Video Test Patterns

Application Information

The following is a listing of the available test patterns and a brief description of the purpose of each.

Pattern 1 — Dots 12 x 16 - Focus and Convergence This pattern is effective for checking and adjusting focus and convergence.

Pattern 2 — Alternating Pixels - Resolution

This one pixel on, one pixel off pattern is used to test display resolution of monitors and projectors as well as EMI testing for worst case radiation.

Pattern 3 — Alternating Pixels - Resolution

Same as #2 except that it has 1, 2, and 4 alternating pixels, as well as a solid “all pixels on” field.

Pattern 4 — Crosshair - Vertical/Horizontal Image Tilt, Orthogonality Test. This pattern is used for checking the screen borders, picture tilt, and making sure the picture is centered on the screen.

Pattern 5 — Rectangle/Square Crosshair - Linearity, Raster Centering and Geometry. Use this pattern (and pattern 4) to check and adjust the horizontal linearity. After centering the raster, this pattern can be used to set geometry. The four center boxes should be identical in height and width, and the four outer rectangles should be identical in height and width.

Pattern 6 — Crosshatch 12 x 16 - Static & Dynamic Convergence - This pattern is used to check and adjust both static and dynamic convergence, which means that the red, green, and blue video signals are aligned on each other.

Pattern 7 — Crosshatch 24 x 32 - Static & Dynamic Convergence - This pattern is used just as pattern #6 except that it has a finer test grid so the convergence can be done more accurately.

Pattern 8 — H Pattern Black on White - Resolution/High Frequency Response. This pattern is used to check or evaluate video clamping stability and video pulse response.

Pattern 9 — H Pattern White on Black - Resolution/High Frequency Response. This pattern can be used to check display focus or video pulse response.

Application Information

Pattern 10 — Flat Field - Purity Adjustment

This pattern is for making purity adjustments, which means making the entire picture completely white throughout the screen, without any color deviation.

Pattern 11 — Checkerboard 100% - Contrast Range, Screen Cutoff and Color Temperature. All three checkerboard patterns are used together to check color tracking of video amplifiers and adjust raster cutoff levels. It also may help in evaluating video amplifier clamping stability and CRT high voltage regulation.

Pattern 12 — Checkerboard 56% - Contrast Range, Screen Cutoff and Color Temperature. See #11.

Pattern 13— Checkerboard 14% - Contrast Range, Screen Cutoff and Color Temperature. See #11.

Pattern 14 — 8-Level Split Grayscale - Video Level Tracking (Color) Video Gain Linearity (Mono). This pattern is used for setting the grayscale, as well as, evaluating contrast linearity and tracking from low to high level video on monochrome and color monitors and projectors.

Pattern 15 — 8-Color Bar - Color Check, Verify Red, Green, Blue Balance. This pattern is used for testing all the color video channels and setting video drive levels. It is also used to check low frequency cross talk between red, green and blue video channels. It is commonly used for testing TTL monitors, TTL and analog converters and enhancement features of interfaces.

Pattern 16A — 16-color Bar - TTL Color Monitor Test & Split Field Analog Color Bars 100%/56% (See #15). This pattern is not available for the NTSC/PAL BNC output, see pattern 16B.

Pattern 16B — SMPTE/PLUGE - The SMPTE color bar and pluge composite video pattern can be used to set up tint, hue, brightness, contrast, gray scale and black level on NTSC and PAL video equipment. This pattern is available on the NTSC/PAL BNC output connector of the VTG 200 as Test Pattern 16. It is NOT available on any other VTG 200 output connector or on the VTG 150. See pattern 16A.

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Extron • VTG 150 & VTG 200 • User’s Manual

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