Tektronix 2221 User Manual

Section
1-2221
Operators
o
GENERAL INFORMATION
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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 .
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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
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1-1

Tektronix 2221 Specifications

General

Brand	Tektronix
Model	2221
Category	Test Equipment
Language	English