track profile, Measurement example, 2–10 PW50+ and PW50–, 3–21 Track profile measurements, 3–11, 3–45 Index–2 TDSDDM1 Disk Drive Measurement Application User Manual...
  • Page 99 Viewing obscured parts of the waveform, 2–6 Trigger menu, 1–8 Tutorial, 2–7 Warning messages, 3–12 Waveform, Viewing obscured portions, 2–6 Upper and lower limits, 3–9 Web site, 1–2 User trigger mode, 1–8 Index–3 TDSDDM1 Disk Drive Measurement Application User Manual...
  • Page 100 Index Index–4 TDSDDM1 Disk Drive Measurement Application User Manual...

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