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Section1
- 067-1039-00
GENERAL
INFORMATION
AND SPECIFICATIONS
INTRODUCTION
The 067-1039-00 PATTERN GENERATOR provides
a series
of video test
signals
required
to calibrate
a multi-rate
display
monitor
(such
as
the
690SR Color
Display
Mainframe).
The 690SR can
be used with
computer display
or television
signal
sources
that use a wide
variety
of
scanning
systems.
The PATTERN GENERATOR emulates
these
scan
systems and provides
a selection
of test
signals
for
calibrating
the
display
monitor.
The PATTERN GENERATOR has three
front
panel controls
that allow it
to
emulate
the line and field
rates
of many scan systems,
present
or
future.
The Horizontal
Active Time adjustment
varies
the
interval
between
the horizontal
blanking
periods
(blanking
itself
is nominally
6.75 us);
the Lines per Two Fields
is set to the number of scan
lines
of the chosen standard
(an odd number generates
2:1 interlace,
an even
number is non-interlaced);
and the Lines of Vertical
Blanking
is
set
to
the
number of
blanked lines
in each field.
The Frame Period is
(6.75 us+
Horizontal
Active Time) times Lines per Two Fields.
There
are
8
pushbutton
switches
that provide patterns
to test
the
operation
of
the
display
monitor.
These
switches
generate
the
following
patterns:
1.
Flat Field
(White).
Tests purity
and colorimetry.
2.
Flat Field
(Grey).
Tests low light
level
calibration.
3.
Convergence
(Lines/Dots).
Tests
convergence,
geometry,
linearity,
and video amplifier
pulse response.
4.
Vertical
Bar.
Tests
the
video
amplifier
for
line
time
distortion
and integrity
of step response.
5.
Horizontal
Bar.
Tests high voltage
supply regulation.
6.
Window. Tests crt purity
error
due to shadow mask heating.
7.
Staircase.
Tests
color
balance,
nonlinear
video amp limiting.
With an external
ohrominanoe
differential
gain
and differential
phase.
1-1
distortion,
and
signal,
tests
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