Tektronix 2221 User Manual

Basic
Applications
-
2221 Operators
B
EXAMPLE
:
The
horizontal
distance
between
the
10 %
and 90 %
points is 5
divisions
( see
Figure 6-6 ) ,
and the
SEC
/
DIV
switch
is
set to
1 us .
The X10
magnifier
knob
is
pushed in ( X1
magnification
) .
100
90
П
Л
П
П
П
П
А
Substituting the given values in the formula :
SIGNAL
AMPLITUDE
MEASURE
TIME
FROM
ATO
( B
Rise Time
5
div x 1
us /
div
5
us
17
lus
TIME
DIFFERENCE
BETWEEN
TWO
TIME
-
RELATED
PULSES
HORIZONTAL
DISTANCE
4998-35
The
calibrated sweep
speed and dual -
trace
features of
the
instrument
allow measurement
of the
time
difference
between two
separate
events
.
To
measure
time
difference ,
use the
following
procedure :
Figure 6-6 . Rise time .
1.
Preset
instrument
controls
and
obtain a
baseline
trace .
П
switches to display the channel used . Ensure that the
VOLTS
/ DIV
Variable
control
is in the
CAL detent .
NOTE
2. Set
the
TRIGGER INT
switch
to
CH 1 .
For rise time greater that 0.2 us , the VOLTS DIV
Variable
control may be
used
to
obtain
an
exact 5
division
display
3.
Set both
AC
-
GND
-
DC
switches to
the
same
posi
tion ,
depending on the
type of input
coupling
desired
.
3. Set
the
TRIGGER
SLOPE switch to OUT
. Use a
sweep
-
speed setting that
displays
several
complete
cycles
or
events ( if
possible
) .
4. Using
either
probes or cables
with equal
time
delays , connect
a known
reference
signal to the
Channel 1
input and the comparison signal to the Channel 2 input .
4. Adjust the vertical positioning so that the zero refer
ence of
the
waveform
touches
the
%
graticule line
and
the
top of
the
waveform
touches the
100
%
graticule line
( see Figure 6-6 ) .
5. Set
both
VOLTS / DIV
switches
for 4.
or 5 -
division
displays .
5.
Set
the
SEC
/
DIV
switch for a
single -
waveform
display
, with
the rise
time
spread
horizontally
as
much as
possible
.
6.
Select
BOTH
VERTICAL
MODE
;
then select
either
ALT
or
CHOP
,
depending on
the
frequency of the
input
signals
.
7. Adjust the
TRIGGER LEVEL control
for a stable
display .
6.
Horizontally
position
the
display
so
the 10 %
point on
the
waveform
intersects the
second
vertical
graticule line
( see Figure 6-6 , Point A ) .
П
П
1
П
n
П
П
П
8. Set
the
SEC
/ DIV
switch
to
a
sweep
speed
which
provides three or
more
divisions of
horizontal
separation
between the
reference
points
on
the
two
displays
.
Center
each of the
displays
vertically ( see
Figure 6-7 ) .
7.
Measure the
horizontal
distance
between
the
10 %
and 90 %
points and
calculate the time
duration
using the
following
formula
:
Rise
Time
Horizontal Distance
(
Divisions
)
SEC /
DIV
Switch
Setting
Magnification Factor
9.
Measure the
horizontal
difference
between
the
two
signal reference points and calculate the time difference
using the
following
formula
:
Х
6-9

Tektronix 2221 Specifications

General

Brand	Tektronix
Model	2221
Category	Test Equipment
Language	English