Tektronix 7D20 User manual

OPERATORS

PRODUCT GROUP 42
MANUAL
070-3857-01

T E K MANUAL
ORS ~70~3g57-T~IGROUP
42
First Printing JUL 1982
Revised MAY 1983
7D20
Programmable Digitizer
With Options
Serial
Number
PLEASE
CHECK FOR CHANGE
INFORMATION
AT THE REAR
OF THIS MANUAL
T~ktronoc~

L_
INST~UCTIE'?NS
Ft?R C .~?~i1Pt
:L~"~'iNG THE
SOFTWARE/FIRMYVAHL~
:PERFGR~iIANCE
RgfidRT
Please
type or print dearly
.
We
a separate
Softwnre/Firmwere Performance
Report (SFPR) for each
problem .
SECTION A
Fill in the aerial
number of the 7D20 PROGRAMtiAABt£
DIGITIZER . Preen
the 10 key on
the
7D20
and copy the entire
IMe of Version
Information,
beQinntng
with T£K17D20 .
111 .

SECTION
B
'Use your
complete company maigng
address . Please include the name and '
phone number
of the person reporting
the error . Aleo, be sure to fill in
the
name of the person
submitting the
SFPR .
IV :

SECTION-
e
Check
t#~e reason for report
end whether the error is
reproducible . We :
cannot properly evlauate
tfie Rrobiem
if
we have
difficulty in ~eproduoin~
the error :
SECTION D
Give a complete descriptiat of , the
system configuration
on which -the
~ problem occurred . Please include
relat8d Peripherals,
interlaces ; options,
and Operating system
.
Yi
.

SECTION E
Describe
the problem ,completely . include any
information which might t~elp
._
in evakrat
ng the errorvvith the SfPR . If you have
determined a procedureto
avoid
titie error condition ; please include
this procedure . If
this problem
preveftts
you f~om,aceorttptishfng any useful
work with the product, please
state this fact
. Be sure to include with the SFPR
eny information (Programs,
listings~'hard
copies, etc .) which will
help us'dupticate your problem
:
SECTION
F

'
This
seCtfon is for use by Tektronix
Lab 3cop~ Software
Maintenance
personnel . DO NOT WRITE N THIS
SPACE :
Vlll .

Mail alt Copies pf the
SoftwarelFirmware Performance
deport to :
TEKTRONiX,~ INC .
LAB 'SCOPt=S SOFTWARE
M'AINT£NANCE
P
.O :
BOX 500 DEL . STA . 39-285
SEAVERTON, OREGON 97077

7D20
PROl~AMR~A1iLir DiQ1TlilrR
$OF7WAR~1FtRMWAR~
P~RFCRMANC~
R~PQRT

TABLE
OF
CONTENTS
7D20 Operators
Page
OPERATORS SAFETY SUMMARY . . . . . . . ............................. . . . . ~~~~ ~x
DESCRIPTION ....................... . ..
. . . . . ........................... . . . . . xii
GENERAL
INFORMATION
DESCRIPTION ........................... . . . . . . ................
1-1
ORANGE COLOR USED IN THIS MANUAL . . . . ................
1-1
TECHNICAL MANUALS .................... . . . ...........~~~~~
1-1
OPERATORS MANUAL .................. . . . . . . .............
1-1
SERVICE MANUAL ..................... . . . . . . .............
1-2
INSTALLATION . . . . . . . ........................... . . . . .
. .......... 1-3
RACKMOUNT MAINFRAMES .................. . . . . . . ......-~-~
1-4
COMPATIBILITY . . . . ............................. . . . . ..........
1-4
PACKAGING FORSHIPMENT .................... . . . ..........
1-4
SPECIFICATIONS . . . . . . . . . . . . . . . ........................
. . . . . . ....... 1-6
STANDARD ACCESSORIES . . ........................... . . . ......
1-12
OPTIONAL ACCESSORIES (not included) ............... . . . . . . ...
1-12
OPERATING INSTRUCTIONS
OPERATION ..... . . . . . . . . .... . . ...........................
. . . . 2-1
CONTROLS AND CONNECTORS . . . ........................... . ~ - ~ 2-1
DISPLAY ................. . . . .
. . .
. . . . ........................
. . . . 2-1
FUNCTIONKEYS ......... . . . .
. . . . ........................... . 2-8
ERROR MESSAGES
...... . . . . . . . . ........................... .
2-8
GET-ACQUAINTED
EXERCISES
..... . . . . .......................~~~~~.
2-9
PRELIMINARY SET-UP
.......... . . . . . . . . .........................
2-9
DISPLAY
CALIBRATION ............ . . . . . .......................-
2-10
DISPLAY
ADJUSTMENT PROCEDURE ........................ 2-11
INITIALIZE ............................
. . . . . . . . .................. 2-14
OBTAINING A
WAVEFORM DISPLAY . . . . . . . . . . .................. 2-16
EXERCISES ...........................
. . . . . . . . .................. 2-17
INDEX . . . . . ..............................
. . . . . . . . .............. .
2-17
EXERCISE 1-USING THE VERTICAL CONTROLS ................
2-17
SETTING THE INPUT COUPLING ......... . . . . . ............... 2-19
HOW TO SET THE VZR (Vertical Zero Reference) ............
2-19
CHANGING THE VERTICAL SENSITIVITY
(VOLTS/DIV) ........ 2-21
USING THE VARIABLE VOLTS/DIV CONTROL . . . . ............
2-21
EXERCISE
2-USING THE AOR (ACQUIRE) MODE . . . ............
2-22
EXERCISE 3-USING THE WAVEFORM MEMORY
. . . . . . ......... 2-24
COPYING AND DISPLAYING A WAVEFORM .... . . . . . .........
2-25
A NOTE ABOUT THE DSW (Displayed
Waveform) ORDER .... 2-27
EXERCISE 4-CHANGING THEDESIGNATED
CURSOR
WAVEFORM . . . . . . . . . . . . . . ...........................
. . . . . . . . ... 2-28
REV SEPT 82

7D20 Operators
TABLE OF
CONTENTS (CONT)
Page
OPERATING
INSTRUCTIONS (CONT)
EXERCISE 5-HOLDING A WAVEFORM IN MEMORY .......... .
.2-31
EXERCISE 6-USING THE CURSORS .......................... . . 2-32
CURSOR 1 ............... . . . . . . .............................
2-32
CURSOR 2 AND THE
f
(function
shift) KEY ................. 2-34
USING THE CURSORS
INDEPendently
OR
ALIGNed ......... 2-36
EXERCISE 7-USING THE CURSOR
WAVEFORM DISPLAY
MODIFIER KEYS .............
. . . . . . ............................. 2-42
HOW TO VERTICALLY REPOSITION
THE CURSOR
WAVEFORM .............. . . . . . . . . . ..........................
2-43
HOW TO VERTICALLY
EXPAND
OR
COMPRESS THE
CURSOR WAVEFORM ....... . . . . . . ..........................
2-46
USING HMAG (HORIZONTAL
MAGNIFY) ANDCURSOR
MOVEMENT
................. . . . . . . .......................... 2-49
HMAG AND
THE REFerence WAVEFORM ................... 2-52
HOW
TO USE
HMAG ALL . . . . . . . . ..........................
2-56
USING THE VS (versus) FUNCTION . . . ....................... 2-63
USING
THE REFerence WITHVS . . . . . ....................... 2-65
VECTORS AND DOTS .......... . . . . . . .......................
2-66
EXERCISE 8-USING THE AVERAGE AND ENVELOPE
FUNCTIONS AND
SET N .............. . . . . . . .................... 2-67
EXERCISE
9-DIGITIZING MODES AND THE TIME/DIV
CONTROL ............................ . . . . . . ....................
2-72
REAL-TIME AND EXTENDED REAL TIME . ....................
2-72
ROLL MODE AND EXTernal CLOCK . . . . . . ....................
2-72
EQUIVALENT TIME MODE ............ . . . . . . .................
2-73
EXERCISE 10-SETTING THE TRIGGER POSITION
............... 2-74
EXERCISE 11-USING THE HOLD NEXT . . . . . . . .................
2-77
REAL-TIME AND EXTENDED REAL TIME
. . . .................. 2-78
EQUIVALENT TIME MODE ............. . . . . . .................
2-78
ROLL MODE AND EXTernal CLOCK .... . . . . . . . ...............
2-78
EXERCISE 12-USING THE EXTERNAL CLOCK . . . . ..............
2-79
DETAILED OPERATING INSTRUCTIONS ......... . . . . . . ..............
2-81
INTRODUCTION
........................... . . . . . .............. 2-81
POWER-UP
.................................. . . . . . . . . ........... 2-81
MENU FUNCTIONS
............................ . . . . . . ........... 2-83
MASTER
MENU SELECTIONS ............... . . . . . . ........... 2-83
1,#
STOREPANEL #
.................... . . . . . . ...........
2-83
2,# RECALL
PANEL # ...................... . . . . . ......... 2-84
3
DISPLAY CAL PATTERN .................. . . . . . . ........ 2-84
4
UTILITIES
................................
. . . . . . ........ 2-84
TEST

MENU ................................... : . . . . . .... .
2-86
PROMPTS AND WARNINGS ......................... . . . . . . ...~-
2-88
DISPLAY CALibration ............................. . . . . . . . . . . .
2-90
REV SEPT 82

7D20
Operators
TABLE OF
CONTENTS (CONT)
Page
OPERATING
INSTRUCTIONS (CONT)
READOUT DISPLAY .............................. . . .
............ 2-91
CURRENT CONTROL SETTINGS AND PROMPT FIELD .........
2-91
CURSOR
WAVEFORM PARAMETERS ............. . . . ........
.2-91
VERTICAL CONTROLS . . . ........................... ~ ~ - ~ ~ ~ ~~~~~~
2-92
SIGNAL CONNECTION ........................... . . . . . . .....~
2-92
INPUT CONNECTORS . . . . ........................... . . ~ ~ ~ ~ ~~~
2-92
VOLTS/DIV (VARIABLE) . . ........................... . . . . . ~ ~ ~ ~
2-92
POSITION ....... . . . . . . . . . . . ...........................
. . . . . . 2-93
COUPLING (INPUT) . . . . . . . . . .............................. . .
. 2-93
AOR (ACQUIRE) GAIN . . . . . . . . . ...........................
. . . 2-94
CH2 INV .............. . . . . . . . . ...........................
. . . 2-94
ACQUIRE MODE ............. . . . . . . . . ...........................
2-95
CH1 ~ 1 .................
. . . . . . . . ........................... 2-95
BOTH .................... . ..
. . . . . ........................... 2-95
ADD ~ 1 .................
. . . . . . . . . . . ........................
2-95
CH2
~
2
....................... . . . . . ....................... .
2-96
HOLD .............................
. . . . . ........................
2-96
.f
(shift function) ..................
. . . . . . . . .....................
2-96
TIME/DIV ............................
. . . . . .....................
2-96
DIGITIZING MODES ................ . . . . . . . . ..........-~~.~~~~
2-96
Extended
Real-Time Digitizing (ERD) . . . . . ..................
2-98
TRIGGERING
............................ . . . . . ..................
2-99
SOURCE
............................. . . . . . . . . ...............
2-99
COUPLING ........................... . . . . .
. . . ............. .2-100
MODE . .................................. . . . . .
.............. 2-101
+SLOPE . . . ................................. . . .
. . . . . .......... .2-103
TRIG'D . . . . . . . ..............................
. . . . . . . . . . . ....... .2-104
LEVEL ... . . . . . ................................. . . . . .
. . . ....... .2-104
a
TRIG

POS ~
. . . .................................
. . . . . . ....... 2-104
HORIZ POSITION .................................
. . . . . . . . .... .2-105
VECTOR ... . . . . . . . . . .................................
. . . . . . .... 2-105
MEMORY DISPLAY . . . ...............................
. . . . . . . . . . 2-105
COPY ........ . . . . . . ..............................
. . . . . . . . .
.2-106
CSW .... . . . . . . . . ..............................
. . . . . . . . .... .2-107
.f
CSW

REF

. .

. .

. . . . . . . .. .

.........

. .

.......

. .

....... . .

. . . . .

2-107
CURSOR WFM ..... . . . . .
. . . ............................... .
.
.
.2-108
VPUP4 AND VPDNb (Vertical
Position Up and Vertical
Position Down) ........ . . . . . . ..............................
. 2-108
VCMP
4
AND VXPD
a
(Vertical Compress and Expand) ..... .
2-109
HMAG (Horizontal
Magnify) . . . . . ............................
2-110
f,HMAG
ALL
.............
. . . . . ............................
2-110
VS
.................... . . . . . . ..............................
.2-110
REV SEPT82

III

7D20
Operators
TABLE
OF
CONTENTS
(CONT)
Page
OPERATING INSTRUCTIONS
(CONT)
CUR SO RS

........................
. . . ........................
. .2-112
CURSOR
COORDINATES . . . . . . ., .  .
 .  , .  .2_112
CURSORS
AND MAGNIFIED
WAVEFORMS .....,. , , . , , ,,,,,,
2-1
13
a 1~

. . . . . . . .
. . ...........................
. . ....
. . ........ .2-114
a2~ ...............................
. . . . . . . . ..............
.2-115
DONDO FF ......................
. . . . . ....................
.2-115
IN D E
Pendent ............
. . . . . ... .
. . .....................
. . .2-115
A LIG
N

........... .
. . . . . . . . . . . .................... .
. . . . . . . . .2-115
SET
N ......... . .
.... . . ...........................
. . .
..
. ..... .2-115
AVE
........... . . . ...........................
. . . . . .
........... .2-116
~ . AVE N ...................-...........
. . . . .................
.2-118
ENV
. . ..............................
. . . .......................
.2-118
f,
ENV N ................
. . . . . . . . . .....................
. .
. . . .2-120
f
.
TEST
.... . .
.
..... . . ..
.
. ........................
. ........ . . .2-120
RQS
(REQUEST SERVICE) .... ., . ., ., .  , .  ,...

2-121
f
ROS # . .
..............................
. .
. . . ..... .... . . . . .
. . 2-121
REMOTE
ONLY (indicator) ... ., ., ., .  , .  , . . . ., .,
.
._2_121
ID (ADDRed
Indicator) . . ., . ., .  , .  , . ., . . . ._ ., .,
.,2-121
EXT CLOCK
......... . . . . .
.... . . ....................
. . .........
2-122
EXT TRIG
..... . . . . . . . . . .
. ........................
. ........... .2-123
G PIB

(connector)
. . . . ...........................
. . . .. ........... 2-123
OPERATIONAL
THEORY
BLOCK DIAGRAM
DESCRIPTION
... ., .  , .  , .  , ., ., . ., 3-1
OVERALL
BLOCK DIAGRAM
DESCRIPTION . . ., .  , .  3_1
CHARGE
COUPLED DEVICE
(CCD) OPERATION
. . . .,.,,,...,,,,,,,
3-4
DIGITIZING
MO DES ...................
. . . . . ......................
3-4
WAVEFORM
DISPLAY .......
. . . . . . . . ...........................
3-11
GPIB
IN TR OD U
CTIO N ...............................
. . . ................

4-1
KEY

FEATU
RES ......................
. .
. ..................... .

4-1
SECTION
CONTENTS .......  ., .  , ._  .  , .  ,... ., ..
 .
4-2
G
PIB

DES CRIPTION .........
. . . . . .
. . . ........................
. . ....
.

4-2
POWER

U P .... .
. . . . . . . . . ...........................
. . .... . . .....

4-3
GPIB MODE,
TERMINATOR,
AND ADDRESS
SELECTION .....,..,
4-4
ADDRESS
SELECTION ...... ., .  ,..  . ., .,
.  , .
4-5
TERMINATOR
SELECTION .... ., ...  ,_ .  ,..
.,_ . 
4-6
MODE
SELECTION ....... .
. . . . . . . . . . ..........................
4-6
ALTERNATE
GPIB STATUS
INDICATORS ......,,,,,,,. , , , , , , , . 4_~
REMOTE AND
LOCAL OPERATION .....  .  ,..  ...  .
q_~
IN DICATO
RS . . . ..............................
. . . . . . ..............

4-8
GPIB
INTERFACE FUNCTIONS
........  , ., .  , .  ,..  . .  , ., q_g

7D20 Operators
TABLE OF
CONTENTS ~CONT)
Page
GPIB (CONT)
MESSAGES .... .
. . . . ......................... . . . . . .................
4-9
GPIB
INTERFACE MESSAGES .............. . . . . . ... .~~~~~~~~~~~~~
4-9
TALK
AND LISTEN ADDRESS (MTA, MLA)
. . . ................. 4-9
SERIAL POLL ENABLE COMMAND
(SPE) .... ................. 4-10
GROUP EXECUTETRIGGER (GET)
.......... . . . . . ............. 4-10
DEVICE CLEAR (DCL) . . . ...................... . .......~~~~~~.
4-10
SELECTED DEVICE
CLEAR (SDC) .............. . . . . . ......~~~~ 4-10
INTERFACE CLEAR (IFC) . . . ................
., ..... ...........
4-10
DEVICE-DEPENDENT MESSAGES .................... . . . . . ~~~~~~~
4-11
INTRODUCTION .......... . . . . ....................
. . . . . ...... .
4-1 1
COMMAND USAGE ....... . . . . . ...................... .
. . . ...
.4-11
QUERY USAGE .............
. . . ..................... . . . . .
.... 4-13
DATA TRANSFERS
.......... . . . . .................. .
. .
. . . . .
. . 4-16
Readout ....................
. . . ......:..............
. . . . . . 4-17
Text .........................
. . . . ......................
. . . 4-17
Waveforms .................. . . . . .........................
4-19
Waveform
Curve ............... . . . ........................
4-23
Waveform
Preamble and Curve . . ........................~
4-24
SERVICE REQUESTS
....................... . . . .....................
4-25
USING SRO . ...........................
. . ......................
4-25
Service
Request Masks .............. . . . .......-~~~~~~~~~~
4-31
EVENT QUERIES ........................
.
. ...................
4-32
Event Classification ...................... . ........~~~~~~~~
4-35
Event Codes . . . . ........................
. . . .............. .
4-36
USER-REQUEST FUNCTIONS ................ . . . . ~~~~~~~~~~~~ ~
4-37
COMMAND LIST . . . . . . . . ......................
. . . . ............ .
4-38
SAMPLE PROGRAMS . . . . . . . ......................
. ............
.4-77
INTRODUCTION ..... . . . . . . . ....................
. . . . ..........
4-77
SAMPLE PROGRAM LIST . . . ..................... . . . ..~~~~~~~ 4-77
4050-Series Operating
Programs ............... . . . . ...~~~-
4-78
4050-Series Application
Programs ................. . .......
4-89
4041 Operating
Programs . ....................... ~ ~ ~ ~ ~ ~~~
4-97
4041
Application Programs . . ..................... ~ ~ - ~ ~ ~ ~
4-108
APPLICATIONS
APPLICATION 1-MONITORING
SLOWLY CHANGING EVENTS
WITH THE 7D20 AND 7D1 1 ............. . . . . . .........~~~~~~~~~~
5-1
INSTRUMENTATION SET-UP #1 .............. .............~~~~~~~
5-2
APPLICATION 2-ULTRASONIC,
NON-DESTRUCTIVE TESTING
USING 7D20 . . . . . . .............................
. ............... .
5-3
INSTRUMENTATION SET-UP
#2 ................. . ........~~~~~~~~
5-4
APPLICATION
3-MONITORING INTERCELLULAR
NEURONAL
DISCHARGE
.......................... . . . . .......................
5-6

7D20
Operators
TABLE OF CONTENTS
(CONT)
Page
APPLICATIONS (CONT)
APPLICATION 4-MEASURING PULSE
JITTER, FREQUENCY
SHIFT, AND AMPLITUDE
VARIATIONS USING THE 7D20 .........
5-7
APPLICATION 5-AC LOADLINE
ANALYSIS USING THE
7D20 AND 7A13 .....................
. . . . . . . . ...................
5-9
INSTRUMENTATION
SET-UP #5 ....... . . . . . . . . ...........~~"""""
5-10
CALIBRATION
........................ . . .... . . ...............
5-11
OPERATION
. . ........................... . . . . . ...............
5-11
APPLICATION
6-USING THE7D20WITH THE 7854 FOR
WAVEFORM PROCESSING .................. . . . """"""""""""""""
.5-13
INSTRUMENTATION
SET-UP #6 ................ . . ... . . . .....""""
5-14
MANUAL
TRANSFER ....................... . . . . . . . . ..""""". .
5-15
COMPUTER
CONTROLLED TRANSFER ....... . . .... . . .........
5-15
VI
INSTRUMENT
OPTIONS
INDEX
CHANGE
INFORMATION
NOTE
Service Personne%~ Refer to
the 7D20 Service Manual for
information
on installation, Theory
of Operation, Maintenance, Checks
and
Adjustment, Parts List
and Diagrams .
MANUALS (Standard
Accessories)
7D20 Operators
7D20 Service
RELATED
DOCUMENT
The tabbed "ACCESSORIES"
page at the rear of the
Service Manual lists the
Tektronix part numbers
for all Standard Accessories provided
with this product .
Also, Section 1, General
Information, contains a brief
basic-content description
for
the following publications
:
REV
SEPT
82

Figure No .

Page
1-1

7D20 Release
Latch ........ . . . .................. .~~~~~~~~~~~~~~~
1-4
1-2

Dim ensional

Drawing

................ . . . ........ .~~~~~~~~~~~~~~ .

1-13
2-1

7D20 Controls and
Connectors .... . . . . . . ............~~~~~~~~~~~~ ~
2-2
2-2

7D20 Display
........................... . . . . . . ...................
2-6
2-3

Power-up
SELFTEST PASS display ...... . . . . . . ..........~~~~~~~~ 2-10
2-4

DISPLAY CAL adjustments .............. . . . . . . ........-~~~~~~~~~
2-10
2-5

7D20
MASTER MENU ........................ . . .~~~~~~~~~~~~~~~
2-11
2-6

7D20 DISPLAY CAL PATTERN ............. . . . . . . ........~~~~~~.
2-11
2-7

Adjust

HO RIZ

CTR

. . . . . . . ...........................
. . . . . . ...... 2-12
2-8

Adjust

H ORIZ

GAIN . . . .......................... .~~~~~~~~~~~~~~ .

2-12
2-9

Adjust
VERT CTR and VERTGAIN ............... . . . . . . . . ...~~~~
2-13
2-10

Adjust VECT LIN .... . . . . . . . ...............................
. . . . . . 2-13
2-11

Correctly adjusted DISPLAY CAL
PATTERN ............. . . . ...... 2-14
2-12

Sine-Wave display . . . . . . . . . . . . . ...........................
. . . ... 2-16
2-13

Vertical controls ............. . . . . . ........ .~~~~~~~~~~~~~~~~~~~~~
2-18
2-14

VARIABLE VOLTS/DIV readout . .............................~ ~
. ~
2-21
2-15

AOR MODE keys ......... . . .
. . . . . ...........................
. . . 2-22
2-16

MEMORY DISPLAY keys ..... . . . . . . . . .................~~~~~~~~~~
2-24
2-17

Sine-wave display ............
. . . . . . . . ...........................
2-24
2-18

CSW REF key ..................
. . . . . . . . ........................
2-28
2-19

Cursor Waveform readout
.......... . . . . . . . . .......... .~ .~~~~~~-~
2-28
2-20

The

H 0 LD

key .............................
. . . ..................

2-31
2-21

Cursor 1 .............................
. . . . . . . . ..................
2-33
2-22

Cursor keys ..............................
. . . . . ..................
2-33
2-23

The shift function key ...................... . .~~~~~~~~~~~~~~~~~~
2-34
2-24

Using the cursors to
measure different parts of the
sa m e

Waveform
. . . . . . . .......................... . . . .
. . . . . . ......

2-41
2-25

Cursor Waveform
keys ........................ .~~~-~~~~~~~~~~~~~
2-42
2-26

Conditions
under which the CURSOR
WFM keys are active
for

~aveform s

1

or

2

.................... .~~~~~~~~~~-~~~~~~~~~~

2-44
2-27

Vertical
compress and expand keys ......................~~ ~ ~ ~ ~ ~ 2-46
2-28

Horizontal
Magnify key .... . . . . . . .............. .~~~~~~~~~~~~~~~~~
2-49
2-29

R
EFerence Waveform

key ................ . . . . . .... .~~~~~~~~~~~~~
2-52
2-30

Horizontal
Magnify ALL waveforms key . . . . ....................~
2-56
2-31

The VS
(Versus) key ..................... . .~~~~~~~~~-~~~~~~~~~~~
2-63
2-32

VECTOR key
.................. . . . . . ...........................
. . 2-66
2-33

Waveform processing key ..... . . . . . ............. .~-~~~~~~~-~~~~~
2-67
2-34

The TIME/DIV-digitizing modes
selector ........................
2-72
2-35

TRIG ger

POSition

keys ............. . . . . . . .~~~~~~~~~~~~~~~~~~~~~~
2-75
2-36

Trigger

PO Sition

readout ............ . . . . . .......... .~~~-~~~~~~~~
2-75
2-37

The HOLD NEXT key ................. . . . . .~~~~~~~~~~~~~~~~~~~~-
2-77
2-38

7D20 MASTER MENU ...................... . . .-~~~~~~~~~~~~~~~~
2-83
2-39

DISPLAY CAL PATTERN ........................ . . . . . .~~~~~~~~~~~
2-85
2-40

UTILITIES MENU ............................
. . . . . .............. .
2-85
2-41

External

Clock

prom pt .......................... . . . . .~~~~~~~~~~~~

2-87
2-42

TEST MENU . . .................................
. . . . . . ...........
2-87
2-43

SELFTEST PASS message
. ........................ : .~~~~~~~-~~~~
2-87
2-44

Self Test Fail . . . . . . . . .
. ............................ .
. . . . . . ...... 2-88
2-45

VO LTS/DIV

readout . . . . . . . ................. .~-~~~~~~~~~~~~~~~~~~
2-92
REV
SEPT 82
LIST
OF
ILLUSTRATIONS
7D20 Operators

7D20 Operators
LIST OF ILLUSTRATIONS (CONT)
Figure No .

Page
2-46

VARIABLE VOLTS/DIV readout indicator . . . . . . . ..................
2-93
2-47

Cursor placement for AOR GAIN adjustment ....................
2-94
2-48

CH 2 INVert readout . . ........................ . . . ..............
.2-95
2-49

TIME/DIV readout ...................... . . . . . . ..................
2-97
2-50

EXTernal clock readout .................. . . . . . . ..................
2-98
2-51

Triggering on negative slope ............... . . . .................
2-103
2-52

Trigger POSition readout ................... . . . . . . ..............
2-105
2-53

DSW (displayed waveforms)
readout ........ . . . . . . .............. 2-106
2-54

7D20COPY prompt ......................... . . . . . .............
.2-107
2-55

DSW readout with
R (Reference) Waveform displayed .......... 2-108
2-56

Cursor waveform with VZR
(Vertical Zero Reference)
altered by VPUP

. . . . . . . . . . ..................... . . . . . . .......
.2-109
2-57

HMAG Waveform displayed with
its reference waveform ...... .2-110
2-58

Cursor Waveform VS
(Versus) prompt ............ . . . . . . . . . ..... 2-111
2-59

CSW versus readout . . ........................ . . . . . . ..........
.2-111
2-60

Cursor
coordinate readout . . . ........................ . . . . . . .... .2-113
2-61

Cursor
coordinate readout with VS Waveform displayed ........ 2-113
2-62

Cursor coordinate readout when both cursors are on
(DON) . . .2-114
2-63

Cursor 1 location on HMAG'd Waveform ......... . . . . . . ........
2-1 14
2-64

Set N readout prompt . . . ........................ . . . . . . .......
.2-116
2-65

The AVE readout . . . . . . . . ........................ . . . . . . ........
2-116
2-66

The ENV readout . . .... . . ........................ . . . . .~~~~~~~~~ 2-119
2-67

ID MENU ........ . . . . . . . . . . . ............................ . . . . . . .
2-122
2-68

EXTernal clock readout .... . . ........................ . . . . . . .... .2-122
3-1

7D20 Overall Block Diagram . . . . . . ........................ . . . ....
3-2
3-2

Simplified Block Diagram of Charge Coupled Device (CCD)
....... 3-5
3-3

Non-Fast In, Slow-Out Time Base Modes
(A) Roll Mode ;
(B) Real-Time Digitizing (RD) Mode ..................... . . . . . . ....
3-7
3-4

Fast-In, Slow-Out Time Base
Modes ; (A) Extended Real-Time
Digitizing (ERD) Mode ; (B) Equivalent
Time Digitizing ETD Mode . . 3-8
3-5

Extended Real-Time signal
acquisition capability of the 7D20 . .... 3-9
4-1

GPIB system configuration
. . . .
. . . . ........................ . . . . ...
4-3
4-2

Function selection display . . . . . . . . . ......................... . . . . . .
4-5
4-3

Address selection display . . . . . . . . . ........................... . . . .
4-5
4-4

Terminator selection display . . . . . . . ........................... . . . .
4-6
4-5

Mode selection display
.......
. . . . . . .......................... . . . .
4-6
4-6

Device-dependent vs .
interface messages ..................... . . . .
4-9
4-7

Complex command
format diagram . . . ........................... 4-11
4-8

Simple command format diagram . . . . ...........................
4-12
4-9

NR1
data
format ..................... . . . .......................
.4-13
4-10

NR2 data format ...................... . . . . . .....................
4-14
4-11

NR3
data
format ...................... . . . . . . . . .................
.4-15
4-12

Query
format diagram ............. . . . . . .......................~
4-15
4-13

ASCII
and
IEEE-488 code ............. . . .... . . .................. 4-18
4-14

7D20
status reporting block diagram . . . . .... . . ..................
4-27
4-15

Event
handler flow chart ........... . . . . . . . . ................ .~ .~~
4-28
4-16

Serial poll handler flow chart ......... . . . . . . . . ..................
4-30
4-17

All-event query flow chart ............ . . . . . . . . .............~~~~~
4-33
4-18

Event query flow chart .................. . . . . . . . . ... . .
4-34
y jjj

REV
SEPT 82

Figure No .

Page
5-1

Viewing a reflected pulse signal showing the
cursor position
relative to the trigger pulse . . . ..................... . . . . . . . .~~-~~~
5-5
5-2

Using the ENVeloping mode to show frequency
shift . . . . . . . ...... 5-7
5-3

Using signal ENVeloping and
multi-display feature to
view pulse fitter .............. . . . . . ....................... .
. . . ... 5-8
5-4

Using the 7D20 ENVeloping
mode to show waveform variations . .
5-8
5-5

7D20 display showing safeoperating
areas and other
information .......................
. . ........................
. . . . 5-12
5-5

Example of manufacturer's
spec's ... . . . . . . .................~~~~~ 5-12
Table No .

Page
1-1

Electrical Characteristics .... . . . . .................... .~~~~~~~~~~~~
1-6
1-2

Environmental Characteristics ..... . . . . . ...................~~~~~ ~
1-11
1-3

PhysicalCharacteristics .............. . ... ..................~-~~~
1-11
2-1

Control Settings at
Power Up ....... . . .....................~~~.. 2-81
2-2

Front Panel Settings
that canbe Stored and Recalled ...........
2-84
2-3

7D20
DIGITIZING MODES ............ . . . . . .................~~~~~
2-97
2-4

Digitizing
Mode Bandwidth ............... ......................~
2-98
2-5

Equivalent
Time Digitizing Mode Trigger Requirements .........
.2-103
2-6

Number of
Points Averaged for Each Displayed Point
in
ROLLMode
. . . . . ........................ . . . . ..................
.2-117
2-7

Number of
Points Averaged for Each Max and Min
Pair of
Displayed
Points in ROLLMode ............... . . . . . . ...... . . . ~ ~
2-119
3-1

Summary of Time Base Modes ............ . . . . . ...........~~~~~~
3-5
3-2

ETD Mode ...... . . . . . ......................
. .. .
. ................
3-10
3-3

7D20 Waveform Display Position .............. . . . . . .............
3-1 1
4-1

MEMORY DISPLAY Keypad Code
..............
. . . . . ..............
4-7
4-2

7D20 GPIB Interface Functions ................ . ... .............~~
4-8
4-3

Supplemental Characters .......................... . . . . ....~~~~~~ 4-17
4-4

7D20 Status Bytes .... . . . ........................ . . . . . ~~~~~~~~~~ 4-26
4-5

Service Request Masks ... . . . . ...................... . ~ ~ ~ ~ ~ ~ ~ ~~~~
4-31
4-6

Event Codes .............. . . . . . ........................
. . . . . . . . . 4-36
4-7

7D20 Command Set ..... . . . ........................ . . . . . .......
4-39
5-1

Effective Number of Points When
Using ENV While ROLLing ..... 5-6
REV SEPT 82
LIST OF TABLES
7D20 Operators
LIST OF
ILLUSTRATIONS (CONT)
IX

7D20 Operators
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
AS
MARKEDON EQUIPMENT
TERMS
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 .
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 .
IN THIS MANUAL
© Static-Sensitive Devices .
SYMBOLS
I

This symbol
indicates where applicable cautionary or other
information is
to be found .
AS MARKED ON
EQUIPMENT
DANGER-High
voltage .
Protective ground
(earth) terminal .
Q ATTENTION-refer
to manual .
x

REV SEP 1982

POWER SOURCE
GROUNDING THE PRODUCT
WARNINGS
DANGER
ARISING FROM
LOSSOF GROUND
7D20 Operators
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 mainframe power cord is essential for
safe
operation .
This
product is grounded
through the grounding
conductor of the mainframe power
cord . To avoid electrical
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 .
DO NOT
OPERATE IN
EXPLOSIVE ATMOSPHERES
To avoid
explosion, do not operate this
product in an atmosphere of
explosive gases .
DO NOT
REMOVE COVERSOR
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
unit via a plug-in extender .
REV SEP 1982

X~

7D20 Operators
DESCRIPTION
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
.
The 7D20
features 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 choose seldom used features easily
and quickly .
The
master menu offers a convenient 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 SELFTEST
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
.
Xjj

REVSEP 1982

SE{}T!{)NONE
{~ENERAL!NF[)RK8ATiDN
Thio section io ~he
fim~ p!a~e ~o !ook (or inh»rmotion
ooncerning ~our 7D2O
Prognammab!e Digib~er~ Heno vve
daacri~e ~ha bauic
oon~ent of ~he o~eroko,o and uervioe
nnanua!s whioh
ana at~ndard aoceasories to your nevv
instrument~
VVe a!oo ino!ude a briof ~enara!
deaoription of
tho 7D~0
and exp!ain how 1o instuU it in
a hon~
mminfrome fm' opo~~inn~ !n thia oec~ion
wa ~ive ~he
e!eo1,icu!
.
mnvironman~a!
.
~nd physioe!
oharan&sris~ioo ond
apeoifiom1iona o~ \ho 7D2O
.
!iat ~ha
atandurd and
n*onmmonded aooeoeoriea
'
und
provide a dimenaiona!
druvving nf 1he inutrument~
~hou!d you havo need ~o
napmc~age 1hm inatrumen~
~or ohipment
.
ths~ inform*dion ia
a!en ino!uded~

SECTION
1 CONTENTS
DESCRIPTION . . . . . . . . . . . . . . . .....
. .... . . ............................ 1-1
ORANGE COLOR USED IN THIS
MANUAL
. . . . . . . ...................
1-1
TECHNICAL MANUALS ... . . . . . . . . ...... . . . . . . ......................
1-1
OPERATORS
MANUAL ............. . . . . . .... . . . . . ................ 1-1
SERVICE MANUAL
.......... . . . . . . . . .... . . ...................... 1-2
INSTALLATION ..........................
. . .... . . . . . . . . ................ 1-3
RACKMOUNT
MAINFRAMES ................ . . . . . . . . . . . ............. 1-4
COMPATIBILITY
.............................
. . . . . . . . . . . . . . .......... 1-4
PACKAGING FOR
SHIPMENT ............... . . . . . . . . ... . . . . . . ....... 1-4
SPECIFICATIONS ...............................
. . . . . .... . . ................ 1-6
STANDARD ACCESSORIES ..................... . . . . . . ... . . . . . ......... 1-12
OPTIONAL
ACCESSORIES (not included) ................ . . . . . . . . . . . . . . 1-12
1-0

REV SEPT 82

DESCRIPTION
TECHNICAL
MANUALS
GENERAL
INFORMATION
The 7D20 Programmable
Digitizer is a three-compartment wide
7000-series plug-
in . It provides
simultaneous dual channel waveform
digitizing and a variety of
display features .
Multiple digitizing modes include
single shot, repetitive equivalent
time, and roll
modes . Programmability and
GPIB talk-listen capability allows total or
partial
systemization and data transfer for
more extensive signal processing . Display
readout
provides identification of waveforms,
scale factors, prompting messages,
and cursor
measurements . Waveform storage is
provided for six waveforms, which
can be individually
selected, positioned,
expanded, compressed, magnified, or
displayed in
a Y versus X format . Digital storage
allows multiple averaging and
enveloping along with
post and pretrigger
capability .
ORANGE COLOR
USED IN THIS MANUAL
In using
the operators manual, you
will
notice
that some function names are printed
in orange ink .
The orange color indicates a
shift function which requires that the
f
shift function)
key be pressed prior to
selecting the functions .
Both an
operators and a service manual are
supplied with your 7D20 as standard
accessories . The following
information outlines the content of these
manuals .
Operators
Manual
The operators
manual for the 7D20 contains
six sections of information to explain
the operation
of your instrument . The
content of the operators manual is described
below :
SECTION 1-GENERAL
INFORMATION contains an
instrument description along
with information
for installing the 7D20 into a host
mainframe . We make a
special note regarding
rackmounting and another
about compatibility
considerations . This
section also provides a complete list of
the 7D20 electrical,
environmental, and physical
specifications and characteristics . It also
lists
standard and
recommended
accessories, and gives instructions
for packaging
the instrument for
shipment .
SECTION
2-OPERATING INSTRUCTIONS
provides a general overview of the
instruments
capabilities, controls
and connector information, a series of get
acquainted
exercises, and detailed
operating information .

General
Information-7D20
SECTION 3-OPERATIONAL THEORY provides additional information about the
operation of the 7D20 digitizer . This section discusses the more technical aspects
of the digitizing techniques used by the 7D20 .
SECTION 4-GPIB contains a general description of the GPIB interface, address
selection information, description of the instrument status following power-up,
and descriptions of the commands and messages which can be transferred over
the GPIB . The section also provides a command language index .
SECTION 5-APPLICATIONS illustrates how your 7D20 can be used
in
a
variety
of situations . In this section we combine the 7D20
with other Tektronix products
for some unique and interesting digital
storage application possibilities .
SECTION 6-INSTRUMENT OPTIONS contains descriptions of available options .
Service Manual
Your
service manual contains eight sections of information pertaining to the
servicing needs of your 7D20 . The following is a brief overview of this
manual's
contents .
WARNING
The fol%wing service instructions are
for
use by
qualified personnel
only . To avoid persona/ injury, do not
perform any
service
other than
that contained in operating
instructions unless you are qualified to do
so . Refer to Operators Safety
Summary and Service Safety Summary
prior to performing
any service .
SECTION
1-GENERAL INFORMATION contains an instrument description along
with information for installing the 7D20 into a host mainframe . We make a
special note regarding rackmounting and another about compatibility
considerations . This section also provides a complete list of the 7D20 electrical,
environmental, and physical specifications and characteristics . It also lists
standard and recommended accessories, and gives instructions for packaging
the instrument
for shipment .
SECTION 2-THEORY OFOPERATION provides a basic block diagram description
of the 7D20 along with general and specific circuit analysis that may be useful
for servicing the instrument .
SECTION 3-MAINTENANCE describes routine
and
corrective maintenance
procedures with detailed instructions for replacing assemblies, subassemblies,
and individual parts . Included in this section are full instructions for
troubleshooting the 7D20 using internal diagnostic routines and signature
analysis .
SECTION 4-CHECKS AND ADJUSTMENTS is divided into
three separate parts :
Part I-Functional Check Procedure
used to verify that the major functions of the