1253 B&K Precision, 1253 Datasheet - Page 17

• Manufacturer Part Number: 1253
• Description: GENERATOR HANDHELD HDTV PATTERN
• Manufacturer: B&K Precision
• Type: NTSC Handheldr

Specifications of 1253

• Patterns: ANSI, Bar, Checker, Crosshatch, Focus, Multiburst, Needle, PLUGE, Raster, Staircase, Window
• Connection Method: BNC, S-Video
• Power Source: 9V Battery
• Equipment Type: NTSC Color Generator
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Description:
elements of these letters make it easy to judge the effects of focus adjustments.
Pattern Usage:
screen. Since it is difficult for CRT displays to achieve uniform focus across the entire screen, multiple
focus adjustments and/or compromise settings of the focus control(s) is necessary to achieve acceptable
focus. The focus adjustment method will be different depending on the number of focus controls and
whether the device is designed to display video or computer data.
A video display with only one focus control should be adjusted for optimum focus at the center of the
screen (where most action occurs). A data display with only one focus control should be adjusted for
compromise focus between the center of the screen and the edges of the screen (adjusting for sharpest
focus at a midpoint usually works well).
A video or data display with two focus controls is usually adjusted for best center focus with one of the
controls and best edge focus with the other control.
Some TV's have a Sharpness adjustment, and this sometimes improves the Focus by increasing the high
frequencies of the display.
Examples of Uncalibrated Displays:
has a Focus adjustment, adjust it for optimal Focus. Also adjust Sharpness.
Out of Focus
The text is not readable.
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Consists of capital letter “B”s and “K”s alternating across the screen. The closely spaced
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Used as a reference signal for viewing the effects of focus adjustments across the entire
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The following image indicates a TV with focus not set. If The TV
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