Tektronix 2221 User Manual

П
П
Controls
,
Connectors , and
Indicators - 2221
Operators
O
while in
SAVE ,
the
readout
will be
updated
to
indicate
the
new
acquisition
mode ,
but the
readout
will
be
tilted to
indicate
that
the
presently
acquired
waveform
and the
readout
do
not match ,
The
present
acquisition mode is
displayed
in
the
crt
readout at
lower
center
.
SAVE /
CONT
Switch
-
Stops
the
current
acquisi
tion
and display
update
in
progress
when
pressed
in . If
the
SEC
/
DIV
switch
setting is
0.7 s
per divi
sion or
slower
, the
SAVE
state
is
entered
immedi
ately upon pressing the button . At SEC / DIV
settings of 50 ms per division and faster , if an
acquisition has
been
triggered
,
the
acquisition is
allowed
to
complete
before the
SAVE state is
entered .
Pressing
the
SAVE / CONT
switch a
second
time
restarts (
continues
) the
acquisition
process . The SAVE state is indicated by the
word
"
SAVE
"
on the
second line
of
readout in
the upper right - hand portion of the crt .
П
П
VECTORS
ON
/ OFF Control .
Provides
a
choice
of
either dots or
vector
-
connected
points
in the
display of acquired waveforms for STORE mode
SEC
/
DIV
switch
settings
from 5 s
per
division to
5 us
per
division ,
except
X - Y mode . The
change occurs on new acquisitions after the
button is
pushed .
The
pretrigger
portion of
an
untriggered
acquisi
tion
stops
filling
in
SAVE
mode .
Upon
leaving
SAVE , a
new
acquisition
is
started ,
and a
trigger
will
not
be
accepted
until
the
pretrigger
portion
again
refills
.
35 )
CURSORS
Controls
—
These
controls
apply
to
all
displayed STORE mode waveforms . Delta Volts ,
Delta
Time
, and
One
Over Delta
Time
measurements
of the
STORE displays are
made using the
CUR
SORS
controls .
CURSORS controls
are
used to
position the
display
window .
See the
" CRT
READOUT "
description for
the
cursor
readout
display
.
П
TRIG
POS
Switch -
Positions
the trigger
point
for
acquisitions
either near the
end (
pretrigger
) , the
beginning (
posttrigger ) , or
the
middle (
midtrigger )
of
the
waveform
.
A
T is
displayed on
the
waveform
and
bar
graph to
indicate
the
trigger
point
.
Pressing the
TRIG
POS
button
causes a
change
in
trigger
position
on
the next
acquisition
.
Successive
presses
of
the TRIG
POS button will
cause
the
trigger
position to
rotate
through
three
possible
settings
(
posttrigger
,
midtrigger
,
and
pre
trigger
) .
The
change
in
trigger
point
will
be
seen
on new
acquisitions
.
The T on
the bar
graph
will
be
moved ( and
tilted
if the
instrument is in
SAVE
)
to
indicate the
trigger
position for the
next
acquisition .
SELECT
WAVEFORM
Control -
Toggles
between
the
reference
waveform and
the
acquisition for
the purpose of making cursor measurements . If
there
is
no
reference
waveform
,
this
button
is
inactive .
Waveform
selection
is
indicated on
the
second line of the
crt
readout by an
underline that
moves
between
A (
acquistion
)
and SREF (
refer
ence ) when the
SELECT
WAVEFORM
button
is
pressed .
When an
acquisition
control is
changed ,
the
cursors return to
the
acquisition
waveform
set .
Cursors
also
move to
the
acquisition
waveform set if
the
reference
waveform set is
turned off .
MODE
Switch --
Selects
the
acquisition
modes for
any
appropriate sweep speed
range ( see Table
3-2 ) .
Pressing this
button will
cause
the
acquisi
tion to
reset .
The
new mode
will
apply
to
the
new
acquisition . If the
MODE
switch is
pressed
37
36
35
34
33
n
o
П
П
п
PLOT
REFERENCE
AUTO
MANUAL DISPLAY SAVE REF AT /
IAT
- CURSORS
SELECT
ACQUISITION
SAVE /
WAVEFORM
VECTORS MODE TRIG
POS CONT
SELECT
C1 / C2
STORE
-
ON / OFF
ON / OFF
NON - STORE 1
6530-35
o
Figure 3-5 . Storage controls .
3-11

Tektronix 2221 Specifications

General

Brand	Tektronix
Model	2221
Category	Test Equipment
Language	English