B&K Precision 1249B - Manual - Manual (Page 18)

18
CONTROLS AND INDICATORS
1. POWER Switch. Turns power on and off.
2. RGB TTL/LOW Switch. Selects TTL or low RGB output
level. When this switch is released (LOW position), a positive
logic state at the RGB output jacks (R, G, and B BNC jacks and the
RGB 9-pin D-type connector) is at 0.8V ±0.2V level. When this
switch is engaged (TTL position), the pulses are at a TTL level.
This switch also selects interlaced or progressive scan for
convergence patterns: when the switch is released the
convergence patterns use interlaced scan, and then the switch is
engaged, the convergence patterns use progressive scan.
NOTE
The DOT, LINE, RAST, and NTSC BARS
switches are mechanically interlocked: i.e., se-
lection of a new pattern automatically releases the
previous selection. Releasing all four switches by
partially pressing any one of them will provide a
color bats or staircase pattern with 100% white
level. The five selectable patterns are available at
the COMPOSITE VIDEO, IR/RF, or RGB
output jacks.
3. CONVERGENCE Switches. Select one of four available
convergence patterns as follows:
Only LINE switch engaged:
A single vertical and horizontal line intersecting at the center of the
screen.
LINE and 7 X 11 switches engaged:
7 horizontal lines and 11 vertical lines.
Only DOT switch engaged:
A single dot at the center of the screen.
DOT and 7 X 11 switches engaged:
7 horizontal rows by 11 vertical columns of dots.
5. RAST Switch. Selects a black or blank raster pattern. Sync and
reference black are provided for a blemish free raster.
6. NTSC BARS Switch. Selects NTSC Color Bar pattern.
7. COLOR OFF Switch. Works in conjunction with NTSC BARS switch
and selects color or monochrome (black and white) output. When this
switch is engaged, the color subcarrier is switched off and the NTSC
BARS pattern will be displayed as shades of grey. When this switch is
disengaged, the color subcarrier is switched on and the NTSC BARS
pattern will be displayed in color.
8. 4.5 MHz Switch. Turns 4.5MHz subcarrier (sound) on and off. When
this switch is engaged, a 4.5MHz sound carrier (modulated by