Tektronix 2221 User Manual

Basic
Applications —
2221
Operators
ting , since
large
voltages
may
distort the
display
.
For
example
,
with a
VOLTS /
DIV
switch
setting
of 0.5 V ,
the
voltage
applied
to
that
channel
input should not exceed about 4 volts .
rejection . The
precautions
given under the
preceding
' Algebraic Addition " procedure should be observed .
EXAMPLE : The
signal applied to the
Channel
1
input
connector
contains
unwanted
frequency
components
( see Figure 6-4A ) . To remove the undesired com
ponents , use the following procedure :
EXAMPLE
:
Using the
graticule
center line
as V
, the
Channel 1
signal
is
at a 3 -
division ,
positive dc
level
(
see
Figure 6-3A ) .
1. Preset
instrument
controls
and
obtain a
baseline
trace
.
1.
Multiply
3
divisions
by
the
VOLTS
/
DIV switch
setting
to
determine the dc -
level value .
2. Apply the signal containing the unwanted com
ponents
to
the
Channel
1
input .
2.
To
the
Channel 2
input
connector
,
apply a
negative
dc level ( or positive level , using the Channel 2 INVERT
switch
)
whose
value
was
determined in
step 1 (
see
Figure
6-3B ) .
3. Apply the
unwanted signal to the
Channel
2
input .
4.
Select
BOTH
and ALT
VERTICAL
MODE
and
press
in the
Channel 2
INVERT
button
.
3.
Select
ADD and
BOTH
VERTICAL
MODE to
place
the
resultant
display
within the
operating
range of
the
Vertical
POSITION
controls (
see Figure
6-3C
) .
5. Adjust the Channel 2 VOLTS / DIV switch and Vari
able
control
so
the
Channel
2
display
is
approximately the
same amplitude as the undesired portion of the Channel 1
display ( see Figure 6-4A ) .
L
COMMON
-
MODE
REJECTION
The
ADD
mode
can
also
be
used to
display
signals
that
contain
undesirable
frequency
components . The
undesir
able
components can be
eliminated
through
common
- mode
6.
Select
ADD
VERTICAL
MODE
and
slightly
readjust
the
Channel 2
VOLTS / DIV
Variable
control for
maximum
cancellation of
the
undesired signal
component (
see
Figure
6-4B
) .
}
ZZO
72
: 00
100
100
90
90
POSITIVE LEVEL
M
OV
OV
NEGATIVE OFFSET
ID
.
|
01
12
50mV
50us
50mV
50us
50mV + SØmV
Sous
( C ) RESULTANT DISPLAY .
( A ) CHANNEL 1 SIGNAL
WITH 3 DIVISIONS OF
POSITIVE
DC
LEVEL .
( B ) CHANNEL 2 DISPLAY
WITH 3 DIVISIONS OF
NEGATIVE OFFSET .
4998-32
Figure 6-3 . Algebraic addition ,
u
6-6
u

Tektronix 2221 Specifications

General

Brand	Tektronix
Model	2221
Category	Test Equipment
Language	English