Tektronix 2221 User Manual

O
Basic
Applications
-
2221
Operators
Substituting these
values
into the
formula :
TIME
CHANGE
C
ATI
=
5.25
AV2-1
.
ZAY
Slope
1.74 V
5.42 S
0.32
V / S
100
90
VOLTAGE
CHANGE
LOW -
LEVEL SIGNAL
MEASUREMENTS
ACTIVE
CURSOR
AT
SECOND
POINT OF
INTEREST
10
02
П
П
П
П
01.57
ils
CURSOR AT FIRST
POINT OF INTEREST
A displayed signal acquired in STORE mode at 5 mV
per division may be vertically expanded up to ten times .
Figure
6-22 is an
illustration
of a
4 mV
peak
-
to -
peak
signal
being
displayed
at 2 mV
per
division . The stair -
step
pat
tern is
due to
the
small
changes of
signal applied to
the
digitizing
circuitry
when
STORE
mode is
used to
acquire
the
waveform . The
numerous
spikes
in
the
waveform
are
due to
the
noise
accompanying the
signal .
4998-23
Figure
6-21
.
Slope
using
cursors
.
The
AVERAGE
Processing
mode
may be
used to
reduce
, or
even
eliminate
, the
noise
displayed
with
the sig .
nal .
Even
though the
signal
-
level
changes
applied to
the
digitizing
circuitry
are
small ,
processing of
the
average
waveform
data
results in a
smooth
display of
the
signal
.
5.
Press the
SAVE
/
CONT
switch to
activate
SAVE
mode
to
save the
acquired
waveform and to
provide
a
more stable
display
for
measurement .
6.
Use the
CURSORS control to
move the
active
cur
sor to the
first point of
interest
.
Figure
6-23
is
an
illustration
of the
same
signal
level
as
displayed in
Figure 6-22 ,
but the
waveform was
averaged
before
being
displayed
.
Low -
level signals can be
acquired
in the
same
manner as
explained in
previous
acquisition
procedures
.
External
triggering
may be
helpful
for
produc
ing a
stable
display if the
amplitude of
the
signal
being
acquired
is
very low
. All
measurement
procedures
described in the
preceding part of this
manual are also
valid
for
low
-
level
signals
.
7.
Push the
SELECT C1 / C2
button
to
select the
other
cursor
, and
use the
CURSORS
control
to
position
the
cur
sor to the
second point of
interest
.
O
8.
Read the
voltage
difference
between
cursors
from
the crt
readout .
9.
Read
the
time
difference
between
the
two
mea
surement
points
from the crt
readout .
100
i
90
10.
Slope
is
determined by
using
the
measured
voltage
and
time
to
calculate the
rate
of
change
using the
follow
ing
formula :
V
А
A
a
4mV
P -
P
10
|
i
Slope (
rate of
change )
Change in
voltage
Change
in
time
2mV
!
4998-24
As an
example
, in
Figure
6-21 ,
the
voltage
difference
between the
measurement
points is 1.74 V ,
and the
time
difference is
5.42
s .
Figure 6-22 .
Low - level
signal ,
STORE mode .
O
6-21

Tektronix 2221 Specifications

General

Brand	Tektronix
Model	2221
Category	Test Equipment
Language	English