Tektronix 2221 User manual

Л
TEK
OPERATORS
MANUAL
070-6530-00
Product
Group
41
C
П
П
п
п
П
2221
DIGITAL
STORAGE
OSCILLOSCOPE
OPERATORS
ПО
П
។
П
П
Л
П
Please
check
for
CHANGE INFORMATION
at the Rear of This Manual
First
Printing
JUNE
1987
Tektronix
COMMITTED TO EXCELLENCE

L
Copyright ©
1987
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
.
U
TEKTRONIX ,
TEK
,
SCOPE -
MOBILE
,
and
registered
trademarks of
Tektronix , Inc.
are
L
Printed in
U.S.A.
Specification
and
price
change
privileges
are
reserved
.
บ
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بال
INSTRUMENT
SERIAL
NUMBERS
Each
instrument
has a
serial
number
on a
panel
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 :
B000000
100000
200000
300000
700000
Tektronix ,
Inc. ,
Beaverton ,
Oregon
,
USA
Tektronix
Guernsey
,
Ltd.
,
Channel
Islands
Tektronix
United
Kingdom ,
Ltd. ,
London
Sony
Tektronix
,
Japan
Tektronix
Holland
,
NV
,
Heerenveen ,
The
Netherlands
U
C

П
1
Certificate of
the
Manufacturer /
Importer
We
hereby
certify
that the
2221 DIGITAL STORAGE OSCILLOSCOPE
AND ALL INSTALLED OPTIONS
complies
with
the RF
Interference
Suppression
requirements
of
Amtsbl
. - Víg
1046/1984
.
The
German
Postal
Service
was
notified
that
the
equipment is being
marketed
,
The
German
Postal
Service has the
right to re -
test the
series
and
to
verify that it
complies .
TEKTRONIX
Л
Л
П
П
Bescheinigung des Herstellers / Importeurs
Hiermit wird bescheinigt , daß der / die / das
2221 DIGITAL STORAGE OSCILLOSCOPE
AND ALL
INSTALLED
OPTIONS
in Übereinstimmung mit den Bestimmungen der Amtsblatt - Verfugung 1046/1984 funkentstört ist .
Der
Deutschen
Bundespost wurde
das
Inverkehrbringen
dieses
Gerätes
angezeigt und die
Berechtigung zur Überprufung der Serie auf Einhalten der Bestimmungen eingeräumt .
TEKTRONIX
NOTICE to
the
user
/
operator :
The German Postal Service requires that Systems assembled by the operator / user of this
instrument must also comply with Postal Regulation , Vfg . 1046/1984 , Par . 2 , Sect . 1 .
HINWEIS für den Benutzer / Betreiber :
Die vom
Betreiber zusammengestellte
Anlage ,
innerhalb derer dies
Gerät
eingesetzt wird , muß
ebenfalls
den
Voraussetzungen nach
Par . 2 , Ziff . 1
der Vfg .
1046/1984 genugen .
NOTICE to
the
user /
operator
:
П
n
П
П
Л
Л
П
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П
The
German
Postal
Service
requires
that
this
equipment , when
used in a
test setup ,
may only
operated if the requirements of Postal Regulation , Vfg . 1046/1984 , Par . 2 , Sect . 1.7.1 are complied
with
.
HINWEIS für den Benutzer / Betreiber :
Dies Gerät
darf in
Meßaufbauten nur
betrieben
werden
,
wenn die
Voraussetzungen des Par
. 2 ,
Ziff . 1.7.1
der Vfg .
1046/1984
eingehalten
werden
.

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2221
Operators
o
TABLE OF CONTENTS
Л
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7
7
П
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1
Page
Page
LIST OF ILLUSTRATIONS ..
LIST OF TABLES ....
OPERATORS SAFETY SUMMARY vii
Section 1 GENERAL INFORMATION
INTRODUCTION ......
SPECIFICATION .....
1-1
1-2
Л
Section 2 PREPARATION FOR USE
SAFETY
LINE VOLTAGE .............
POWER CORD ......
LINE FUSE
INSTRUMENT COOLING .............
START
- UP .
REPACKAGING ...
2-1
2-1
2.1
2-2
2-2
2-2
2-3
Section
3
CONTROLS ,
CONNECTORS
,
AND
INDICATORS
POWER AND
DISPLAY ...
VERTICAL ..........
HORIZONTAL .......
IIIIII ...
1
Л
Л
Section 6 BASIC APPLICATIONS
INTRODUCTION .....
6-1
OSCILLOSCOPE DISPLAYS ...........
6-1
NON STORE DISPLAYS ...
6-1
DIGITAL
STORAGE
DISPLAYS ...
6-2
MAKING
NONSTORAGE
MEASUREMENTS ........
6-4
AC PEAK - TO
- PEAK
VOLTAGE ...........
6-4
GROUND REFERENCED DC
VOLTAGE
............
6-5
ALGEBRAIC
ADDITION
...............
6-5
COMMON - MODE REJECTION ...
6-6
TIME
DURATION .... 6-7
AMPLITUDE
COMPARISON .
6-7
FREQUENCY ...
6-8
RISE
TIME
.............
6-8
TIME
DIFFERENCE
BETWEEN TWO
TIME -
RELATED
PULSES
............
6-9
TIME
DIFFERENCE
BETWEEN
REPETITIVE PULSES .....
6-10
PHASE
DIFFERENCE 6-10
TIME
COMPARISON
.
6-11
SLOPE
..............
6-12
TV LINE
SIGNAL
............. 6-13
TV FIELD SIGNAL ...........
6-13
MAKING
DIGITAL
STORAGE
MEASUREMENTS
.............
6-14
AC PEAK -
TO -
PEAK
VOLTAGE
USING
CURSORS
......
6-14
GROUND REFERENCED DC
VOLTAGE
............
6-14
TIME
DURATION ,
6-15
FREQUENCY
........
6-16
RISE
TIME
...........
6-16
WAVEFORM
COMPARISON
...
6-17
TIME
DIFFERENCE
BETWEEN
REPETITIVE PULSES ....
.......
6-18
TIME
DIFFERENCE
BETWEEN
TWO TIME -
RELATED PULSES .......... 6-18
PHASE DIFFERENCE BETWEEN
SINUSOIDAL SIGNALS .
6-19
SLOPE .... 6-20
LOW -
LEVEL SIGNAL
MEASUREMENTS
6-21
OBSERVING
AND
REMOVING
ALIASES IN STORE MODE
6-22
3-1
3-1
3-5
3-8
3-10
3-13
3-13
3-14
TRIGGER
............
STORAGE CONTROLS ...
REAR PANEL ...
SIDE PANEL .......
CRT READOUT .
Л 7
Section 4 OPERATING CONSIDERATIONS
GRATICULE
GROUNDING ...
SIGNAL
CONNECTIONS
INPUT - COUPLING
CAPACITOR
PRECHARGING
.............
PLOTTING THE GRATICULE
CANCELING A PLOT .......
4-1
4-1
4-1
4-2
4-2
4-2
5-1
O
Section 5 OPERATOR'S CHECKS AND
ADJUSTMENTS
INITIAL SETUP ..
TRACE
ROTATION
ADJUSTMENT ..
PROBE COMPENSATION .....
П
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5-1
5-2
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2221
Operators
TABLE
OF
CONTENTS (
cont )
Page
Page
Section 7 OPTIONS AND ACCESSORIES
STRUCTURE ....
A - 1
TEST EQUIPMENT REQUIRED
A - 1
LIMITS AND TOLERANCES ..........
A - 1
PREPARATION FOR CHECKS ........... A - 1
INDEX TO PERFORMANCE
CHECK STEPS ...........
A - 3
VERTICAL ...
A
-
4
INITIAL CONTROL SETTINGS .....
A - 4
PROCEDURE
STEPS ........
A - 4
HORIZONTAL
...........
A - 11
INITIAL CONTROL SETTINGS ............ A - 11
PROCEDURE STEPS ........
A - 11
TRIGGER
...............
A - 15
INITIAL CONTROL SETTINGS ,
A - 15
PROCEDURE STEPS ...........
A - 15
EXTERNAL Z - AXIS , PROBE
ADJUST , EXTERNAL CLOCK ,
AND X - Y PLOTTER ...............
....
A.18
INITIAL CONTROL SETTINGS ........... A - 18
PROCEDURE STEPS ........
A - 18
Oo..Oooida
INTRODUCTION
7-1
GENERAL INFORMATION ............
7-1
STANDARD ACCESSORIES .........
7.1
OPTIONAL ACCESSORIES ...........
7-1
INTERNATIONAL POWER CORD
OPTIONS ........
7.2
OPTION 10
7-2
OPTION 12
7-2
OPTION 33 ......
7-2
COMMUNICATIONS OPTION
OPERATION .... 7-2
ADVANCED FUNCTION MENU
( for the
2230 only )
...
7-3
NON -
VOLATILE
EXTENDED
MEMORY
(
for the
2230
only
)
......
7-3
OPTION
10
GPIB
OPERATORS
INFORMATION
.................
7-3
OPTION 12 RS - 232 - C OPERATORS
INFORMATION
...............
7-10
RS - 232 - C PROGRAMMING ................. 7-15
COMMUNICATION AND
WAVEFORM
TRANSFER ................
7-17
READOUT / MESSAGE COMMAND
CHARACTER SET ...........
7-17
MESSAGES AND
COMMUNICATION
PROTOCOL .........
7-17
WAVEFORM TRANSFERS ...............
7-21
COMMUNICATION COMMANDS ........ 7-24
STATUS BYTES AND EVENT
CODES
.....
7-47
2221 SPECIFIC COMMANDS ............. 7-51
.......
CU
Appendix
B
RS - 232 - C DEVICE
INTERCONNECTION
B - 1
INTRODUCTION ................
B -
1
DETERMINING DEVICE TYPE ..........
B - 1
INTERCONNECTION RULES ........
B - 2
INTERCONNECTION CABLE TYPE
IDENTIFICATION
.............
B - 3
RS - 232 - C INTERCONNECTION
CABLE - TYPE ILLUSTRATIONS .......... B - 3
INTERCONNECTION CABLE
PART NUMBERS .........
B - 7
PRINTER / PLOTTER OPERATION
B - 10
PLOTTER
TYPES
.....
B - 10
QUESTIONS AND ANSWERS
B - 17
11
Appendix A
PERFORMANCE
CHECK PROCEDURE
INTRODUCTION
A - 1
PURPOSE
..........
A - 1
PERFORMANCE CHECK INTERVAL .. A - 1
CHANGE INFORMATION
1
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2221
Operators
o
LIST OF ILLUSTRATIONS
Figure
Page
The
2221 Digital
Storage
Oscilloscope
1-1
Maximum input voltage vs frequency derating curve for CH 1 OR X ,
CH 2 OR
Y , and
EXT
INPUT connectors
....
Physical dimensions of the 2221 Oscilloscope .
1-14
1-15
1-2
.....
Л
П
1
П
П
1
7
Л
Л
in
П
Л
7
П
2-1
2-2
2-3
Securing the detachable power cord to the instrument ..
Optional power - cord data
..........
Fuse hoider and
detachable power - cord
connector
.
2-1
2-2
2-2
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
3-9
Power and display controls and power - on indicator
Vertical
controls
and
connectors
Horizontal
controls
.....
Trigger controls
,
connector
, and
indicator
........
Storage
controls
.........
Rear
panel
Left
side
panel
....
X -
Y
Plotter
interfacing
Crt
readout
display
......
3-2
3-3
3-6
3-8
3-11
3-13
3-14
3-15
3.16
Graticule
measurement
markings
4-1
5-1
Probe
compensation
......
5-2
6-1
6-2
6-3
6-4
6-5
6-6
6-7
6-8
6-9
6-10
6-11
6-12
6-13
6-14
6-15
6-16
6-17
6-18
6-19
6-20
Peak - to -
peak
waveform
voltage
.....
Ground
referenced
voltage
measurement
Algebraic
addition
.....
Common -
mode
rejection
Time duration ...........
Rise time ......
Time
difference
between two time -
related
pulses
Time
difference
between
repetitive
pulses
........
Phase difference .
High -
resolution
phase
difference .
Slope
......
Ac peak - to - peak
voltage , cursor
method ........
Ground
referenced
dc voltage
, cursor
method
.
Time duration , cursor method ..
Rise - time
setup , five -
division display .
Rise
time ,
cursor
method
.........
Waveform
comparison
Time
difference
between
repetitive pulses
........
Time
difference
between two time -
related
pulses
Phase
difference
between
sinusoidal
signals ...
6-4
6-5
6-6
6-7
6-7
6-9
6-10
6-10
6-11
6-11
6-12
6-14
6-15
6-16
6-16
6-17
6-18
6-18
6-19
6-20
1
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2221
Operators
LIST
OF
ILLUSTRATIONS
(
cont )
บ
Figure
Page
6-21
6-22
6-23
6-24
6-25
6-26
Slope using cursors .....
Low - level
signal ,
STORE
mode
Low - level signal
, AVERAGE
mode
Anti
-
aliasing
Glitch
display
,
ACCPEAK
Store
mode .....
Missing pulse , ACCPEAK Store mode ........
6-21
6-21
6-22
6-22
6-23
6-23
7-1
7-2
7-3
Option 10 side panel ....
SRQ ,
ADDR , and
PLOT indicators .
Option
12
side panel
7-5
7-7
7-11
10.III
I
..........
00.OON
+4241
بال
B - 1
B - 2
B - 3
B - 4
B - 5
B - 6
B - 7
B - 8
B
-
9
B - 10
B - 11
B - 12
B -
13
B - 14
B -
15
B - 16
B - 17
B - 18
Null
Modem
cable
wiring ...
B - 2
Type A
Connections -
DTE male
to DCE
female ........
B - 4
Type A1 Connections — DTE female to DCE female ..
B - 5
Type A2
Connections —
DTE male to
DCE male
.....
B - 6
Type B
Connections - DTE male
to DTE male
and DCE male
to DCE male ....
B - 7
Type B1
Connections — DTE female
to DTE male
and DCE female
to DCE male
B - 8
Type B2 Connections — DTE female to DTE female and DCE female to DCE female .............
B - 9
Option 12 RS - 232 - C Printer / Plotter interconnects .......
B - 11
Option 12 RS - 232 - C communication parameters
B - 11
HP 7470A and HP 7475A plotter RS - 232 - C switch settings ...
B - 12
Option 12 PARAMETERS switch settings for HP - GL compatible plotters
B -
12
Epson FX - Series printer RS - 232 - C switch settings ...
B - 13
Option 12 PARAMETERS switch settings for Epson printers ..
B -
13
HP
ThinkJet RS - 232 - C
switch
settings
.....
B - 14
Option 12 PARAMETERS switch settings for HP Thinkjet printer .....
B - 14
Option 10 GPIB interface PARAMETERS switch .........
B - 15
Option 10 PARAMETERS switch settings for compatible GPIB printers / plotters
B - 15
Switch settings for compatible GPIB plotters ....
B - 16
Qoca.O.O.O
1
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2221
Operators
Л
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LIST
OF
TABLES
Table
Page
III.I
1.1
1-2
1-3
1-4
Displayable Record Length
Electrical
Characteristics ......
Environmental
Characteristics
Physical
Characteristics
1-1
1-3
1-13
1-14
3-1
3-2
3-3
3-4
3-5
Probe
Coding
.....
2221 Digital Storage Modes
Repetitive Store
Sampling Data
Acquisition
..
Acquisitions Before a Plot ...
Auxiliary
Connector
....
3-4
3-7
3-7
3-12
3-13
П
П
Л
Л
on
П
1
7-1
7-2
7-3
7-4
7-5
7-6
7-7
7-8
7-9
7-10
7-11
7-12
7-13
7-14
7-15
7-16
7.17
7-18
7.19
7-20
7-24
7-22
7-23
7-24
7-25
7-26
7-27
7-28
7-29
7-30
7-31
7-32
Extended Memory
Specification
Functions
Subsets
Implemented ....
Specific
Format
Choices
Implementation of Specific Features
GPIB
Connector
........
GPIB
PARAMETERS Switch
..................
Specific Format
Choices
for
Option 12
Implementation of Specific Features for Option 12 ........
RS - 232 - C
DTE
Connector
RS
-
232
- C
DCE
Connector .
RS - 232 - C
PARAMETERS
Switch
Baud Rate
Parity
Selection
.......
Readout / MESsage Command Character Set
ASCII
Code
Chart
............
Numeric Argument Format for Commands
Typical 8 - Bit Binary - Encoded Waveform Data
Typical 16 - Bit Binary - Encoded Waveform Data
Typical 8 - bit Hexadecimal - Encoded Waveform Data
Typical 16 - bit Hexadecimal - Encoded Waveform Data ........
Typical ASCII - Encoded Waveform Data ..........
Vertical
Commands ......
Horizontal Commands ....
Trigger
Commands
.....
Cursors
Commands
Display
Commands
Acquisition Commands .................
Save and Recall Reference Commands
Waveform
Commands
.........
Waveform
Preamble Fields
Miscellaneous Commands
Service Request Group Commands
7-4
7-4
7-5
7-5
7-6
7-6
7-10
7-11
7-11
7-12
7-13
7-13
7-14
7-18
7-19
7-21
7-22
7-23
7-23
7-24
7-24
7-26
7-27
7-28
7-29
7-31
7-32
7-34
7-38
7-40
7-44
7-45
П
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2221
Operators
C
LIST
OF
TABLES (
cont
)
Table
Page
...............
..... 7-33
7-34
7-35
7-36
RS - 232 - C Specific Commands .
Status
Event and
Error
Categories
Event Codes .....
2221 Commands , Short Form List
7-46
7-47
7-48
7-51
A - 1
A - 2
A -
3
A - 4
A - 5
A - 6
Test Equipment Required .......
Deflection
Accuracy
Limits
...
Storage Deflection Accuracy ...
Settings
for
Bandwidth
Checks
Settings
for
Timing Accuracy
Checks
Switch Combinations for Triggering Checks ....
A -
2
A -
4
A - 5
A - 7
A.12
A - 15
U .
B - 1
B -
2
Cable - Type
identification
..
RS - 232 - C Transfer Rates
B
-
3
B - 17 .....
بال
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2221
Operators
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7
П
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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 and do not
appear
in
this
summary
Terms in
This
Manual
Grounding
the
Product
CAUTION
statements
identify
conditions or
practices that
could
result
in
damage to the
equipment or
other
property .
П
П
WARNING
statements
identify
conditions or
practices that
could result
in
personal injury or
loss of life .
This product is grounded through the grounding conductor
of the power cord . To avoid electrical shock , plug the
power
cord
into
properly wired
receptacle
before
making
any connections to the product input or output terminals .
A
protective
ground
connection
by
way of the
grounding
conductor
in
the power
cord is
essential for safe
operation
.
Terms
as
Marked
on
Equipment
CAUTION
indicates
a
personal injury
hazard not
immedi
ately accessible as one reads the markings , or a hazard to
property ,
including the
equipment
itself .
Danger
Arising from
Loss of
Ground
Upon loss of the protective - ground connection , all accessi
ble conductive parts ( including knobs and controls that
may
appear to be
insulated ) can
render an
electric shock
.
DANGER
indicates a
personal
injury hazard
immediately
accessible as
one
reads
the
marking .
Symbols
in This
Manual
Use the Proper Power Cord
Use only the power cord and connector specified for your
product
.
П
П
П
П
Л
П
Л
А
This
symbol indicates
where
applicable cau
tionary or other information is to be found . For
maximum input
voltage see Table 1-2 .
Use only a power
cord that is
in good
condition .
Symbols as Marked on Equipment
For
detailed
information on
power
cords and
connectors ,
see
Figure
2-2 .
4
DANGER
High
voltage .
Use the Proper Fuse
To avoid fire
hazard , use only
a fuse of the
correct type ,
voltage rating and current rating as specified in the parts
list for
your
product .
D
Protective ground ( earth ) terminal .
A
ATTENTION Refer to manual .
Do Not Operate in Explosive Atmospheres
To avoid explosion , do not operate this instrument in an
explosive atmosphere .
Power
Source
Do Not Remove Covers or Panels
This
product
is
intended to
operate from a
power
source
that does 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 .
To avoid
personal
injury ,
do not
remove
the
product cov
ers or panels . Do not operate the instrument without the
covers and panels properly installed .
Л
п
月
Л
C
vii

2221
Operators
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The 2221
Digital
Storage
Oscilloscope
. .
viii

Section
1-2221
Operators
o
GENERAL INFORMATION
п
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1
INTRODUCTION
The
TEKTRONIX
2221
Digital
Storage
Oscilloscope is a
60 MHz
bandwidth
,
dual -
channel ,
portable
oscilloscope . It
has both
real - time
analog display
(
NON -
STORE ) and
digi
tal sampling and display capabilities ( STORE ) . The 2221 is
a
rugged
,
lightweight
instrument
featuring
microprocessor
operation , on - screen readout of the front - panel control set
tings and measurement results , and on - screen measure
ment cursors and trigger - point indicator .
The
acquired
waveform record length is 4
K
samples
( 4096 data points ) for a single applied waveform . For
dual - channel storage , the record length of each waveform
( in either
CHOP or ALT
Vertical Mode )
is 2 K
samples
( 2048 data points ) . The normal waveform display window
is 1 K ( 1024 data points ) in length . One waveform set of
4K record length may be stored in the SAVE REF
memory .
The
acquired
waveforms and
the
SAVE REF
waveforms may be
displayed at the
same time for
making
comparisons .
The vertical system provides calibrated deflection fac
tors from 2 mV per division to 5 V per division . The hor
izontal
system
provides calibrated
sweep
speeds from
50 ns per division to 0.5 s per division in both STORE and
NON -
STORE
.
Three
slower
sweep
speeds
of 1
s , 2 s ,
and
5 s per
division
are
available
for
STORE mode
operation
.
A X10
magnifier
increases all
the
display
sweep
speeds by
a
factor of ten
and
increases the
maximum
sweep
speed
to 5 ns
per
division
.
The
CURSORS
position control lets the
user place the
1 K display window anywhere within a 4 K record . A bar
graph is displayed on screen to tell the user where the
window is located in the record . There is also a DISPLAY
COMPRESS feature that
lets the user
reduce the
waveform
record
to 1
K in length
so that the
complete
acquired record may be displayed in one screen . The effect
of the
DISPLAY
COMPRESS and
the
X10
magnification
features on
horizontal SEC
/ DIV , the
number of
displayable
screens , and the acquisition record length is shown in
Table 1-1 .
П
D
The
STORE
mode
maximum
digital
-
sampling
rate is 20
megasamples per
second
.
The
digitizing
system can
cap
ture
waveform
glitches
(
unwanted brief
surges or false
sig
nals ) that have pulse widths of at least 100 ns . There is a
SAVE
mode that
stops the
waveform
acquisition in
pro
gress and freezes the display . This SAVE feature prevents
the display
from being
updated by further
acquisitions to
let the user
store or examine a
waveform
of
interest .
The on - screen measurement cursors may be used to
make voltage and time difference measurements on either
the STORE mode waveforms being acquired or the stored
SAVE REF
waveforms
.
When both CH 1
and CH 2 are
being displayed , the measurement cursors are present on
both channel traces . Voltage difference ( delta V ) and either
the time difference ( deita T ) or the reciprocal of the time
difference
( 1 /
delta T )
between
the
displayed cursors are
displayed
in the crt
readout
.
Table
1-1
Displayable Record Length
Effective
SEC
/
DIV
Displayable
Screens
Active
Controls
Display Window ( = )
Additional Displayable Windows ( - )
n
40
screens
X10
10
screens X 10 and
UNCAL
( SEC / DIV ) -10
(
SEC
/
DIVX4-10
SEC / DIV
( SEC / DIV ) x4
4
screens
1
screen
UNCAL
ܚܝܕ
o
1-1

u
General
Information -
2221 Operators
The instrument is shipped with the following standard
accessories :
SPECIFICATION
1
1
2
The following electrical characteristics ( Table 1-2 ) are
valid when the instrument has been adjusted at an
ambient temperature between + 20 ° C and + 30 ° C , has
had a
warm - up
period of
at least
20
minutes , and
is
operating
at an
ambient
temperature
between
° C and
+ 50 ° C ( unless otherwise noted ) .
1
1
Operators
Manual
Users
Reference Card
Probe
Packages
Accessory
Pouch
Front Panel Cover
Power Cord
Fuse
DB - 9 Male Connector and Connector Shell
Loop
Clamp
Flat Washer
Self -
Tapping
Screw
U
U
1
1
1
Items listed in the " Performance Requirements " column
are verifiable qualitative or quantitative limits that define
the measurement capabilities of the instrument .
1
1
1
Environmental characteristics are given in Table 1-3 .
This instrument meets the requirements of MIL - T - 288000
for Type III , Class 5 equipment , except where noted other
wise ,
For part numbers and further information about both
standard and optional accessories , refer to " Options and
Accessories " ( Section 7 ) of this manual . Your Tektronix
representative
, local
Tektronix
Field
Office , or
Tektronix
products
catalog
can also
provide
additional
accessories
information .
U
Physical
characteristics of the
instrument are
listed in
Table 1-4 .
رال
U
u
u
1-2

n
П
General
Information -
2221
Operators
o
Table
1-2
Electrical
Characteristics
Characteristics
Performance
Requirements
VERTICAL DEFLECTION SYSTEM
П
П
Deflection Factor
Range
2 mV per
division to 5 V
per
division in a 1-2-5
sequence of 11
steps .
DC
Accuracy (
NON
-
STORE
)
+ 15 ° C to + 35 ° C
Within + 2 % .
° C to + 50
° C
Within + 3 %
, a
For 5 mV per division to 5 V per division , the gain is set with the
VOLTS
/
DIV
switch at 10
mV per
division
.
2 mV per division gain is set with the VOLTS / DIV switch at 2 mV
per
division .
On
Screen
DC
Accuracy (
STORE )
+ 15 ° C to + 35 ° C
Within + 2 % .
П
° C to + 50 ° C
Within
+
3 %
.a
Storage
Acquisition
Vertical
Resolution
Gain set with VOLTS / DIV set to 5 mV per division .
8 - bits , 25
levels per
division
. 10.24
divisions
dynamic range.a
Continuously variable between settings . Increases deflection fac
tor by at
least
2.5
to 1 .
Range of VOLTS / DIV Variable Control
Step Response ( NON - STORE Mode )
Rise Time
° C to + 35 ° C
5 mV per division
to
5 V
per
division
2 mV per division
5.8 ns or less.a
7.0
ns
or
less.a
+ 35 ° C to + 50 ° C
5 mV per division to
5 V
per
division
7.0
ns
or
less.a
2 mV per division
7.0 ns or less.a
Rise time is calculated from the formula :
0.35
Rise Time
Bandwidth (
-3
dB
)
Step Response ( STORE Mode )
Useful Storage Rise Time
SAMPLE
Single
Trace
SEC / DIV X 1.6
CHOP / ALT
SEC / DIV X 1.6
sa
sa
n
П
n
П
П
100 50
PEAK
DETECT or
ACCPEAK
SEC / DIV X 1.6
SEC / DIV X 1.6
sa
50
sa
25
Rise
time
is
limited
to
5.8 ns
minimum with
derating
over
tempera
ture ( see NON - STORE Rise Time ) .
aperformance Requirement not checked in manual .
1-3

General
Information -
2221 Operators
Table
1-2 (
cont )
Characteristics Performance
Requirements
Aberrations ( NON - STORE and
STORE in
SAMPLE
Mode
)
2 mV per division to
50 mV per division
+ 4 % ,
-4 % ,
4 % p -
p .
3 % or less at 25 ° C with cabinet installed .
0.1 V per
division to
0.5 V per division
+ 6
%
,
-6
%
,
6
% p -
p .
5 % or less at 25 ° C with cabinet installed .
1 V per
division to
5 V
per division
+ 12 % , -12 % , 12 % p - p.a
10 % or less at 25 ° C with cabinet installed .
Measured with a five - division reference signal , with the top of the
square wave centered vertically , from a 50 - ohm source driving a
50 - ohm coaxial cable terminated in 50 ohms at the input connec
tor , and VOLTS / DIV Variable control in the CAL detent .
NON
-
STORE
Bandwidth
(
-3 dB )
° C to + 35 ° C
5 mV per division
to
5 V
per
division
Dc to at least 60 MHz .
2 mV per division
Dc to at least 50 MHZ .
+ 35 ° C to + 50 ° C
5 mV per division to
5 V
per
division
Dc to at least
50 MHz . a
2 mV per
division
UU
Dc to at least
50 MHz.a
Measured with a six - division reference signal , centered vertically ,
from
50 - ohm source driving a 50 - ohm coaxial cable terminated
in 50 ohms
at the input
connector
and
the probe
input , and
VOLTS / DIV Variable control in the CAL detent .
NON
-
STORE
BW
LIMIT (
-3
dB )
10 MHz + 15 % .
AC
Coupled
Lower
Cutoff Frequency
10 Hz or less at -3 dB.a
Useful Storage Performance
RECORD , SCAN , and ROLL Store Modes
SAMPLE Acquisition , no AVERAGE
Single
Trace
CHOP / ALT
5 us / div to 5 s / div
10
Hza
SEC
/
DIV
5
Hza
SEC / DIV
EXT
CLOCK ( up
to 1
kHz
)
EXT
Hza
10
EXT
Hza
20
Useful storage performance is limited to the frequency where
there are ten samples per sine - wave signal period at the max
imum sampling rate . This yields a maximum amplitude uncer
tainty of 5 % . Max sampling rate is 20 MHz in Single trace and 10
MHz in
CHOP or ALT
at a SEC /
DIV
setting
of
5 us per
division
.
Accuracy at useful storage performance limit is measured with
respect to a six - division 50 kHz reference sine wave .
u
*
pertormance
Requirement not
checked
in
manual .
1-4

П
П
General
Information -
2221
Operators
Table
1-2 (
cont )
O
Characteristics
Performance
Requirements
Useful
Storage Performance (
cont )
PEAK
DETECT
Sine -
Wave
Amplitude
Capture
( 5 % p
- p
maximum
amplitude
uncertainty
)
CHOP
Single
Trace and
ALT
1
MHza
1 MHza
Pulse
Width
Amplitude
Capture
( 50 %
p - p
maximum
amplitude
uncertainty )
100 ns
SEC /
DIV
50
REPETITIVE Store
Mode
ALT
Single
Trace
60
MHz (
-3 dB )
0.05 us per division
60 MHz ( -3 dB
)
П
П
П
D
П
П
0.1 us
per
division
60
MHz ( -3
dB ) a
b
50
MHz ( -3 dB )
0.2 us per
division to
2
us
per
division
( 5 %
maximum
amplitude
uncertainty )
10
Hza
SEC
/
DIV
5
Hza
SEC
/
DIV
AVERAGE
Mode
Weight of Last Acquisition
AVERAGE
Mode
weight is 1 /
16.a
NON -
STORE CHOP
Mode
Switching Rate
500 kHz + 30 % , a
STORE
Chop
Rate
10 us per
division
50 / ( SEC / DIV ) .
25 / ( SEC / DIV ) .
a
5 s per
division
to
and
including
20
us
per
division
NO CHOP Mode ; acts as in ALT.a
5 us per division through
0.05 us per division
A / D
Converter
Linearity
Monotonic with no missing codes.a
STORE Mode Cross Talk
Less than 2 % .
1
П
П
Measured
in
CHOP at 10
us per
division
and 10
mV per
division
using a 100
kHz square
wave signal
vertically centered and th
other
channel input
coupling set to GND .
& Performance Requirement not checked in manual .
bSixty MHz
bandwidth
is derated
for
temperature outside ° C to + 35
° C and at 2 mV
per division as for
NON - STORE .
П
C
П
П
1-5

General
Intormation -
2221
Operators
Table
1-2 (
cont )
Characteristics
Pertormance
Requirements
At least 10 to
1 at 50 MHz
.
NON - STORE Common - mode Rejection Ratio
( CMRR )
Checked at 10 mV per division for common - mode signals of six
divisions or less with VOLTS / DIV Variable control adjusted for
best CMRR at 50 kHz .
Input
Current
1 nA or less ( 0.5 division or less trace shift when switching
between DC and
GND input
coupling
with
the VOLTS / DIV
switch
at 2
mV
per
division.a
Input
Characteristics
Resistance
1
MS + 2 %
, a
Capacitance
20 pF 2
pF.a
Maximum
Safe
Input
Voltage
( CH 1 and
CH 2 )
DC
and
AC
Coupled
A
See Figure 1-1 for maximum input voltage vs. frequency derating
curve ,
400 V ( dc + peak ac ) or 800 V ac p - p at 10 kHz or less.a
NON - STORE Channel Isolation
Greater than 100 to 1 at 50 MHZ .
STORE Channel Isolation
100 to 1 at 50 MHZ .
POSITION
Control
Range
At least 11
divisions
from
graticule center .
Trace Shift with VOLTS / DIV Switch Rotation
0.75 division or less ; VOLTS / DIV Variable control in the CAL
detent.a
1 division or less
, a
Trace Shift as the VOLTS / DIV Variable Control is
Rotated
با
)
Trace Shift with INVERT
1.5 division or less.a
aperformance Requirement not checked in manual .
บ
1-6

General
Information -
2221
Operators
Table
1-2 (
cont
)
O
Characteristics
Performance
Requirements
TRIGGERING
SYSTEM
П
П
П
M
П
1
П
П
TRIGGER
Sensitivity
P - P
AUTO
and
NORM
Internal
External
10 MHZ 60 MHZ
0.35 div
1.0 div
40
mV 120 mV
External
trigger
signal
from
a
50 -
ohm
source
driving a 50 -
ohm
coaxial
cable
terminated
in
50
ohms
at
the
input connector
.
Reduces
trigger
signal
amplitude at high
frequencies by
about
20 dB with
rolloff
beginning at 40
kHz + 15 kHz .
Should not
trigger with
a 1 -
division
peak
- to -
peak
250
kHz
signal
when HF
REJ is ON .
HF
REJ
Coupling
P - P
AUTO
Lowest
Useable
Frequency
20 Hz with 1 division internal or 100 mV external.a
TV
LINE
Internal
0.35 div.a
External
2
35
mV
p -
p .
> 1 division of composite sync , a
TV FIELD
EXT INPUT
Maximum
Input
Voltage
A
400 V ( dc + peak ac ) or 800 V ac p - p at 10 kHz or less.a
See
Figure
1-1
for
maximum
input
voltage vs
frequency
derating
curve ,
1 M2
+ 2 % .a
20 pF 2.5 pF.a
Input
Resistance
Input
Capacitance
AC
Coupled
Lower
Cutoff
Frequency
LEVEL
Control
Range
TRIGGER (
NORM )
INT
10 Hz or less at -3 dB a
П
п
П
П
П
1
EXT ,
DC
EXT , DC - 10
VAR
HOLDOFF Control
(
NON
STORE )
May be set to any voltage level of the trace that can be displayed.a
At
least
+1.6 V ,
3.2
V
p - p .
At least +16 V , 32 V p - p.a
Increases Sweep holdoff time by at least a factor of 10.a
See "
VAR
HOLDOFF
Control
" in
Section
3
, "
Controls ,
Connec
tors , and Indicators " for effect in STORE Mode ,
Acquisition Window Trigger Point
Pretrigger
Seven - eighths of the waveform acquisition window is prior to the
trigger.a
Posttrigger
One - eighth
of the
waveform
acquisition
window
is
prior to the
trigger .
One - half
of the
waveform
acquisition
window is prior to
the
trigger.a
Midtrigger
& Performance Requirement not checked in manual .
C
П
П
1-7

General
Information - 2221
Operators
Table 1-2 ( cont )
1
Characteristics
Performance Requirements
HORIZONTAL DEFLECTION SYSTEM
NON - STORE Sweep Rates
Calibrated
Range
Sweep
STORE
Mode
Ranges
NON -
STORE
Accuracy
+ 15 ° C to + 35 ° C
° C to + 50 ° C
0.5 s per division
to 0.05 us per
division in a
1-2-5
sequence of 22
steps . The X10 magnifier extends maximum sweep speed to 5 ns
per division . The
4K COMPRESS
multiplies
the
SEC / DIV by 4 .
See Table 3-2 for Modes and Ranges and Default Acquisition
Modes.a
Unmagnified
Magnified
Within 2 % Within + 3 %
Within
+ 3 % a
Within
+
4
% a
Sweep
accuracy
applies
over the
center
eight
divisions .
Exclude
the first 40 ns of the sweep for magnified sweep speed and any
thing
beyond the
100th
magnified
division .
+ 5 %
.
Linearity
measured over
any two of
the center
eight
divisions .
Exclude the first 25 ns and anything past the 100th division of the
X10
magnified
sweeps
.
Single
Trace
CHOP /
ALT
20 MHza
10
MHza
NON -
STORE
Sweep
Linearity
10
MHza
5
MHza
UU
10
MHz
10
MHz
Digital
Sample
Rate
5
us
per
division
( CHOP becomes ALT )
10 us
per
division
20 us per division to 5s per
division ( 50 % duty factor on
each
channel in
CHOP )
REPETITIVE STORE
0.05 us per division to
1
us
per
division
2
us
per
division
External Clock
Input Frequency
Digital
Sample
Rate
20
MHza
20
MHza
10
MHza
10
MHza
Up
to 1
kHz
.
니
10
MHz.a
Store Rate
Duty
Cycle
One peak detected data pair for every second falling edge.a
10 % or greater ( 100 us minimum hold time ) . a
TTL Compatible .
Ext Clock Logic Thresholds
Maximum Sate
Input Voltage A
25 V
( dc +
peak
ac ) or
25 V
p - p ac
at 1
kHz
or
less.a
Input
Resistance
>
20
k.22.a
aperformance
Requirement
not checked
in
manual
.
C
1-8