Tektronix VM700T Manuale utente

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

VM700T Option 1G Echo and Rounding Errors Measurements User Manual i

Table of Contents

Preface iii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Configuring the Option

Configuring the Echo Rounding Limits Files 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . .

Create a Video Limit File for Echo Rounding 1–3. . . . . . . . . . . . . . . . . . . . . . .

Editing an Echo Rounding Limit Text Parameter 1–5. . . . . . . . . . . . . . . . . . . . .

Deleting a Modified Echo Rounding Limit File 1–5. . . . . . . . . . . . . . . . . . . . . .

Configuring the Video Source Files 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Editing the Video Source File 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Changing the Video Source Parameters 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Configuring the Source Selection Video Files 1–8. . . . . . . . . . . . . . . . . . . . . . . . . . .

Specifying a Video Source File 1–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Basics

Echo 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Echo Menu 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rounding Errors 2–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rounding Errors Menu 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Remote Commands and Keywords

Command Format 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Echo and Rounding Errors Remote Commands 3–2. . . . . . . . . . . . . . . . . . . . . . . . .

execute application 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

get keyword [channel-letter] 3–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

getresults 3–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

hardkey button_name 3–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

set keyword [channel_letter] value1 [value2 ...] 3–4. . . . . . . . . . . . . . . . . . . . .

show filename 3–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

softkey softkey_name 3–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Get and Set Keywords 3–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Index

Table of Contents

ii VM700T Option 1G Echo and Rounding Errors Measurements User Manual

List of Figures

Figure 1–1: The VM700T Video Measurement Set Configure menu 1–2. . . . . . . . .

Figure 1–2: Configure menus choices 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 1–3: Echo_Rounding limit menu choices 1–3. . . . . . . . . . . . . . . . . . . . . . . . .

Figure 1–4: File naming keyboard 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 1–5: Creating a new file 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 1–6: Selecting a file to use as a template 1–7. . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–1: Echo display 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–2: Echo display the showing Curve 2 graticule 2–2. . . . . . . . . . . . . . . . . .

Figure 2–3: Echo menu tree 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–4: Echo Special Position display 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–5: Rounding Errors display 2–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–6: Rounding Errors menu tree 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–7: Rounding Errors Special Position display 2–9. . . . . . . . . . . . . . . . . . . .

List of Tables

Table 3–1: VM700T Remote Control Commands Format 3–2. . . . . . . . . . . . . . . . .

Table 3–2: Front Panel Button Names 3–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 3–3: Keywords: for get and set commands 3–5. . . . . . . . . . . . . . . . . . . . . . . .

VM700T Option 1G Echo and Rounding Errors Measurements User Manual iii

Preface

The VM700T Video Measurement Set Option 1G (2T Echo and Rounding of

Black & 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 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.

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 VM700T Video Measurement Set.

Operating Basics provides information on using the two measurements available

with the VM700T Option 1G, Echo and Rounding Errors. The Echo measure-

ment 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.

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 VM700T RS-232 Interface Programmer Manual.

Configuring the Option

VM700T Option 1G Echo and Rounding Errors Measurements User Manual 1–1

Configuring the Option

The VM700T Video Measurement Set Option 1G (2T Echo and Rounding of

Black & 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  and   soft keys display in the Measure Mode Video

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.

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 VM700T uses to measure video signals. If

your application requires parameters other than the defaults supplied with the

VM700T, 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:

Create your own Echo and Rounding limits file (for example, )

and configure it with your limits.

Create your own Video Source file (for example, ) and select

Test_Set1 (the new limits file you create) as the limits file to use.

Configure the Source_Selection Video file to select the  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.

Configuring the Option

1–2 VM700T Option 1G Echo and Rounding Errors Measurements User Manual

Non volatile memory: used 52416 bytes, free 995904 bytes

used

free

95%

Mā700T ideo Measurement Set xxxxxxĆxxxx

Option 01 NTSC ersion 2.09

Option 11 PAL ersion 2.09

Option 40 Audio ersion 1.05

Option 30 Component ersion 1.01

Option 20 Teletext ersion 1.01

Option 1G Echo/Rounding ersion 1.00

Option 21 Camera Testing ersion 1.02

Keys

Time Configure

Files

Function

Key

Option

Figure 1–1: The VM700T Video Measurement Set Configure menu

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.

ÏÏÏÏÏÏ

ÏÏÏÏÏ

ÏÏÏÏÏÏ

ÏÏÏÏÏ

ÏÏÏÏÏÏ

ÏÏÏÏÏ

ÏÏÏÏÏÏ

ÏÏÏÏÏ

ÏÏÏÏÏÏ

ÏÏÏÏÏ

ÏÏÏÏÏÏ

ÏÏÏÏÏ

ÏÏÏÏÏÏ

ÏÏÏÏÏ

ÏÏÏÏÏÏ

ÏÏÏÏÏ

ÏÏÏÏÏÏ

ÏÏÏÏÏ

Audio_Limit

Files

Switch

NTSC/PAL

File

Leave

Directory

In /nvramØ/ConfigFiles/Echo~Rounding/NTSC

NTSC Files

Switch

NTSC/PAL Rename

Create

File

ÏÏÏÏÏÏ

Test_Set1

Figure 1–5: Creating a new file

Configuring the Option

VM700T Option 1G Echo and Rounding Errors Measurements User Manual 1–5

To change any Echo Rounding limit text parameter:

1. 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 the change, touch the

No Change & Exit soft key. The VM700T asks you to touch the No Change &

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 & 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.

To delete a modified Echo Rounding limit file:

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.

Editing an Echo Rounding

Limit Text Parameter

Deleting a Modified Echo

Rounding Limit File

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - FAX 781.665.0780 - TestEquipmentDepot.com

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