Tektronix 2221 User Manual

Basic
Applications - 2221
Operators
NOTE
AV1F80.0
%
A1 = 1 01. Obnis
Pulses
with
fast
rise times
have
only a
few
sample
points
on
the
leading edge ,
and it may
not be
possible to place the cursor at exactly the 10 % ,
80 % ,
90 %
, or
100
%
points .
100
90
Л
П
П
П
П
П
CURSOR
AT 90 % GRATICULE
5.
Use the
CURSORS control to
move the
active cur
sor to the
minimum
level
of the
waveform
.
ACTIVE
CURSOR
AT 10 % GRATICULE
6.
Push the
SELECT
C1
/ C2
button
to
select
the
other
cursor , and use the CURSORS control to move the active
cursor to the maximum level of the waveform ,
10
%
2V
SAMPLE
5ns
7. Set the
VOLTS
/
DIV
switch and the
VOLTS
/ DIV
Variable
control
(
or
signal
amplitude
)
for a AV
readout of
100
%
.
4998-18
Figure 6-16 . Rise time , cursor method .
NOTE
П
П
The
SAVE
ACQUISITION
mode
button
may be
pressed
in
at this time
to save
the
acquired
waveform for
as
long
as
desired
.
Voltage
and
time
measurements may be made on the SAVE waveform
with
less
trigger
jitter
.
3.
Select
a
VOLTS /
DIV
switch
setting
that
gives the
desired vertical deflection .
4. Set
the
SEC / DIV
switch
to
display the
reference
sig
nal
with the
desired
sweep
rate
.
8.
Use
the
CURSORS
control to
move
the
active
cur
sor
down the
waveform's
leading
edge
until the
AV
readout is 90 % .
5. Push the
SAVE REF
button .
3
П
9.
Push the
SELECT C1 / C2
button to
select
the
other
cursor , and use the CURSORS control to move the active
cursor
up
the
waveform's
leading
edge
until the AV
readout is
80
%
(
see
Figure
6-16 ) .
6.
Acquire the
waveform
that
is to be
compared with
the
reference
waveform
.
NOTE
10. Read the
puise rise time
from the crt
delta time
readout
.
WAVEFORM COMPARISON
A stored
reference
will
remain
displayed until the
DISPLAY ON / OFF
button
is
pushed
.
Switching the
instrument
to
NON - STORE removes stored
waveforms from the display , but the saved reference
waveforms
remain in the
digital
storage
memory for
use upon return to a storage mode . A new reference
waveform is saved when the SAVE REF button is
pushed
.
Repeated
comparisons of
newly acquired
signals with a
reference
signal for
amplitude ,
timing
, or
pulse
-
shaped
analysis may be easily
and
accurately made
using the
SAVE REF
function of the
instrument .
1. Preset
instrument
controls
and obtain a
baseline
trace .
11
1
1
П
П
П
7. Use
the
selected
channel's
Vertical
POSITION
con
trol to overlay the newly acquired waveform on the refer
ence
waveform for
making the
comparison
( see
Figure
6-17 ) .
The
vertical
deflection and
sweep rate
remain cali
brated to
allow direct
measurement
from the
graticule
,
or
cursors may be used to determine voltage or time
differences
.
2. Set the STORE / NON - STORE switch to the STORE
position ( button in ) .
6-17

Tektronix 2221 Specifications

General

Brand	Tektronix
Model	2221
Category	Test Equipment
Language	English