SMI 94
Technical
Manual
Februari
199
TABLE
OF
CONTENTS
Subi
ect
Section
Scope
1
General
Description
'
2
Electrical
Characteristics
3
Display
Performance
4
Controls
5
Options
6
Mechanical
Description
7
Environmental Performance
8
Agency Compliance
9
Interface
10
Theory of
Operation
11
Appendix:
Figures
Block Diagram
Trouble Shooting Chart
Schematics
\
-
^
VCX
SERIES
MONITORS
)
1.0 SCOPE
This
document
describes a monitor series that
covers
a
range
of horizontal
scan
frequencies
and includes
options
to
satisfy
requirements
in
a
wide variety
of
applications.
2 . 0 GENERAL
DESCRIPTION
The
monitor
series is supplied with a
20-inch diagonal
tube
with a
114
degree deflection.
(15",
17"
and
24"
CRT's
are
available.
The
monitor can
be custom configured
for
any horizontal
scan
frequency
from 32 KHz to 128
KHz, and for vertical
field
frequencies
from 49 Hz
to
120 Hz.
The
specific
values
included in
this document are
for a
typical
monitor
operating at a 66 KHz horizontal scan rate.
Other
scan rate
information can
be obtained
by
consulting
OEM
sales or
application engineering.
3 .
ELECTRICAL
CHARACTERISTICS
90 to
137 VAC
or 180 to 264 VAC
47-63
Hz
64 Watts
40 Amps
peak at
120
VAC
60 Amps peak at 220 VAC
3.1
Power Supply:
Input
Voltage
Power
Frequency
Power
Inrush
Current
C
)
3
3.2.1
Horizontal Sync:
Polarity Negative, edge
(Positive
Optional)
Signal Level
TTL
Signal rise/fall
TTL
Pulse
Width.
0.5uSec
(min)
to 50% of
total
horizontal
scan
time
Input Impedance typical 100
Ohms
Frequency
32 KHz
to
128 KHz
Blanking
3.0uSec
(min)
TYPICAL:
Vertical Timing
4
3.2.2
Vertical Sync:
Polarity
Signal Level
Signal Rise/Fall
Pulse
Width
Input Impedance
Frequency
Blanking
3.2.3
Video
Signal
Input
Polarity
Signal
Input Impedance
Negative
edge
(Positive
Optional)
TTL
TTL
40-400
uSec
typical
100 Ohms
49 Hz to
120
'Hz
(Inter
lace
Optional)
450
uSec(min)
Requirements
Positive is
white
(Negative
Optional)
1
Bit ECL
Differential
Typical 75 or 100
Ohms
4 .
0
DISPLAY
PERFORMANCE
4.1
Input
Conditions:
Character
Brightness
Contrast
Viewing Direction
Viewing Distance
Ambient
Temp.
Supply
Voltage
Warm up
time
Display
size
4 .
2
Video
:
Rise/Fall times
<«§»
At raster cutoff
White level
input video
should be set to result
in
30
Foot-Lamberts
in P4
or
equiva-
lent setting.
Along the CRT neck axis
18
inches
25
degrees
C
120
VAC
20
minutes
max.
14 x 11
inches +/-
0.1"
3.5
nsec Max.
(10%
-
90%)
4.3
Horizontal:
'
Video blanking 3.0 uSec
Horizontal (Min.
)
Horizontal Scan Delay
0-4
uSec
Adjustable Phase
Control
4.4
Vertical:
Video
blanking
5
450
uSec
Vertical
(Min.)
A
-
-B
=
0.07
inches
max
4.5.5 Center
Bow:
0.07
inches
max
4.5.6
Linearity
Using
the
above pattern,
the
linearity shall
be
better than
7%
vertically and better
that
9%
horizontally.
Resolution:
1300 Lines min. at
10 Ft-L
P104 phosphor and
standard
48%
Transmission glass
4.7 Light
Output: 3 0
Ft-L min. with
max settings
4.8
Display
Stability:
4.8.1
Jitter:
4.8.2
Jitter and Swim resulting
from
Monitor
Generated
Sources:
Radiated
power
line
interference
of
0.005 inch max., down
to a
frequency
of 47 Hz.
Interference
from
other
nonsynchronous
sources
shall not
produce
more
than
0.003
inches of
jitter on the display.
Turn on
Drift:
Aft$r
a 10
minute warm-up,
the
periphery of
the
-display shall not
drift
more than 0.10
inches
in any
direction.
During the
10
minute warm-up,
the
display
shall
not "wrap
around"
the
raster.
4-8.3
High
Voltage Regulation:
With
an
all
white
active
display-,
dimensions
shall not
change by
more
than
0.5%,
when
going from 2 Ft-L
to 3
0
Ft-L light
output
(ref. P104
phosphor)
4.8.4
Black
Level Stability:
When
changing
the data
pattern
from
5%
Average Picture
Level
(APL) to
100% APL,
the
reference
black
level
will stay
constant
with
2
%.
5 . 0
CONTROLS
5.1
User:
Brightness
Power
Switch
Contrast
(Available on Grey
Scale
Units)
5 . 2
Internal
Contrast
Brightness
Horizontal
Centering
(Phase)
Horizontal
Size
Horizontal
Linearity
Vertical
Size
Vertical
Linearity
G2
Bias
Static
Focus
Vertical
Dynamic
Focus
Horizontal
Dynamic Focus
6 . 0 OPTIONS
6
. 1
Video
TTL 1
to 3
Bits
ECL 1
to
3 Bits
Analog
Composite
Video,
RS343A
6
. 2
Phosphors
P104
standard
All
phosphors available
as
options
6.3 Anti-Reflection Treatment:
Fine
Etch or Polished is standard
Bonded
quarter wavelength optical
coated
panel
available
as
options
6.4 Orientation Format:
Landscape and
portrait with
horizontal
scan
in Long
or
Short dimension
6.5 Controls:
Remote contrast
LED
Power
indicator
6.6 Power:
ECL
Supply:
-10.0VDC nominal
§
500 ma
)
10
7.0 MECHANICAL
DESCRIPTION OF OPTIONAL
CABINET
WITH
TILT-SWIVEL
BASE:
Overall Height
Overall
Width
Overall
Depth
Rear
Panel
Dimensions
Weight
14.5"
17.8"
15.0"
13.0
X
9.5"
'36
Lbs.
(
3 68mm)
(452mm)
(381mm)
(330 x
241mm)
(16.4
Kilograms)
8.0
ENVIRONMENTAL
PERFORMANCE
i
5 to 55 degrees
C
-40
to 65
degrees C
5% to 95% noncondensing
10.000 Ft. max.
40.000
Ft.
max.
Vibration:
Operating
Temperature
(in
box)
Storage
Temperature
Humidity
Operating
Altitude
Nonoperating
Altitude
Sweep 5-500-5Hz:
0
.
5g
max from 0 to 200
Hz,
0.33g
max
from 200
to 500 Hz.
Duration of sweep
is 15
minutes;
then 15
minute dwell on peak
resonant
at
0.55g.
Shock:
20g
vertically,
longitudinally
and
laterally,
half-sine
wave with pulse width
ll-15mSec.
9 .
0
AGENCY COMPLIANCE
The unit is
designed to meet the following
requirements:
TJL478
Fourth Edition
Listed/Recognized
CSA C22.2
No. 154
IEC
380,
VDE 0806 GS
Mark, and VDE 0871
Class
B in
cabinet
DKHS
21
CFR, Subchapter J,
X-Ray
Certified
*
FCC
Class
B,‘Part
15 in
cabinet
11
10.0 INTERFACE
AC
Power
In:
CEE-22 Receptacle
or
AC
Safety
Interlock
10.1 Input Signals:
Connector:
9
Pin
Subminiature
D
Typical
Pin
Assignments
ECL
TTL
1. ECL Video
TTL
Video
2. ECL Video Return (GND)
N/C
3
.
H
Sync
H
Sync
4.
V Sync
V Sync
5. N/C
N/C
6.
ECL
(Not) Video
TTL
Video
Return
(GND)
7.
ECL
(Not) Video Return
(GND)
H Sync
Return (GND)
8 .
Sync
Return
(GND)
V Sync
Return
(GND)
9.
N/C
N/C
NOTE : Other
Pin
Assignments readily
accommodated
.
10.2 Analog Input:
Analog Input: BNC
-
RS343A
Levels
. 0 THEORY OF
OPERATION
11.1
Deflection
Board
The
deflection
board
does several tasks;
i)
processes sync
ii)
provides horizontal
yoke
deflection
iii)
provides
vertical yoke
deflection
iv)
provides
a sync
pulse
to the power
supply
v)
provides
the
required
focus voltage
vi)
provides
spot burn
protection
i. Sync Processing
The 74LS221 U4
is a dual non-retriggerable one
shot
with
Schmitt
trigger
inputs. Noise is reduced
by the
hysteresis
in
the inputs and
the non-retriggered
action. Jumper
blocks
JR1/JR2 are
provided to select the active edge.
The TLC555
U1
is a level triggered
timing device used
in
the
same mode as U4
The leading
edge
of horizontal
sync triggers the
one
shot
U4 .
The end of
time out
triggers the TLC555 Ul. The
second
delay is needed
to
delay the
signal
a full line. The
end
of
time out of Ul
triggers
Q1
for a duration
determined
by C18
and
R12.
The PLL
then centers
this pulse on
flyback.
The
data
centering
potentiometer V10,
should
be set to
center
the
video
in
the raster. The
amount and range of
delay
is
set
by R37
,
R68
and
V10.
Vertical
sync is
fed through
the
one shot
Ul
to get
better
noise immunity,
to offer
the option of inversion
and
to
allow some delay
for interlace
requirements.
ii.
Horizontal
Deflection
The
phase locked
loop
is
used
to
synchronize
the
horizontal
switch
to the
timing pulses
from the
computer or signal
generator.
The delayed
sync 'from Ul
is
buffered through
Q1
with
its
pulse width
set
'
(by
R12
and
C18)
and
is
capacitively
coupled
to
the
PLL, U2. The sync is fed
into pin
3 of the
MC13
91. This
sync pulse determines when
U2
(MC1391/PLL)
samples
the
ramp waveform generated by
the yoke
and
available to pin 4
of
U2. The ramp
waveform
is
capacitive-
ly coupled to
U2.
If
the
sampling
occurs
at
different
positions
on
the ramp
at
pin
4,
an
’error
voltage
is
generated
at pin
5. The
error
voltage
is
connected
to pin
7
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