HP 1331A Service manual

U PERATI l\IG AND S E RVIC E MANUAL
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ODEL 1331A
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CERTIFICATION
Th e He wlett-Packard Company certifies that this instrument was
thoroughly tested and inspected and found to meet its published
specifications wh
en it was shipped from the factory. Th e Hewlett-
Packard Company further certifies that its calibration measure-
ments
are traceabl e to the U.S. National Bur eau of Standards to
the extent allowed by the Bur eau's calibration facility.
WARRANTY AND ASSISTANCE
This Hewlett-Packard product is warranted against defects
in materials and workmanship. This warranty applies for
one year from the date of delivery, or, in the case of certain
major components listed in the operating manual, for the
specified period. We will repair or replace products which
prove to be defective during the warranty period provided
they are returned to Hewlett-Packard. No other warranty
is expressed or implied. We are not liable for consequential
damages.
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Service contracts or custoµier assistance agreements are
available for Hewlett-Pa~kard products that require main-
tenance and repair on-site.
For any assistance, contact your nearest Hewlett-Packard
Sales and · S~rvice Office. Addresses are provided at the
back of this manual.
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OPERATING AND SERVICE MANUAL
MODEL 1331A
X-V DISPLAY
SERIALS PREFIXED: 1319A
Refer to Section VI I for instruments wit h other Serial Prefi xes.
Refer to Section VII for instruments with the following
standard options:X95,631.
HEWLETT-PACKARD COMPANY/COLORADO SPRINGS DIVISION
1900 GARDEN OF THE GO DS ROAD , COLORADO SPRINGS , CO LORADO , U.S .A.
ManualPartNumber01331-90903.
MicrofichePartNumber01331-90803.
PRINTED: MAY 1973

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Table of Co ntents
Model 1331A
TABLE OF CONTENTS
Section P
age
I
II
III
IV
11
GENERAL INFORMATION ..... . .. .... . 1-1
1-
1. Introdu ction . . . . .. . . . .. . . . . .. . . .. 1-1
1-
4. Description . . . . . . . . . . . . . . . . . . . . . . 1-1
1-10. Cathode-ray Tube ................ 1-1
1-1
2. Warranty .... .... ............ ... . 1-1
1-14. Available Accessories. . . ... . .... . 1-1
1-16. Instrument and Manu al
Identifi
cation . . . . . . . . . . . . . . . . . . 1-1
1-20. Inquiries. ........ .. ... . .......... 1-3
INSTALLATION. .... .. ... . .... .. ... . ... 2-1
2-1. Introdu ction .................... .
2-3 . Initial Inspection ............... .
2-5 . Preparation for Use .. . .... . ... . . .
2- 7. Rack Mounting ........... .. .. .
2-9. Power Re quirements ....... . .. .
2-11. Power Connections ............ .
2-13.
Instrum e nt Cooling ........... .
2-17. Monitored Inputs ........... . . .
2-19. Amplifier Input Modifications . .
2-34. Claims . ....... ... .............. . .
2-36. Repacking for Shipm e nt ... . .... .
OPERATION ... .... .. ... . ......... . .... .
3-1. Introduction ... .. ..... . .. . . .... . .
3-3. Controls and Connectors . ....... .
3-5. Beam Find . ... ................ .
3
-7. Intensity ..................... . .
3-9. Applications ..... . ......... . .... .
3-11. Preoperational Adjustments and
Operator's Checks . .. ........ . .
3-13. Operator's Maintenanc e ... .. .. .. .
3- 15. Operating Procedur es ........... .
PRINCIPLES OF OPERATION ....... . . .
4-1. Introdu ction .................... .
4-3. Variable Persistence and Storage .
4-5. The Storage CRT ............. .
4-10. Secondary
Emission Ratio . .. . .
4-
12. Erase Cycle ................... .
4-15 . Variable Persistence . . .... . ... .
4-19 . Storage ....... ... . .... . ....... .
4-21. Storage Precautions ... . ....... .
4-23. Block
Diagram Discussion ..... .
4-25. Low Voltage Power Supplies . . .
4-27. High Voltage Power Supply ... .
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- 2
3
-2
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
Section
Page
v
4-29.
4-31.
4-33.
4-35.
4-37.
4-54.
4-56.
4-64.
4-71.
4-76.
4-78 .
4-82.
X- and Y-axis Amplifiers . . . .. . . 4-2
Z-axis Amplifier . . . . . . . . . . . . . . . 4-3
Int e nsity Gat e . . . . . . .. . . . .. . . . . 4-3
Control Circuits................ 4-3
Pulse Circuits .. . . . . . . . . . . . . . . . . 4-3
Detailed Circuit Theory . . . . . . . . . . 4-4
Low Voltage Power Supp li es . . . 4-4
High Voltag e Power Supply . . . 4-5
X- and Y-axis Amplifiers ......... 4-5
Z- axis Amplifier . . . . . . . . . . . . . . . 4-5
Control Circuits . . . . . . . . . . . . . . . . 4-5
Pulse Circuits. . . . . . . . . . . . . . . . . . 4-6
PERFORMANCE CHECKS AND
ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . 5 -1
5- 1. Introduction . . . . . . . . . . . . . . . . . . . . . 5-1
5 -5. Performance Check . . . . . . . . . . . . . . 5 -1
5-8. Mode and Erase Checks. . . . . . . . 5- 2
5- 12. Deflection Checks.......... .... 5 -2
5- 16. Phase Shift Check . . . . . . . . . . . . . 5-2
5-2
0. Common Mode Rejection Ratio
(CMRR) Check . . . . . . . . . . . . . . . 5-2
5-2
4. Bandwidth Checks . . . . . . . . . . . . . 5 -3
5-28. Z-axis Amplifier Checks. . . . . . . . 5 -3
5-32. Erase Time Check . . . . . . . . . . . . . 5-4
5-3
6. Dot Writing Time Check . . . . . . . 5-4
5-40. Store Time Check . . . . . . . . . . 5-5/5-6
5 -44. Adjustment .... . . .. .... . ..... .... 5 -7
5-47. Low Voltag e Power Supply
Adjustments . . . . . . . . . . . . . . . . . 5-7
5-5
1. High Voltage Power Supply
Adjustment.. ............. .. . 5-7
5-55. Write Depth
Adjustment . . . . . . . 5- 7
5;5 9. Flood Gun a nd Collimator
Adjustments . . . . . . . . . . . . . . . . . 5 -8
5-63. Write Gun Intensity Limit
Adjustment . . . . . . . . . . . . . . . . . . 5 -8
5-67. X- and Y-axis Amplifier Gain
Adjustment ............... . .. 5-8
5- 71. Phase Shift Adjustment . . . . . . . . 5-8
5
-75. Writing Rate Adjustment ....... 5 -9
5-79. Store Time Adjustment.. . . ..... 5 -9
5-83. Z-a xis Amplifier Risetime
Adjustment. . . . . . . . . . . . . . . . . 5-10
5-87. Calibrating Modified
Instruments . . . . . . . . . . . . . . . . . . 5- 10
5-89. Phase Shift. ........ . ......... 5-10
5 -91. Attenuator Compensation..... 5-10
5-93. Input Signal Amplitudes . . . . . . 5-11

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Model 1331A
Table of Contents
List of Illustrations
TABLE OF CONTENTS (Cont'd}
Section
Page
VI
REPLACEABLE PARTS
6-1
6-1. Introduction . . . . . . . . . . . . . . . . . . . . . 6-1
6-3. Ordering Information . . . . . . .. . . . . 6-1
VII MANUAL CHANGES AND
OPTIONS......................... 7-117-2
7-1.
7-3.
7-7.
7-11.
Introduction ................ .
Manual Changes ............ .
Special Options ............. .
Standard Options ........... .
VIII SCHEMATICS AND TROUBLE-
7-117-2
"7-117-2
7-117-2
7-117-2
SHOOTING .. .. .. . .. .... .. .. .. .. .. .. .. 8-1
8-1. Introduction . . . . . . . . . . . . . . . . . . . . . 8-1
8-3. Schematics . . . . . . . . . . . . . . . . . . . . . . 8-1
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 Designations . . . . . . . . . . 8-1
Component Locations ............ 8-1
Preventive Maintenance . . . . . . . . . 8-1
Mechanical Inspection . . . . . .. . . 8-1
Cleaning.... ................... 8-1
Switch Maintenance . . . .. . . . . . . 8-2
Repair and Replacement . . . . . . . . . 8-2
CRT Removal and Installation . 8-2
Semiconductor
Removal and
Replacement..... ............ 8-3
Circuit Boards . . . . . . . . . . . . . . . . . . . 8-3
Board Connections. . . . . . . . . . . . . 8-3
Servicing Etched Circuit
Boards ....................... 8-3
Heat Sinks... .................. 8-3
Troubleshooting . . . . . . . . . . . . . . . . . 8-3
DC Voltages ................... 8-3
Waveforms
.. .. .... .. . .. .... .. . 8-3
Trouble Isolation. . . . . . . . . . . . . . . 8-3
LIST OF ILLUSTRATIONS
Figure Title Page
1-1.
Model 1331A X-Y Display ......... .... 1-0
1-2. Instrument Serial Number ............
1-3
2-1. Rack Mounting .......................
2-1
2-2. Ventilation Tolerances ............... .
2-2
2-3. X-Y Amplifiers Input Circuit ..........
2-4
2-4. Attenuator Components Locations on
Main Board A5 .....................
2-4
3-1.
Model 1331A Contro ls and Con-
nectors
............................. 3-3
3-2.
Preoperational Procedure ..............
3-4
3-3.
Genera l Operating Procedure ..........
3-5
3-4.
Multiple Display Procedure ............ 3-6
4-
1.
CRT Schematic ....................... 4-3
4-2. Secondary Emission Ratio
............ 4-3
4-3. Erase Cycle ...........................
4-3
4 -4.
Variabl e Persistence Pulsing .......... 4-3
4-5. Pulse Circuits Block Diagram .........
4-5
4-6. Overall Block Diagram ............
4-7 / 4-8
5-1.
Phase Shift Tr ace ..................... 5-3
5-2.
Erase Waveform ...................... 5-4
5-3. Write Depth Waveform ................
5-7
5-4. Adjustment Locator ............... 5-11/5-12
8-1. Al Component Locator ................ 8-4
8-2. A2 Component Locator ................ 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
Page
Schematic, ±50 V Power Supplies 8-5
Semiconductor
Terminal Iden-
tification. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-7
Schematic, +158V and +12.6V Power
Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-7
A3 Component Locator ................ 8-8
A4
Component Locator. . . . .. . . . . . .. . . . 8-8
A7
Component Locator. . . . . . . . . . . . . . . . 8-8
Schematic 3 Measurement Conditions
and Waveforms............ .... 8-9/8-10
Schematic, High Voltage Power
Supply .......................... 8-9/8-10
Schematic 4 Measurement Conditions
and Waveforms. .............. 8-1118-12
Schematic, X- and Y-axis
Amplifiers . . . . . .. . . . . .. . . . .. . . . 8-11-8-12
Schematic 5 Measurement Conditions
and Waveforms... ................. 8-13
Schematic , Z-axis Amplifier ......... . 8-13
A6 Component Locator............... 8-14
A8 Component Locator............... 8-15
Schematic, Control Circuits . . . . . . . . . . 8-15
A5
Component Locator ............... 8-16
Schematic,
Pulse Circuits . . . . . . . 8-17/8-18
Write Mode Troubleshooting
Guide......................... 8-19/8-20
Store Mode Troubleshooting
Guide. . . . . . . . . . . . . . . . . . . . . . . . . 8-21/8-22
Erase Function Troubleshooting
Guide.............................. 8-23
111

List of Tables
lV
LIST OF TABLES
Table Title Page
1-1. Specifications......................... 1-2
1-2. Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1-3. Reference Designations and
Abbreviations....................... 1-3
2-1. X-Y Attenuator Component
Values............ .................. 2-3
2-2. Attenuator Components Parts List . . . . 2-3
2-
3. Z-attenuator Component Values .. . . . . . 2-3
3-1. Definitions............................ 3-1
5-1. Recommended Test Equipment........ 5-1
Performance Check Record . . . . . . 5-6a/ 5-6b
5-2. Low Voltage Power Supply
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . 5-7
6-1. Abbreviations for Replaceable
Parts List........................... 6-1
6-2. Replaceable Parts . . . . . . . . . . . . . . . . . . . . . 6-2
6- 3. List of Manufacturer's Codes.... 6-11 /6-12
8-1. Schematic Notes...................... 8-6
Model 1331A
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Genera l I nformation
Model 1331A
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1331A-A-7
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Figure 1-1. Model 1331A X-Y Display
1-0

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Model 1331A General Information
SECTION I
GENERAL INFORMATION
1-1. INTRODUCTION.
1-2. This manual provides operating and servicing
information for the Hewlett-Packard Model 1331A
X-Y Display (figure 1-1). The manual is divided into
eight sections, each covering a specific topic or as-
pect of the instrument. All schematics are lQcated at
the rear of the manual and can be unfolded and
used for reference while reading any part of the
manual.
1-3. This section contains a description of Model
1331A.
The instrument specifications are listed in
table 1-1. Table 1-3 lists and describes the abbre-
viations used everywhere in this manual except in
Section VI. The parts list in Section VI is a com-
puter printout and uses computer-supplied abbrevia-
tions. Special accessories are listed in this section.
Standard options available for this instrument are
listed and described in Section VIL
1-4. DESCRIP TI ON.
1-5. Model 1331A has been designed for general-
purpose X-Y storage and system monitoring. It can
display digital or analog computer-processed data or
real time information. Its high frequency response
makes it useful as a read-out device in the following
applications:
graphic and alphanumeric displays,
nuclear spectrometer, semiconductor curve tracer,
swept-frequency
measurements, frequency ratios,
phase shift measurements, raster displays , and ampli-
tude versus time displays.
1-6. Identical X and Y amplifiers provide storage
monitor displays with bandwidths up to 1 MHz. Re-
fresh memory requirements are minimized by the
mesh type storage CRT.
1
-7. All controls required to compensate for spot
deflection and dot writing speed are located on the
front panel. These include FOCUS , INTENSITY, PER -
SISTENCE, mode (WRITE, and STORE), POSITION
controls, and ERASE.
1
-8. Model 1331A writes and stores shades of gray
which adds a third dimension to the display. Spot
blanking is obtained with-IV. Maximum brightness
is obtained with +1V. In-between voltages provide
shades of gray.
1 -9 . Model 1331A is proportioned to permit mount-
ing two instruments (any HP 1330/1331-series instru-
ments) side-by-side in a standard 19-inch rack. Refer
to
the paragraph on available accessories in this
section for a description of a suitable rack adapter.
1-10. CATHODE-RAY TUBE.
1-11. Model 1331A uses a post-accelerator storage
CRT with a 10.5 kV accelerating potential and alum-
inized P31 phosphor. The 8 x 10 division internal
graticule is located on the same plane as the display
to eliminate parallax errors. The mesh type storage
used eliminates the need for memory devices to con-
stantly refresh the display. Refer to table 1-1 for
complete
CRT specifications.
1-12. WARRANTY.
1-13. The instrument (except the CRT) is certified
and warranted as stated on the inside front cover
of this manual. The CRT is covered by a separate
warranty. The CRT warranty and warranty claim
form is located at the rear of this manual. Shou ld
the CRT fail within the time specified on the CRT
warranty page, complete the warranty claim form and
return it with the defective CRT. The procedure for
returning a defective CRT is described on the CRT
warranty page.
The warranty may be void for instru-
ments having a mutilated seria l number
tag.
1-14. AVAILABLE ACCESSORIES.
1-15. Accessories availab le for use with Model 1331A
are listed in table 1-2. Hewlett-Packard also has
a wide range of test equipment and accessories suit-
able for use with HP instruments and instruments
of other manufacturers. Refer to the latest HP Catalog
or request information from the nearest HP Sales /
Service Office.
1- 16. INSTRUMENT AND MANUAL IDEN-
TIFICATION.
1-17. This manual applies directly to Model 1331
instruments with a serial prefix number as listed
on
the manual title page . The serial prefix number
is the first group of digits in the instrument serial
number (figure 1-2). The instrument serial number
is on a tag located on the rear panel.
1-1

General Information
Model 1331A
Table 1-1. Specifications
VERTICAL AND HORIZONTAL AMPLIFIERS
BANDWIDTH: de to 1 MHz (3 dB down at 1 MHz).
PHASE SHIFT: <1 ° to 0.5 MHz.
SETTLING TIME : Signa l settles to within 1 spot di-
ameter of final va lue in <1 µsec for any on-
screen movement.
DEFLECTION FACTOR
Vertlcal: 1V
for 8 div deflection. In terna ll y ad-
justable from 0.09 V/ div to 0.14 V/ div.
Horizontal: 1V for 10 di v deflection. Internally
ad ju stable from 0.09 V/ div to 0.14 V/ div.
COMMON MODE REJECTION RATIO: 40 dB to 10
kHz for differential input of 3V m aximum be-
tween outer and inn er coaxia l input l ea ds.
MAXIMUM INPUT: ±5 0V (de + peak ac).
INPUT: differentia l between center conductor and
shie ld, shield may be gro und ed wi th internal
connection.
INPUT RC
Single Ended: lOOk ohms s hun ted by approx 80
pF to ground.
Differential: 200k ohms sh unt ed by approx 80 pF.
RECOMMENDED SOURCE IMPEDANCE: <20ko hms
between ce nter conductor and shield; < lk ohm
from shield to ground.
Z AXIS AMPLIFIER
BANDWIDTH : de to >5 MHz; risetime, approx 70 ns.
INPUT RC
Single Ended: lOk ohms shunted by approx 60 pF
to ground.
Differential: 20k ohms sh un ted by approx 60 pF.
IN PUT: -1 Vb lanks spot of any in tensity;+1V turns
beam full on.
MAXIMUM INPUT: ±lOV (de + peak ac).
RECOMMENDED SOURCE IMPEDANCE: <20k
ohms
between center conductor and shield; <lk ohm
from shie ld to ground.
CATHODE-RAY TUBE AND CONTROLS
1-2
TYPE: post-accelerator storage tube 7.5 kV acce l-
era ting potentia l, al uminized P31 phosphor.
GRATICULE: 8 x 10 div internal graticule. 1 div=
0.95 cm. Subdivisions of 0.2 div marked on major
axis.
WRITING SPEED: >20
div / ms.
DOT WRITING TIME: <4 µsec.
DISPLAY LINEARITY
Horizontal: <5% difference between any two div.
Vertical: <5% difference between any two div.
INFORMATION STORAGE RATE : 200 thousand
dots per seco nd .
BRIGHTNESS: >100 foot lamb erts.
STORAGE TIME
Writing Mode: 1 minute min.
Store Mode:15 minutes min .
VARIABLE PERSISTENCE: variable from 0.2 secto
1 min.
ERASE TIME : <l sec.
BEAM FINDER : returns beam to screen regardless
of setting of X and Y position con trols. Rear
panel switch.
GENERAL
POWER : 115V or 230V ±10%, 48 to 440 Hz, approx
60W.
WEIGHT: net, 19-112 lb (8,85 kg); shipping, 25 lb
(11,34 kg).
DIMENSIONS: Refer to outline drawing.
NOTE1
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