1249B B&K Precision, 1249B Datasheet - Page 25

• Manufacturer Part Number: 1249B
• Description: COLOR GENERATORNTSC/RGB
• Manufacturer: B&K Precision
• Type: NTSC Benchtopr

Specifications of 1249B

• Patterns: Bar, Dot, Crosshatch, Raster
• Connection Method: RCA, RF, S-Video
• Power Source: 105,130VAC
• Signal Generator Type: NTSC Pattern
• Supply Voltage Range: 105V To 130V
• External Height: 86mm
• External Width: 290mm
• External Depth: 264mm
• Frequency: 30 Hz
• Equipment Type: NTSC Pattern Generators
• Lead Free Status / RoHS Status: na
• Lead Free Status / RoHS Status: na
• Other names: BK1249B

All convergence patterns are monochrome. On most sets the
entire 7 X 11 pattern (when 7 X 11 switch is engaged) will not be
visible due to overscan: it is desirable to display a pattern of at
least 7 horizontal and 10 vertical lines or dots.
BLACK RASTER PATTERN
1.
OPERATING INSTRUCTIONS (CONT.)
3. Convergence patterns use interlaced scan when the RGB
Only LINE switch engaged:
A single vertical and horizontal line intersecting at the center of
the screen.
LINE and 7 X 11 switches engaged:
Only DOT switch engaged:
DOT and 7 X 11 switches engaged:
TTL/LOW switch is released. This causes a slight jitter
effect in the appearance of the pattern. Progressive scan may
be selected by engaging the RGB TTI/LOW switch for a
jitter-free pattern. Most people prefer to use progressive
scan for convergence patterns, but some newer TV sets will
not accept the signal unless interlaced scan is used.
Perform the "INITIAL SET-UP" procedure.
7 horizontal lines and I I vertical lines.
A single dot at the center of the screen.
7 horizontal rows by I I vertical columns of dots.
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4.5 MHz SUBCARRIER USE
when the NTSC color bars pattern is selected. In a well designed
properly adjusted receiver, the sound trap should prevent the 4.5Hz
subcarrier from affecting the picture quality. In receivers where
the audio is not completely removed from the video component
of the signal, a "herring bone" pattern will appear on the screen.
engaged when any pattern is selected. The 4.5MHz subcarrier is
modulated by an audio tone (approximately lKHz) that can be used
to troubleshoot the audio circuitry in video equipment.
RGB OUTPUT
for testing and adjusting color monitors that use separate red,
green, and blue inputs rather than a composite video input. Such
color monitors are often used with computers having color graphic
display capability, etc.
The Model 1249B will provide compatible test signals for most
RGB monitors using standard 525 line, 15.750KHz horizontal
2. Press the RAST switch. The COLOR OFF switch should
3. The screen should not be completely black (black raster or
To check for audio isolation, the 4.5MHz can be switched on
To check the audio circuitry, the 4.5MHz switch should be
Independent red, green, and blue (RGB) outputs are available
have no effect on the display regardless of whether it is
engaged or disengaged.
black-burst).