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1331A
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PLAY
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CERTIFICATION
The He
wlett-Packard
thoroughly tested
specifications wh
Packard
ments
the
Company
are
extent
traceable to
allowed
WARRANTY
This
in
one
major
specified
prove
they
is
damages.
Hewlett-Packard
materials
year
components
to be
are
expressed
and
from
period.
defective
returned
or
and
en
Company
inspected
it
was
certifies that
and
found
shipped from
this
instrument
to
meet its published
the
factory. The Hewlett-
further certifies that its calibration measure-
the
U.S.
by
the
Bur
product
workmanship.
the
date
of
listed
We
will
during
to
Hewlett-Packard.
implied.
We
National
eau's
AND
delivery,
in
repair
calibration facility.
ASSISTANCE
is
the
operating
the
are
not
" '
Bur
eau
warranted
This
or
warranty
warranty
or,
in
replace
liable
the
No
for
of Standards
against
case
manual,
products
period
other
consequential
defects
applies
of
certain
for
provided
warranty
was
to
for
the
which
Service
available
tenance
For
any
Sales
back
and·S~rvice
of
contracts
for
Hewlett-Pa~kard
and
repair
assistance,
this
manual.
.
or
custoµier
on-site.
contact
Office.
assistance
products
your
nearest
Addresses
agreements
that
require
Hewlett-Packard
are
provided
are
main-
at
the
(
OPERATING
Refer
to
Section
Refer
to
Section
standard
options: X95, 631.
AND
MODEL
X-V
SERIALS PREFIXED: 1319A
VI I for
VII
for
SERVICE
1331A
DISPLAY
instruments
instruments
with other
with
the
MANUAL
Serial Prefi
following
xes.
(
HEWLETT-PACKARD
1900
GARDEN
ManualPartNumber01331-90903.
MicrofichePartNumber01331-90803.
OF
THE GODS
COMPANY/COLORADO
ROAD, COLORADO
SPRINGS
SPRINGS
DIVISION
, CO
LORADO, U.S
.A.
PRINTED:
MAY
1973
r
Table
of Contents
-·
Model 1331A
Section
I
GENERAL
1.
1-
4.
11-10.
1-1
1-14.
1-16.
1-20.
II
INSTALLATION.
2-1.
2-3
2-5
22-9.
2-11.
2-13.
2-17.
2-19.
2-34.
2-36.
III
OPERATION
3-1.
3-3.
3-5.
3
-7.
3-9.
3-11.
3-13.
3-
15.
IV
PRINCIPLES
4-1.
4-3.
4-5.
4-10. Secondary
12.
44-15
4-19
4-21.
4-23. Block
4-25.
4-27.
Description . . . . . . . . . . . . . . . . . . . . . .
Cathode-ray
2.
Warranty
Available
Instrument
Inquiries.
Introdu
.
Initial
.
Preparation
7.
Claims ........
Repacking
Introduction
Controls
Applications
Preoperational
Operator's
Operating
Introdu
Variable
.
.
INFORMATION
Introdu
ction . . . . . . . . . . . . . . . . . . . . . 1-1
Tube
....
....
Accessories.
and
Manu
Identifi
Rack
Power Requirements
Power
Instrument
Monitored
Amplifier
Beam
Intensity
Operator's
The
Erase
Variable
Storage
Storage
Low Voltage
High
cation
. . . . . . . . . . . . . . . . . .
........
. . .....................
ction
....................
Inspection
for
Use ...
Mounting
Connections
Cooling
Inputs
Input
...
for
Shipment
. . .
........................
.............
and
Connectors ........
Find ....
OF
OPERATION
ction
Persistence
Storage
Cycle
.......
Precautions
Diagram
Voltage Power
................
.....................
....................
Adjustments
Checks ...........
Maintenance ...
Procedur
....................
CRT
Emission
...................
Persistence . .
................
Discussion
Power
TABLE
........
................
............
al
..
..............
...............
...........
............
...........
...........
Modifications . .
..............
es
...........
and
.............
Ratio ...
...........
Supplies . . .
Supply
....
.... 1-1
. .
......... 1-1
........
..........
.......
..
........
. .
....
and
.. .. ..
Storage
........
.....
...
. . .
..
. . .
. .
. .
. .
. .
. . .
. .
P
age
. 1-1
1-1
1-1
1-1
1-3
2-1
.
2-1
.
2-1
2-1
.
2-1
2-1
.
.
2-1
.
2-1
2-1
2-2
2-5
.
2-5
.
3-1
3-1
.
3-1
.
3-1
3-1
.
3-2
3-
.
3
.
3-2
4-1
.
4-1
.
4-1
4-1
.
4-1
.
4-1
.
4-2
.
4-2
4-2
.
.
4
-2
4
-2
.
4-2
OF
CONTENTS
2
-2
Section
4-29.
4-31.
4-33.
4-35.
4-37.
4-54.
4-56.
4-64.
4-71.
4-76.
4-78
4-82.
v
PERFORMANCE
ADJUSTMENTS
5-
1.
5
-5.
5-8. Mode
5-
12.
5-
16.
5-2
0.
5-2
4.
5-28.
5-32.
6.
5-3
5-40.
5
-44.
5-47. Low
1.
5-5
5-55. Write Depth
5;5
9.
5-63.
5-67.
5-
71.
-75.
5
5-79. Store
5-83. Z-a
5-87.
5-89.
5
-91.
5-93.
X-
Z-axis Amplifier . . . . . . . . . . . . . . .
Intensity
Control
Pulse
Detailed
Low
High
X-
Z-
.
Control
Pulse
Introduction
Performance
Deflection
Phase
Common
Bandwidth
Z-axis Amplifier
Erase
Dot
Store
Adjustment
High
Flood
Write
X-
Phase
Writing
Calibrating
Instruments
Phase
Attenuator
Input
Page
and
Y-axis Amplifiers . . . . . . .
Gat
e . . . . . . . . . . . . . . . . .
Circuits................
Circuits
Circuit
Voltage
Voltag
and
Y-axis Amplifiers
axis
Amplifier . . . . . . . . . . . . . . .
Circuits.
and
Shift
(CMRR) Check . . . . . . . . . . . . . . . 5-2
Time
Writing
Time
Voltag
Adjustments
Voltage
Adjustment..
Gun and
Adjustments
Gun
Adjustment
and
Y-axis Amplifier
Adjustment
Shift
Time
xis
Amplifier Risetime
Adjustment.
Shift.
Signal
..
. . . . . . . . . . . . . . . .
Theory
Power
e Power
Circuits
. . . . . . . . . . . . . . . . .
CHECKS
. . . . . . . . . . . . . . . . . . . . . . 5
. . . . . . . . . . . . . . . . . . . . .
Check . . . . . . . . . . . . . . 5
Erase
Checks..........
Check
Mode Rejection
Checks
Check . . . . . . . . . . . . .
Time
Check . . . . . . . . . . 5-5/ 5-6
....
. .............
e Power
. . . . . . . . . . . . . . . . . 5-7
Power
Adjustment
Collimator
. . . . . . . . . . . . . . . . . 5
Intensity
. . . . . . . . . . . . . . . . . . 5
...............
Adjustment
Rate
Adjustment
Adjustment..
. . . . . . . . . . . . . . . . 5-10
Modified
. . . . . . . . . . . . . . . . . . 5-10
..................
Compensation.....
Amplitudes
. . . . . . . . . .
Supplies . . .
Supply
. . . . . . . . . . . . . . . .
AND
Checks.
. . . . . . . . . . . . . 5-2
. . . . . . . . . . . . . 5
Checks.
Check . . . . . . .
Supply
Supply
.............
Limit
. . .
.........
. . . . . . . 5-2
.... 5-2
Ratio
. . . . . . . 5
.... 5-7
..
. . . . . . . 5-7
Gain
.
. . . . . . . . 5-8
.......
. .
..... 5-9
. . . . . .
. 5-7
..
5-10
5-10
5-11
4-2
4-3
4-3
4-3
4-3
4-4
4-4
4-5
4-5
4-5
4-5
4-6
-1
5-1
5-4
5-4
-8
-8
5-8
5
-9
-1
-3
-3
11
Model 1331A
Table
List
of
Contents
of
Illustrations
(
Section
VI
REPLACEABLE
6-1.
6-3.
VII
MANUAL
OPTIONS.........................
7-1.
7-3.
7-7.
7-11.
VIII
SCHEMATICS
SHOOTING
8-1.
8-3.
PARTS
Introduction
Ordering
Introduction
Manual
Special
Standard
Introduction
Schematics
Information
CHANGES
Changes
Options
Options
AND
.. .. .. . .. .. .. .. ..
TABLE OF
. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .
AND
7-117-2
..
..
.
.
.
.
.. ..
7-117-2
"7-117-2
7-117-2
7-117-2
................
............
.............
...........
TROUBLE-
..
. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . .
CONTENTS
Page
6-1
6-1
6-1
8-1
8-1
8-1
(Cont'd}
Section
8-8.
8-12.
8-15.
8-17.
8-20.
8-23.
8-25.
8-27.
8-30.
8-32.
8-34.
8-36.
8-38.
8-40.
8-43.
8-45.
8-47.
Page
Reference
Component
Preventive
Mechanical
Cleaning....
Switch
Repair
CRT
Semiconductor
Circuit
Board
Servicing
Heat
Troubleshooting . . . . . . . . . . . . . . . . . 8-3
DC Voltages
Waveforms
Trouble
Designations
Locations
Maintenance
Inspection
...................
Maintenance
and
Replacement
Removal
Replacement.....
Boards
Connections.
Boards
Sinks...
and
Removal
. . . . . . . . . . . . . . . . . . . 8-3
Etched
.......................
..................
...................
.. .. .. ..
Isolation.
. . . . . . . . . .
............
. . . . . . . . .
. . . . . . . . .
. . . . . . . . . . . 8-2
. . . . . . . . . 8-2
Installation
and
............
. . . . . . . . . . . . 8-3
Circuit
.. . .. .. .. ..
. . . . . . . . . . . . . . 8-3
8-1
8-1
8-1
8-1
8-1
. 8-2
8-3
8-3
8-3
8-3
. 8-3
(
Figure
1-1.
1-2.
2-1.
2-2.
2-3.
2-4.
3-1.
3-2.
3-3.
3-4.
4-
1.
4-2.
4-3.
4
-4.
4-5.
4-6.
5-1.
5-2.
5-3.
5-4.
8-1.
8-2.
Title
Model 1331A
Instrument
Rack
Mounting
Ventilation
X-Y
Amplifiers
Attenuator
Main
Model 1331A
nectors
Preoperational
General Operating
Multiple
CRT
Schematic
Secondary
Erase
Cycle
Variable Persistence
Pulse
Circuits
Overall Block
Phase
Shift Trace
Erase
Waveform
Write
Depth
Adjustment
Al
Component
A2
Component
X-Y
Display
Serial
Number
.......................
Tolerances
Input
Components
Board
A5
.....................
Contro
.............................
Procedure
Procedure
Display
Procedure
.......................
Emission
...........................
Block
Diagram
.....................
......................
Waveform
Locator
Locator
Locator
.........
............
...............
Circuit
Locations
ls
and
Con-
..............
............
............
Ratio
Pulsing
Diagram
............
................
...............
................
................
LIST
..........
..........
..........
.........
OF ILLUSTRATIONS
Page
....
1-0
1-3
2-1
2-2
.
2-4
on
2-4
3-3
3-4
3-5
3-6
4-3
4-3
4-3
4-3
4-5
4-7
/ 4-8
5-3
5-4
5-7
5-11/5-12
8-4
8-5
Figure
8-3.
8-4.
8-5.
8-6.
8-
7.
8-8.
8-9.
8-10.
8-11.
8-12.
8-13.
8-14.
8-15.
8-16.
8-17.
8-
18.
8-19.
8-20.
8-2
1.
8-22.
Titl
e
Schematic,
Semiconductor
tification.
Schematic,
Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-7
A3
Component
Component
A4
Component
A 7
Schematic 3 Measurement
and
Schematic,
Supply
Schematic 4 Measurement
and
Schematic, X-and
Amplifiers . . . . . . . . . . . . . . . . . . . . . 8-11-8-12
Schematic 5 Measurement
and
Schematic
A6
Component
A8
Component
Schematic,
Component
A5
Schematic,
Write Mode Troubleshooting
Guide.........................
Store
Guide.
Erase
Guide..............................
±50
V Power Supplies 8-5
Terminal
. . . . . . . . . . . . . . . . . . . . . . . . . . . 8-7
+158V
and
Locator
Locator. . . . . . . . . . . . . . . . 8-8
Locator. . . . . . . . . . . . . . . . 8-8
Waveforms............
High
Voltage
..........................
Waveforms.
Waveforms...
, Z-axis Amplifier
Locator...............
Locator...............
Control Circuits . . . . . . . . . . 8-15
Locator
Pulse
Circuits
Mode
Troubleshooting
. . . . . . . . . . . . . . . . . . . . . . . . 8-21 /8-22
Function
Troubleshooting
Iden-
+12.6V
................
Power
..............
Y-axis
.................
...............
. . . . . . . 8-17 / 8-18
Power
Conditions
....
Conditions
8-1118-12
Conditions
.........
8-19/8-20
8-9/ 8-10
8-9/8-10
. 8-13
Page
8-8
8-13
8-14
8-15
8-16
8-23
111
List
of
Tables
LIST
OF
TABLES
Model 1331A
Table
1-1.
1-2.
1-3.
2-1.
2-2.
2-
3.
3-1.
5-1.
5-2.
6-1.
6-2.
6-
3.
8-1.
Title
Specifications.........................
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference
Abbreviations.......................
X-Y
Values............
Attenuator
Z-attenuator
Definitions............................
Recommended
Performance
Low
Adjustments
Abbreviations
Parts
Replaceable
List
Schematic
Designations
Attenuator
Voltage
List...........................
of
Manufacturer's
Component
Components
Component
Test
Equipment........
Check
Power
Parts
Notes......................
Record . . . . . . 5-6a/ 5-6b
Supply
. . . . . . . . . . . . . . . . . . . . . . . .
for
Replaceable
. . . . . . . . . . . . . . . . . . . . .
and
..................
Parts
List
Values
Codes....
. . . . 2-3
. . . . . . . 2-3
6-11
Page
1-2
1-3
1-3
2-3
3-1
5-1
5-7
6-1
6-2
/ 6-12
8-6
lV
)
c
(
Genera
l I
nformation
Model 1331A
)
1-0
Figure
1-1.
Model 1331A
X-Y
Display
1331A-A-7
)
Model 1331A General
Information
(
1-1. INTRODU CTION .
1-2.
This
manual
information
X-Y
Display (figure
eight
sections,
pect
of
the
instrument.
the
rear
of
used for reference while
manual.
1-3.
This
section
1331A.
table
viations used everywhere
Section VI.
puter
tions. Special accessories
Standard
listed
The
1-1.
Table
printout
options
and
described
provides
for
the
1-1).
each
covering a specific topic
the
manual
contains
instrument
1-3
The
parts
and
uses computer-supplied abbrevia-
available
in
Hewlett-Packard Model 1331A
The
All
and
reading
specifications
lists
and
in
list
are
Section
1-4. DESCRIPTION.
1-5.
Model 1331A
purpose
display
real time information.
makes
applications:
nuclear
swept-frequency
phase
tude
1-6.
monitor
fresh memory requirements
mesh
1
-7.
deflection
front
SISTENCE,
controls,
X-Y
digital
it
useful
spectrometer, semiconductor curve tracer,
shift
measurements,
versus
panel.
time
Identical X and
displays
type
storage
All
controls
and
These
mode (WRITE ,
and
has
storage
graphic
ERASE.
and
or
analog
as
a read-out device
measurements,
displays.
Y amplifiers provide
with
bandwidths
CRT.
required to
dot
writing
include
been designed for general-
system
computer-processed
Its
and
raster
FOCUS, INTENSITY,
operating
manual
schematics
can
a description
describes
this
in
Section VI
listed
for
VIL
high
alphanumeric
are
compensate
speed
and
STORE),
and
is
be unfolded
any
manual
in
this
instrument
monitoring.
frequency
in
frequency ratios,
displays, and
up
to 1 MHz. Re-
minimized
are
located on
SECTION
I
GENERAL INFORMATION
the
to
section for a description
servicing
1-10. CATHODE-RAY TUBE.
divided
are
part
are
this
the
into
or
lQcated
and
of
of
Model
listed
the
abbre-
except
is
a com-
section.
are
It
can
data
response
following
displays,
ampli-
storage
as-
at
the
in
in
or
1-11. Model 1331A uses a post-accelerator
CRT
with
inized P31
graticule
to
eliminate
used
eliminates
stantly
complete
1-12. WARRANTY.
1-13.
The
and
warranted
of
this
warranty.
form
is
the
CRT
warranty
return
returning
warranty
it
The
ments
tag.
1-14. AVAILABLE ACCESSORIES.
by
the
1-15.
Accessories
are
listed
for
spot
the
PER
POSITION
-
a wide
able for use
of
or request
Service Office.
range
other
paragraph
a 10.5 kV accelerating
phosphor.
is
located
refresh
CRT
instrument
manual.
The
located
fail
page, complete
with
a defective
page.
warranty
in
manufacturers.
information
on
available
of a suitable
The
on
the
parallax
specifications.
within
the
having a mutilated
table
of
with
errors.
the
need for memory devices to con-
the
display. Refer to
(except
as
stated
The
CRT
CRT
warranty
at
the
rear
the
time
the
defective CRT.
CRT
may
availab
test
HP
le for
1-2.
Hewlett-Packard also
equipment
instruments
Refer to
from
accessories
rack
potential
8 x 10 division
same
plane
as
The
mesh
type
table
the
CRT)
on
the
inside
is covered
of
specified on
warranty
is
described on
be
void for
use
the
the
by a separate
and
warranty
this
manual.
claim
The
procedure for
instru-
serial number
with
Model 1331A
and
accessories suit-
and
latest
nearest
in
this
adapter.
storage
and
alum-
internal
the
display
storage
1-1
for
is
certified
front
cover
claim
Shou
ld
the
CRT
form
and
the
CRT
has
instruments
HP
Catalog
HP
Sales
/
(
-8.
Model 1331A
1
which
blanking
is
shades
1-9. Model 1331A
ing
ments) side-by-side
adds a third
is
obtained
of
gray.
two
instruments
obtained
with
writes
+ 1 V. In-between voltages provide
is
and
stores
dimension
with-IV.
proportioned to
(any
in a standard
Maximum
HP
1330/ 1331-series instru-
shades
to
the
permit
19-inch rack. Refer
of
display.
brightness
mount-
gray
Spot
1-
16.
INSTRUMENT
TIFICATION.
1-17.
This
manual
instruments
the
on
is
the
number
is
on a tag
manual
first
group
(figure
located
with a serial
title
of
1-2).
on
AND
applies
prefix
page. The
digits
in
The
instrument
the
rear
MANUAL
directly
number
serial
the
instrument
panel.
to
Model 1331
as
prefix
number
serial
number
IDEN-
listed
serial
1-1
General
Information
Table
1-1. Specifications
Model 1331A
VERTICAL
BANDWIDTH:
PHASE SHIFT: <1° to 0.5 MHz.
SETTLING
ameter
screen movement.
DEFLECTION FACTOR
Vertlcal:
justable
Horizontal: 1 V for 10 div deflection.
adjustable
COMMON
kHz for
tween
MAXIMUM
INPUT:
shie
connection.
INPUT
Single Ended:
pF
Differential: 200k
RECOMMENDED SOURCE IMPEDANCE: <20ko
between center
from
AND
HORIZONTAL
de
to 1 MHz (3
TIME: Signal settles
of
final value
1 V
for 8 div
from 0.09 V /
from 0.09 V /
MODE
outer
differentia
ld,
shield
RC
to
ground.
shield
REJECTION RATIO: 40
differential
and
inn
INPUT: ±50V
l between
may
lOOk
ohms shunt
conductor
to
ground.
AMPLIFIERS
dB
down
at
to
within 1 spot
in
<1
µsec
for
deflection. Internally ad-
div
to 0.14 V / div.
Internally
div
to
0.14 V / div.
input
of
3V m
aximum
er
coaxial input lea
(de +
peak
ac).
center
conductor
be
gro
und
ed with
ohms shun
ed
and
ted
by
by
approx
shield; <
Z AXIS AMPLIFIER
BANDWIDTH: de
INPUT
IN
MAXIMUM
RECOMMENDED
RC
Single Ended: lOk
to
ground.
Differential: 20k
PUT:
-1
beam
full
INPUT:
between
from
shie
center
ld to
to
>5
MHz; risetime,
ohms
shunted
ohms shun
Vb
lanks
spot
on.
±lOV
SOURCE IMPEDANCE: <20k
conductor
ground.
of
any
(de +
and
ted
in
peak
approx
by
approx
by
approx
tensity;+ 1 V
ac).
shield;
1 MHz).
any
dB
to
ds.
internal
approx
80
lk
ohm
70 ns.
60
60
turns
ohms
<lk
ohm
di-
on-
10
be-
and
80
pF.
hms
pF
pF.
GRATICULE: 8 x 10
0.95 cm.
axis.
WRITING SPEED: >20
DOT WRITING
DISPLAY
Horizontal:
Vertical:
INFORMATION STORAGE
dots
BRIGHTNESS:
STORAGE
Writing Mode: 1
Store
VARIABLE
1 min.
ERASE
BEAM
of
panel
Subdivisions
LINEARITY
<5%
<5%
per
second.
TIME
Mode:15
PERSISTENCE:
TIME
: <l sec.
FINDER: returns
setting
of X and Y position
switch.
div
TIME:
difference
difference
>100
foot
minute
minutes
internal
of
0.2
div/ms.
<4
µsec.
between
RATE
lamb
min.
min
variable
beam
graticule. 1 div=
div
marked
between
erts.
.
to
any
any
: 200
from 0.2 sec to
screen
con
trols.
on
major
two div.
two div.
thousand
regardless
Rear
GENERAL
POWER
WEIGHT:
DIMENSIONS: Refer to
£11·.·-
: 115V
60W.
(11,34 kg).
NOTE1
DMC"'StONS
C>"'C~S
~ATE
OME...S10"fS
C
~TACT
HEvri.LCTT· PACKAAO
lo-
r-
--
-
-
or
230V
net,
19-112
I~
hCHES .6.ND().ILLY.ETfRS.I
ARC
APPRQX•VATE
"RE
~
-
,
6-,.:!··..
R£0v
lb
Jf
MORE
RCO
,
CO
±10%,
48
(8,85 kg);
outline
i I r
to
440 Hz,
shipping,
drawing.
approx
25
lb
TOP
,~
~1
CATHODE-RAY TUBE
TYPE: post-accelerator
era
ting
potentia
1-2
AND
CONTROLS
storage
l, aluminized P31
tube
7.5 kV acce
phosphor.
!..---
l-
'
\..J
RIGH
-T
SIOE---<
~
-
1Q""
LJ
J
~
Q
g~
<CJ)
REAR
0
Model 1331A
General
Information
(
1-18.
ment.
that
listed
Section
proper
1-19.
on
an
Check
If
Errors
enclosed
the
the
serial
on
the
VII
for
instructions
instrument
in
MANUAL
serial
prefix
title
coverage.
the
manual
prefix
number
page
of
to
are
CHANGES
number
this
adapt
1-20. INQUIRIES.
1-21.
Refer
any
questions
change
Sales
by model
serial
inside
listing
sheet,
or
the
/ Service Office.
number,
number
rear
of
CAMERA ADAPTER: Model 10366B
mounting
cover
HP
in
all
of
Sales
/ Service Offices.
of a HP
camera.
DISPLAY CABLE,
MODEL
nection between
source.
cables
The
with
cable
three
regarding
instrument
Always
complete
identify
name,
correspondence.
this
manual
Model 195A, 197A,
10488A:
the
display
has
male
and
three
BNC
of
the
instru-
is
different
manual,
this
listed
the
to
the
the
manual
under
sheet
(if
manual,
nearest
instrument
and
complete
Refer·
refer to
errata
any).
to
for a world-wide
Table
adapter
provides
or
provides
the
color-coded
connectors
intercon-
signal
coaxial
on
from
for
the
HP
the
1-2. Accessories
198A
input
each
SERIAL
Figure
end
for
Length:
PREFIX NUMBER
1-2.
the
x, y,
approx
COMPLETE
Instrument
and z inputs.
12
ft
SERIAL
SERIAL
Serial
(3.6m).
FRAME ADAPTER: a 7-inch (18 cm)
allows
by-side
FILLER PANEL: covers
only
two
Model 1331's to be
in a standard
one
Model 1331
19-inch (48
halfofa
is
in a Frame
Frame
SUFFIX
NUMBER
Number
high
mounted
cm)
rack.
Adapter
Adapter.
NUMBER
panel
7000-A-22
which
side-
when
(
A
AT
B
BT
c
CP
CR
DL
OS
A
amp
assy
amp
bd
bp
c
c
ccw
coax.
coef
com
CRT
cw
d
dB
ext
F
I
ltd
assembly
attenuator,
resistive
motor,
battery
capacitor
coupling
diode
delay
device
termination
fan
line
signaling
ampere(s)
amplifier(s)
assembly
amplitude
board(s)
bandpass
(10
coefficient
clockwise
-I
(10
external
farad(s)
-2
)
tube
)
centl
carbon
counterclockwise
coaxial
common
cathode..-ey
decl
decibel
(lamp)
Table
1-3. Reference
E
F
FL
H
J
K
L
LS
M =
MP
FET
G
gnd
H
hr
HP
Hz
If.
inti
k
lb
lpf
m
M
ms
Designators
REFERENCE DESIGNATORS
misc.
electrical
fuse
filter
hardware
Jack
relay
=
inductor
speaker
meter
mechanical
field-effect
transistor(s)
giga
(10
ground(ed)
henry(ies)
hour(s)
Hewlett-Packard
hertz
intermediate
internal
kilo
(10
pound(s)
low-pass
mllli
(10
mega
(10
millisecond
part
ABBREVIATIONS
9
)
3
)
filter(s)
-3
)
6
)
part
freq.
p
PS
Q
A
RT
s
T
TB
TP
n
nc
no.
npn
ns
p
pc
pk
pnp
p/o
p-p
prgm
prv
PS
pwv
rf
and
Abbreviations
plug
=
power
transistor
resistor
=
thermistor
=
switch
transformer
terminal
=
test
point
nano
normally
normally
negative-positivenegative
nanosecond
pico
(10
printed
circuit(s)
peak
positive-negativepositive
part
of
peak-to-peak
program
=
peak
voltage(s)
picosecond
peak
voltage
=
radio
supply
board
9
)
(1
o-
closed
open
-12
)
(etched)
inverse
working
frequency
u
v
VA
w
x
y
z
rfl
rms
rwv
SCA
sec
std
trmr
u
usec
v
var
w/
w/o
wiv
Integrated
(unrepairable)
-
vacuum
bulb,
voltage
(diode)
=
cable
socket
=
crystal
network
=
radio
interference
root
mean
reverse
voltage
=
silicon
rectifier
second(s)
standard
trimmer
micro
microsecond
volts
variable
with
without
working
voltage
circuit
tube,
photocell,
regulator
frequency
square
working
controlled
-6
(10
)
inverse
neon
etc.
3/70
1-
3/ 1-4
(
Model 1331A
Installation
(
2-1.
INTRODUCTION.
2-2.
This
section
an ini
tial
procedures
by-step order.
warranty
for
repairs
shipment
conta
inspection
and
precautions
The
procedures for making
and
are
also
ins
instructions
of
Model 1331A.
are
for
repacking
described
presented
in
this
2-3. INITIAL INSPECTION.
2-4.
The
instrument
electrically before
it
for
damage
Check for broken knobs,
and
dents
or
scratc
the
claims
packing
paragraph
material
shipment.
that
hes.
for
was
inspected
may
hav
bent
If
damage
in
this
possible
mechanically
Upon
e occurred
or
broken
is
section.
future
use.
2-5. PREPARATION FOR USE.
2-6.
Model 1331A
for use
listed
other
instrument.
as a bench
in
Section
mechanical
is
shipped
instrument
I.
The
following
and
electrical
from
the
with
specifications
paragraphs
configurations
INSTALLATION
for
performing
Installation
in
step-
a c
laim
the
insltument
section.
and
receipt,
found, refer to
inspect
in
transit.
connectors,
Retain
factory
discuss
ready
of
SECTION
for
the
as
the
II
2-9. POWER REQUIREMENTS.
2-10.
Model 1331A
230 Vac
shipped
fically ordered for 230
one
to
fuse
fuse size is
2-11. POWER CONNECTIONS.
2-12.
ment
is
equipped
when
the
and
Electrotechnical
To
from a two-contact outlet,
two-conductor
ground
2-13. INSTRUMENT
±10%,
ready
voltage
the
in
instrument
mating
preserve
to
voltage
the
fuseholder
indicated
Hewlett-Packard
panel
and
with
connected to
plug
this
at
the
power outlet.
operates
48 to 440 Hz. All
for 115
the
desired
cabinet
a three-conductor power
through
of
Commission
adapter.
Vac
Vac
operation. To
other,
set
and
on
above
recommends
be
an
appropriate
the
the
power cord
protection
Connect
COOLING.
operation
the
install
the
the
grounded. Model 1331A
offset pin.
(IEC)
feature
use
on
either
SELECTOR
rear
fuseholder.
receptacle,
meet
a three-conductor to
the
115
instruments
unless
change
the
appropriate
panel.
that
tlie
cab
grounds
The
power
International
safety
when
adapter
standards.
operating
Vac
spec
from
switch
Correct
instru-
le
that,
wire to
or
are
i-
jack
(
2-7. RACK
2-8.
can
be
one
instrument
ing
opening
a filler panel. Refer
mation
Figure
mounted
on
MOUNTING
2-1
shows
in a single
is to
in
the
the
rack
•
Figure 2-
.
how
be
rack
rack
adapter
to
Section I for
adapter
1.
Rack
one
or
rack
mounted
can
and
filler panel.
Mounting
two
instruments
adapter.
the
extra
be
closed
ordering
If
only
mount-
with
infor-
1331A·A·S
2-14.
Model 1331A
air
circulation.
inch
clearance
bottom
mounted
temperature
2-15.
ances
mounted
beneath
and
exceed
2-16.
provide
culate
maximum
Other
require
2-17. MONITORED INPUTS.
2-18
the
nectors
sources
when
in
this
must
When
mount
shown
in
this
the
instrument(s)
the
maximum
+45
degC.
The
clearances
adequate
freely
ambient
mounting configurations
additional
Input
signals
X-,
Y-,
and
on
the
must
The
instrument
at
sides
mounted
configurat
not
ed
in
figure
configurat
ventilation
across
coo
Z-axis
rear
be
20 kilohms
is
adequately
and
singly
ion,
exceed
in
pairs,
2-2B
must
ambient
indicated
all
surfaces and
temperatures
ling
measures.
to
be
displayed
amp
panel.
cooled
requires
top
(figure 2-2A).
the
maximum
+55
degC.
the
must
be
ion,
the
not
temperature
in
if
air
are
and
environments
lifi
ers
through
The
impedance
or
less.
by
normal
at
least a 2-
and
5/ 8-inch
minimum
provided.
surface
be a heat
must
figure 2-2 will
is allowed to cir-
the
not
exceeded.
are
connected to
BNC
of
The
impedanc
at
When
ambient
clear-
When
directly
source
not
specified
may
con-
signal
e
2-1
Installation
rated
in
the
inductive
center
cables
units
current.
is
to
however, a
coupling
conductor.
are
used
drawing
One
method
ground
common
the
needed to reject
and
the
center
loops
grounded.
is
ance
of
may
develop
In
these
accomplished
for Rd.
This
Model 1331A
cable
shield
and
This
or
where
or
generating
shield
noise
conductor.
when
cases, a
by
substituting
is
the
as
shipped
none,
is
especially
the
of
reducing
at
mode
common
At
satisfactory
input
from
Model 1331A
through
or
capacitive
very
little,
true
cable
is
the
input.
both
times,
routed
amounts
interference
capability
large
the
rejection
to
other
the
shield
compromise
a low
value
configuration
the
factory.
or
in
the
where
long
near
of
Sometimes,
is
the
shield
ground
is
directly
of
resist-
(Rd=
47Q)
B
Figure
from
the
BNC shield to
kilohm.
can
No
2-19. AMPLIFIER INPUT MODIFICATIONS.
2-20.
Y-,
can
Inputs
be
done
. 1250
-077
Several
and
Z-axis
be connected for
ended operation.
can
be
changed. The
be
changed.
following
2-21.
to
the x-and
paragraphs.
Deflection
BNC connectors,
ductor connected to
amplifier.
showing
input.
Re=
not
board
inputs
balanced,
pletely
B
on
2-22.
cable
the
As
shipped
100
kn,
installed
(see figure
can
both
single
figure 2-4),
Single-ended Operations. When coaxial
is
used,
2-2.
Ventilation
not
in
use
with a BNC
4).
modifications
amplifier
input
either
The
input
input
The
modifications
Amplifier
y-axis amplifiers
with
the
the
Figure
2-3
is
configuration
from
the
and Rd= 47n.
but
pads
are
2-4)
for customer
be
modified to
in
impedance
ended
large
or
anything
spurious
with
ground
must
should
shorting
can
be m
circuits.
differential
termination
attenuation
are
Inputs.
are
shield
two
inputs
a simplified
of
one
deflection amplifier
factory,
Ca;
Cb, Cc,
provided
be
fully
and
shield
in
between.
currents
Tolerances
be less
be
shorted.
plug
ade
These
described
The
through
and
center
of
a differential
Ra =Rb
and
on
installation.
differential
sensitivity,
grounded
may
T.
5111
1331A
-A-1
than
This
(HP
Part
to
the
circuits
or
single-
resistance
ratio
can
in
the
inputs
floating
con-
schematic
= 2.7n,
Cd
are
the
circuit
The
and
com-
(A
and
be
gene-
1
X-,
2-23. Differential Operation.
input
is
driven
better
to
maintain
that
is,
Re=
stituting
ential
2-24.
As
(8
a 100
balance.
X.
shipped
divisions
accomplished
INPUT.
1
changing
the
showing
shows
input
their
The
the
circuits.
the
components
ratios.
ponents
Table
and
by a balanced
balanced
Rd. As
kn
resistor
and
from
Y-axis
the
vertical
with 1 volt
attenuation
values
Figure
input
circuit
physical
required
2-2
contains
their
shipped
factory, full
and
10
of
the
2-3 is a simplified
components
locations.
for
four
Hewlett-Packard
If
the
cable,
impedances
from
the
for
Rd
restores full differ-
Amplifier
sca
divisions
input
to X
ratio
can
be
attenuator
components
Table
common
a description
part
deflection
it
is
usually
at
the
input;
factory, sub-
Attenuation
le deflection
horizontal)
INPUT
or
changed
schematic
and
figure
2-1
lists
attenuation
of
the
com-
numbers
.
is
Y
by
in
2-4
the
.
NOTE
The
2. 7
ohm
must
2-25.
Resistor
listed in
be
removed
values
table 2-1
resistor
can
shown
when
Ra
for
attenuation
be
determined
is
in
used.
figure 2-3
ratios
from
the
not
fol-
lowing formula:
Ra+
Re
Vfsd
= Re
Resistor
for 1/i
Ra + Re
maximum
duced b
pation
spacing
W, 1%,
is
metal
less
input
eca
use
limitations.
on
main
film resistors.
than
voltage
of
resistor
assembly
5 kilohms,
must
be
power dissi-
A5
is
If
the
re-
2-2
Model
1331A
Table 2-1.
X-Y
Attenuator
Component
Values
General Informat
ion
(
vfsd
Re,
Full-Scale
R
a,
Rb
Rd
Ca,
Cb
Deflection
Voltage
1 (as shipped) 0 100k 0 0
2
5
10
51.1k
82.5k
90.
Description
R:
fixed, metal film, 100k,
R:
fixed, metal film, 82.5k
R:
fixed, metal film, 51.1k ohms,
R:
fixed, metal film, 20k
ohms,
9k
1%
1/2W
ohms,
Table
1%
1%
1% 1/2W
51.1
k 5.5-18 pF
20k 5.5-18
f
Ok
2-2.
Attenuator
1/2W
1/2W
pF
0 0
Components
Par
ts
List
HP
Part No.
0757-0367
0757-0048
0757-0853
0757-0190
Approximate
Impedance
Cc,
Cd
100k
0
33 pF 102.5k
102.2k
100.9k
Input
R: fixed, metal film, 10k
R:
fixed metal film, 10k
R:
fixed, metal film, 9090
R:
fixed, metal film , 5110
R:
fixed, metal film, 1000
R:
fixed, metal film, 100
C:
variable,
C:
variable
C:
fixed, 33 pF
5-5
9-35
- 18 pF
pF
ohms,
ohms,
ohms,
ohms,
ohms,
ohms,
1% 1/2W
1%,
1/8W
1%, 1/8W
1%,
1/
1%
1/8W
1%,
1/8W
Table
8W
2-3.
Z-attenuator
Vmax R173 R175
R174 R182
1 (as
1oon
10K
shipped)
Component
cc
0
0757-0839
0757-0442
0757-0288
0757-0438
0757-0280
0757-0401
0121-0061
0121-0046
0160-2150
Values
Approximate
Input
Impedance
10.
lK
2
10
5110Q 5110Q
9090Q
1ooon
9-35
pF 10.22K
0
10.
09K
2-3
Installation
Ca
Model 1
33
1A
~
dA
CENTER
SHIELD
C>
Cc
E>~
8
R
--0
A
i
B
i
Figure
c 2.7
D
D
2-3.
~
CJ
X-Y
2.1
Ra
C•
2.7
Rb
Amplifie
Re
Rd
-=
rs
Input Circuit
Cc
Cd
1331A-A-10
"'~--;JJ
':
.-t:~~~~
:i
·?
~
·
~?~~
~
~,,~t
~
2.7
Figure
2-4.
o"o
,
o~
§~00
~o=~
l2a
Attenuator
!=
~:o
Components
00=
Locations on
Main
Board
A5
1331A-A-8
)
2
-4
(
Model 1331A
2-26.
The
approximate
pensation
the
following formula:
2-27.
from
capacitor
recalculate
If
practical
the
Cc
capacitor
formula
Ca:
value,
Ca
can
values
and
of
in
par
agrap
use the following
in
picofarads,
be
ca
cannot
h 2-25,
determined
be
attained
add
formula
of
com-
from
shunt
to
attenuation
ination
values are:
A5Rl
information
x-
and
pensation
have
impedance (<l kilohm
2-32.
plifier
main
a
resistor and
and
ground
than
the
amplifier
power dissip
ratio.
For
and
a 5:1
ratio
Ra = 60 and
75 respectively
on
compensation
y-axis
been
When
input
consideration
10
kilohms
attenuation
may
not
changed
shunting a resistance
to
change
insert
(point
are
must
ation
limitations.
example,
are
required,
Re
for
the
z-axis amplifier).
applies here,
be
required
to
produ
ce a low
).
(lower)
is
the
desired
it
between
A on figures
used,
maximum
be
reduced
when
a 75-ohm term-
the
= 15
(A5Rl
in
the
paragraphs
when
across
the
impedance, the
impedance
the
amplifier
2-3
and
input
because
Installation
resistance
74
and
The
on
but
com-
Ra
and
RC
termination
the
am-
. Select
input
2-4).
If
less
voltage
of
to
resistor
(
2-28.
Z-axis
tenuation
plifier can
A5R90
ential input
ratios
calculated
2-29.
and
quired.
2-30.
ination
normally
differential.
ended
resistance
changing
resistance
method
attenuation
the
amp
2-31.
get a certain
be considered:
ratio
be
or
A5R l
are
listed
with
If
the
10,
compensation
If
required,
Vmax
intensity
full
polarity).
Termination
resistance
100
The z-axis
and
20
can
attenuation
between
is
simple
ratio. Because
second
lifier.
method cannot
When
changing
termination
Amplifier
of
the
input
changed
74
and
is required.
in
table
the
following formula:
_
V
max
-
ratio
of
use
c =
c 13
NOTE
is
the
voltage
or
blanking
imp
of
the x-and
kilohms
kilohms
be
the
single
amp
changed
resistors,
input
because
attenuation
termination
Attenuation.
circuit
by
changing
A5Rl82
Three
2-3.
Rl82
Rl82
Ra
to
capacitor
the
following formula:
Rl82
---
Rl74
that
edance.
lifi
differential.
by eith
and
it
of
impedance,
of
or
all four
common
Other
+ R174
Rb
Cc
will produce
(depending
The
y-axis amplifiers
ended
and
er
is
10
The
er
or
conn
ground.
does
not change the
design
be used
resistor
impedance
The
the
z-axis am-
the
values
if
differ-
attenuation
values
is between 0.1
kilohms
of
considerations,
on
two
can
may
be re-
on
input
200
two methods:
ecting a third
The
things
term-
kilohms
single
termination
second
the
z-axis
values
must
and
the
at-
of
be
is
to
2-33. CLAIMS.
2-34.
The
warranty
instrument
manual.
warranty
if
operation
received,
Service Office
of
this
Office will
waiting
is
Refer to
statement.
is
notify
manual
arrange
for
settlement
printed
not
immediately
statement
inside
the
rear
of
this
If
physical
as
specified
the
carrier
for addresses).
for
repair
of
the
(refer to
and nearest
applicable
the
front
manual
damage
when
the
the
The
HP
or
replacement
claim
with
cover
for
is found
instrument
HP
list
Sales
the
2-35. REPACKING FOR SHIPMENT.
2-36.
If
the
Model 1331A
HP
Sales
/ Service Office for service
a
tag
showing
ment
serial
required.
2-37.
Use
material.
ava
ilable,
information
u
se
d.
Materials
mally
include
a.
A double-walled
test
strength.
b.
Heavy
tect
all
material
such
as
c.
At
approved, shock-absorbing m
firm
polyurethane
d. Heavy-duty
side
of
carton.
owner
number, and
the
original
If
the
original
the
HP
and
recommendations.
used
the
following:
paper
instrument
such
as
Kimp
ak around
least 4 inches
(with address), complete
Sales
for
or
polyurethane
foam.
shipping
is
to
be
shipped
or
repair,
a description
shipping
packing
/Service Office will provide
shipping
carton
sheets
surfaces;
all
of
of
use a nonabrasive
projecting
of
tightly-packed,
ate
tape
of
carton
material
on
materials
an
instrument
at
least
cardboard
or
cushioned
parts.
rial
such
for
securing
the
and
275
to
this
of
this
the
CRT
Sales
in
back
/ Service
without
carrier.
to
an
attach
instru-
service
packing
is
not
to be
nor-
pound
to
pro-
paper
industry-
as
extra-
out-
or
is
/
2-5
/ 2-6
(
Model 1331A
Operation
(
3-1.
3-2.
1331A op
tor
opera
words a
of
INTRODUCTION
This
section
era
ting
's
checks
ting
the
instrument.
and
instructions.
nd
phr
ases
contains
controls,
adjustments, and
Table
used
3-3. CONTROLS AND
3-4.
All co
ntrols
described
expl
3-5. BEAM FIND.
3-6.
to locate
due
POSITION
the
BEAM
in
anatio
n are covered
The BEAM
the beam
to
a large
FIND
and
figure 3-1.
FIND
input
controls,
cont
connectors
Controls
in
cont
when
voltage,
or a malfunction.
rol,
pro
.
an
explanation
mod
es
of
operation, opera-
step-by-step
3-1 co
ntains a list
to d
escr
ibe
the
CONNECTORS.
are
identified a
requiring
the
following
rol is a sli
it
is deflected
misadjustment
ceed
as
follows:
para
de
switch used
off
To
SECTION
OPERATION
of
Model
of
operation
nd
further
gra
phs.
screen
of
the
operate
111
Set
a.
b.
c.
visible.
d. D
to vie
e.
n
ot
operate corr
3-7. INTENSITY.
INTENSITY
Set
BEAM
Turn
ete
wing
area.
Set
A
high
period
the CRT
INTENSITY
rmine action
BEAM
inten
of
time
display
FIND
ectly
sity
FIND
with
display
can cau
area.
fully ccw.
to ON.
slowly cw
required to
to off. Model 1331A will
BEAM
over
se
burn
until
return
FIND
an
extended
damage
set
beam
beam
to ON.
to
is
Word
or
Phrase
Write
Persistence
Store
Erase
Int
ens
ity
Bloom
Backgro
illumination
Fade
und
positive
Table
3-1.
Definitions
To
display
The length
C
RT
moved
To
a
display
To
been
The
CRT.
Visible,
tortion
A light-green
tire
An increase
tens
transform
on
the
of
after
the
.
retain
, for
that
remove all
written
brightness
nonsymmetric
of a display
CRT
viewing
ity
occuring
Definition
an
input
CRT.
time a displ
writing
an
extended
has
been
displays
or
sto
red
of
a displ
written
illumination
area.
in
background
in eith
signal
signal has been re-
written
and
on the CRT.
ay
al
expansion
er
write
into a visua
ay
remains
period
of
on the CRT.
blooms that
written
on
the
CRT.
cove
ring
illumination
or
store
on
tim
e,
on the
and
the
en-
mode.
l
the
have
dis-
in-
(
Fade
negative
A decrease
or
write
sto
in
re
trace
mode.
int
ensity
occuring
in eith
er
3-1
Operation
Model 1331A
3-8.
The
INTENSITY
tens
ity from completely
ness
(cw)
in the
CRT, follow
3
-2
before
slowly
vie
wing
the
operating
until the
level
without
display
control
off
(ccw) to
write
mode. To
preoperational
the
instrument. Increase
brightness
blooming.
adjusts
maximum
avoid
procedure
is
at
the
display
damage
in
intensity
a comfortable
3-9. APPLICATIONS.
3-10. Model 1331A
of
x-,
y-,
and z-axis
and
sensitivity
in
Section I).
ferential
:
md
modified (Section
many
paragraph
cations.
or
single
amplifier
specific
in
can
be
used for
displays
specifications (refer
Furthermore,
ended),
input
termination
II)
to
applications.
Section I
the
amplifier
meet
Refer to
for
a l
within
ist
any
application
its
bandwidth
to
specifications
type
of
input
deflection factor,
impedance
the
requirements
the
description
of suggested
3-11. PREOPERATION ADJUSTMENTS
OPERATOR 'S CHECKS.
3-
12.
The
preoperational
figure 3-2.
check to verify
This
procedure
proper
procedure is
also
serves
operation
of
shown
as
an
the
instrument.
operator
in-
bright-
to
the
figure
(dif-
can
be
app
AND
of
li-
in
3-13.
3
-14.
limited to
and
on
This
surfaces
with
can
detergent.
OPERA
Operator's
the
exterior
the
exposes
a commercial
be removed
cleaning
contrast
the
and
smooth
TOR'S
maintenance
ope
rator
's
of
screen
face
of
metal
glass
with a mi
MAINT
checks
the
instrument.
for
removal
the
CRT
surfaces
cleaner.
ENANCE.
of
Model 1331A is
in
paragraph
Pull
and
for cleaning.
can
Stubborn
ld liquid
3-15. OPERATING PROCEDURES.
3-16. Fi
operating
photographs
instructions.
explained
be modified
unique
gures
3-2
procedures.
correspond
Only
in
the
or
operating
through
the
illustrations.
combined to fill a
requirements.
The
basic
3-4
contain
index
to
step
operating
These
step-by-step
numbers
numbers
techniques
techniques
wide
3-12
upward
cleaning.
Glass
be
cleaned
residues
household
on
the
in
the
are
can
variety
of
3-2
Model 1331A
Operation
(
1.
FOCUS.
2.
INTENSITY.
Paragraph
fer to
PERSISTENCE.
3.
write mode.
4.
ERASE.
from
CRT
mode only.
5. WRITE.
information
6. STORE.
for
an
extended
7.
VERT
of
trace.
8.
HORIZ
tion
of
9.
LINE
indicator.
is
applied
FRONT
Adjusts
Press
Press
Press
POSITION.
POSITION.
trace.
to
sharpness
Adjusts
3-8.
and
viewing
in
on
CRT.
in
time
Lights
instrument.
PANEL
brightness
Adjusts
release
area.
to
write
to
store
on
Adjusts
Adjusts
when
of
duration
to remove
Operates
and
input
CRT.
vertical
horizontal
operating
10
trace.
of
trace. Re-
of
trace
display
in
display
information
position
2
in
write
input
posi-
power
B A
REAR
A.
LINE.
power.
B.
FUSE. Protects
loads.
C.
SELECTOR.
115V
D. BEAM
into
E. ASTIG.
F. TRACE ALIGN.
graticule.
G. Y
plifier.
X
H.
plifier.
Connects
or
230V operation.
FIND.
viewing
Adjusts
INPUT.
INPUT.
Connects
area.
Input
Input
PANEL
instrument
instrument
power
Brings
trace
off-screen
Refer to
dot
Aligns
connector
connector
trace
to
from
current
transformer
trace
Paragraph
symmetry.
with
horizontal
for
y-axis
for x-axis
1331A-A-1
operating
over-
for
back
3-5.
am-
am-
(
10.
LINE
switch. Applies
strument.
operating
Figure
power to in-
3-1.
Model 1331A
I.
Controls
Z
INPUT.
plifier.
and
Input
Connectors
connector
for z-ax1s
am-
3-3
Operation
11,
13
1,
3
6,8
7,
2
Model 1331A
4,
5
8
1331A-A-2
1.
Set
INTENSITY,
ccw.
2.
Set
LINE
LINE
indicator
3.
Put
instrument
WRITE
Do
when
control.
4.
Adjust
brightness should
tinguished
able
viewing
5.
turned
Adjust
eas
cw.
INTENSITY
ily visible
and
switch
to ON
lights.
in
write mode by press
pushbutton.
not
allow
adjusting
INTENSITY
vary
in
full ccw position to
brightness,
control
with
minimum
PERSISTENCE
and
the
dot
to bloom
the
INTENSITY
control.
from co
as
so
display
persistence.
observe
Display
mpl
etely ex-
an
accept-
control is
dot
full
that
ing
dot
is
6.
Adjust
its
zontally
at
either
7.
Adjust
full
across
extreme
Adjust
8.
trols
9.
Apply
connector.
appear
10.
Adjust
trace
11.
Adjust
Display
of
control and
for defocused
12.
Adjust
symmetry
13.
Adjust
HORIZ
full
range.
across
extreme
VERT
POSITION
range.
CRT
of
Display
and
control.
HORIZ
to
center
display
1 kHz, 1 V p-p
This
on
CRT.
TRACE
with
horizontal
FOCUS
dot
will
focused
display
ASTIG
(roundness).
FOCUS
POSITION
Display
CRT
and
of
control.
control through
dot
will
out
of
control
dot
will
move
out
of
viewing
and
VERT
will
cause
ALIGN
dot
signa
on
as
POSITION
CRT.
l to X
horizontal
necessary
graticule
control through
be
defocused
near
at
midrange.
dot.
contro
l for
best
for
smallest
dot
move
viewing
through
area
lines.
its
full
each
display
size.
horiarea
its
vertically
at
either
con-
INPUT
trace
to
to
align
range.
extreme
Adjust
dot
3-4
Figure
3-2.
Preoperational
Procedure
(
Model 1331A
Operation
1.
Perform
3-2).
2.
Press
3.
Adjust
trols for desired
display.
4.
Press
5.
Press
6.
Press
preoperational
TO
WRITE
WRITE
INT
Excessive intensity
ence
duces
stored.
STORE
WRITE
ERASE
pushbutton.
ENS
ITY
and
brightness
NOTE
when
writing a display
the
time a display
TO
STORE
pushbutton.
TO
ERASE
pushbutton.
pushbutton.
procedures (figure
PERSI
and
and
STENCE
duration
persist
-
re-
can
be
con-
of
(
7.
Erasure
each
new
cases
where
are
to
3-4).
Figure
should
be
displayed
3-3.
take
piece
two
or
General
place
of
information,
more
pieces
simultaneously
Operating
prior
to
of
information
Procedure
writing
except
(Figure
in
1331A·A-3
3-5
Operation
Model 1331A
1. Perform
3-2).
2.
Press
WRITE
3.
After
desired
press
STORE
4.
Use HORIZ
to position
written
previously written.
Keep
write
that
tion
5.
Press
WRITE
6.
Use
HORIZ
to position
7.
Press
STORE
format
ion is written.
preoperational
pushbutton.
information
pushbutton.
and
VERT
trace
so
will
not
interfere
NOTE
write
periods short.
period reduces
previously
can
be
stored.
pushbutton.
and
VERT
trace
as
desired.
pushbutton
procedures (figure
has
been written,
POSITION
that
information
with
information
Each
the
time
written
informa-
POSITION
after
desired in-
controls
to be
controls
3-6
Repeat
8.
desired.
Figure 3-4. Multiple
this
procedure
as
many
Display
times
Procedure
as
1331A-A-4
)
(
HEWLETT
II
PACKARD
CATHODE-RAY
The
cathode-ray
Oscilloscope
,warranted
failure
tubes and tubes
under this warranty.
claim shou
claims
nearest
We
neering evaluation helps us
you.
side
for
with
Hewlett
instrument
would
Please
of
this sheet and return
tube
(CRT) supplied in
and replacement
by
the Hewlett-Packard Company against electrical
a period
ld
Hewlett-Packa rd should be processed through your
manual).
like
fill
of
one year
with
phosphor
If
the
be
made
with
-Packard Sales/Service
to
evaluate every defective
out
the
CRT
Hewlett-Packard Company
1900
Garden
Colorado Springs, Colorado
Attention:
TUBE
CRT's
from
or
CRT
the responsible carrier.
to
provide a better
Failure
it
with
the
of
the
CRT
QA
WARRANTY
your Hew
purchased
the
date
mesh burns are
is
broken when received, a
Office
(listed at rear
CRT.
Report
defective
Gods Road
CRT
80907
lett
from
of
sale.
not
All
This engi-
product
on
the reverse
to:
-Packard
hp
are
Broken
included
warranty
of
for
5950-7124
To
avoid damage
the shipping instructions below; warranty
on broken tu
It
is preferable
replacement
is
not
available, pack the
below:
1. Carefully wrap the tube in 1/4 inch
batting
2. Wrap the above in heavy
3.
Pack wrapped tube in a rigid container which
at
dimension.
4. Surround the tube
excelsior
sure
to
the
tube
while
bes.
SHIPPING
that
CRT
carton.
or
other
lea
st 4 inches larger than
or similiar
the
packing
INSTRUCTIONS
the
defective
If
the carton
CRT
soft
padding material.
with
at
shock absorbing material;
is
tight
all around the tube.
in
shipment, please
CRT
according
kraft
paper.
least 4 in ches
Thank
CRT Dep:J
credit
is
not
be
returned in the
or
packaging material
to
the
instructions
thick
cotton
the
tu
be
in
of
packed
you,
rtment
allowed
is
each
be
follow
. ,
I
HEWLETT-PACKARD
COMPANY
1900
GARDEN
OF
THE
GOOS
ROAD, COLORADO
SPRINGS, COLORADO,
U.
S.
A.
r
.........
"""-'-.__....~~
i
.......,;............-_
...
___
---.,.;;...
**
'srt'
1 !
.,
I
I (
"'I
'HU
FROM:
1.
HP
2.
HP
3. CRT
4.
Please
face below.
HEWLETT.
CATHODE-RAY
instr
ument
MODEL
instrument
SERIAL
describe the failure and, if.possibl.
SERIAL
NO.
NO.
NO.
____
TUBE
-----------------------
-----------------------
....;;._,
______
e,
PACKARD
FAILURE
....;;_
show the trouble on the appropriate
REPORT
_____________
_
CRT
I
HEWLETT
5. Warranty claimed ?
6.
HP
Sales
/Service Office
-PACK
ARD
COMPANY
1900
______
GARDEN
Yes
Of
___
THE
_ No
_
Repair
GOOS
ROAD, COLORADO
____
Order No.
_
------
SPRINGS,
COLORADO
)
, U. S. A .
t
Model 1331A
Theory
c
PRINCIPLES
4-1.
INTRODUCTION.
4-2.
This
section
the
principles
It
also
contains
1331A keyed to
block
planation
is provided
diagrams
of
contains a simp
of
variab
le
persistence
functiona
an
of
circuit
circuit functions, keyed
after
the
block
l descriptions
overall block
groups. A detailed ex-
diagram
lified
diagram
to
the
discussion.
4-3. VARIABLE PERSISTENCE
AGE .
4-4.
The
following simplified
vided to give the
overall operation
4-5.
THE
4-6.
The
storage
ventional electrostatic deflection electron
aluminized
tional electron
write
gun.
second electron
shaping
beam
collector
and
the write
4-7. The
gun
e
mit
cloud (flood electrons)
toward
collector mesh.
on
The
metallic
4-8.
and
transparent
coating
action
ing.
dielectric
the storage
tion,
Because
face drops to
flood electrons
collector mesh.
mesh, and a storage
variable
gun
flood
's
horizontal
a cloud
the
the
inside
collector
mesh
The
action
variable
consisting
takes
This
surface
material
the
storage
of
reader a better
of
the
instrument.
STORAGE
phosphor
Additionally,
persistence elements
and
of
electrons from
storage
of
persistence possible.
metallic
place
mesh
the
about
CRT
CRT
viewing surface.
gun
in a storage
gun
(called
and
accelerator grids, collimator, a
the
viewing
gun
is
located
deflection plates.
mesh by
The
collimator
the
funne
mesh
located
is
just
of
the
storage
mesh
of
a dielectric
on
the
is
called
causes
and
the
mesh
capacitive
-10
are
repelled
explanations
understanding
.
(figure
the
is
an
capacitive
is
volts.
4-1)
storage
the
mesh.
phosphor.
just
its
cathode.
shaped
the
is
a conductive
l section
electrically
behind
mesh
covered
outside
the
storage
storage
held
coupling,
In
and
contains
tube
CRT
flood gun), flood
These
are
located between
outside
Its
and
collimator
of
the
the
storage
makes
It
is
an
with
material.
surface
coupling between
surface.
at
about
the
this
condition,
collected
SECTION IV
explanation
and
storage.
of
Model
and
schematics,
AND
STOR-
are
pro-
of
the
a con-
gun
and
an
The
conven-
is
called
contains
function is to
The
accel
CRT
transparent
electrically
of
surface. The
storage
the
storage
the
write
electron
erated
and
the
coating
glass.
mesh.
storage
a special
Storage
the
coat-
In
opera
+4
volts.
sur-
the
by
the
of
to
a
-
OF
OPERATION
4-9.
The
discussion
sumed
write gun is now
energy
strikes
trons
off
electrons
ever
surface, the
loss
more positive, flood
strike
the
(and
4-10. SECONDARY EMISSION RATIO .
4-11.
curve
ratio
storage
the
electrons
ber
over
more electrons
of
than
4-1
4-
of
erase
mesh
storage
areas
is
are
mesh
released
dropped
timing
RC
14
+
mesh
face
erase
returned
applied
Model 1331A.
that
th e write gun
is
much higher
the
storage
already
(secondary emission).
are
collected
the
write
gun
potential
of
electrons. Because
the
phosphor
pattern
stored)
storage
arriving
the
leaving,
2. ERASE CYCLE .
13.
the
pressed,
brought
, + 1
charging
volts.
to
10
volts. All
traced
on
Figure
of
is
point
storage
Figure
potentials
cycle.
is held
are
period
and
timing
4-2
the
storage
the
basis
surface
surface.
leaving
is
the
are
surface
the
4-3
Prior
at
surface
near
the
to
58
volts. When
both
storage
to
approximately-12
of
action
Capacitive
the
storage
follow
to
to
and
period,
+4 volts
these
the
storage
in
the
turned
on
the
and
called a crossover point.
secondary
to
+4
are
0 volt. When
storage
the
approximately
on, the electron
surface
the
storage
by
electron
at
gun
electrons
viewing screen.
by
the
storage
is
the
surface.
for
storage
for
erasure
The
the
storage
leaving
rises;
potential
graphica
on
the
initiation
volts.
at
-10
mesh
same
mesh
brings
coupling between
surface
rise to 0 volt.
the
and
actions
mesh
previous
was turned
than
with
The
the
collector
beam
that
point
these
write
surface.
secondary
The
of
point
where
surface
emission
than
arriving,
when
decreases.
lly
shows
storage
of
The unwritten
volts
the
and
potential as
the
ERASE
and
.5 volts.
the
causes
storage
the
are
caused
by
paragra
the
flood electrons)
suc
h force th
surface
secondary emission
strikes
rises
points
pass
In
gun
beam
emission
secondary
information
of
information
the
equals
ratio
more
the
surface during
the cycle,
and
ERASE pushbutton
the
storage surface
pushbutton
storage
During
800 milliseconds,
storage
the
At
the
mesh
storage
by
the pul
ph
off.
If
beam
(whose
at
elec-
are knock
mes
h. Wher-
the
storage
due to
have
become
through
this
manner,
is
written
ratio
emission
on
from
number
the
num-
At
a cross-
= 1.
When
the
potential
are
arriving
variations
the
storage
areas
of the
the
writte
the
collector
surface
an
erase
mesh
up
the
storage
storage
end
of
potential
surface
waveforms
se circuits
as-
th
ed
the
and
the
of
the
is
are
an
to
sur-
the
is
to
in
e
n
4-1
Theory
Model 133
1A
4-14.
After
the
erase
cycle,
previously
formation
is
ready
(with
storage
where
pass
phor
post
4-15. VARIABLE PERSISTENCE.
4-16.
in
the
on
the
persistence would
Model 1331A does
it
uses a
varied.
method
all
information
there
the
has
to
store
much
higher
surface
they
strike
through
these
viewing
accelerator.
It
is possible
CRT
so
phosphor
method
Variable
of
removing
until
the
natural
storage
been
removed
new
information.
than
crossover
in
a positive direction
the
storage
areas
and
screen
that
by
to
disable
the
write
viewing
depend
not
use
that
permits
the
gun
surface.
only
persistence
stored
written
ERASE
on
the
pushbutton
time
(in excess
and
surface. Flood electrons
are
high
on
this
CRTs
information;
storage
elapses.
4-17.
Figure
persistence
shows
The
that
shaded
unwritten
In
the
write mode,
the
storage
increased
tively
While
at
of
the
storage
electrons.
written
storage
ward 0 volt.
mesh
returns
face
drops
surface
return
to a
initial
the
and
is
potential.
ability
capture
slightly
4-18. A train
written
4-4.
The
by
varying
effect, noticible
background
mesh
is pulsed positive, flood electrons
all
areas
screen,
4-19. STORAGE.
4-20.
to
the
even
In
storage
4-4
is
obtained.
the
area
and
written
mesh
this
increased
surface
This
areas
because
mesh
and
At
to
10 volts.
return
to
potential
of
the
flood
reduced.
of
trace
as shown
persistence
the
glow
of
the
ly
exciting
store
mode,
mesh,
graphically
storage
shows
areas
short
and
the
10 volts
for
The
mesh
the
erase
storage
the
shows
left
potential
of
potential,
attract
tends
to
the
the
end
its
normal
The
unwritten
-10
slightly
This
decrease
post
gun
electrons,
erase
by
of
repetition
under
and
lower
the
capacitance
storage
of
the
level
volts
and
more
accelerator to
pulses
the
some
gradually
the
shaded
written
rate
of
conditions,
on the CRT. While
mesh
to
the
entire
erase
and
persistence
the
pulses
written
the
storage
Write
gun
energy)
only
charge
in
pulled to
potential
the
storage elements
beam
writes directly
In
such
the
type
phosphor.
mode
of
operation;
the
persistence
require
otherwise,
surface
is
pressed
of
15
how
side
of
the
is
fixed
at
of
the
storage
pulses
duration
surface
the
ciwture
the
are
applied
is
of
the
written
flood
potential
between
surface
pulse,
and
areas
negative
in
charges
the
the
storage
of
the
written
potential
the
than
reach
and
trace
brightness
erases
areas
trace
the
pulses. A side
is a light
the
pass
phosphor
surface.
are
not
(store time)
in-
surface
electrons
the
the
areas
the
phos-
on
the
a mode,
to be
some
remains
or
until
minutes)
variable
graph
+4
volts.
both
the
surface.
to
capaci-
pulse.
areas
gun
of
the
the
to-
storage
sur-
storage
areas
their
reduces
through
the
in
figure
is
varied
storage
through
viewing
app
lied
is
iimited
This
ionization
electrons.
positive
phosphor
ground
positive
mode
for
4-21. STORAGE PRECAUTIONS.
4-22.
surface,
tential.
verted
pation
electric
trace blooming.
should
ing
primarily
occurs
The
and
illumination
is
by
brief
periods
When
they
The
to
heat
rating
material.
always
occurs.
by
an
effect called
on
the
of
residual
storage
storage
surface
gas
surface
molecules
gradually
allows flood electrons to
viewing
reduced (
keeping
area
until
and
the
to
refresh
write
gun
cause a very
energy
and,
of
the
from
when
storage
The
The
intensity
be
set
below
where
the
display
store
time
flood
gun
the
electrons
this
it
exceeds
burning
the
display.
rapid
sudden
surface,
and
by
penetrate
they
increase
is obscured.
increased) in
turned
strike
increase
change
the
action
level
of
point
fade
positive.
is
caused
flood
charges
off
the
heat
burns
is
visible
the
write
where
by
gun
more
to
the
back-
Fade
stor
except
storage
in
po-
is
con-
dissi-
the
di-
as
gun
bloom-
e
4-23. BLOCK DIAGRAM DISCUSSION.
4-24.
This
discussion
the
circuit
on
the
4-25. LOW VOLTAGE POWER SUPPLIES.
4-26.
blocks,
puts
+12.5V,
and
to it.
4-27.
4-28.
high
volts for:
volts for
post
ment,
high
trols
by
controlling
4-29. X- AND Y-AXIS AMPLIFIERS.
4-30.
and
groups
overall
This
block
block provides power to
including
at
four
de
and
+158V.
all
the
other
The
+ 12.6V
HIGH
VOLTAGE POWER SUPPLY.
The
high
voltage
the
the
potentials
write
write
accelerator.
hv
adj,
and
voltage
the
power
intensity
The x-and
serve to drive
deflection plates.
trols
are
included
and
phase
shift
illust
(blocks) to
diagram,
the
high
voltages
low
supply
voltage
The
voltage
is
are
-50V
power
to
gun
cathode,
gun
grid, and
The
write
the
FOCUS
supply.
and
blanking
the
voltage
y-axis
amplifiers
the
CRT
POSITION
in
these
adjustment.
rates
the
each
other.
figure 4-6.
voltage
power
supplied: +50V,
supply
supplies
also
adjustable.
supply
operate
the
approximately
+7.5 kilovolts
gun
intensity
control
The
gate
functions
to
the
write
are
horizontal
and
BEAM
blocks
as
well
relationships
It
is
based
all
the
oth
supply.
Out
-50V,
is
adjustable
are
referenced
provides the
CRT:
-2915
-29
for
limit
adjust-
are
part
of
amplifier con-
of
the
CRT
gun
grid.
nearly
identical
and
vertical
FIND
con-
as
the
gain
of
er
55
the
the
-
)
4-2
Th
eory
WRITE
GUN
FLOOD
GUN
AQUA
DAG
COLLIMATOR
Figur
STORAGE
MESH
STORAGE--:--:
SURFACE
COLLECTOR
MESH
e 4-1.
CRT
+158
+
154
iii
t-
+
144
~
::?
x
0
a:
~I
+14
:!
+
10
w
(!)
~
+4
t-
_J
0
0
>
- 5
-
10
-
14
POST
ACCELERATOR
:i
I
1 :
I O
I O
I O
I 0
I a
•
•
Schematic
PRESS
ERASE
J
I
-
PHOSPHOR
VIEWING
SCREEN
1331A-A-12
RELE
SE
ERAS
i----1---
/ :
"'~
1.2
SEC
----<ot•
....
--
-----
----
'I/ :
,'
0
i=
~
a:
z
0
(/)
(/)
::?
t~
a:
~
0
~ -o+--+4~0
(.;
w -
"'
Figure
I
I
I
I
I
I
I
I
I
I
I
I I
1
~/
lr
~
I
---
--
h I I I
---
STORAGE
4-2.
Secondary
1
STORAGE
POTE
----
--
,
STORAGE
POTENTIAL
~-----.L-
~CROSSOVER
J
-- ---~---
+-1~5-8
_____
MESH
POTENTIAL
MESH
NTIAL
SURFACE
----
-----t -
+_1_4._4
IN
Emission
1331A-A-14
1
I
0
VOL
1331A-A-13
Ratio
TS
+
14
+
10
w
t-
~
+5
::?
x
+4
0
a:
a..
0
t~
w
(!)
~
~
- 5
0
>
-
10
Figure
Figure
4-4. V
aria
4 .
Erase
le
Persistence
Cycle
Pulsing
STORAGE
POTENTIAL
STORAGE
P
OTENTIAL
MESH
SURFACE
1331A-A-15
4-3
(
(
Model 1331A
4-31.
Z-AXIS
4-32.
The
current
mitting
4-33.
4-34.
INTENSITY
Intensity
intensity
control,
and the bl
three inputs
drive
the
of
the
blanking
other
inputs. The
ra
ng
e to drive the CRT between co
maximum
4-3
5.
CONTROL
4-36. The
and
STORE),
determine
and
determine
functions
cept
store
loc
ated on
4-3
7.
PU L
4-38.
The
timing
signals
pulse circuits
4-5. The
the
control
forms a
variable
transistor
shown
gates.
will
HI.
on
If
be
LO;
HI and
positive
designated
in
the
circuit.
AMPLIFIER.
z-axis
gain
external
gate:
the
anking
input
amplifier
required to
intensity
GATE.
is
controlled
the
de
dynamic
signa
are
summed
to
the
output
signal
gate
amplifier
brightn
control
ess.
CIRCUITS
circuits
initiate
persist
ence
of
store
time
are
controlled
time
adj,
which
the
program
SE
CIRCUITS
pulse circ
inputs
circuits
nd
de voltag
persist
switches
the
any
if
block
input
uits
for
the
mode
are
shown
are analog
and
es
ence
elements
function
diagrams
to a NOR
all
inputs
LO refer to logic
of
two different logic l
are
probably
provides
drive
the
control
by
output
from
from
l from
the
in the
gate
amplifier.
is
large enough
.
determine
the
erase
the
display
(store
by
front
is
an
board, A6.
.
provide
and
in
greater
and
digital
the
outputs are
to control
of
as
as
gate
are
LO,
states.
different
the
voltage
intensity
gate,
(z-axis modulation
three
inputs
the
INTENSITY
the
z-axis amplifier,
pul
se
circuits.
input
circuit
The
amplitude
to override
provides the
mplete
mode
dynami
cutoff
(WRITE
cycle (ERASE),
(PERSISTENCE),
time
adj). All these
panel
controls ex-
internal
the
erase
adjustment
operating and
fun
ctions.
detail
in
commands
tim
ed wave-
the
storage
the
CRT.
Some
logic c
ircuits and
NOR
(negated
is HI, the
the
HI
eve
ls.
at
different
output
The
output
will be
is the
voltages
and
per-
to
the
The
and
the
and
The
figure
from
and
of
the
are
OR)
more
points
4-39. Write Mode. See figure 4-5A. A write
mmand
co
invert
outputs
The
flood
from
the
flood
gun
4-40.
the blan
gate causes
(LO) is
er.
The
from
LO
output
gun
switch
the
pulse generator
flood
gun
gun
switch
on.
The
LO
king
app
HI output
the
write
from
in
switch) a
to
go
output
gate.
The
an
unblanking
lied
the
two
nd caus
HI.
from
HI
on
the
of the
invert
gate and
flood
gun
ways:
it
(no
pulses
es
This
turns
the
write
output
command
mode
input
er
flood
gate
inhibits
pass
the
output
the
gate
from the
(LO) to be
to
causes
gun
gate.
affects
the
input
through
of
CRT
flood
activates
blanking
the
LO
the
the
app
lied by
gate
also enabl
from
on
the
and
storage
).
4-41.
ma
nd
verter.
HI
output
-42. The
4
the pulse
The
c
th
e C
4-43.
outp
ut
the
blanking
(HI) to
blanking
causing
ax
is amplifier.
the
write
4-44.
put
of
the
pulse
hibited
of
the
c
lamped
to
apply
4-46. Erase Function. See figure 4-5C. Before
e
rase
button
pushbutton
the stor
storage
4-46.
is
manually
limit
During
circ
uits
is applied directly to
ure 4-3 a
app
lied to
ca
pacitor to
RC
timing
storage
c
harged
Prime
47.
4-
+ 158 volts is removed a
gin.
period a
erase
the
amplifier.
es
the
the
pul
se
output
of
The
LO
storage
generator
the
gate;
off. The resultant
erase
circuit to
Store Mode.
(HI) is
The
LO
from
HI
generator
flood
gun switch
RT
flood
The
HI output
of
the
amp
the
gate
gate
-49
volts to be
gun
The HI output
the
storage
generator
and
the
storage
in
the
+3.5
vol
function
must
be
applies
age
erase
See
app
lied on
output
the
output
from
write
from
input
appli
gun
accel
erator.
from the
blanking
gate
lifi
er
to apply a blanking command
amplifier.
also
operates
applied
This
deflects a
away
from
of
the
gate
to go LO.
input
pulses
gate.
LO
ts
can
do
The
outp
state caus
to
the
CRT
be
activate
pressed. When pressed,
+ 158 volts to
circuit, a
mes h.
Th
e time
set
during
closed
for
prime time; it
is
which
called
prime time, + 158 volts is
to accom
nd
erase
in
time is
When the
plish
paragraph
the
erase
be
charged
action.
Third
circuit;
this causes a capacitor
preparation
indicated
ERASE
thr
the
CRT
4-13). Second, +158
timing
in
, +158 volts
for
in
figure 4-5C
nd
These
ppr
timing
timing
oxim
ate
period is
actions create
ly 800 milliseconds long. The
indi
blanking
output
from
this permits
to
turn
pulses
are
the
CRT
figure 4-
the
gate
the
to
es
5B. A
mode i
the
inverter
and
flood
the
flood
the
amplified pulses to
write
to go LO.
The
LO
the
to
ny
stray
the
target
write
gate cau
In
to
the
storage
not
appear
ut
of
the
ing
the
stora
ge
d, the WRITE
the
nd
directly to
the
ERASE
prime
depends
applied
ee
act
ions.
storage
circuit;
preparation
another RC
pushbutton
the
RC
timing actions be-
cated
in
amp
the
the
storage
applied
storage
nput
lifier to
write
the
store
pulses
through
mesh.
to
the
the
gate
gate
com-
in-
causes
flood
gun
gate
gun
gate
enables
gun
switch.
gate causes
This
output
the
causes
of the
deflector switch,
one
side
of
the
elec
trons
from
area
of
the
CRT.
ses
the
out-
this condition
gate
is in-
at
the output
storage
storage
gate
switch
mesh.
the
push-
the
ERASE
erase
switch,
the
CRT
pushbutton
time. There
on the
First,
mesh
this
for
is
applied
is
operator
to
the
pulse
+ 158 volts
(see fig-
volts
causes
the
basi
to the
no
is
to be dis-
timing
as
time
action.
period A.
is released, the
an
erase
timing
figure 4-5C
as
a
.
x-
,
is
.
a
c
time period C.
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