Tektronix 2221 User Manual

Basic
Applications
-
2221 Operators
CHANNEL 1 (
REFERENCE
)
CHANNEL 2
100
!
90
100
30
ܼܐܚ
50 %
AMPLITUDE
LEVEL
B
MEASURE
TIME FROM
ATO B
A
10
1
50mV 2.5V !
Sus
1V
50us
HORIZONTAL
DIFFERENCE
TIME DIFFERENCE
4998-36
( 5301-16 ) 6530-381
Figure 6-7 .
Time
difference
between
two time -
related puises . Figure
6-8
. Time
difference
between
repetitive
pulses
.
PHASE DIFFERENCE
Time
Difference
SEC / DIV
Horizontal Difference
X
Switch
Setting
(
Divisions )
Magntication
Factor
EXAMPLE :
The
SEC / DIV
switch
is
set to
50 us ,
the
X10 magnifier knob is pulled out , and the horizontal
difference
between
waveform
measurement
points is
4.5 divisions .
in a
manner similar to "
Time
Difference , " phase
com
parison
between
two signals
of the same
frequency
can be
made using the dual - trace feature of the instrument . This
method of
phase
difference
measurement can
be used
up
to the frequency limit of the vertical system . To make a
phase
comparison , use the
following
procedure
:
باب
Substituting the given values in the formula :
1. Preset
instrument
controls
and
obtain a
baseline
trace , then set the TRIGGER INT switch to CH 1 .
Time
Difference
50 us / div x
4.5 / div
10
=
22.5
us
2.
Set both AC -
GND
-
DC
switches to the
same
posi
tion , depending on the type of input coupling desired .
TIME
DIFFERENCE
BETWEEN
REPETITIVE
PULSES
1. Preset
instrument
controls
and obtain
a
baseline
trace .
3. Using either probes or coaxial cables with equal
time delays , connect a known reference signal to the
Channel 1 input and the unknown signal to the Channel 2
input .
2.
Select
a
VOLTS /
DIV
switch
setting
that
gives
about
5
divisions of
display
amplitude .
u
4.
Select
BOTH
VERTICAL
MODE ; then
select
either
ALT or
CHOP
,
depending on the
frequency
of
the input
signals .
The
reference
signal should
precede the
com
parison signal
in time .
3. Use
the
selected
channel
Vertical
POSITION
control
to
center
the
display
.
4.
Set the
SEC /
DIV
switch to
display
the
points of
interest
between
which the
measurement is to be
made
.
5. If
the two
signals are of
opposite
polarity ,
press in
the
Channel 2
INVERT button to
invert the
Channel
2
display .
5.
Read the
time
difference
between
pulses at the
points
of
interest
(
see
Figure 6-8 ) .
6. Set
both
VOLTS
/ DIV
switches and
both
Variable
controis so
the
displays are
equal
in
amplitude .
6-10
u

Tektronix 2221 Specifications

General

Brand	Tektronix
Model	2221
Category	Test Equipment
Language	English