Tektronix 7D20 User manual

7iel~ronoc
WARNING
COMMffTED TO EXCELLENCE
THE FOLLOWING
SERVICING
INSTRUCTIONS
AREFORUSEBY
QUALIFIED PERSONNEL
ONLY .
T O AVOID
PERSONAL INJURY,
DO NOT
PERFORM ANY
SERVICING
OTHERTHAN THAT
CONTAINED
IN OPERATINGINSTRUCTIONS
UNLESS YOUARE
QUALIFIED TO DO SO .
REFER
TO
OPERATORS
SAFETY SUMMARY
AND
SERVICE SAFETY
SUMMARY PRIOR
TO
PERFORMING ANY
SERVICE .
PLEASE CHECK
FOR CHANGE
INFORMATION
AT THE REAR OF
THIS MANUAL .
7D20
PROGRAMMABLE
DIGITIZER
WITH OPTIONS
SERVICE
INSTRUCTION
MANUAL
Tektronix, Inc .
P
.O .
Box 500
Beaverton, Oregon

97077

Serial Number
070-3858-01

First Printing JUL 1982
Product Group
42

Revised JUL 1985

Copyright ~
1982 Tektronix,
Inc . All rights reserved
.
Contents of
this publication may
not be reproduced
in any
form without
the written permission
of Tektronix, Inc .
Products of
Tektronix, Inc . and its
subsidiaries are covered
by U .S . and foreign
patents and/or
pending patents .
TEKTRONIX, TEK,
SCOPE-MOBILE, and

are
registered trademarks
of Tektronix, Inc .
TELEQUIPMENT
is a registered trademark
of Tektronix U .K
. Limited .
Printed in U .S .A .
Specification and price change
privileges
are
reserved .
INSTRUMENT
SERIAL NUMBERS
Each
instrument has a serial number on a
pa~iel insert, tag,
or stamped
on the chassis . The
first number or letter
designates
the country of manufacture .
The last five digits
of the
serial number are assigned sequentially
and are
unique to
each instrument . Those
manufactured in the
United
States have six unique digits .
The country of
manufacture is
identified as follows :
8000000

Tektronix,
Inc ., Beaverton, Oregon, USA
100000

Tektronix
Guernsey, Ltd ., Channel Islands
200000

Tektronix
United Kingdom, Ltd ., London
300000

Sony/Tektronix,
Japan
700000

Tektronix
Holland, NV, Heerenveen,
The
Netherlands

SEND TO :

TEKTRONIX,
INC
.

7D20
PROGRAMMABLE DIGITIZER
LAB SCOPES
SOFTWARE MAINTENANCE
P.o . BOX 500 DEL
. STA . 39-285

SOFTWARE/FIRMWARE
BEAVERTON,
OREGON s~o~~

PERFORMANCE REPORT
7D20 PROGRAMMABLE
DIGITIZER SERIAL#
VERSION LINE OF7D20
DISPLAY WHEN ID KEY IS PRESSED
TEK/7D20
COMPANY NAME :
" USER
:
ADDRESS :
CITY :

STATE :

ZIP :
PHONE :

EXTENSION
:
FORM SUBMITTEDBY :

DATE :
O
SYSTEM
DESCRIPTION : (Hardware, software, firmware
and host related to the problem)
MAINFRAME

MAINFRAME SERIAL # -
©
DESCRIPTION
OF
PROBLEM :
LIST ENCLOSURES :
ACTION TAKEN :
RESPONDER :

DATEOF RESPONSE :
SFPR LOG
INTERNAL
USE ONLY
(DO NOT WRITE BELOW
THIS LINE)
REASON FORREPORT :
Software/Firmware
Error
O Documentation Error
O Suggested Enhancement
IS THE
ERROR REPRODUCIBLE?
Yes ~ No
Intermittent
DATE RECEIVED
SFPR #

INSTRUCTIONS FOR COMPLETING
THE
SOFTWARE/FIRMWARE PERFORMANCE
REPORT
I .

Please type or print clearly . Use a
separate Software/Firmware Performance Report (SFPR)
for
each problem .
II .

SECTION Q
Fill in the serial number of the 7D20
PROGRAMMABLE DIGITIZER . Press the ID key on the
7D20 and copy the entire line of
Version information, beginning with TEK/7D20 .
III .

SECTION
O
Use your complete company
mailing address . Please include the name and phone number of the
person reporting the
error .
Also,
be sure to fill in the name of the person submitting the
SFPR .
IV . SECTION
Check the reason for report and whether
the error is reproducible . We cannot properly evlauate
the problem if we have difficulty in reproducing
the error .
V .

SECTION O
Give a complete description of the system
configuration on which the problem occurred . Please
include related peripherals, interfaces, options,
and operating system .
VI .

SECTION
0
Describe the problem completely . Include any
information which might help in evaluating the
error with the SFPR . If you have determined a procedure to
avoid the error condition, please
include this procedure . If this problem prevents you from
accomplishing any useful work with
the product, please state this fact . Be sure to include with the
SFPR any information (programs,
listings, hard copies, etc .) which will help us duplicate
your problem .
VI1 . SECTION
This section is for use by Tektronix Lab Scopes Software Maintenance
personnel .
DO
NOT
WRITE IN THIS SPACE .
VIII .

Mail all copies of the Software/Firmware Performance Report to :
TEKTRONIX, INC .
LAB SCOPES SOFTWARE MAINTENANCE
P.O
.
BOX 500 DEL . STA . 39-285
BEAVERTON,
OREGON
97077

TABLE
OF CONTENTS
7D20 Service
Page

Page
OPERATORS SAFETY SUMMARY ................... . , , ,,,
vii

SECTION 2 (CONT)
SERVICING SAFETY SUMMARY ........................,,,,
ix

DISPLAY CONTROL LOGIC ......... . . . . , ,... . . ..,
2-29
7D20FEATURES . . ................................. . ..,,,, ,x

DISPLAY LENGTH COUNTER ............. . . . .... . ,
2-30
X TEMPORARY
LATCH AND YLATCH ..... . , ,.....
2-30
X DATA MULTIPLEXER/LATCH ..... , . , . . .... . , ,,.
2-30
SECTION 1-GENERAL INFORMATION

BLANKING LOGIC ............... . , . ...... . . , , , ,,.
2-31
TECHNICAL MANUALS
.......................,,. . . 1-1

DISPLAY-ANALOG ................. . . . ,..... . . ..,,,.
2-32
Operators
Manual
.........,...........,,,,,,,,,
1-1

HORIZONTAL D-TO-A CONVERTER . .... . . , . . ....,,
2-32
Service Manual ..................,,,,,,,,,,,,,,
1-1

VERTICAL D-TO-A
CONVERTER ..... . . ...,......,. 2-32
INSTALLATION ............,.................... . . . . .
1-2

VECTOR FILTER ..... . . . . . . . . ....... . . ............
2-33
RACKMOUNT MAINFRAMES
................. . . . , . 1-2

DISPLAY OUTPUT AMPLIFIERS
. . . . . . . ............ 2-33
COMPATIBILITY ..................,.........., , , , ,
. 1-2

DISPLAY ANALOG BUS MULTIPLEXER .....,......
2-33
PACKAGING FOR SHIPMENT ............,. . . . . . . . ,
1-2

POWER SUPPLY ....... . , . . . . . . ......,,,,,,,.,,,,,,,
2-33
SPECIFICATIONS ............................. . . .... . . , , ,
1-3

POWER CONVERTER . . .....................,,,,, .
2-33
STANDARD ACCESSORIES ................,.. . . . . . , .
. 1-6

SELECT
LOGIC ... . . . . . .........,.........,,,,, , . ,
2-33
OPTIONALACCESSORIES (not included) .... . . . . . ..,. . .
1-6

POWER SUPPLY MONITOR .............,...... . , .
2-34
ATTENUATOR
RELAY DRIVERS ............. . . . . . .
2-34
M EM ORY .................................... .
. . . . . .

2-34
SECTION 2-THEORY OF OPERATION

DETAILED BLOCK DIAGRAM DESCRIPTION ..... . , , . , .
2-34
BLOCK DIAGRAM DESCRIPTION ......................,..
2-1

MEMORY READ/WRITE TIMING ...... . . . . . . . , . ...
2-34
OVERALL BLOCK DIAGRAM DESCRIPTION ............
2-1

DETAILED CIRCUIT DESCRIPTION ........... , . . . . . ,,.
2-36
CHARGE COUPLED DEVICE
(CCD) OPERATION ...... . . . 2-4

WAVEFORM MEMORY (WFM) ..... . . . , . . . . . ...,,.
2-36
TIME BASE MODES
............................... . . . 2-4

MEMORY TIMING
................. . . . . . . . ........ 2-37
DETAILED CIRCUIT OPERATION .......................,.
2-16

MEMORY
SYNCHRONIZATION ..... . . , . . . . , . ..,,,.
2-38
TEKTRONIX DRAFTING
CONVENTION .........,..,. . . 2-16

WAVEFORM MEMORY SELECT .... . . , , . . . . . ..,,,.
2-38
SWITCH BOARD ,............ ., ..... ., ....  .  ,.
. 2-16

MEMORY CONTROL ..... . . . ., ., . . . . . . . 
2-39
PUSHBUTTON SWITCHES
............. . . . , . , . , . . . 2-16

SELFTEST LATCHES
..... . . . . . . . . . . . . ....,....... 2-40
KNOB SWITCHES ........................ , , , . . . . . 2-16

DISPLAY ADDRESS GENERATOR . . ..,........,,,.
2-40
LED BOARD .................,..... . . . . . . , , , , , , .,,,,
2-16

~

ACQUIRE ADDRESS GENERATOR . . . . . ..........,.
2-41
LEDS ........................... . . , . . . . . . . . . .,,,.
2-16

DISPLAY/ACQUIRE ADDRESS
MULTIPLEXER ... . . . 2-41
GPIB INTERFACE ............. . . . . . . . . . . . . . ..,.,,.
2-17

BLOCK REGISTER . . . . . . . . . . , , . . ......,,,,,,,,,,,,
2-42
INTERCONNECT .............. . . . . . . . . . . . . . . . ....,,,.
2-17

DISPLAY OUTPUT LATCH . . . . . . . ,...,......,,,,,..
2-42
CH 1 AND CH 2 ATTENUATOR . . . . . . . . . . . . ...........
2-17

WAVEFORM
DATA LATCH .....,,,.........,,, ,,,,
2-42
SIGNAL INPUT AND DECADE ATTENUATOR .......
2-17

MICROPROCESSOR
ADDRESS MULTIPLEXER . . . . , 2-42
IMPEDANCECONVERTER AMPLIFIER .............
2-18

DATA MULTIPLEXER . . ..............,.,,,,, , , ,,,,
2-43
STEPATTENUATOR . . . . . . ., ., . . ., ...... 
2-19

MPU CONTROL . ........... ., . ., ...... 
, .2-43
VERTICAL PREAMP AND CONTROL ...............,..
2-19

MICROPROCESSOR .......,,,......., , , ,,,, , , ,,,,
2-43
VERTICAL PREAMPLIFIERS . . . . . . ............,.,..
2-19

MEMORY READY LOGIC ............. . . .... ....,.
2-43
ATTENUATOR AND PREAMPLIFIER CONTROL ...,.
2-20

DATA
BUS BUFFER ............ . . , . . ...... ,,,,,,.
2-44
PREAMPLIFIER ANALOG BUS MULTIPLEXER ......
2-20

ADDRESS LATCHES
........... . . ...... . . . .,...,. 2-46
VERTICAL DISPLAY
SIGNAL AMPLIFIER ........... 2-21

MEMORY AND
HARDWARE PORT ADDRESSING ...
2-46
CCD DRIVERS . . . ..........................,,.....,.
2-21

MPU BOARD MEMORY . . . . . . . . .,.. . . .....,,,,,,, ,
2-46
PREAMP OUTPUT AMPLIFIER ................... .
. 2-21

Monitor ROM . . . . . . . . ....... . . ,.......,,,,,,, ,
2-46
CCD CLOCK ...............................
. . . ... 2-21

Static RAM ..... . . . . . . . . ......
. . . . . . .......... 2-46
Input Sampling Clock ............... . . . .
. ...... 2-22

EPROM . . . . . . . ....... . . . . . . . . .................
. . 2-46
Transport and
Output Sampling Clocks . ... . . . . . 2-22

EPROM . .......... . . . . . . . . ,...........,,,,,, , , , , 2-47
CHARGE COUPLED DEVICES (CCD) ....... . . ,.....
2-23

MPU BOARD HARDWARE PORTS
....,........ . . . . 2-47
CCD OUTPUT ............,...,.........   .   
2-25

Data Latches . . . . . ..,.........,.........  .
, 2-48
CCD AMPLIFIERS AND MULTIPLEXER . .... . . . . . ...
2-25

Shift Registers .....................,... . . . . , , .
2-48
ANALOG-TO-DIGITAL CONVERTER . .... . . . . , ......
2-25

System Clock and Off-Board Select
Decoder . ... 2-48
CCD TEST SIGNALMULTIPLEXER . . . . . . . . ..,......
2-25

POSITION CONTROL ................ . . . , , , ,,,,,,, 2-4g
DISPLAY .................... . . . . . . . . . . . . . . , ,,,,,,,, 2-26

SELF
TEST
AND
ANALOG DATA PROCESSING . .... 2-48
DETAILED BLOCK DIAGRAM DESCRIPTION . . ......
2-26

Data
Bus Multiplexer .......... , , . . , . . . . ..,,,,, 2-49
TYPICAL DISPLAY CYCLE . . . . . . . .......... ., ......
2-26

TRIGGER ............... ., .......  . 
2-49
DISPLAY MODES ... . . . . . . . . . . . ....:.....,.......
2-28

DETAILED BLOCK DIAGRAM
DESCRIPTION . . . . ....... 2-49
DISPLAY-DIGITAL ... . . . . . . . . .......................,
2-28

TRIGGERING MODES
......... . . . . . . . . , .......,,. 2-49
MODE CONTROL DATALATCHES .................
2-28

DETAILED CIRCUIT DESCRIPTION
. . . . . . . . ............ 2-51
DISPLAY CLOCK . . . . . . . . . . . , .,...........,,,,,,..
2-29

TRIGGER DATA LATCHES
. ..
. . .........,.......,.
2-51

7D20 Service
TABLE OF CONTENTS (CONT)
Page

Page
SECTION 2 (CONT)

SECTION 3 (CONT)
TRIGGER
GENERATOR ....................... . . . . 2-51

STATIC-SENSITIVE DEVICE CLASSIFICATION .... . . .
3-4
TRIGGER
LEVEL . . ............................... 2-53

MULTI-PIN CONNECTOR
IDENTIFICATION ..........
3-7
EXTERNAL TRIGGER ......................... . . . . 2-53

TROUBLESHOOTING EQUIPMENT ..................
3-7
COUPLING AND SOURCE LOGIC ................ . . 2-54

TROUBLESHOOTING TECHNIQUES .................... 3-8
PEAK-TO-PEAK DETECTOR ....................... 2-55

1 .
CHECK CONTROL SETTINGS ....................
3-8
ANALOG BUS MULTIPLEXER ................. . . . . 2-55

2 . CHECK ASSOCIATED EQUIPMENT ............... 3-8
SWEEP GATE . . . . . ............................... 2-55

3 . VISUAL CHECK . . . . . . . . . ........................ 3-8
SINGLE SWEEP .............................. . . . . 2-55

4 . ISOLATE TROUBLE TOA CIRCUIT ............... 3-8
HORIZONTAL DISPLAY OUTPUT AMPLIFIER ....... 2-55

5 . CHECK INSTRUMENT ADJUSTMENT ............. 3-8
BLANKING OUTPUT AMPLIFIER .................. . 2-55

6 . CHECK VOLTAGES . . ........................... 3-8
TIME BASE . ....................................... . 2-55

7 . CHECK INDIVIDUAL COMPONENTS .............. 3-8
DETAILED BLOCK DIAGRAM
DESCRIPTION ...........
2-56

Fuses . . . . . . . . . . . . . . . . . ........................ 3-9
CLOCK GENERATOR
............................... .
2-58

Transistors . . . . . . . . . . . ..... . . . . . ............... 3-9
CLOCK GENERATOR
.............................
2-58

Integrated Circuits . . . . . . . . ..................... 3-9
PHASE
CLOCK GENERATOR ...................... 2-58

Diodes ....... . . . . . . . . . . . . . . . . . . . . . ............ 3-9
SAMPLE
COUNTER
.......

................
2-59

Resistors . . . . . . . . . . . . . . . . . ..................... 3-9
STARTCONVERSION,
CH 1 /CH , 2 AND

Capacitors
. . . . . . . . . . . . . . . . . . . .................. 3-9
MAGNIFIER CLOCK
GENERATORS ................ 2-60

8 .
REPAIR AND ADJUST THE CIRCUIT .............. 3-9
EXTERNAL CLOCK ............................... 2-60

CORRECTIVE MAINTENANCE . . . . . . . . ................... 3-10
ACQUIRE
WAVEFORM
CLOCK
GENERATOR ....... 2-60

OBTAINING REPLACEMENT PARTS . . . . . . . ........... 3-10
VALID
SAMPLE CLOCK GATE ..................... 2-60

SPECIAL PARTS .......... . . . . . . . . . . . . ........... 3-10
ACQUIRE CONTROL . . . . . . . . . . . . . . . . . ................ 2-61

ORDERING PARTS . . . . . . . . . . . . . . ................. 3-10
SERIAL DATA LATCHES .......................... 2-61

SOLDERINGTECHNIQUES . . . . . . . . . . . ................ 3-10
POST-TRIGGER COUNTER ........................ 2-61

COMPONENT REMOVAL AND REPLACEMENT ........ 3-11
END ACQUIRE . .... . . . . . . . . . . . . . . . . . ............. 2-62

SEMICONDUCTORS . . . . . . . . . . . . . . . . .............. 3-11
FAST-IN, SLOW-OUT LOGIC . . . . . . . . . ............. 2-62

CIRCUIT BOARDS . . . . . . . . . . . . . . . . . . .............. 3-1 1
ACQUIRE WAVEFORM CLOCK
ENABLE ...........
2-62

Tools Required . . . . . . . . . . . . . . . . . . .............. 3-11
FAST RAMP TIME INTERPOLATION . . . . . ............. 2-65

Board Guides ............. . . . . . . . . . . . . ........ 3-13
TRIGGER GATE INPUT
. . . . . . ......................
2-65

Back Panel .................. . . . . . . . . . ........ 3-13
FAST
RAMP SELF TEST . . . . ...................... 2-65

Front Panel . ........ . . . . . . . . . . . . . . . . .......... 3-13
FAST RAMP
GENERATOR . . ..... . ................
2-65

Front-Panel Disassembly . . . . . . . . . . . . . . ........ 3-14
FAST RAMP COUNTER . . . . . . . . . . . . . . . . . . . . ....... 2-66

Separating
The Front-Panel Boards . . . . . ........
3-15
DETAILEDDESCRIPTION OF TIME BASE MODES ..... 2-68

Switch
Replacement ... . . . . . . . . . . . . . . . ........
3-15
Roll Mode . . . . . . . . . . . . . . . . . . . . . . . ............. 2-68

A11 Timebase Board . ..... . . . . . . . . . . . . ........
3-15
REAL-TIME DIGITIZING MODE . . . . ..... . .......... 2-68

A9
MPU Board .................. . . . . . . . . . .....
3-15
EXTENDED REAL-TIME DIGITIZING . . . ............. 2-69

A8Memory
Board ......... . . . . . . . . . . . . ........ 3-15
EQUIVALENT TIME DIGITIZING . . . . . . ..... . . . ...... 2-69

A6 Display
Board ............ . . . . . . . . . . ....... 3-16
A5CCD
Board ............ . . . . . . . . . . . . . ....... 3-16
A10 Trigger Board .............. . . . . . . . . . ..... 3-16
SECTION 3-MAINTENANCE

A7 Power Supply Board ............... . . . . . . . . 3-16
PREVENTIVE MAINTENANCE ..... . . . . . . . . . . . . . . . . . . ..... 3-1

A3 Interconnect Board Removal . . . . . . . . . . . ..... 3-16
PLUG-IN PANEL REMOVAL ....... . . . . . . . . . . . . . . . ..... 3-1

A4 Preamp Board ............... . . . . . . . . . ..... 3-16
CLEANING .......................... . . . . . . . . . . . . ..... 3-1

Attenuator Covers and Relays ....... . . . . . . . . . . . 3-17
EXTERIOR ............................. . . . . . . . . . . . 3-1

Attenuator ..............................
. . . . ..
3-18
INTERIOR ........................... . . . . . . . . . . .... 3-1

Plug-in Latch ...................... . . . . . . ..... 3-18
LUBRICATION ......................... . . . . . . . . . . . . . . 3-3

INTERCONNECTING PINS ................ ..... .... 3-18
PANCAKE
SWITCH LUBRICATION ....... . . . . . . . . . . .
3-3

Coaxial-Type End-Lead Connectors .... . . . . . . . . . 3-18
VISUAL INSPECTION ............................ . . . . . 3-3

Circuit-Board Pins ........................ . . . . . 3-18
SEMICONDUCTOR CHECKS .................. . . .... . . 3-3

Circuit-Board
Pin Sockets .............. . . . . . . . .
3-19
ELECTRICAL ADJUSTMENT ......................... . . 3-3

Multi-Pin Connectors .................. . . . . . . . . 3-19
ADJUSTMENT AFTER REPAIR ................ . . . . . . . . 3-3

ADJUSTMENT AFTER REPAIR ............ . . . . . . . . 3-19
TROUBLESHOOTING .................................. . . 3-4

TESTING AND DIAGNOSTICS ........................ . . . 3-20
TROUBLESHOOTING AIDS ....................... . . . . . 3-4

INTRODUCTION ................................ . . . . . 3-20
DIAGRAMS ....................................... 3-4

TESTING FACILITIES . . . ........................... . . 3-20
CIRCUIT BOARD ILLUSTRATIONS ............. . . . . . 3-4

SELF-TEST . . . . . . . . . . . . .......................... 3-20
SIGNATURE ANALYSIS TROUBLESHOOTING ....... 3-4

How to Start a Self-Test ....................... 3-21
COMPONENT COLOR CODING ................... . . 3-4

Repetitive Self-Testing ....................... . . 3-21
SEMICONDUCTOR LEADCONFIGURATIONS ........ 3-4

EXTENDED TESTS .... . ........................ . . 3-21

Page

Page
SECTION 3 (CONT)

SECTION 5-INSTRUMENT
OPTIONS
EAROM
Test . . . . . . . . . . . . . . . . . . . ...............
3-21
GPIB Test . . . .............,,...,,,,,,,.,,,,,,,
3-23

SECTION 6-REPLACEABLE ELECTRICAL
PARTS
Front-Panel
Test ........  . . ., .  , 3-24
TROUBLESHOOTING
MODULES ..............,.,.,,.
3-24

SECTION 7-DIAGRAMS AND
CIRCUIT BOARD
CIRCUIT EXERCISE
.............,,....,,,,, , , , , , , ,
3-24

ILLUSTRATIONS
Description of Circuit
Exercises and

DIAGRAM
Self-Tests ...........................
. . . . . . . . .
3-25

SWITCH BOARD ................... . . .
. . . . . ..... . . ..... 1
BACKGROUND
INFORMATION ON SIGNATURE

LED BOARD ....................,.. , . . , . ,,,,, , , , ,,,,,,,
2
ANALYSIS . . . . . . . . . . . ..
. . . . . . . . . . . . . . . . . .........
3-42

INTERCONNECT ................. . . .
. . . . . . . . . ........... 3
WHAT TO DO IF 7D20
DOES NOT RESPOND TO

CH1 AND CH2 ATTENUATOR .... . . . , , ...., . . ,.,,,,,,,,,
4
FRONT-PANEL CONTROLS . .........,,..,,,,,,,,,
3-43

VERTICAL PREAMP AND CONTROL . . . . . . . . . . ....,..,..,
5
HIERARCHY OF TEST MENUS .............  , .,
. . .3-45

CCDDRIVERS ...... . . . . . . . . ........ . . .  .  . 
.6
GLOSSARY OF TERMS ..............................
3-47

CCD
OUTPUT
.
. ..... . . . . . . . . ..... . . . . . ................. 7
DISPLAY-DIGITAL
... . . . . . ..... . . . . . ....................
8
DISPLAY-ANALOG
. . . . . . . . . . . . . . ...,................... 9
SECTION
4-CHECKS AND ADJUSTMENT

POWER SUPPLY BOARD . . . . . .......,,..,...,.,,,,,,,,
10
USING THESE PROCEDURES . ., ......  , . . . .  ,
4-1

MEMORY BOARD ., . . . . .....  ., ... ., . 
11
PERFORMANCE CHECK AND ADJUSTMENT

MPU CONTROL . . . . . ..............,.,,......,,,,,, , , ,,
12
SUMMARY
........ . . . . . . . . .......... . . .
. . . . . ..... 4-1

TRIGGER .... . ....................................
. . . . 13
TEST
EQUIPMENT . ... ., . ., . . 
4-1

CLOCK GENERATOR ........  . . ., . ., . 
14
TEST EQUIPMENT
ALTERNATIV ES

........,.,...,,,

4-2

ACQUIRE CONTROL . .............,,...,...., , , , , , ,,,,,

15
PARTI-FUNCTIONAL
CHECK PROCEDURE . . . . ....,..,.,.
4-7

FAST RAMP TIME INTERPOLATOR ........,,... ,..,,,, ,
16
7D20 FUNCTIONAL
CHECK . . . . . . . , . . .,.,,,,,,,,,,,,,,
4_7

FUNCTIONALINTERCONNECT DIAGRAM ..... . . .... . . , .
17
1 . SELF TEST . . . . . .......  ., . ., .  ,
4-7

SIGNATURE
ANALYSIS TABLES
2 . EXTENDED SELF
TEST ......  . .  4-7
3 . CHECK
7D20 INPUT CONNECTORS ........... ., .
4-7

SECTION 8-REPLACEABLE
MECHANICAL PARTS
4 . CHECK
GPIB OUTPUT DRIVERS ......... . . . . . . . .
4-8
PART
II-PERFORMANCE CHECK PROCEDURE . . . . . . . . . . 
4-9

CHANGE INFORMATION
INDEX
TOPART II-PERFORMANCE CHECK
PROCEDURE ............
. . . . . . . . . . . . . . . . . . . . . ........
4-9
PERFORMANCE CHECK INITIAL
SETUP PROCEDURE ... 4-9
A . SIGNAL ACQUISITION AND DISPLAY . . . . . , , ....,,,
4-10
PART
III-ADJUSTMENT PROCEDURE . .........,,,..,,,.
4-18
INDEX
TOPART III-ADJUSTMENT PROCEDURE ......
4-18
ADJUSTMENT INITIAL SETUP PROCEDURE .....,,.,,.
4-18
A . SIGNAL
ACQUISITION AND DISPLAY .....,,,...,,.
4-19
B . TRIGGER ....................................
. . . . 4-37
C . TIMING AND
STEP RESPONSE ............. , . . , , , .
4-45
RELATED DOCUMENTATION
The tabbed "ACCESSOR
IES" page at the rear of this manual lists the Tektronix
part numbers for all
Standard Accessories
providedwith this product
.
Also, Section 1, General
Information, contains a brief
basic-content description for the
following publications .
MANUALS (Standard
Accessories)
7D20 Operators
7D20 Service
REV OCT 82
TABLE
OF CONTENTS (CONT)
7D20 Service

7D20 Service
Figure

Figure
No .

Page No .

Page
1-1

7D20 Release Latch ............................ 1-2

2-33

Simplified schematic
of fast
ramp
generator ... . 2-67
1-2

Dimensional Drawing . ......................... 1-7

3-1

Color code for resistors and capacitors
......... . . 3-5
2-1

7D20 Overall block diagram .................... 2-2

3-2

Semiconductor lead configuration ....... . . . ... . .
3-6
2-2

Simplified block diagram of Charge Coupled

3-3

Orientation of multi-pin connectors ......... . . ... 3-7
Device (CCD) . . . ............................... 2-4

3-4

Recommended desoldering sequence ....... . . . . 3-1 1
2-3

Non-Fast
In,
Slow-Out TimeBase Modes :

3-5

Board guide and Interconnect Board Removal ... 3-12
(A) Roll Mode ; (B) Real-Time Digitizing

3-6

Back-panel removal ....................... . . . . 3-13
(RD) Mode . . . . . . ............................... 2-6

3-7

Latch assembly .......................... . . . . . 3-14
2-4

Fast-In, Slow-Out Time Base Modes :

~

3-8

Preamplifier Board removal ....... . . . . . . ... . . . .
3-17
(A) Extended Real-Time Digitizing (ERD) Mode ;

3-9

Coaxial-end lead connector assembly .... . . . . . . . 3-18
(B) Equivalent Time Digitizing (ETD) Mode ....... . 2-7

3-10

Exploded view of circuit-board pin and
2-5

Simplified schematic diagram of Atenuator

ferrule ................................ . . .... .
3-19
board's relay controls ...................... . . . 2-18

3-11

Waveform for Ch 1/Ch 2 Position test ... . . .... . 3-26
2-6

Effect of VOLTS/DIV VARIABLE control
on

3-12

Waveform for WMS Generator
test . . . ..... ..... 3-28
preamplifier circuit gain .......................
2-20

3-13

Waveforms
for
Horizontal Counter test . . . . . . . . . 3-30
2-7

Generation of non-ERD and ERDCCD modes ... 2-22

3-14

Waveform for Horizontal DAC
test . . . ...... ..... 3-30
2-8

Generation of input sampling clock .......... . . . 2-23

3-15

Waveform for Horizontal
Vector filter test ..... . . 3-31
2-9

Generation of Output Sampling Clock and

3-16

Waveform for Horizontal Output test . . . .... . . . . 3-31
Transport Clock : (A) Fast-In Phase ;

3-17

Waveform produced by Waveform Data Bus
(B) Slow-Out Phase ........................ . . . 2-24

test .......................... . ..... . . .... . . . . 3-33
2-10

Detailed block diagram of display circuitry . .... . 2-27

3-18

Waveform for
Vertical
DAC
test . . . . . .... ....... 3-33
2-1 1

Display timing : (A) Basic Clock Signals ;

3-19

Waveform for Vertical Expand test . . . . . .... . . . .
3-33
(B) YCK and XCK Signals ................... . . . 2-29

3-20

Waveform for Vertical Vector Filter test .... ..... 3-33
2-12

X-Dataand Y-Data latch timing ............... . 2-30

3-21

Waveform for Vertical Output test . . . .... . . .....
3-34
2-13

Crt Beam
Blanking Timing : (A)
Vector
Mode ;

3-22

Waveform for Z-Axis test ... . . . . . . . . .... . . ..... 3-34
IBI
Dots Mode ............................. . . . 2-31

3-23

Waveforms for INS, SO, and EOA tests . ........ 3-36
2-14

Detailed block diagram of Memory circuitry .... . 2-35

3-24

Waveform for Trigger Level DAC test ........... 3-37
2-15

Memory
timing signals
.................. . . . . . . 2-36

3-25

Waveforms for Trigger Generator test .......... 3-37
2-16

Waveform memory
RAM
access timing ...... .
. .
2-37

3-26

Waveform for Ch 1 /Ch 2 Position test . . . ....... 3-39
2-17

GENSELA and GSA signal synchronization . . . . . .
2-38

3-27

Waveform for Ch 1/Ch 2 Step Attenuator test . . 3-40
2-18

WMEMSEL timing and synchronization . ..... . . .
2-39

3-28

Waveform for Ch 1 /Ch 2
Decade Attenuator
2-19

Microprocessor(U910)read/write timing . ... . . .
2-44

test .............. . . . . . . . . ....
. . . . . ...........
3-40
2-20

Timing of microprocessor memory read logic :

3-29

Waveform for Ch 1/Ch 2 5 mV/Div
test ........ 3-40
(A) MWFM active ; (B) INEX active for a read . . . . .
2-45

3-30

Waveform for Ch 2 Invert test .... . . . ...........
3-41
2-21

MPU board memory map .......... . . . . . .... . . . 2-46

3-31

Waveform for CCD Multiplexer
test ............ . 3-42
2-2 .2

Microprocessor memory space select
timing . . . .
2-47

3-32

Waveform for CCD A/D Converter
test ......... 3-42
2-23

Block diagram of
trigger circuitry ...... . . . . . . . . . 2-50

3-33

Configuration of jumper
connectors on MPU
2-24

Peak-to-peak detector in p-p
triggering
mode .... 2-51

Board for Forced
Instruction Freerun ........... 3-44
2-25

Simplified schematic of
trigger generation

4-1

Display adjust pattern . . . . . . . . .................
4-10
U900 ..................................... ...
2-52

4-2

CURSORS 1 and 2 used to measure
p-p
2-26

Simplified schematic
of external trigger

voltage . . . . . . . . . . ....... . . . . . ................. 4-11
circuit ..................................... . . . 2-54

4-3

Check Vertical Linearity .......................
4-13
2-27

Detailed block diagram of time base circuitry ... . 2-57

4-4

CH 1 vs CH 2 ... . .... . . . . . .................... 4-14
2-28

Clock
generator output signals .............. . . . 2-59

4-5

Measuring Timing to 0 .1% . .................... 4-17
2-29

Start Conversion (SC), Ch 1/Ch 2 and Magnifier

4-6

Display Adjust Pattern . . ....................... 4-19
Clock (MAGCK) signal timing .................. 2-60

4-7

Display Offset adjustment . .................. . . 4-20
2-30

Acquire Waveform Clock (AWCK) generator ..... 2-61

4-g

Typical CURSORS

Display . ................... 4-26
2-31

Post-trigger counter timing .................... 2-62

4-9

Display Adjust Pattern ....................... . . 4-37
2-32

Acquire Waveform Clock Enable (AWOKE) timing :

4-10

Display Adjust Pattern . . ..................... . .
4-45
(A) Top active on falling edge of POKE ; (B) Top

4-11

Gain Count readout . . . . . . . ....................
4-46
low on falling edge of
PCK ..................... 2-64

4-12

Fast Ramp Offset adjustment . ................. 4-46
LIST
OF
ILLUSTRATIONS

LIST
OF
TABLES
Table
No .

Page
1-1

Electrical
Characteristics ........ . . . . . . .... .  1-3
1-2

Environmental
Characteristics ... . . . . . . . . , , . . .,, 1-6
1-3

Physical Characteristics
. . . . . . . . . . . . . ....,.,,.., 1-6
2-1

Summary of Time Base Modes . . . . . . . . . . . , ,,,..,
2-5
2-2

Sample Acquisition in the ETD
Mode . . .
.....,,, ,
2-8
2-3

Signal Name Dictionary . . . . . ..... . . ...,,,.,..,, 2-g
2-4

Signal Input and Attenuator Relay
Control ....,, 2-17
2-5

Step Attenuator Control . . . . . . . . , ,,,,..,,,,,,,,
2-19
2-6

Preamplifier Analog
Bus Multiplexer
0230 Control . . . . ............ ., .......... . . . . .
2-21
2-7

CCD Test Signal Multiplexing ....,,,,....,,,,,,
2-25
2-8

LATCK Timing . . . . . . ...........  , ., ...  ,
2-40
2-9

Block Register Address Assignments ...... . . . . .
2-42
2-10

U910 Interrupt Priority ............. . , , , , ..,.,,
2-43
2-1 1

Timing of TimeBase Modes ........... . , .,...,
2-56
2-12

Sample Counter Presets .........,.,,,, . . ,.,,,.
2-63
3-1

Part Number Reference For Support
Items
.
.....
.
3-2
3-2

Relative Susceptibility to Damage from
Static Discharge .............. ., ., . . .  
3-7
3-3

Lighted MEMORY DISPLAY Buttons vs Test
Indicated
................. . . . . . . . . .... . . ......
3-21
3-4

Self-Tests .......... . ..
. . . . . ....... . . . ........ 3-22
3-5

Stimulus and Checks for Horizontal
Tests ....... 3-31
3-6

Stimulus and Checks for Vertical
Tests ......... 3-32
3-7

Stimulus and Outputs for Z-Axis Tests ..........
3-34
4-1

Performance Check and Adjustment
Summary , ., 4-2
4-2

Test Equipment . . . . ..........  ,..  . .  ,
4-5
4-3

Vertical Deflection Accuracy . ..............,,,.
4-11
4-4

Low Frequency Triggering
Checks ........... . . . 4-16
4-5

High Frequency Triggering Checks .......... . . ,
4-16
4-6

Timing Accuracy . ................ ., ., ., . .  : 
4-17
4-7

CH 1 High Frequency Adjustments ...... .......
4-48
4-8

CH 2
High
Frequency Adjustments .... . . . . . . . . ,
4-49

OPERATORS SAFETY SUMMARY
The general safety information
in
this
part of the summary
is
for
both
operating and servicing personnel . Specific
warnings and cautions
will
be
found throughout the manual where
they
apply, but may not appear in this summary .
IN THIS MANUAL
CAUTION statements identify conditions or practices that could result in damage to the equipment or
other property .
WARNING statements identify conditions or practices that could result in personal injury or loss of
life .
AS MARKED ON
EQUIPMENT
CAUTION indicates a personal injury hazard not immediately accessible as one reads the marking, or a hazard to
property including the equipment itself .
DANGER indicates a personal injury hazard immediately accessible as one reads the marking .
SYM BOLS
IN THIS
MANUAL
© Static-Sensitive Devices
Q This symbol indicates where applicable cautionary or other information is to be
found .
AS
MARKING ON EQUIPMENT
DANGER-High voltage .
Protective ground (earth) terminal .
Q ATTENTION-refer to manual .
POWER SOURCE
This product is
intended
to
operate in a mainframe connected to a power source that will not apply more than 250 volts
rms between the supply conductors or
between
either supply
conductor and ground . A protective ground connection by
way of the grounding conductor
in the power cord
is essential
for
safe
operation .
GROUNDING THE PRODUCT
DANGER
ARISING FROM LOSS OF GROUND
TERMS
WARNINGS
7D20 Service
This product is
grounded through the grounding conductor of the mainframe power cord . To avoid electric shock, plug
the
mainframe power cord into a properly wired receptacle before connecting to the product input or output
terminals . A
protective-ground connection by way of the grounding conductor in the mainframe power
cord
is
essential for safe
operation .
Upon loss of
the protective-ground connection, all accessible conductive parts (including knobs and controls
that may
appear to
be insulating), can render an electric shock .

7D20 Service
DO NOTOPERATE IN
EXPLOSIVE ATMOSPHERES
To avoid
explosion, do not operate this product in an atmosphere of explosive gasses .
DO
NOT REMOVE COVERS OR PANELS
To avoid
personal injury, do not remove the product covers or panels . Do not operate the
product without the covers and
panels
properly installed .
DO NOT OPERATE
WITHOUT COVERS
To
avoid personal injury, do not operate this product without covers or panels
installed . Do not apply power to the plug-in
via a plug-in extender .

SERVICING SAFETY SUMMARY
DO
NOT SERVICE ALONE
FOR QUALIFIED
SERVICE PERSONNEL ONLY
Refer also to the preceding Operators Safety Summary
USE CARE WHEN
SERVICING WITH
POWER ON
Disconnect power before removing protective panels, soldering, or replacing components .
7D20 Service
Do not perform internal service or adjustment of this product unless another person capable of rendering first aid and
resuscitation is
present .
Dangerous voltages exist at several points in this product . To avoid
personal
injury,
do not touch exposed
connections
and components while power is on .

7D20
Service
7D20FEATURES
The 7D20
Programmable Digitizer
is designed to enhance the capabilities
of 7000-series oscilloscope
mainframes . Multiple waveform
storage,
crt readout, two cursors
for point-to-point measurements, pre- and
post-trigger viewing, store and
recall of up to six front-panel
settings,
and signal averaging to
reduce noise are just a few of the
features this three-wide plug-in
unit provides .
Waveform
storage using digital
memory eliminates the need for a storage
crt, and allows viewing information that
occurred prior to
a
triggering
event . Six waveforms
can be stored and displayed at the same
time for easy comparison
.
A
complete alphanumerical
display of cursor waveform
information and measurement values, time base
and amplitude settings,
trigger
position,
displayed waveform
number, prompts and error messages,
and a master menu that allows you
to chooseseldom used
features
easily and quickly .
The master menu offers aconvenient
way to enable special
functions such as the STORE and RECALL
of front-panel settings
as well as
allowing you to branch-out
to other menus . The test menu
is designed to assist in troubleshooting
the 7D20 in the event of a
failure .
The SELF TEST may be
implemented at any time to ensure
user confidence . The other selections
allow service personnel
to diagnose
faults to the component
level .
Complete control of
the 7D20"s functions may be controlled
via the IEEE-488 interface .
Commands, waveforms, and
alphanumeric text
messages may be sent
or received via the
front-panel port .

GENERAL INFORMATION
This section is the first place to look for information concerning your
7D20 Programmable Digitizer . Here we describe
the
basic
content of the operators and service manuals
which
are
standard accessories to your new instrument .
We also
include a brief general description of the
7D20 and explain how to install it in a host mainframe for
operation . In this
section we give the electrical,
environmental, and physical characteristics and specifications of
the 7D20, list the
standard and recommended accessories,
and provide a dimensional drawing of the instrument . Should
you have need to
repackage the instrument
for shipment, that information is also included .
TECHNICAL
MANUALS

SECTION 6-INSTRUMENT
OPTIONS contains
Both an operators and a service manual are supplied

descriptions of available
options .
with your 7D20 as standard accessories .
The following

Service Manual
information outlines the content
of these manuals .
Section
1-7D20
Your service manual
contains eight sections of
Operators Manual

information pertaining to
the servicing needs of your
The operators
manual for the 7D20 contains six sections

7D20 . The following is
a brief overview of this manual's
of information
to explain the operation of your

contents .
instrument .
The content of the operators manual is

WARNING
described below :
SECTION 1-GENERAL INFORMATION contains
an
instrument description along with information
for

The following
service instructions are for use
installing the 7D20 into a host
mainframe . We make a

bY
qualified
personnel only . To avoid personal
special

note regarding
rackmounting and another

in%ury,
do not perform any service other than
that
contained in operating instructions
about compatibility
considerations . This section also

unless you are
qualified to do so . Refer to
provides a complete list of
the 7D20 electrical,

Operators
Safety Summary and Service
environmental, and physical
specifications and

Safety
Summary prior to performing any
characteristics . It also lists standard and

service .
recommended accessories, and
gives instructions for
packaging the instrument
for shipment .

SECTION 1-GENERAL
INFORMATION contains an
instrument description along with information
for
SECTION
2-OPERATING INSTRUCTIONS provides a

installing the 7D20 into a host
mainframe . We make a
general
overview of the instruments capabilities,

special note regarding
rackmounting and another
controls and
connector information, a series of get

about compatibility
considerations . This section also
acquainted
exercises, and detailed operating

provides a
complete list of the 7D20 electrical,
information .

environmental, and physical specifications and
characteristics . It also lists standard and
SECTION
3-OPERATIONAL THEORY provides

recommended accessories, and gives instructions for
additional
information about the operation of the 7D20

packaging the instrument for shipment .
digitizer . This section discusses the
more technical
aspects of the digitizing techniques used
by the 7D20

SECTION 2-THEORY OF
OPERATION provides a
and gives the algorithms used
for waveform averaging

basic block diagram description of
the 7D20 along
and enveloping .

with general and specific
circuit analysis that may be
useful for
servicing the instrument .
SECTION 4-GPIB contains a general
description
of
the GPIB interface, address selection
information,

SECTION
3-MAINTENANCE describes routine and
description of the instrument
status following power-

corrective

maintenance

procedures
with

detailed
up, and descriptions
of the commands and messages

instructions
for replacing assemblies, subassemblies,
which
can be transferred over the GPIB . The section

and
individual parts . Included in this section are full
also
provides a command language index
.

instructions
for troubleshooting the 7D20 using
internal diagnostic routines
and signature analysis .
SECTION
5-APPLICATIONS illustrates how your
7D20 can
be used in a variety of situations . In this

SECTION
4-CHECKS AND ADJUSTMENTS is divided
section
we combine the 7D20 with other Tektronix

into three separate
parts
:
Part I-Functional Check
products for some
unique and interesting digital

Procedure used
to verify that the major functions of
storage
application possibilities .

the instrument
perform properly . Part II-Performance

General Information-7020
Check Procedure used to
verify
that this
instrument
meets the applicable
electrical specifications in
Section
1 . Part III-Adjustment Procedure provides an
adjustment procedure to ensure that this instrument
is performing at peak capabilities and meets or
exceeds the listed electrical specifications at the time
of adjustment under the specified conditions . These
three parts provide for verification of the qualitative
integrity of the product, its performance relating to
specifications in Section
1, and the optimization
of
its
performance
respectively .
SECTION
5-INSTRUMENT OPTIONS contains
descriptions of
available
options
and provides a table
for locating
any option information found elsewhere
within the manual .
SECTION 6-REPLACEABLE ELECTRICAL PARTS
provides the information necessary to order
replaceable parts
and assemblies .
SECTION 7-DIAGRAMSAND CIRCUIT BOARD
ILLUSTRATIONS includes detailed circuit schematics,
locations of
assembled boards within the instrument,
voltage
and waveform information and circuit board
component locators . Signature analysis
troubleshooting charts and tables also are included
within this section .
SECTION 8-REPLACEABLE
MECHANICAL PARTS
provides information
necessary for ordering
mechanical parts
and includes exploded-view
drawings which identify
individual parts and
assemblies within the
7020
.
.M L

POSITION
COM PATI BILITY
PROGRAMMABLE
Taxv°"ix
DIGITIZER
7p20
RACKMOUNT MAINFRAMES
AOD -1
AC GND DC
1MSE 20DF
Vpk 5 250V
RELEASE
LATCH
Figure 1-1 . 7020 Release Latch .
ocT c
10 kFk
TTL Vpl
3858-195
To remove the 7020
from its host mainframe, pull the
release latch (see Fig . 1-1) to
disengage it from the
mainframe . Pull straight out to
remove the 7020 from the
plug-in compartment .
A special option (Option 20) is available
for TEKTRONIX
R7603 Oscilloscope (rackmount) mainframes that enable
you
to make GPIB connections at the rear of the
mainframe . The option includes a special
cable which
must be installed in the 7020 for this purpose .
This
cable
is
also available separately and can be ordered as an
optional accessory .
INSTALLATION

The 7020 is
compatible with all Tektronix 7000-series
mainframes except the
7104 . Because of the small area
The 7020 is a
three-compartment wide, Tektronix 7000-

and fixed pattern of
the 7020 readout, the display from
series plug-in unit . To
install the 7020 in a host

the 7020 can
cause permanent reduction in the crt
mainframe,
align the grooves in the top and bottom of the

microchannel

plate

gain,

permanently

reducing the
instrument with the guides at the top and bottom of the

~n,riting rate of the 7104 . Any crt damage caused
by
use
plug-in
compartment of the mainframe . Then, push
the

of the 7020 in the 7104 will not be
covered
under the
7020
in until its front panel is flush with the
front panel

instrument warranty .
of the host mainframe . In four-compartmentmainframes,

i
the
preferred position for installation is in the three
right
hand compartments . This leaves the
left vertical

PACKAGING
FOR SHIPMENT
compartment available for other 7000-series
plug-in

If this
instrument is to be shipped for long distances by
units .

~

commercial
transportation, we recommend that it be
packaged
in the original manner . The carton and
Installation in any mainframe requires that
the 7020

packaging
material in which your instrument
was
display output be adjusted to
compensate for the

shi

purpose .
calibration tolerances of
the
host
mainframe . The

Peed
should be saved and used
for this
procedure for doing this is
given in the section 2 of the

Also, if this instrument is to be
shipped to a Tektronix
Operators Manual .

Service Center for service or
repair, attach a tag to the
instrument showing the following
: Owner of the
NOTE

instrument (with address),
the name of the person at
Switch off the
mainframe power before

your firm who can be
contacted, complete instrument
removing or
installing the 7020 .

type and serial
number, and a description of the service
REV OCT 82

required
. Include any self test failure
information you

3 . Cushion the instrument on
all sides by tightly
have
available .

packing dunnage or
urethane foam between the
carton and
the instrument, allowing three inches on
If the original packaging
is unfit for use or not available,

each side
.
package the instrument
as follows :
4 . Seal the carton with shipping tape or
with an
1 . Obtain a
corrugated cardboard shipping carton with

industrial stapler .
a 200-pound test
strength and having inside
dimensions at least
six inches greater than the

5 .
Mark the address of the Tektronix
Service Center and
instrument
dimensions . This allows for cushioning
.

your return address on
the carton in one or more
prominent locations
.
2
. Wrap the instrument with
polyethylene sheeting or
equivalent material to protect
the finish of the
instrument .
The electrical
characteristics listed in Table 1-1 apply when the
following conditions are met : (1)
Adjustment of the
instrument must have taken
place at an ambient temperature between
+20° and +30° C, (2) the instrument
and its host
mainframe must be allowed
a 20-minute warm-up period, (3) all
specifications are valid at an ambient
temperature of 0°
to
+45° C, unless otherwise
stated, (4) the instrument must be in
an environment that meets the
limits described in
Table 1-2 .
Any applicable conditions
not listed above are
expressly stated as part of that
characteristic . Environmental
characteristics
are listed in Table
1-2 and Physical characteristics are listed in Table
1-3 .
Characteristic

I

PerformanceRequirement
Deflection Factor
(Volts/Div)
Calibration Range
Gain
Ratio Accuracy
Uncalibrated (Variable)
Vertical Linearity
(1 kHz square wave)
Invert Deflection Factor Ratio
Common Mode Rejection
Ratio
(using ADD,
INVERT)
Bandwidth (1 ps to 50 ns/div)
AC Coupled Low-Frequency Bandwidth
Risetime (ETD)
Overdrive Recovery
SPECIFICATIONS
TABLE
1-1
Electrical
Characteristics
VERTICAL
5 mV/Div to
5 V/Div in 1,2,5 sequence .
Within
2%
with AOR GAIN adjusted at 10 mV/Div
.
General Information-7D20
Continuously variable ; VARIABLE
extends deflection factor
to at least 12 .5 VOLTS/DIV
0 .12 Div or less
expansion or compression of a center screen 2
Div
signal positioned anywhere
within the t4 division graticule area .
1 :1 within 1% .
At
least 10 :1, do to 25 MHz .
Dc to 70 MHz .
10 Hz or less .
5 ns or less (6 div signal centered on screen) .
1 ms or less to recover within 1
div with the VOLTS/DIV set at
5 mV and an overdrive signal of ±1 .5 V .
Revised DEC 1984

~
"3

General
I nformation-7D20
Characteristic
Maximum
Input Voltage
DC Coupled (DC+Peak AC)
AC Coupled (DC+Peak AC)
Input R and C
Resistance
Capacitance
Signal Isolation
between Channels (8 Div Ref)
Noise (Full scale = 10 .24 Divisions)
10 mV/Div to 5 V/Div
5 mV/Div
Phase Match Between Channels
Sensitivity
AC
Coupled
AC
LF REJ
AC HF REJ
DC HF REJ
DC
Max Signal
P-P
Programmed Trigger Levels
Resolution
Accuracy
TABLE 1-1 (CONT)
Electrical Characteristics
Performance Requirement
250 V, 1 kHz or less .
400 V, 1 kHz or less .
Approximately 20 pF .
100 :1 up to
20 MHz .
Mean value of 50 measurements taken at 0 .02
Division increments .
55 dB Full Scale/RMS Noise .
52 dB Full Scale/RMS
Noise .
2 Degrees at 10 MHz .
TRIGGER
Triggering

Minimum Vertical Signal
Required
Frequency
Range Internal
Ext . Ext+10
30 Hz-30 MHz

0 .4 Div

60 mV
30 MHz-70 MHz

I

1 .0 Div

I

150
mV
50 kHz-30 MHz

0 .4 Div

60 mV
30 MHz-70 MHz

I

1.0
Div

I

150
mV
30 Hz-30
kHz

I

0 .4 Div

I

60 mV
DC-30 kHz

I

0 .4 Div

I

60
mV
DC-30
MHz

0 .4 Div

60 mV
30 MHz-70MHz

I

1 .0 Div

I

150 mV
Nominal Range

+6 .35 Div . I

+0 .992
V
-6 .4 Div .

-1 .000 V
Internal

~

±(5% of programmed
level
+0
.25 Div .)
±6 Div

I

±1 .0 V
30 Hz-200 Hz

2 .0 Div

300 mV
200 Hz-30 MHz

0 .6 Div

90 mV
30 MHz-70 MHz

I

1 .2 Div

I

200 mV
0 .05 Div .

I

7 .8 mV
External

±(8%
of programmed level x 156 mV +100 mV)
External=l0

±(12% of programmed
level x
1560
mV
+1000
mV)
0 .6 V
1 .5 V
0 .6 V
1 .5 V
0
.6
V
0 .6 V
0
.6
V
1
.5
V
±10 V
3 .0 V
0 .9 V
2 .0 V
78 mV
+9 .92 V
10 .00 V
REV MAR 1984

Characteristic
Ext Trigger Input
Resistance
Capacitance
Maximum Input Voltage (DC + Peak AC)
SH1
_AH1
T5
L3
_SRI
RL1
_PPO
DC1
DT1
CO
TABLE 1-1 (CONT)
Electrical Characteristics
1 Mfg, ±10%
.
DIGITIZER
Acquisition Window

~

Nominally ±5 Div from center graticule line .
Resolution
Vertical

Nominally 0 .04 Div .
Horizontal

I

TIME/DIV
I
Points/Waveform
I
Resolution
Stored Timing Accuracy
1
Cursor

±0 .1
%
of reading
+0, -1
sample interval
±300 ps .
2 Cursors

~

±0 .1 % of reading ±600 ps .
Digitizer Maximum
Sample Rate

~

40 megasamples/second .
Digitizing
Modes
Equivalent Time

1 ps/div through 50 ns/div .
Extended Real-Time

~

200 ps/div to 2 ps/div .
Real-Time

~

50 ms/div to 500 ps/div .
Roll

I

20 s/div to 100 ms/div and EXTernal CLOCK .
External Clock
Input Frequency (MAX)

510 kHz .
TTL

~

<<-5 Vpk .
Functions Implemented (As Per IEEE 488-1978)
Performance Requirement
Approximately 20 pF .
250 V (1 kHz or less) .
GPIB INTERFACE
EXT, 20s-500ps

1024

0 .01 Div .
200ps-2ps

820

0 .0125 Div .
fps-50
ns

1024

0 .01 Div .
Description :
Complete Source Handshake
.
Complete Acceptor Handshake
.
Talk Function Complete (no secondary addressing) .
Listen Function Complete (no secondary addressing)
.
Complete Service Request Capability .
Complete Remote/Local Capability .
No Parallel Poll Capability .
Complete Device Clear Capability .
Complete Device Trigger Capability .
No Controller Capability .
General Information-7D20

General
Information-7D20
Characteristics
Temperature (External Ambient Mainframe
Temperature)
Operating
Storage
Altitude
Operating
Nonoperating
Vibration
Operating
Shock
Bench
Handling
Transportation
Vibration and Bounce
(packaged product)
NetWeight
Droplpackaged
product)
Characteristics
TABLE 1-2
Environmental Characteristics
Information
0 to +40°C
in 7403N/7603 without fan (fan
kit is available) .
0 to +45°C in other 7000-series
mainframes .
-55° C to +75° C .
15,000 feet (4 .6 Km) .
To 50,000 feet (15 .2 Km)
.
NSTA, PROJECT 1
A-B-2 .
TABLE 1-3
Physical Characteristics
Information
Approximately 8 .5
Ib, 3 .9 Kg .
Dimensions

~

See Figure 1-2 .
Tested to MIL-T-288000
SECT . 4 .5 .5 .3 .1 Type
2, Class 5, Style E&F .
Tested to
MIL-T-288000 SECT . 4 .5 .5 .4 .1
Type 2, Class 5, Style E&F .
Tested to
MIL-T-288000 SECT .
4
.5 .5 .4 .3
Type 2, Class 5, Style
E&F .
National
Safe Transit Association,
Preshipment Test Procedure .
NSTA, PROJECT 1 A-B-1 .
STANDARD ACCESSORIES
1 ea . . . . .
. . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . .. .
Operators
Manual
1

ea . . . . ..
. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . .
. . . . . . . Service
Manual
For more detailed
information, refer
to the tabbed Accessories page
at the rear of this
manual .
OPTIONAL
ACCESSORIES
(not included
The
following accessories
are available for use with the
7D20 . Refer to the
tabbed Accessories page
at the rear of
this
manual
for more detailed
information .
1 ea . . . . . . . . . . . . .. ..
. . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . Circuit-Board
Extender
3
ea . . . . . . . . . . . . . . . . . . """"""""""""""" ~ """""" -~~~~~~~~~~~~~~~~~
7000-series Plug-In
Flexible Extenders
1 ea . . . . . . . . . . . . . . . . . .~ """""""""" ~~ """"""""""""
~
.Internal
GPIB Cable for use
with R7603 Option 20
REV OCT 82

127

2
06
5 .00

8
.11
371
14 .60
NOTE
: TOP FIGURES ARE IN MILLIMETERS
AND THE BOTTOM FIGURES ARE IN INCHES .
!~li!il!! " ~!O!~!~Q!
General Information-7D20
W

-IY'~IYI

1 1
Figure 1-2 . Dimensional Drawing .
3858-04