Tektronix 2236 User Manual

Operating
Procedures -
2236 Operators
Algebraic
Addition
6. If
necessary ,
repeat
Step 4
using a
different
reference
line which
allows the
waveform in Step 5 to
be
displayed on
screen .
o
7. Adjust the A TRIGGER LEVEL control to obtain a sta
ble
display .
With the VERTICAL MODE switches set to BOTH and
ADD , the waveform displayed is the algebraic sum of the
signals applied
to the Channel
1 and Channel
2 inputs ( CH 1
+ CH 2 ) . If the Channel 2 INVERT button is pressed in , the
waveform displayed is the difference between the signals
applied to the Channel 1 and Channel 2 inputs ( CH 1 – CH
2 ) . When both VOLTS / DIV switches are set to the same
deflection factor , the deflection factor in the ADD mode is
equal to the
deflection factor
indicated by
either VOLTS
/ DIV
switch .
8. Set the A SEC / DIV switch to a position that displays
several
cycles
of
the
signal
.
n
n
П
П
П
П
П
П
П
on
9. Measure the divisions of vertical deflection between
the ground reference line and the point on the waveform at
which the level
is to be
determined ( see Figure
4-2 ) .
The
following
general
precautions should be
observed
when using the
ADD
mode .
a . Do not exceed the input voltage rating of the
oscilloscope .
POSITION TO
CENTERLINE
100
B
b . Do not apply signals that exceed the equivalent of
about eight times the VOLTS / DIV switch settings ,
since large voltages may distort the display . For ex
ample , with a VOLTS / DIV switch setting of 0.5 , the
voltage applied to that
channel
should not
exceed
ap
proximately
4
volts
.
90
А
VERTICAL
DEFLECTION
C. Use Channel 1 and Channel 2 POSITION control
settings which
most nearly
position
the signal on
each
channel to midscreen , when viewed in either CH 1 or
CH 2
VERTICAL
MODE .
This
ensures the
greatest
dynamic
range for
ADD
mode operation
.
10
MEASURE
AMPLITUDE
FROM A TO
B
d . To attain similar response from each channel , set
both the Channel 1 and Channel 2 Input Coupling
switches to the
same
position
.
1738-16
Fig . 4-2 . Instantaneous voltage measurement .
Common -
Mode
Rejection
10. Calculate the instantaneous voltage , using the follow
ing
formula
:
The
following procedure
shows
how
to
eliminate unwant
ed ac input
- power
frequency
components
. Similar
methods
could be used either to eliminate other unwanted frequency
components or
to
provide a
dc
offset
.
Instantaneous
Voltage
vertical
deflection x
polarity X
(
divisions
)
(
+
or-
)
П
П
П
п
VOLTS / DIV
switch
setting
indicated
by
1X
( or
10X
when
10X
probe is used )
1. Preset instrument controls and obtain a baseline trace .
EXAMPLE : The measured vertical deflection from the refer
ence line is 4.6 divisions ( see Figure 4-2 ) , the waveform
point is above the reference line , a 10X attenuator probe is
being used
, and the
VOLTS / DIV
switch is set
to 2 .
2. Apply the
signal
containing the
unwanted line
frequency
components
to the CH
1
input
connector .
Substituting the given values :
3. Apply a line - frequency signal to the CH 2 input connec
tor . To maximize cancellation , the signal applied to Channel
2 must be in phase with the unwanted line - frequency com
ponent on
the
Channel 1
input
.
Instantaneous
Voltage
4.6 div x ( +1 ) X 2 V / div
9.2 V.
C
П
П
4-3

Tektronix 2236 Specifications

General

Brand	Tektronix
Model	2236
Category	Test Equipment
Language	English