VTG 400D/400 DVI Programmable Video and Audio Test Generator 68-786-01 Rev.
Precautions Safety Instructions • English Warning This symbol is intended to alert the user of important operating and maintenance (servicing) instructions in the literature provided with the equipment. Power sources • This equipment should be operated only from the power source indicated on the product. This equipment is intended to be used with a main power system with a grounded (neutral) conductor. The third (grounding) pin is a safety feature, do not attempt to bypass or disable it.
FCC Class A Notice N This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications.
Table of Contents Chapter 1 • Introduction ...................................................................................................... 1-1 About this Manual ............................................................................................................ 1-2 About the VTG 400D/400 DVI ...................................................................................... 1-2 Other Features ..................................................................................................
Table of Contents, cont’d Autosequence Mode ................................................................................................... 2-15 Autosequence Interval ................................................................................................ 2-15 Video Setup submenu (4 of 4) .......................................................................................... 2-15 RGB Color Channel Enable .........................................................................................
Test Patterns screen .......................................................................................................... 3-21 Settings screen .................................................................................................................. 3-22 Audio tab ......................................................................................................................... 3-23 Scope-Trigger tab .......................................................................................
Table of Contents, cont’d Multiburst ................................................................................................................ A-16 24. Alternating Pixels (2-dimensional) ........................................................................ A-17 Multipulse ................................................................................................................ A-17 NTSC Multipulse ...............................................................................................
VTG 400D/400 DVI 1 Chapter One Introduction About this Manual About the VTG 400D/400 DVI Other Features
Introduction About this Manual This manual discusses how to set up and operate the Extron VTG 400D/400 DVI programmable video test generator. Throughout this manual the terms “VTG”, “video test generator”, and “VTG 400D/400 DVI” are used interchangeably to refer to the same products.
VTG 400D/400 DVI 2 Chapter Two Installation and Operation Application Example Tabletop or Desktop Placement Rear Panel Connectors and Cabling Connecting Audio Outputs Top Panel Features Audio Testing Features Menus, Configuration, and Adjustments Additional Functions
Installation and Operation Application Example The illustration below is one example of implementing the VTG 400D. Extron 15 pin HD VGA Cable COMPOSITE 100-240V 0.3A 50-60Hz R R-Y S-VIDEO B G B-Y Y V H/HV TRIGGER RGB SDI/HDSDI RS-232 1 3 2 LISTED 1T23 I.T.E. AUDIO VTG 400 PROGRAMMABLE VIDEO TEST GENERATOR AUDIO VIDEO SIGNAL TYPE TEST PATTERN A/V SETUP: Audio Level Units dBu dBV mV Freq. Sweep Speed: 1.
Rear Panel Connectors and Cabling 4 100-240V 0.3A 50-60Hz 1 R G B COMPOSITE S-VIDEO 2 3 R-Y 7 H/HV Y 8a V AUDIO LISTED 1T23 I.T.E. B-Y 5 RS-232 SDI/HDSDI RGB TRIGGER 6 9 2 1 3 10 11 12 VTG 400D rear panel connectors 4 100-240V 0.3A R G B 7 H/HV 8b V RS-232 50-60Hz 1 COMPOSITE S-VIDEO 2 3 R-Y Y AUDIO DVI-D B-Y 5 LISTED 1T23 I.T.E.
Installation and Operation 5 R-Y, Y, B-Y component video output connectors — Connect a display device to the three female BNC connectors for component video output: R-Y Y B-Y Component video output (R-Y, Y, B-Y) 6 15-pin RGB output connector — RGBHV, RGBS, RGsB, and RsGsBs are output through this 15-pin HD connector. 7 RS-232 port — This 9-pin female D connector provides for two-way RS-232 communication.
Connecting Audio Outputs The VTG has three types of audio output connectors: an RCA jack (VTG 400D only), a 3-pin XLR connector, and a 3.5 mm mini stereo phone jack. RCA connector Unbalanced mono audio is output from this connector. Wire the RCA connector as shown here. Tip (+) Sleeve ( ) XLR connector Balanced mono audio is output from this connector. Wire the female XLR connector as shown here.
Installation and Operation, cont’d Top Panel Features 13 VTG 400 VIDEO & AUDIO TEST GENERATOR AUDIO VIDEO SIGNAL TYPE TEST PATTERN 1 2 RES: NTSC 720X485 FRQ:15.70kHz 60/30Hz Checkerboard 100% SIG:Pink noise FRQ:N/A LEV:-18dBu 97.
If the Frequency buttons are held down for more than one second, the VTG automatically advances through the frequency adjustment in the direction indicated by the button. 4 Power — Power up or power down the VTG by holding down the Power button for one second. 5 Menu — Press this button to enter the main menus and to move from menu to menu. 6 Quick Select — Press these buttons to save and recall up to four userdefined presets of current audio settings, video settings, or all settings.
Installation and Operation, cont’d Function Option Icons Cursor movement and option selection — Press the button next to this icon to move the cursor left or select an option at the left of the LCD. — Press the button next to this icon to move the cursor right or select an option at the right of the LCD. — Press the button next to this icon to increment or scroll up to the next selection. — Press the button next to this icon to decrement or scroll down to the previous selection.
An example of the sine burst signal is shown in the following illustration: Burst Frequency = 1 / Cycle Interval = 8 Cycles 1 Cycle Burst On = 5 Cycles Setting the audio level The audio level for each audio signal type is selected from a range of values using the or Level buttons. The following table lists the range of values.
Installation and Operation, cont’d Audio Range 20 Hz 21.2 Hz 22.4 Hz 23.6 Hz 25 Hz 26.5 Hz 28 Hz 30 Hz 31.5 Hz 33.5 Hz 35.5 Hz 37.5 Hz 40 Hz 42.5 Hz 45 Hz 47.
Menu overview The default screen appears on the LCD when the unit is first powered on, as shown here. Power on VTG 400 VIDEO TEST GENERATOR 60-564-01 Ver. 1.00 3 sec. RES: VGA 640x480 FRQ: 31.50kHz 60.00Hz PAT: Fine Crosshatch SIG: Pink noise FRQ: N/A LEV: -10 dBu 245mV Default menus during initial power up If no top panel buttons are pressed within a 15-second timeout period, the following menu is displayed. Both audio and video information are displayed. RES: VGA 640x480 FRQ: 31.50kHz 60.
Installation and Operation, cont’d If you press the Menu button while a submenu is active, the next main menu becomes active. For example, the menu changes from an Audio Setup submenu (see the following menu) to the Video Setup main menu. Audio Setup menu The following flowchart illustrates the Audio Setup menu system. Pressing the Next button displays the audio setup submenus. RES: VGA 640x480 FRQ: 31.50kHz 60.
Burst on Specify the number of active cycles in each burst (0 through 65,535 cycles). The number of active cycles in a burst must always be less than or equal to the total number of cycles in an interval. Audio Setup submenu (3 of 5) The starting and ending frequencies of the frequency sweep audio test signal are specified from this submenu. F. Sweep Start Freq Specify the frequency sweep start frequency (20.0 Hz through 19.0 kHz). The start frequency can never be set greater than the stop frequency. F.
Installation and Operation, cont’d Video Setup menu The following flowchart describes the Video Setup menu. Power on RES: VGA 640x480 FRQ: 31.50kHz 60.
Res: VESA3 1024x768 FRQ: 48.40 kHz 60.00 Hz Video Setup submenu (3 of 4) Test pattern autosequence mode and autosequence interval are selected from this submenu. Test pattern autosequence mode specifies whether to step through the test patterns in a predetermined sequence. Test pattern autosequence interval specifies how long each test pattern in the autosequence mode will be displayed. The predetermined sequence of test patterns is specified via RS-232 commands or the Windows-based control program.
Installation and Operation, cont’d Color Combinations Black Blue Green Cyan Red Magenta Yellow White R G B off off off off on on on on off off on on off off on on off on off on off on off on Advanced Setup menu The following flowchart describes the Advanced Setup menu. Power on RES: VGA 640x480 FRQ: 31.50kHz 60.
• 5 minutes • 10 minutes • 15 minutes • 30 minutes • Never time out (default — screensaver is not activated) The following LCD display message is updated approximately every 38 seconds starting with the timeout interval selected. Time-out in: 00:18 minutes After the timeout interval has has elapsed, the following LCD message is displayed. SCREEN SAVER ACTIVE The timeout timer is reset whenever any VTG button is pressed.
Installation and Operation, cont’d Internal Temperature • -67° to +257°F (-55° to +125°C) Native Rate for DVI Device • The preferred resolution of the device connected to the DVI connector (VTG 400 DVI only). Advanced Setup submenu (4 of 4) The VTG can be reset to default settings from this submenu. System Reset • YES • NO Selecting “YES” displays a confirmation menu. System Reset Confirm • YES • NO Selecting “YES” resets the VTG to factory default settings.
Power on VTG 400 VIDEO TEST GENERATOR 60-564-01 Ver. 1.00 3 sec. RES: VGA 640x480 FRQ: 31.50kHz 60.
Installation and Operation, cont’d Quick select buttons Up to four video and/or audio settings can be saved by pressing one of the four top panel Quick Select buttons for two seconds until the Quick Select Setup menu appears. The following menu flowchart illustrates this process. Power on VTG 400 VIDEO TEST GENERATOR 60-564-01 Ver. 1.00 RES: VGA 640x480 FRQ: 31.50kHz 60.00Hz PAT: Fine Crosshatch SIG: Pink noise FRQ: N/A LEV: -10 dBu 245mV 3 sec.
Video output range and rate buttons Pressing the Video Range button selects from among eight output range categories. Pressing the and Video Rate buttons selects an output rate for the chosen output range. The output rates are displayed two at a time on the LCD. See the following illustration. Power on VTG 400 VIDEO TEST GENERATOR 60-564-01 Ver. 1.00 3 sec. RES: VGA 640x480 FRQ: 31.50kHz 60.
Installation and Operation, cont’d Test pattern selection buttons Depending on the currently selected video rate, pressing the and Video Test Pattern selection buttons selects from up to 28 different video test patterns. The newly selected test pattern displays for three seconds before returning to the previous menu. See the following menu. Refer to the Test Patterns Chart in appendix A for the table of available test patterns and their features. Power on VTG 400 VIDEO TEST GENERATOR 60-564-01 Ver. 1.
The following test patterns have a special feature function using the invert button: • SMPTE Bars — This pattern toggles blue mode on and off. • Bounce (manual toggle) — Toggles the center window on and off. This pattern does not invert the entire pattern. • Contrast transfer function — This test pattern toggles the vertical lines between always on and blinking. Refer to the Test Patterns in Detail section in appendix A of this manual.
Installation and Operation, cont’d Press the Scope Trigger Cursor buttons ( , , , ) to position the oscilloscope’s cursor on a line (y-axis) of video and on a specific pixel (x-axis) of that line. This x-y coodinate location is the trigger point. Use the and buttons to position the cursor along the x-axis, and use the and buttons to position the cursor along the y-axis.
DISPLAY SCREEN vertical sync pulse Total Video Area vertical back porch Note: The gray area alone equals blanking and is not visible on the screen.
Installation and Operation, cont’d 2-26 VTG 400D/400 DVI • Installation and Operation
VTG 400D/400 DVI 3 Chapter Three Serial Communication RS-232 Programmer’s Guide Control Software for Windows® Using the Emulation Mode Firmware Upgrade Through the Extron Web Site
Serial Communication The VTG can be remotely controlled via a host computer or other device (such as a control system) attached to the rear panel RS-232 connector. The control device (host) can use either the Extron Simple Instruction Set (SIS™) commands or the graphical control program for Windows®. The VTG uses a protocol of 9600 baud, 1 stop bit, no parity, and no flow control.
Using the command/response tables The command/response tables in this chapter list valid command ASCII codes, the video test generator’s responses to the host, and a description of the command’s function or the results of executing the command. The ASCII to HEX conversion table below is for use with the command/response tables. ASCII to HEX Conversion Table • The command/response tables use symbols (defined below) to represent variables.
Serial Communication X14 = Audio tone frequency (1 - 121) [20 Hz to 20 kHz in 1/12 octave steps] Audio Range 1 = 20 Hz 2 = 21.2 Hz 3 = 22.4 Hz 4 = 23.6 Hz 5 = 25 Hz 6 = 26.5 Hz 7 = 28 Hz 8 = 30 Hz 9 = 31.5 Hz 10 = 33.5 Hz 11 = 35.5 Hz 12 = 37.5 Hz 13 = 40 Hz 14 = 42.5 Hz 15 = 45 Hz 16 = 47.
X24 = Video scan rate group (1 - 7, 99) 1 = PC (default) 2 = CAD workstations 3 = stereographics 4 = super high resolution 5 = 16:9 high resolution X25 = Scan rate group count (1 through 99) X26 = Scan rate group name (21 characters) X27 = Test pattern count (1 through 99) X28 = Test pattern name (20 characters) X29 = RGB sync format 6 = HDTV 7 = video 99 = custom 1 = RGBHV (default) 2 = RGBS 3 = RGsB 4 = RsGsBs X30 = Firmware partition 1 = factory microcontroller firmware 2 = factory F
Serial Communication, cont’d Command/response table for SIS commands Command ASCII Command Response (host to VTG) Additional description (VTG to host) Power Turn power on 1P/1p Pwr 1 Turn power off 0P/0p Pwr 0 View power status P/p 1 Turn VTG power on. Turn VTG power off. /0 = on/off Show power status.
Command/response table for SIS commands (continued) Command ASCII Command Response (host to VTG) Additional description (VTG to host) List rates All rates L/l By range X24 X4 ... X4 List VTG scan rates (all rates returned). X4 ... X4 List scan rates for range L/ X24 l X24 . Set test pattern Specific pattern X2 Tst X2 Select pattern Increment up +J/+j J/ X2 j Tst X2 Select next higher pattern. X2 . Increment down -J/-j Tst X2 Select next lower pattern.
Serial Communication, cont’d Command/response table for SIS commands (continued) Command ASCII Command Response (host to VTG) View 5# Additional description (VTG to host) View current setting. X15 Set audio level scale Set audio level scale X8 *16# View 16# Scl Set the VTG’s level scale to X8 . View current setting. X8 X8 Set audio output level Set audio level to + value X9 Set audio level to - value X10 G Lev = + X9 Set audio level to + X9 .
Command/response table for SIS commands (continued) Command ASCII Command Response (host to VTG) Additional description (VTG to host) Set frequency sweep direction Set View X38 *25# Sdr 25# Set the frequency sweep direction. X38 View the frequency sweep direction.
Serial Communication, cont’d Command/response table for SIS commands (continued) Command ASCII Command Response (host to VTG) Additional description (VTG to host) Enable/disable patterns for test pattern autosequence mode Enable pattern 1* X2 *17# Pas01* X2 Enable test pattern for autosequence mode. Disable pattern 0* X2 *17# Pas00* X2 Disable test pattern for autosequence mode.
Control Software for Windows The included Extron VTG 400/400D/400 DVI Control Program for Windows offers another way to control the VTG via RS-232 connection in addition to the Simple Instruction Set commands. The control program’s graphical interface includes the same functions as those on the video test generator’s top panel and some additional features that are only available through the Windows-based software. The control software is compatible with Windows 98, Windows NT, Windows 2000, and Windows XP.
Serial Communication, cont’d 3. In the table on the Control Software screen, scroll to locate the VTG 400/400D, and click the Install link in the far right column. 4. On the File Download window that appears, click Run to begin installing the program. If you want to save the installation file (VTG400SW1xn.exe) to your desktop to run later, click Save instead of Run. On the Save As window, save the setup file to the desired location on your PC.
7. When the installation is complete, close the Software products screen. You can now start the Windows-based control program. Downloading the VTG 400 software from the Web The VTG 400 Windows-based control program is also available on the Extron Web site at www.extron.com. From this site, you can also download updates to the VTG 400 software as they become available. To access the software on the Web, 1. Open the Extron Web page, and select the Download tab. 2.
Serial Communication, cont’d Starting the control program Many items found in the VTG 400 Control Program are also accessible via top panel controls and the LCD menus described in chapter 2. Refer to chapter 2 for details on features and settings. The VTG 400 Help Program provides information on settings and on how to use the control program itself. Some features, including the miscellaneous options, are only available via this control program.
Drop-down menus File menu The File menu features six functions: New Connection, Save Configuration, Restore Configuration, Update Firmware, System Reset, and Exit. See the illustration below. • Reselect a COMM port using New Connection. • Save Configuration saves the current configuration settings to a *.vtg file. • Restore Configuration retrieves configuration information from a previously saved *.vtg file. • System Reset resets the VTG to factory default configuration settings.
Serial Communication, cont’d • The Restore Factory Audio Settings command sets all the audio settings to factory default. • The Audio Mute command mutes all audio outputs. Options menu The Options menu features six functions: On Screen Display, Auto-Sequence Mode, Auto Sequence Interval, Raster Border, Screen Saver Mode, and Screen Saver Interval. See the illustration below. • On Screen Display sets the output display on or off.
Add button — Clicking this button allows you to add a new scan rate to the Custom Rates scan group. See the following screen illustration. The Custom Rates scan group is the only group in which scan rates can be added, deleted, or modified. All other scan rate groups remain static, although they can be copied (see the Copy button description later in this chapter.
Serial Communication, cont’d Enter the appropriate information in the above screen, including the horizontal and vertical active video information, rate name and resolution. Select the Apply button to add the new rate. The VTG 400 DVI only outputs custom rates with a pixel clock of less than 165 MHz Click the Print button to print the screen image. The information is sent to Internet Explorer where it can be viewed and printed.
Edit the appropriate information in the above screen. Click the Apply button to save the changes made. Select the Print button to print the screen. Import button — Selecting this button allows you to import scan rates to the Custom Rates scan group. See the following screen display. A previously saved file of defined scan rates must first be opened via the Load File button (see the following Export button description), and a scan rate selected. After selecting the previously saved *.
Serial Communication, cont’d • The Import File Count is the number of rates in the imported file. • The Max. Capacity is the maximum number of Custom rates that theVTG can store. • The Total Selected is the number of rates selected in the imported file. • Used Memory is the number of rates in the Custom Rates folder. • Available Memory is the number of rates that can still be imported to the Custom Rates folder. • Select Load File to select another *.rte file.
Delete button — Click this button to delete an existing scan rate(s) from the Custom Rates folder. Set As Current button — Click this button to set the selected scan rate as the current scan rate. RGB Sync radio buttons — Click one of these radio buttons to select the desired RGB sync: RGBHV, RGBS, RGsB, or RsGsBs. RGB Color Enable check boxes — Click these to enable the desired color(s): Red, Green, or Blue. This affects the RGB outputs only.
Serial Communication, cont’d Auto-Sequence Mode check box — Enables/disables the Auto-sequence mode. Select All Patterns check box — Enables/disables all available test patterns for use in display or Auto-sequence mode. Auto-Sequence Interval drop-down box — Sets the Auto-sequence interval to 15 seconds, 30 seconds, or 1 minute. Invert Pattern button — Inverts (black-to-white/white-to-black) the selected test pattern, if the invert pattern is supported for that pattern.
Screen Saver — Select the Blank radio button to display a black screen. While the screen is blank, the horizontal and vertical sync are still active. Select the Cycle radio button to cycle through valid test patterns for a specific video output (see the Test Patterns Chart in Appendix A. Select the Screen Saver Interval drop down box to set the screen saver timeout interval: 5 minutes, 10 minutes, 15 minutes, 30 minutes, or never time out.
Serial Communication, cont’d Frequency Sweep (Sweep) slider bar — Adjust the slider bar to specify duration of the sweep signal. It is adjusted by moving the slider bar left or right or by selecting the left ( ) or right ( ) arrow buttons to make incremental adjustments to the sweep duration. The frequency sweep format can be logarithmic (more time spent in the lower frequencies) or linear (equal time being spent in the low and high frequencies).
Scope Trigger Window Power/Status button The VTG can be powered on and off by clicking this button. When the button’s status indicates “Power is On”, it can be clicked to toggle the power off and the status then indicates “Power is Off”. When the button’s status indicates “Power is Off”, it can be clicked to toggle the power on, and the status then indicates “Power is On”. Button Lock/Status button The VTG can be placed in top panel security lockout mode by clicking this button.
Serial Communication, cont’d Using the Emulation Mode The VTG 400/400D/400 DVI Control Program features an emulation mode so that you can configure the VTG before actually using it on site. In emulation mode, you can save the emulated settings to a configuration file, then load that configuration file to the VTG. 1. Start the control program. In the Comm Port Selection screen, select Emulation Mode, then click OK. 2.
2b. Alternatively, to edit an existing (previously saved) configuration file, select the appropriate configuration (___.vtg) file. 3. Configure the VTG, as explained earlier in this chapter. 4. Save the configuration by selecting Save Configuration from the File dropdown menu.
Serial Communication, cont’d Firmware Upgrade Through the Extron Web Site The VTG’s firmware is upgraded by going to the Extron Web site, downloading the latest firmware to the PC, then uploading and installing the new firmware from the PC to the VTG via the video test generator’s RS-232 port. Downloading the latest firmware to the PC 1. Go to the Extron Web site (www.extron.com) and select the product category (VTG 400/400D/400 DVI). 2. Select the Support files tab and click on the Firmware link. 3.
VTG 400D/400 DVI A Appendix A Reference Materials Specifications Included Parts Test Patterns Chart Test Patterns in Detail Video Output Scan Rate Table
Appendix Specifications Video signal characteristics Dot clock ....................................... 200 MHz (max.) Pixel clock accuracy ..................... 100 ppm Horizontal frequency range (factory defaults) 15 kHz to 131 kHz Vertical frequency range (factory defaults) 30 Hz to 120 Hz Rise/fall time NTSC, PAL ....................... 140 ns All other signal rates ....... <4 ns Video output Number/signal type ...................
Scope trigger connectors ............. 1 BNC female (scope trigger) Audio THD + Noise ................................ <0.008% typical @ +6 dBu (1.55 V), 1 kHz 0.18% @ -38 dBu (9.75 mV), 20 Hz to 20 kHz Flatness .......................................... ±0.05 dB @ 20 Hz to 20 kHz Accuracy ....................................... ±0.4 dB N 0 dBu = 0.775 Vrms, 0 dBV = 1 Vrms, 0 dBV 2 dBu Audio output Number/signal type VTG 400D ......................... 1 mono, balanced; 2 mono, unbalanced VTG 400 DVI ..
Appendix Enclosure type .............................. Metal Enclosure dimensions ................. 6.75" H x 9.0" W x 1.75" D 17.1 cm H x 22.9 cm W x 4.4 cm D (7.5" [19.1 cm] H including connectors.) Product weight ............................. 3.3 lbs (1.5 kg) Shipping weight .......................... 7 lbs (4 kg) Vibration ....................................... ISTA 1A in carton (International Safe Transit Association) Regulatory compliance Safety ................................. CE, CUL, UL EMI/EMC .
Test Patterns Chart The following chart lists the VTG test patterns and any special features. Test Pattern Range Icon Special Features PC Work- Stereo- Super 16:9 HDTV Video Video Adjustable station graphics Hi Res HR NTSC PAL Levels Invert/ Special No.
Appendix, cont’d Test Pattern Range Icon Special Features PC Work- Stereo- Super 16:9 HDTV Video Video Adjustable Levels station graphics Hi Res HR NTSC PAL No.
Test Pattern No.
Appendix, cont’d Test Patterns in Detail The following test patterns descriptions are helpful in determining how and when the VTG’s array of test patterns can be used. The numbers correspond to the test patterns in the previously described Test Patterns Chart. 1. Circles White circles on a black background are useful for checking overall image geometry and linearity.
4. 16:9 Crop (4:3 rates) This test pattern is used to display the resulting letterbox effect of a widescreen (16:9) image within a standard 4:3 display system. The outer border corresponds to the maximum dimensions of a 4:3 image for the given line rate. The two horizontal lines within the pattern show the area and boundaries of a 16:9 image within a 4:3 space. Use this pattern for setting or creating screen masking systems.
Appendix, cont’d and low frequency response where the perceived brightness of both horizontal and vertical lines should be the same for a system with good frequency response. 8. Fine Crosshatch Crosshatch patterns are traditionally used for linearity and convergence adjustment (both static and dynamic) of CRT-based displays. The fine crosshatch pattern consists of finely spaced lines to create many more intersection regions for finer convergence adjustment, skew adjustment, lens evaluation, and so forth.
are visible. The dimmer of the two is +2%, and the brighter is +4% above black. If either or both of the brighter bars are not visible, the black level is set too low. When the test pattern background is illuminated such that the “blacker-than-black” bar is discernible against the black surround, the black level is set too high. Contrast Gain The group of four illuminated boxes in the center region of the test pattern are used solely for contrast control adjustment.
Appendix, cont’d each step above 100% is just visible ensures that peak video changes and details near white are preserved. Conversely, the shallow ramps near black at the bottom of the pattern show performance near black. The shallow ramp extends downward below black (0%) by eight steps to -5.5% and upward to +5.5% in eight steps. Each step represents a 0.685% change.
The small blue rectangle under the white bar and the small white rectangle under the blue bar are used to indicate proper threshold of the color control level. While viewing the blue bars, adjust the color level control until the perceived brightness of the small rectangles merges with the larger bars to yield one consistent intensity. Now, adjust the tint control by viewing the small rectangles under the cyan and magenta bars.
Appendix, cont’d 15. Window 20% Window patterns provide a low duty cycle white, or near white, reference at screen center for performing grayscale setup without driving the display into a nonlinear operating condition. The 20% gray level of this pattern is a good choice for setup of lowlight values (those gray levels near black) when performing grayscale setup of a display.
19. Checkerboard The checkerboard consists of sixteen rectangles with half being black (0%) and half being white (100%). This pattern is commonly used to measure contrast ratio of the display system and is the prescribed pattern for performing contrast ratio measurement within the ANSI procedure. Fundamentally, contrast ratio is the ratio of the peak white luminance value divided by the minimum luminance value near black.
Appendix, cont’d 22. Alternating Pixels (1 on, 1 off) For computer graphics displays, alternating pixels represent the highest frequency operation at a given line rate, or resolution. These one-On, one-Off transitions tax the speed of a graphics system and the display’s performance as well. Use this pattern to assess the high frequency performance of the display or a graphics system in total. It may also be used to align or evaluate pixel timing and phase on fixed pixel displays.
24. Alternating Pixels (2-dimensional) This pattern is similar to the alternating pixel pattern discussed earlier; however, while it consists of one-On, one-Off alternating pixels on each horizontal line, the phase is shifted 180 degrees for every other line thereby creating a minute checkerboard effect. Because of the line-to-line phase shift, this pattern is useful for critically evaluating pixel timing and phase in a graphics display system.
Appendix, cont’d Phase anomalies of the burst manifest as a wavy appearance at the base of the pulse region. Transmission line quality and length have more proportional effect on the higher frequency pulse/burst combinations. Group delay effects may be combated using a video processing amplifier or an equalizing network at the termination end of the line. PAL Multipulse The 2T pulse is followed by a series of modulated pulses. (1) a 20T pulse encompassing a 1 MHz sine wave burst, (2) a 12.
26. Contrast Transfer Function (CTF) The Contrast Transfer Function (patent pending), or CTF, provides an indication of overall system high frequency response including the display’s optical path. While most high frequency test patterns provide electrical bandwidth performance information when used with appropriate test instruments, evaluation of overall system response, including the optical pathway, is virtually nonexistent.
Appendix, cont’d 28. Hum Bar Detect The Hum Bar Detect pattern assists the user with the location and evaluation of low level ground loop type signal interference. Visual results of induced or conducted low-level AC currents can be difficult to see, depending on image material. This pattern consists of a flat field with three groups of shallow horizontal steps. Each group contains five steps in increments of 2%.
VTG 400D/400 DVI Video Output Scan Rate Table Output Type Pixel x Line Horiz Rate (kHz) Vert Supported Rate Formats (Hz) 640 x 480 640 x 480 800 x 600 800 x 600 800 x 600 1024 x 768 1024 x 768 1024 x 768 1024 x 768 1024 x 768 1152 x 864 1280 x 960 1280 x 960 1280 x 960 1280 x 1024 1280 x 1024 1400 x 1050 1400 x 1050 1600 x 1200 1600 x 1200 1600 x 1200 2048 x 1536 2048 x 1536 1360 x 1024 1365 x 1024 31.5 37.9 35.2 37.9 48.1 48.4 56.4 57 60 68.7 67.5 60 70 75 64 91.1 63.9 65.32 75 87.5 106.3 99.
Appendix, cont’d A-22 VTG 400D/400 DVI • Appendix
Extron’s Warranty Extron Electronics warrants this product against defects in materials and workmanship for a period of three years from the date of purchase.
Extron USA - West Headquarters +800.633.9876 Inside USA / Canada Only +1.714.491.1500 +1.714.491.1517 FAX Extron USA - East Extron Europe Extron Asia Extron Japan Extron China Extron Middle East +800.633.9876 +800.3987.6673 +800.7339.8766 +400.883.1568 Inside USA / Canada Only Inside Europe Only Inside Asia Only +81.3.3511.7655 +81.3.3511.7656 FAX +971.4.2991800 +971.4.2991880 FAX +1.919.863.1794 +1.919.863.1797 FAX +31.33.453.4040 +31.33.453.4050 FAX +65.6383.4400 +65.6383.
