Tektronix 2221 User Manual

Basic
Applications --
2221
Operators
1.
Preset
instrument
controls and
obtain a
baseline
trace
.
Continuing , for the unknown signal the VOLTS / DIV
switch
setting is
1 ,
and
the
peak
- to
-
peak
amplitude
spans
five
vertical divisions . The
Arbitrary
Deflection
Factor is
then
determined by
substituting
values
in
the
formula
:
2. Apply the
reference signal to either
vertical
channel
input and
set the
VERTICAL
MODE
switch
to
display
the
channel
used .
Arbitrary
Deflection
Factor
1.5 X 1 V /
div
1.5 V / div
3. Set
the
amplitude of
the
reference
signal
to
an
exact
number of
vertical
divisions by
adjusting the
VOLTS /
DIV
switch and
VOLTS / DIV
Variable
control .
The
amplitude of the
unknown
signal
can then be
deter
mined by
substituting
values
in
the
unknown
signal
ampli
tude
formula
:
Amplitude
1.5 V / div x 5 div = 7.5
4.
Establish a
vertical
conversion factor ,
using
the
fol
lowing
formula (
reference
signal
amplitude
must be
known ) :
FREQUENCY
Vertical
Conversion
Factor
Reference
Signal
Amplitude (
Volts
)
Vertical
Deflection
VOLTS DIV
Х
(
Divisions
)
Switch
Setting
The frequency of a recurrent signal can be determined
from its
time -
duration
measurement as
follows
:
1.
Measure the
time
duration of one
waveform
cycle
using the preceding " Time Duration " measurement pro
cedure .
5.
Disconnect
the
reference
signal
and
apply
the
un
known
signal to
be
measured to the
same
channel
input
.
Adjust the
VOLTS
/
DIV
switch
to
a
setting
that provides
sufficient
vertical
deflection to
make an
accurate
measure
ment . Do
not
readjust the
VOLTS
/ DIV
Variable
control
.
2.
Calculate the
reciprocal of the time -
duration value to
determine the
frequency of
the
waveform .
UU
6.
Establish an
arbitrary
deflection
factor
,
using
the
fol
lowing
formula
:
EXAMPLE : The
signal
in
Figure 6-5 has a
time
duration
of
16.6
ms .
Arbitrary
Deflection
Factor
Vertical
VOLTS
/ DIV
Conversion X
Switch
Factor
Setting
Calculating the reciprocal of time duration :
Frequency
1
Time
Duration
1
16.6
ms
60
Hz
7.
Measure the
vertical
deflection of
the
unknown
sig
nal in
divisions
and
calculate its
amplitude
using the
follow
ing
formula :
RISE
TIME
Unknown
Signal
Amplitude
Arbitrary
Vertical
Deflection X
Deflection
Factor
(
Divisions )
EXAMPLE :
The
reference
signal
amplitude
is
30 V
,
with
a
VOLTS /
DIV
switch
setting of 5
V
and the
VOLTS
/
DIV
Variable
control
adjusted
to
provide
a
vertical
deflection
of
exactly 4
divisions
.
Rise
-
time
measurements use
the
same
methods as
time
duration
,
except that the
measurements
are
made
between
the 10 %
and 90 %
points on
the
leading
edge of
the
waveform ( see
Figure
6-6
) . Fall
time is
measured
between
the 90 %
and 10 %
points on
the
trailing
edge of
the
waveform .
Substituting these values in
the Vertical
Conversion
Factor
formula :
1.
Preset
instrument controls
and
obtain
a
baseline
trace .
Vertical
Conversion
Factor
30 V
4
div
x
5 V
/
div
-1.5
2. Apply an
exact 5 -
division signal to
either
vertical
channel
input
connector and
set the
VERTICAL
MODE
6-8

Tektronix 2221 Specifications

General

Brand	Tektronix
Model	2221
Category	Test Equipment
Language	English