Tektronix VM700T User Manual
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Tektronix VM700T User Manual

Tektronix VM700T User Manual

Option 1g echo and rounding errors measurements
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User Manual
VM700T Video Measurement Set
Option 1G Echo and Rounding Errors
Measurements
070-9651-00
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - FAX 781.665.0780 - TestEquipmentDepot.com

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  • Page 1 User Manual VM700T Video Measurement Set Option 1G Echo and Rounding Errors Measurements 070-9651-00 Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - FAX 781.665.0780 - TestEquipmentDepot.com...

  • Page 2: Table Of Contents

    ..........3–5 Index VM700T Option 1G Echo and Rounding Errors Measurements User Manual...
  • Page 3 Table 3–3: Keywords: for get and set commands ......3–5 VM700T Option 1G Echo and Rounding Errors Measurements User Manual...

  • Page 4: Preface

    Options directory window when Option 1G is installed in your VM700T. To view the Video Options directory window, press the Measure button on the front panel. If the VM700T was in the Video Options directory when you last used Measure mode, the Video Options directory displays. Otherwise, touch the Video Options soft key at the bottom of the display to view the Video Options directory.

  • Page 5: Configuring The Option

    Configuring the Option...
  • Page 6 Options directory window when Option 1G is installed in your VM700T. To view the Video Options directory window, press the Measure button on the front panel. If the VM700T was in the Video Options directory when you last used Measure mode, the Video Options directory displays. Otherwise, touch the soft key at the bottom of the display to view the Video Options directory.

  • Page 7: Figure 1-1: The Vm700T Video Measurement Set Configure Menu

    Ï Ï Ï Ï Ï Ï Ï Ï Ï Ï Ï Ï Ï Ï Ï Ï Ï Ï Ï Ï Ï Ï Ï Ï Ï Ï Ï Figure 1–2: Configure menus choices 1–2 VM700T Option 1G Echo and Rounding Errors Measurements User Manual...

  • Page 8: Configuring The Echo Rounding Limits Files

    System Default file cannot be changed. If the System Default Echo Rounding limits file is acceptable, the VM700T uses it (if it is the selected file) to measure input video signals. You can modify the Echo Rounding limits from the system defaults.

  • Page 9: Figure 1-4: File Naming Keyboard

    Figure 1–4: File naming keyboard 4. Touch the key when you have named the file. The VM700T displays the new file that contains the Echo and Rounding limits from the file you selected as the template. You can edit the parameters in this file.

  • Page 10: Editing An Echo Rounding Limit Text Parameter

    3. Touch the soft key to return to the Configure menu. 1–5 VM700T Option 1G Echo and Rounding Errors Measurements User Manual Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - FAX 781.665.0780 - TestEquipmentDepot.com...

  • Page 11: Configuring The Video Source Files

    If the system default video source file is acceptable, the VM700T uses this file as it performs video measurements. To change the Video Source file, complete the steps described in the following procedure.

  • Page 12: Changing The Video Source Parameters

    For more information about the other selections in the Video Source file, see the User manual for your NTSC, PAL, or dual-standard VM700T Video Measure- ment Set 1–7...

  • Page 13: Configuring The Source Selection Video Files

    Configuring the Option Configuring the Source Selection Video Files The Video Limit files used by the VM700T for video measurements are configured in the Video Limit Files directory and specified in the Video Source Files directory. Likewise, the Video Source files are configured in the Video Source Files directory and specified in the Source Selection Video directory.

  • Page 14: Operating Basics

    Operating Basics...

  • Page 15: Echo

    Operating Basics This section provides information on using the two measurements available with the VM700T Option 1G, Echo and Rounding Errors. The Echo measurement determines subjectively whether or not a television signal has too many echoes. Rounding Errors measures the rounding of white level and black level at specified times from the 50% point of the leading and trailing edge of Bar.

  • Page 16: Echo Menu

    Average Num soft key to highlight it, rotate the knob until the desired weighting factor appears, then touch the Average Num soft key again. Cursors displays the Cursors submenu, which provides soft keys to move cursors along the waveform. 2–2 VM700T Option 1G Echo and Rounding Errors Measurements User Manual...

  • Page 17: Figure 2-3: Echo Menu Tree

    Figure 2–3: Echo menu tree Rescale scales the display expansion to an appropriate factor for the Echo measurement’s display graticule. The x- and y-axes adjust to accommodate the rescaled display. 2–3 VM700T Option 1G Echo and Rounding Errors Measurements User Manual...
  • Page 18 Echo measurement. +V Phase (PAL) measures only the +V phase part of the Only signal. –V Phase (PAL) measures only the –V phase part of the Only signal. 2–4 VM700T Option 1G Echo and Rounding Errors Measurements User Manual...

  • Page 19: Figure 2-4: Echo Special Position Display

    Exit leaves the Special Position screen. The main Echo screen is displayed. Figure 2–4: Echo Special Position display 2–5 VM700T Option 1G Echo and Rounding Errors Measurements User Manual...

  • Page 20: Rounding Errors

    The Rounding Errors measurement uses a bar signal. Figure 2–5: Rounding Errors display 2–6 VM700T Option 1G Echo and Rounding Errors Measurements User Manual Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - FAX 781.665.0780 - TestEquipmentDepot.com...

  • Page 21: Rounding Errors Menu

    Cursors provides soft keys for cursor control. Cursors determine measurement locations. Defaults are 0.4 sec and 1.0 sec after the 50% point of the (rising or falling) edge. 2–7 VM700T Option 1G Echo and Rounding Errors Measurements User Manual...
  • Page 22 Special displays the Special Position screen (see Position Figure 2–7) and the Special Position submenu, which provides soft keys to set the measurement locations for the Rounding Errors measurement. 2–8 VM700T Option 1G Echo and Rounding Errors Measurements User Manual...

  • Page 23: Figure 2-7: Rounding Errors Special Position Display

    Bar amplitude is the difference between the Bar Reference and Bar Top levels. With this soft key highlighted, rotate the knob to move the Bar Top position. 2–9 VM700T Option 1G Echo and Rounding Errors Measurements User Manual...
  • Page 24 With this soft key highlighted, rotate the knob to move the Bar Right position. Exit leaves the Measurement Locations display and returns to the Rounding Errors display. 2–10 VM700T Option 1G Echo and Rounding Errors Measurements User Manual...

  • Page 25: Remote Commands And Keywords

    Remote Commands and Keywords...
  • Page 26 You may also control the VM700T remotely using the optional GPIB interface. The command set is the same for the VM700T; however, you will need a computer with a GPIB controller. A user-supplied controller program must also be provided to send the commands and receive the replies of the VM700T.

  • Page 27: Command Format

    VM700T remote operation and have access to the VM700T RS-232 Interface Programmer Manual. Command Format The VM700T remote control commands uses the format shown in Table 3–1 as in the following example: Table 3–1: VM700T Remote Control Commands...

  • Page 28: Get Keyword [Channel-Letter]

    Example: Front panel button names are listed in Table 3–2. Table 3–2: Front Panel Button Names Display Picture Auto Freeze SelectLine Average Graticule Vector 3–3 VM700T Option 1G Echo and Rounding Errors Measurements User Manual...

  • Page 29: Set Keyword [Channel_Letter] Value1 [Value2

    (soft key used as one word) command indicates the press and release of a specified soft key, such as Cursors. The command is equivalent to entering ; however, in general the command should be used instead of these commands. 3–4 VM700T Option 1G Echo and Rounding Errors Measurements User Manual...

  • Page 30: Table 3-3: Keywords: For Get And Set Commands

    –50.00 to 50.00 HROW NTSC Rounding of white (%) –50.00 to 50.00 IROB PAL Rounding of black (%) –50.00 to 50.00 IROW PAL Rounding of white (%) –50.00 to 50.00 3–5 VM700T Option 1G Echo and Rounding Errors Measurements User Manual...
  • Page 31 Index...
  • Page 32 Curve 2 (dB), 2–4 steps, 1–1 Curve 2 (ON/OFF), 2–4 Configure button, 1–1, 3–4 Main menu Configure Files soft key, 1–2 Acquire, 2–3 configuring Average Num, 2–2 Echo Rounding limit file, 1–3 Index-1 VM700T Option 1G Echo and Rounding Errors Measurements User Manual...
  • Page 33 Rescale soft key, 2–3, 2–8 hard key (VM700T Command), 3–3 Rounding Errors Acquire submenu +V Phase Only, 2–9 –V Phase Only, 2–9 Special Position, 2–8 ITS Search soft key, 2–8 Index-2 VM700T Option 1G Echo and Rounding Errors Measurements User Manual...
  • Page 34 Cursors, 2–2, 2–7 parameters, changing, 1–3, 1–5 Cursors On, 2–4, 2–8 Video Source file, 1–1 Curve 2 (dB), 2–4 configuring, 1–6 Curve 2 (ON/OFF), 2–4 editing, 1–6 Delete, 1–5 specifying, 1–8 Index-3 VM700T Option 1G Echo and Rounding Errors Measurements User Manual...
  • Page 35 3–3 getresults, 3–3 hard key, 3–3 weighting factor, specifying, 2–7 set, 3–4 Index-4 VM700T Option 1G Echo and Rounding Errors Measurements User Manual Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - FAX 781.665.0780 - TestEquipmentDepot.com...

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