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User Manual VM700T Video Measurement Set Option 1G Echo and
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1. Main Menu Average Cursors Change Acquire ITS Rescale Num 32 Display Search Cursors Submenu Set Cursor 1 Cursor 2 Cursors Defaul 0 40 us 1 00 us On Acquire Submenu Specia P hase V Phase Position Only Only Special Position Submenu Set Bar Top Ref b Bar Left Bar Right Exit Defaul Default Defaul Defaul Default Figure 2 6 Rounding Errors menu tree Main Menu Average Num Cursors Average Num specifies the weighting factor to use for averaging The Average Num range is 1 to 256 The default value is 32 To change the Average Num value touch the 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 provides soft keys for cursor control Cursors determine measurement locations Defaults are 0 4 usec and 1 0 usec after the 5096 point of the rising or falling edge VM700T Option 1G Echo and Rounding Errors Measurements User Manual Operating Basics Change Display Acquire ITS Search Rescale Change Display changes the display between Rising Edge only Falling Edge only and both Rising Edge and Falling Edge The text readout on the display follows the selected graph Acquire displays the Acquire submenu which controls signal acquisition for the Rounding Errors measurement ITS Search searches the
2. Test Set Ifill ESE ER Ea Ee Back Es C E D Ue JOJEJEJOJ EE em Cancel sett set2 Space smite Figure 1 4 File naming keyboard 4 Touch the Done key when you have named the file The VM 700T 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 System Test Setl Default E NTSC Files In nvram ConfigFiles Echo Rounding NTSC Delete Switch Create Rename Print Leave NTSC PAL File File Directory Figure 1 5 Creating a new file 14 VM700T Option 1G Echo and Rounding Errors Measurements User Manual Configuring the Option Editing an Echo Rounding To change any Echo Rounding limit text parameter Limit Text Parameter S In the editable file rotate the knob to highlight the line that contains the parameter you want to change This includes the title line in the configura tion file Use a descriptive title to easily identify it later This does not change the name of the file 2 Touch the parameter you want to change A box highlights the parameter 3 Rotate the knob to increase or decrease the displayed value for the parameter 4 Touch the Accept Input soft key to accept the change The highlight box disappears and the new parameter displays NOTE If you change a parameter and do not want to save t
3. Main Menu Average Cursors Grats Acquire Rescale Num 32 Cursors Submenu Cursor 1 Cursor 2 Diff Cursors 0 0 ns 0 0 ns 0 0 ns On Grats Submenu Curve 2 Curve 2 3 dB On Acquire Submenu V Phase V Phase Special Only Only Position Special Position Submenu Set Pulse Pos Exit Default Default Figure 2 3 Echo menu tree Rescale 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 VM700T Option 1G Echo and Rounding Errors Measurements User Manual Operating Basics Cursors Submenu Cursor 1 Cursor 2 Diff Cursors On Grats Submenu Curve 2 dB Curve 2 ON OFF Cursor 1 adjusts the horizontal position of cursor 1 displayed as a dashed vertical line The display readout shows the time at the cursor position and the waveform value as a percentage of the waveform peak value The cursor soft key also displays the time at the cursor position Cursor 2 adjusts the horizontal position of cursor 2 displayed as a solid vertical line The display readout shows the time at the cursor position and the waveform value in dB relative to the fixed graticule curve 1 The cursor soft key also displays the time at the cursor position Diff displays the time difference between the cursors This is not a selectable soft key Cursors On turns the cursors on or off for the Echo measure ment Curve 2 dB
4. Configuring the Echo and Rounding Errors option is similar to using the other video functions of the Video Measurement Set A series of files and directories provide default parameters that the VM 700T uses to measure video signals If your application requires parameters other than the defaults supplied with the VM 700T you can configure the Echo and Rounding Errors option according to your preferences To configure and use new parameters in Echo and Rounding Errors measure ments you must perform the following tasks Ww Create your own Echo and Rounding limits file for example Test Set1 and configure it with your limits W Create your own Video Source file for example NewSource and select Test Setl the new limits file you create as the limits file to use m Configure the Source Selection Video file to select the NewSource file as a source file for one or all of the channels A B or C as needed for your measurements The following text describes these configuring steps 1 Press the Configure button to begin configuration of the Echo and Rounding Errors option The screen displays a memory use indicator information about instrument option versions and four soft keys touch screen buttons as shown in Figure 1 1 VM700T Option 1G Echo and Rounding Errors Measurements User Manual 1 1 Configuring the Option Non volatile memory used 52416 bytes free 995904 bytes used 5 VM700T Video Measurement Set X
5. Echo Menu The Echo measurement uses a 2T pulse signal The pulse must be followed by blank space for as long as you want to measure echoes 2T Pulse Echo Wfm gt 1410 Pulse amp Bar Field 1 Line 90 1 0 2 0 3 0 u sec Average Off Curve2 2 dB rel Curvel Figure 2 2 Echo display showing the Curve 2 graticule Pressing the Menu button when the Echo measurement runs displays the Echo main menu Figure 2 3 Main Menu Average Average Num specifies the weighting factor to use for Num averaging The Average Num range is 1 to 256 The default value is 32 To change the Average Num value touch the 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 Cursors displays the Cursors submenu which provides soft keys to move cursors along the waveform VM700T Option 1G Echo and Rounding Errors Measurements User Manual Operating Basics Grats Grats displays the Grats submenu which adjusts the value of curve 2 the second graticule Acquire Acquire displays the Acquire submenu that defines a new position make the waveform measurement and for PAL selects whether only the V Phase or V Phase axis is acquired
6. VM700T Option 1G Echo and Rounding Errors Measurements User Manual 3 1 Remote Commands and Keywords Command Format NOTE The following abbreviated explanation of remote commands assumes you understand the principles of VM700T remote operation and have access to the VM700T RS 232 Interface Programmer Manual The VM700T remote control commands uses the format shown in Table 3 1 as in the following example command argument s Table 3 1 VM700T Remote Control Commands Format Format Description command The actual command name Optional arguments A discussion of command usage and arguments follows the command header Note that VM700 gt is a prompt which you can change not an input Echo and Rounding Errors Remote Commands execute application You can use the following VM 700T remote commands with the Echo and Rounding Errors option The execute command starts the specified VM 700T application An application is one of the executable files with exceptions noted below found in the Instrument Operations VM 700 Diagnostics Video Measurements or Audio Measurements directories in the Executable Files directory Selecting an operational mode application such as Vector is equivalent to pressing the front panel button the LED on the selected button is lit Selecting a measurement or diagnostic application is equivalent to touching the desired soft key Example VM700T gt execute Rounding Err
7. 8 Cursors 2 7 ITS Search 2 8 Rescale 2 8 menu 2 7 Special Position submenu Bar Left 2 10 Bar Right 2 10 Bar Top 2 9 Exit 2 10 Ref bI 2 10 Set Default 2 9 RS 232C port remote operations 3 1 S second graticule Curve 2 2 1 set VM700T Command 3 4 Set Default soft key 2 5 2 8 2 9 Set Default submenu Set Default 2 9 set key words list 3 5 show VM700T Command 3 4 soft key VM700T Command 3 4 soft keys V Phase Only 2 4 2 9 V Phase Only 2 4 2 9 Accept Input 1 5 1 8 Acquire 2 3 2 8 Average Num 2 2 2 7 Bar Left 2 10 Bar Right 2 10 Bar Top 2 9 Cancel 1 5 Change Display 2 8 Configure Files 1 2 Copy 3 1 Cursor 1 2 4 2 8 Cursor 2 2 4 2 8 Cursors 2 2 2 7 Cursors On 2 4 2 8 Curve 2 dB 2 4 Curve 2 ON OFF 2 4 Delete 1 5 Diff 2 4 Done 1 4 Echo Rounding 1 3 Exit 2 5 2 10 Function 3 1 Grats 2 3 ITS Search 2 8 Leave Directory 1 5 Log 3 1 No Change amp Exit 1 5 1 7 1 8 Pulse Pos Default 2 5 Ref bI 2 10 Report 3 1 Rescale 2 3 2 8 Set Default 2 5 2 8 2 9 Source Selection Video 1 8 Special Position 2 4 2 8 System Default 1 3 Update amp Exit 1 5 1 8 Source Selection Video configuring 1 8 Source Selection Video file 1 1 Special Position soft key 2 4 2 8 Special Position submenu Bar Left 2 10 Bar Right 2 10 Bar Top 2 9 Exit 2 5 2 10 Pulse Pos Default 2
8. Video 1 8 Video Source files 1 6 Copy soft key 3 1 cursor dashed line moving 2 8 enabling disabling 2 8 solid line moving 2 8 Cursor 1 soft key 2 4 2 8 Cursor 2 soft key 2 4 2 8 Cursors On soft key 2 4 2 8 Cursors soft key 2 2 2 7 Cursors submenu Cursor 1 2 4 2 8 Cursor 2 2 4 2 8 Cursors On 2 4 2 8 Set Default 2 8 Curve 2 dB soft key 24 Curve 2 ON OFF soft key 2 4 Curve 2 graticule 2 1 D delete Echo Rounding Limit file 1 5 Delete soft key 1 5 Diff soft key 2 4 display expansion factor setting 2 8 display Echo 2 1 Done soft key 1 4 E Echo Acquire submenu V Phase Only 2 4 V Phase Only 2 4 Special Position 2 4 Cursors submenu Cursor 1 2 4 Cursor 2 2 4 Cursors On 2 4 Diff 2 4 display explained 2 1 Grats submenu Curve 2 dB 2 4 Curve 2 ON OFF 2 4 Main menu Acquire 2 3 Average Num 2 2 VM700T Option 1G Echo and Rounding Errors Measurements User Manual Index 1 Index Cursors 2 2 Grats 2 3 Rescale 2 3 Special Position submenu Exit 2 5 Pulse Pos Default 2 5 Set Default 2 5 Echo and Rounding Limit file 1 1 Echo button 2 2 Echo Rounding limit file changing 1 3 1 5 configuring 1 3 deleting 1 5 Echo_Rounding soft key 1 3 execute VM700T Command 3 2 Exit soft key 2 5 2 10 F filename specifying 1 3 files deleting 1 5 Echo and Rounding limit 1 1 Echo Rounding limit changing 1 3 Source S
9. a full pathname or a path relative to the Measurement Results directory Example VM700T gt show nvram0 ConfigFiles Source Selection Video Video NTSC Video Source File Name PAL Video Source File Name Source A NTSC System Default System Default Source B PAL System Default System Default Source C NTSC System Default System Default Timed Events System Default The softkey soft key used as one word command indicates the press and release of a specified soft key such as Cursors The softkey command is equivalent to entering softpress and softrelease however in general the softkey command should be used instead of these commands VM700T Option 1G Echo and Rounding Errors Measurements User Manual Remote Commands and Keywords Example VM700T gt softkey Select Graph The general rule for forming a softkey_name is to take the spelling and capital ization from the soft key name on the display omit the variable part and join the words with _ underscore For example the softkey_name for the Noise 15 03 dB soft key is Noise dB and for 1H Display it is H Display For soft keys that perform toggle operations such as on off the soft key name is followed by a colon For example Plot ON or Freq LINEAR The soft key displays the current status of the toggle To name toggle keys use the function name with appropriate capitalization up to but not including the colon Get and Set Keywords The Echo a
10. adjusts the level of curve 2 relative to the fixed graticule curve 1 from 0 dB to 6 dB Curve 2 ON OFF turns curve 2 on or off Acquire Submenu Special Position V Phase Only V Phase Only Special Position displays the Special Position screen Figure 2 3 and provides soft keys to set measurement locations for the Echo measurement V Phase Only PAL measures only the V phase part of the signal V Phase Only PAL measures only the V phase part of the signal 2 4 VM700T Option 1G Echo and Rounding Errors Measurements User Manual Operating Basics Special Position Submenu Set Default Set Default resets the pulse location to its default value found in the Measurement Locations file Figure 2 4 Pulse Pos Pulse Pos defines the pulse location in the signal When this Default soft key is highlighted rotating the knob moves the pulse location Exit Exit leaves the Special Position screen The main Echo screen is displayed Measurement Location for the Echo Measurement Field 1 Line 90 1410 Pulse amp Bar n a 1 i i 1 1 3 i t i 1 10 0 15 0 20 0 25 0 30 0 35 0 40 0 45 0 50 0 55 0 60 0 Set Default Figure 2 4 Echo Special Position display VM700T Option 1G Echo and Rounding Errors Measurements User Manual 2 5 Operating Basics Rounding Errors Rounding Errors measures the rounding of white level and black level at specified times from the 50 point of the leading a
11. insertion test signals for a signal appropriate for the measurement If an appropriate signal is not located the message Not found displays briefly on the screen Rescale sets the display expansion factor to an appropriate scale for the Rounding Errors measurement s display graticule The x and y axes adjust to accommodate the rescaled display Cursors Submenu Set Default Cursor 1 Cursor 2 Cursors On Set Default resets the selected soft key either Cursor 1 or Cursor 2 to its default location If neither is currently selected both are reset Cursor 1 defaults to 0 4 usec and Cursor 2 defaults to 1 0 usec after the 5096 crossing point of the rising or falling edge Cursor 1 defines one of the two locations that determine the voltage levels and calculate the Rounding of the Black and White A dashed vertical line in the graph represents cursor location To move the cursor highlight this soft key and rotate the knob Cursor 2 defines one of the two locations that determine the voltage levels and calculate the Rounding of the Black and White A solid vertical line in the graph represents the cursor location To move the cursor highlight this soft key and rotate the knob Cursors On enables disables the cursors for use in the Rounding Errors measurement Acquire Submenu Special Position Special Position displays the Special Position screen see Figure 2 7 and the Special Position submenu which provides soft
12. used instead of these commands Example VM700T gt hardkey Menu Front panel button names are listed in Table 3 2 Table 3 2 Front Panel Button Names A Display Picture Auto Freeze SelectLine Average Graticule Vector VM700T Option 1G Echo and Rounding Errors Measurements User Manual 3 3 Remote Commands and Keywords 3 4 set keyword channel letter value1 value2 show filename softkey softkey name Table 3 2 Front Panel Button Names Cont B Help Waveform C Menu XY Arrow selector Copy MoveExpand NOTE The Configure Function and Measure buttons cannot be selected via remote The set command defines configuration values to use during the remote session Table 3 3 list the keywords available to use with set The channel letter can be A B or C The configuration values changed with set remain in effect until restored to their original pre remote values with the restoreconfig command or power to the instrument is switched off and back on System line and other global variables can be changed with set but are not restored with the restore config command Example VM700T set IROB A 1 5 1 5 The above example changes changes the PAL rounding of black limits for channel A from their previous values to 1 5 to 1 5 percent The show command returns the contents of the specified filename The default path is the Measurement Results directory but other files can be specified with
13. 5 Ref bI 2 10 Set Default 2 5 System Default soft key 1 3 T template using existing file 1 3 terminal program 3 1 U Update amp Exit soft key 1 5 1 8 V V Phase Only soft keys V 2 4 Video Limit file creating 1 3 parameters changing 1 3 1 5 Video Source file 1 1 configuring 1 6 editing 1 6 specifying 1 8 VM700T Option 1G Echo and Rounding Errors Measurements User Manual Index 3 Index Video Source file changing 1 6 show 3 4 VM700 prompt 3 2 soft key 3 4 VM700T Commands execute 3 2 VMT remote applications 3 1 VM700T commands get 3 3 getresults 3 3 W hard key 3 3 DORS sigs set 3 4 weighting factor specifying 2 7 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
14. List of Tables Table 3 1 VM 700T Remote Control Commands Format 3 2 Table 3 2 Front Panel Button Names 02 eee 3 3 Table 3 3 Keywords for get and set commands 0 0 eee eee 3 5 ii VM700T Option 1G Echo and Rounding Errors Measurements User Manual UAR Preface The VM700T Video Measurement Set Option 1G 2T Echo and Rounding of Black amp White gives you access to two measurements named Echo and Rounding Errors respectively Echo determines whether or not a signal has too many echoes Rounding Errors measures rounding of the black and white signal levels The Echo and Rounding Errors soft keys display in the Measure Mode Video Options directory window when Option 1G is installed in your VM 700T To view the Video Options directory window press the Measure button on the front panel If the VM 700T 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 The manual contents are arranged as in the following order Configuring the Option describes how to configure the Echo and Rounding Errors Measurement option of the VM 700T Video Measurement Set Operating Basics provides information on using the two measurements available with the VM 700T Option 1G Echo and Rounding Errors The Echo measure ment determines subjectively
15. Test Equipment Depot User Manual 1 800 517 8431 Tektronix PA 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 SSS SSS eee Table of Contents Preface 4 22 REA bESURS DETUR OER ECR TRE iii Configuring the Option Configuring the Echo Rounding Limits Files leeleeeeeeese 1 3 Create a Video Limit File for Echo Rounding 1 3 Editing an Echo Rounding Limit Text Parameter 0 1 5 Deleting a Modified Echo Rounding Limit File 1 5 Configuring the Video Source Files 2 0 00 cee cece eee eee 1 6 Editing the Video Source File 0 00 c eee ee 1 6 Changing the Video Source Parameters 00000 cece eee 1 7 Configuring the Source Selection Video Files 0 0 00 000 ee eee 1 8 Specifying a Video Source File 0 0 0 eee 1 8 Operating Basics Echon Leorsemt S Au 9 DU a PERRO II FEA HE Pe Ea E NES 2 1 Echo Menu EE DUNG Sate Rie UR E Boe eS 2 2 Rounding Errors 2 1 0 ccc ec ete eee e tenet hm n 2 6 Rounding Errors Menu 00 0 A eee ees 2 7 Remote Commands and Keywords Command Format emer ert Bee ee A Gee pee tle Mes 3 2 Echo and Rounding Errors Remote Commands 00 eee ee 3 2 execute application sisri ereenn e cent eee
16. Video Source Files directory The Video Source files are displayed Touching a soft key displays the parameters in a file these parameters cannot be changed To modify file parameters you must do the following W create a file W select the existing file to use as a template m name the file you created m edit the information in the new file as needed m accept the edits W save the changes If the system default video source file is acceptable the VM 700T uses this file as it performs video measurements To change the Video Source file complete the steps described in the following procedure Editing the Video To modify the Video Source file Source File 1 Touch the Create File soft key see Figure 1 6 The query line the top line of the display asks you to select the file to use as a template for your new file 2 Touch the appropriate soft key for the file you want to use for example System Default A keyboard displays as shown previously in Figure 1 4 3 Type the name for your new file 4 Touch the Done key The VM700T displays the contents of the new file that contains the Video Source data from the file you selected as the template You can modify parameters in this file 1 6 VM700T Option 1G Echo and Rounding Errors Measurements User Manual Configuring the Option NewSource System Default NTSC Files In nvram ConfigFiles Video Source Files NTSC Delete S
17. and the Bar Top level With this soft key highlighted rotate the knob to move the Bar Reference position Bar Left Bar Left defines the location of the leading edge of Bar represented by an arrow in the graph With this soft key highlighted rotate the knob to move the Bar Left position Bar Right Bar Right defines the location of the trailing edge of Bar represented by an arrow in the graph With this soft key highlighted rotate the knob to move the Bar Right position Exit 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 Remote Commands and Keywords D 4 Remote Commands and Keywords You may use the serial RS 232C ports on the VM700T Video Measurement Set rear panel to remotely control the Echo and Rounding Errors functions To use the remote control functions you connect a terminal or computer to the VM700T at the RS 232C port with a correctly wired interconnect cable With a computer you also need a suitable VM 700T terminal program such as the Tektronix VM Terminal VMT control software package The VMT program offers a choice of either menu selection or command line entry of VM 700 VM700A and VM 700T remote commands See the VM 700T RS 232 Interface Programmer Manual for information about configuring the VM 700T serial ports for remote operation The programmer manual discusses the RS 232C port requirements
18. ce Selection Video directory and cancel any changes VM700T Option 1G Echo and Rounding Errors Measurements User Manual E SSS Operating Basics E Operating Basics Echo 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 The Echo display Figure 2 1 plots the signal level as a percentage of the top of pulse level The display also shows the measurement name 2T Pulse Echo the waveform type and the field for NTSC and line number of the measured signal The Curve 2 soft key displays a second graticule Figure 2 2 This graticule is a fraction of Curve 1 the main graticule The ratio of Curve 2 to Curve 1 can be selected and it is expressed in dB relative to Curve 1 Echoes in the signal that are under Curve 2 are therefore below Curve 1 by at least the specified number of decibels Figure 2 2 shows a typical Echo display with the Curve 2 graticule 2T Pulse Echo Wim gt 1410 Pulse amp Bar Field 1 Line 90 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 u sec Average Off Figure 2 1 Echo display VM700T Option 1G Echo and Rounding Errors Measurements User Manual 2 1 Operating Basics
19. election Video 1 1 Video Limit file creating 1 3 Video Limit changing 1 3 Video Source 1 1 Video Source changing 1 6 1 7 format commands 3 2 Function button 3 4 soft key 3 1 G get VM700T Command 3 3 get keywords list 3 5 getresults VM700T Command 3 3 Grats soft key 2 3 Grats Submenu Curve 2 dB 2 4 Curve 2 ON OFF 2 4 H hard key VM700T Command 3 3 ITS Search soft key 2 8 Index 2 K keywords list 3 5 L Leave Directory soft key 1 5 Log soft key 3 1 M measurement locations setting 2 8 Menu button 2 7 menus Echo 2 2 Acquire 2 4 Cursors 2 4 Grats 2 4 Main 2 2 Special Position 2 5 Rounding Errors 2 7 Acquire 2 8 Cursors 2 8 Main 2 7 Special Position 2 9 N name list front panel buttons 3 3 naming files 1 3 No Change amp Exit soft key 1 5 1 7 1 8 P parameters changing Video Source file 1 7 prompt VM700 3 2 Pulse Pos Default soft key 2 5 R Ref bl soft key 2 10 Remote Control GPIB Interface 3 1 remote control command format 3 2 Report soft key 3 1 Rescale soft key 2 3 2 8 Rounding Errors Acquire submenu V Phase Only 2 9 V Phase Only 2 9 Special Position 2 8 VM700T Option 1G Echo and Rounding Errors Measurements User Manual Index Cursors submenu Cursor 1 2 8 Cursor 2 2 8 Cursors On 2 8 Set Default 2 8 defined 2 6 Main menu Acquire 2 8 Average Num 2 7 Change Display 2
20. eo 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 You can select a Video Source file from the Source Selection Video if you intend to use a source file other than the system default for each of three sources To specify a video source file Rotate the front panel knob until Source Selection Video displays 2 Touch the Source Selection Video soft key The Source Selection Video file displays 3 Rotate the front panel knob to highlight the source for which you are specifying a Video Source file source A B or C 4 Touch the highlighted source file to select it A box highlights the selected file 5 Rotate the front panel knob to change the Video Source file selection 6 Touch the Accept Input soft key The highlight box disappears and the new source displays 7 Touch the Update amp Exit soft key if the change is correct The ConfigFiles menu displays If the change is not correct touch the No change amp Exit soft key NOTE If you change the Video Source file and do not want to save the change touch the Accept Input soft key then touch the No change amp Exit soft key The VM 700T asks you to touch the No Change amp Exit soft key to verify that you want to exit the Sour
21. he change touch the No Change amp Exit soft key The VM 700T asks you to touch the No Change amp Exit soft key again to verify that you want to exit without changing anything To display the file you created touch its soft key When making extensive changes to a file avoid losing changes by touching the Update amp Exit soft key after each change then re entering the file That way if you make a mistake and must exit the file earlier work is retained while the most recent change or mistake is eliminated Deleting a Modified Echo To delete a modified Echo Rounding limit file Rounding Limit File e od 1 Touch the Delete soft key in the Echo Rounding files directory The query line the top line of the display asks you to select a file to delete 2 Touch the soft key of the file to delete The file is deleted when its soft key completely disappears from the screen NOTE Touch the Cancel soft key replaces the Delete soft key when deletion begins to halt the deletion process You can also halt file deletion by touching the file soft key 3 Touch the Leave Directory soft key to return to the Configure menu VM700T Option 1G Echo and Rounding Errors Measurements User Manual 1 5 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com Configuring the Option Configuring the Video Source Files Touch the Video Source files soft key to enter the
22. keys to set the measurement locations for the Rounding Errors measurement 2 8 VM700T Option 1G Echo and Rounding Errors Measurements User Manual Operating Basics V Phase V Phase Only PAL measures only the V phase part of the Only signal V Phase V Phase Only PAL measures only the V phase part of the Only signal Measurement Location for the Rounding Errors Measurement Line 19 tl i t i i i i i i i i i sec 10 0 15 0 20 0 25 0 30 0 35 0 40 0 45 0 50 0 55 0 60 0 E Set Bar Top Ref b1 Bar Left Bar Right Exit Default 36 8uSec 54 6uSec 24 0uSec 49 7uSec Figure 2 7 Rounding Errors Special Position display Special Position Submenu Set Default Set Default resets the selected soft key Bar Top Ref bl Bar Left or Bar Right to its default location If none are currently selected all are reset The default locations are specified in the current Measurement Locations file Bar Top Bar Top defines the location of Bar Top shown as a narrow rectangle on the 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 VM700T Option 1G Echo and Rounding Errors Measurements User Manual 2 9 Operating Basics Ref bl Ref b1 defines the location of the Bar Reference repre sented by a narrow rectangle in the graph The Bar amplitude is the difference between the Bar Reference level
23. nd Error Rounding keywords used with the get and set commands are shown in Table 3 3 For each get set keyword the table shows the syntax of the set command and the get result a description of what the keyword does and the upper and lower limits of its range Table 3 3 Keywords for get and set commands Keyword Description Range HROB NTSC Rounding of black 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 VM700T Option 1G Echo and Rounding Errors Measurements User Manual 3 5 Index Index Symbols V Phase Only soft keys V 2 9 V Phase Only soft keys V 2 4 2 9 A Accept Input soft key 1 8 Acquire soft key 2 3 2 8 Acquire submenu V Phase Only 2 4 2 9 V Phase Only 2 4 2 9 Special Position 2 4 2 8 Average Num soft key 2 2 2 7 B Bar Left soft key 2 10 Bar Right soft key 2 10 Bar Top soft key 2 9 buttons Configure 1 1 3 4 Echo 2 2 Function 3 4 Measure 3 4 Menu 2 7 names front panel 3 3 C Cancel soft key 1 5 Change Display soft key 2 8 changing Video Source file 1 6 1 7 command format 3 2 commands get 3 3 getresults 3 3 hard key 3 3 set 3 4 show 3 4 soft key 3 4 configuration begin 1 1 steps 1 1 Configure button 1 1 3 4 Configure Files soft key 1 2 configuring Echo Rounding limit file 1 3 Source Selection
24. nd trailing edge of Bar The Rounding Errors display Figure 2 5 plots signal level as a percentage between the reference level 0 and the bar level 100 Text read outs on the display show W measurement name Rounding Errors m standard of the measurement signal NTSC or PAL m waveform type m field for NTSC and line number of the measured signal m time period over which the measurement is taken W percentage of rounding of white black or both depending on the display setup that can be controlled by menu soft keys The Rounding Errors measurement uses a bar signal Rounding Errors PAL Wfm gt Pulse Line 19 0 Ref Level 100 Bar Level 110 0 V From 0 40 uS to 1 00 uS 03 Rounding of White 0 1 Rounding of Black 0 1 20 0 Manual Positioning Bar Left at 24 0 uSec Bar Right at 49 7 uSec Average Off Displaying Rising Edge and Falling Edge 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 Operating Basics Rounding Errors Menu Figure 2 6 shows the Rounding Errors menu tree structure Pressing the Menu button when the Rounding Errors measurement runs displays the Rounding Errors main menu
25. of the VM 700T in detail and shows typical cable wiring configurations You may also control the VM 700T remotely using the optional GPIB interface The command set is the same for the VM 700T 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 VM 700T Refer to the VM 700T Option 48 GPIB Interface Programmer Manual for instructions on using the GPIB interface for remote control When operating the VM 700T from a remote location you can do the following m Make a specific manual measurement or Auto mode series of measurements W Execute and interrupt a function Function key m Temporarily change the configuration of a channel limit files selected measurement files and measurement location files printer type and port for each output type Copy Report Log specify an End of File character for printer output The remote commands that access the Echo and Rounding Errors functions are the same as those used for other VM 700T functions The command arguments are listed and described below The information in this section assumes that you are familiar with VM 700T manual operation and principles of remote VM 700T operation For information on working with VM 700T remote control commands see the VM 700T RS 232 Interface Programmer Manual For the GPIB Option refer to the VM 700T Option 48 GPIB Interface Programmer Manual
26. ors VM700T Option 1G Echo and Rounding Errors Measurements User Manual Remote Commands and Keywords You can run these Echo and Rounding Errors applications under remote control Be sure to use the same capitalization and tildes as shown Echo Rounding Errors get keyword The get command returns the configuration file value specified by keyword on channel letter the channel specified by channel letter The keywords available are listed in Table 3 3 on page 3 5 The channel letters available are A B or C Example VM700T get HROB A The above example returns the rounding of black as a percent value for channel A getresults The getresults command stores Measure or Auto mode measurement results in default files in the Measurement Results directory In Measure mode entering getresults with no argument s stores measurement results for the current measurement If the system is not taking a measurement the message Request not supported displays If the system is making a measurement the message Results in file filename displays Use the show filename command to view the results Example VM700T getresults Results in file Bowtie hardkey button name The hardkey command hard key used as one word indicates the press and release of the specified front panel button button name Using the hardkey command is equivalent to entering hardpress and hardrelease however in general the hardkey command should be
27. teens 3 2 get keyword channel letter ccce nas 3 3 Getresults c exce waste AUI reve Wer ene Ete d e 3 3 hardkey button name ssseeeee e 3 3 set keyword channel letter valuel value2 0 00 0c eee eee 3 4 showfilenam e x ess e RR Toa RG RON STRIS E MIR UN RSEN OR RC ROS eh 3 4 softkey softkey name 0 ccc ccc n 3 4 Getand Set Keywords ise cn esee RR UR C ORC RR E RR eA 3 5 Index VM700T Option 1G Echo and Rounding Errors Measurements User Manual i Table of Contents List of Figures Figure 1 1 The VM700T Video Measurement Set Configure menu 1 2 Figure 1 2 Configure menus choices 0 0 0 0 eese 1 2 Figure 1 3 Echo Rounding limit menu choices 00 1 3 Figure 1 4 File naming keyboard 0 0 0 cece eee eee 1 4 Figure 1 5 Creating anew file 0 0 0 0 eee eee eee 1 4 Figure 1 6 Selecting a file to use as a template 0 0 0000 1 7 Figure 2 1 Echo display 0 0 cece cece eee 2 1 Figure 2 2 Echo display the showing Curve 2 graticule 2 2 Figure 2 3 Echo menu tree 0 0 cece eee eee ence 2 3 Figure 2 4 Echo Special Position display 02 0 e eee eee ee eee 2 5 Figure 2 5 Rounding Errors display 0 0 0 c eee eee eee eee ee 2 6 Figure 2 6 Rounding Errors menu tree 0 0 eee eee eee 2 7 Figure 2 7 Rounding Errors Special Position display 2 9
28. text describes the steps needed to configure the VM700T Echo and Rounding Errors option Touch the Echo_ Rounding file soft key to enter the Echo Rounding limit file directory The screen displays the system default file and if any have been created user limit files see Figure 1 3 Touching a soft key displays the parameters in any file parameters in the System Default file cannot be changed If the System Default Echo Rounding limits file is acceptable the VM 700T uses it if it is the selected file to measure input video signals You can modify the Echo Rounding limits from the system defaults Complete the following tasks to modify Echo Rounding limit file parameters System Default NTSC Files In nvram ConfigFiles Echo Rounding NTSC Delete Switch Create Rename Print Leave NTSC PAL File File Directory Figure 1 3 Echo Rounding limit menu choices Create a Video Limit File 1 Touch the Create File soft key The query line the top line of the display for Echo Rounding asks you to select a file to use as a template for your new file 2 Touch the soft key of the desired file for example System Default 3 Type a name for your new file on the keyboard that displays see Figure 1 4 VM700T Option 1G Echo and Rounding Errors Measurements User Manual Configuring the Option Please enter file name max 31 characters
29. 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 Remote Commands and Keywords describes the remote commands and keywords that are added to perform the option measurements and get measurement results Abbreviated instructions for operating the instrument using remote control are also found in this section For complete information about remote control see the VM 700T RS 232 Interface Programmer Manual VM700T Option 1G Echo and Rounding Errors Measurements User Manual iii Configuring the Option EE eee Configuring the Option The VM700T Video Measurement Set Option 1G 2T Echo and Rounding of Black amp White gives you access to two measurements named Echo and Rounding Errors respectively Echo determines whether or not a signal has too many echoes Rounding Errors measures rounding of the black and white signal levels The Echo and Rounding Errors soft keys display in the Measure Mode Video Options directory window when Option 1G is installed in your VM 700T To view the Video Options directory window press the Measure button on the front panel If the VM 700T 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
30. witch Create Rename Print Leave NTSC PAL File File Directory Figure 1 6 Selecting a file to use as a template Changing the Video To change the Video Source parameters Source Parameters insert Rotate the knob to highlight the line that contains the parameter you want to change in this case highlight the line Echo and Rounding System Default 2 Touch the desired parameter for example touch Echo and Rounding System Default A box highlights the selected parameter 3 Rotate the knob to change the parameter or value select the name of the new Video Source file 4 Touchthe Accept Input soft key to accept the change The highlight box disappears and the new parameter displays 5 Touch the Update amp Exit soft key to save the change and return to the Video Source Files menu NOTE If you change a parameter and do not want to save the change touch the No Change amp Exit soft key The VM 700T asks you to touch the No Change amp Exit soft key again to verify that you want to exit without changing anything For more information about the other selections in the Video Source file see the User manual for your NTSC PAL or dual standard VM 700T Video Measure ment Set VM700T Option 1G Echo and Rounding Errors Measurements User Manual 1 7 Configuring the Option Configuring the Source Selection Video Files Specifying a Video Source File 1 8 The Vid
31. xxxxx Xxxx Option 01 NTSC Option 11 Option 40 Audio Option 30 Component Option 20 Teletext Version Version Version PAL 2 09 2 09 1 05 Version Version 1 01 1 01 Option 1G Echo Rounding Version 1 00 Option 21 Camera Testing Version 1 02 i Functi ti Time Configure unction Option Files Keys Key Figure 1 1 The VM700T Video Measurement Set Configure menu free 95 2 Touch the Configure Files soft key to display the directories and files for configuration The screen displays these directories and files in a window as shown in Figure 1 2 You can view all the menu choices by turning the front panel knob to scroll the choices up and down in the window Audio_Limit Audio_Source Audio Source Files Files Identification E e Auto Limit Camera Communi cation Files Testing Setup C Diagnostics Diagnostic omponent Selection Errors Echo Rounding Measure umit Measurement Files Locations m NTSC Files In nvram ConfigFiles Switch Print Leave NTSC PAL File Directory Figure 1 2 Configure menus choices VM700T Option 1G Echo and Rounding Errors Measurements User Manual Configuring the Option Configuring the Echo Rounding Limits Files The following
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