Tektronix 2236 User Manual

Operating Procedures - 2236 Operators
U
4. Select BOTH and ALT VERTICAL MODE and set both
VOTLS
/ DIV
switches
to
produce
displays
of
approximately
four or five
divisions
in
amplitude .
2. Apply
the
reference
signal to
either
vertical
channel
input and set the
VERTICAL MODE
switch to display
the
channel used
.
u
5. Adjust the
CH 2 VOLTS
/ DIV switch
and CH 2
VOLTS / DIV Variable control so that the Channel 2 display is
approximately the same amplitude as the undesired portion
of the
Channel
1
display ( see Figure
4-3A ) .
3. Set the
amplitude
of the
reference
signal to
five
vertical
divisions
by
adjusting the
adjusting
the
VOLTS /
DIV
switch
and
VOLTS / DIV Variable control .
6. Select ADD VERTICAL MODE and press in the IN
VERT button , and slightly readjust the CH 2 VOLTS / DIV
Variable control for maximum cancellation of the undesired
signal component ( see Figure 4-3B ) .
4. Disconnect the reference signal and apply the un
known signal to be measured to the same channel input .
Adjust the vertical position of the waveform so that its bot
tom edge just
touches
the
% line on the
CRT .
u
u
-
5. Horizontally position the waveform so that its top most
features cross the center vertical graticule line ( see Figure
4-4 ) .
100
il
CH 1 SIGNAL
WITH UNWANTED
LINE FREQUENCY
COMPONENT
u
It
6. Read the percent ratio directly from the graduations of
the center line , referring to the % and 100 % percentage
marks on the left
edge of the
graticule
( 1 minor
division
equals 4 % for a 5 - division display ) .
U
CH 2
SIGNAL
FROM
LINE
FREQUENCY
SOURCE
u
( A ) CH 1 AND CH 2 SIGNALS .
REFERENCE
SIGNAL
100
101
L
L
-
-
1
- - -
90
SIGNAL
WITH
LINE
FREQUENCY
COMPONENT
CANCELED
OUT
u
-
UNKNOWN
SIGNAL
10
% .
FO
1
( B ) RESULTANT SIGNAL .
3832-15
u
READ
PERCENT
RATIO
Fig . 4-3 . Common - mode rejection .
4205-16
Fig . 4-4 .
Voltage ratios .
TELEVISION
DISPLAYS
Amplitude Comparison ( Ratio )
In some applications it may be necessary to establish a
set of deflection factors other than those indicated by the
VOLTS / DIV switch settings . This is useful for comparing
unknown signals to a reference signal of known amplitude .
To accomplish this , a reference signal of known amplitude is
first set to an exact number of vertical divisions by adjusting
the VOLTS / DIV switch and Variable control . Unknown sig
nals can then be quickly and accurately compared with the
reference signal without disturbing the setting of the
VOLTS / DIV Variable control . This procedure is as follows :
1. Preset instrument controls and obtain a baseline trace .
TV
Line
Signal
The following procedure is used to display a TV Line
signal
.
1. Preset instrument controls and select P - P AUTO / TV
LINE A TRIGGER Mode .
4-4

Tektronix 2236 Specifications

General

Brand	Tektronix
Model	2236
Category	Test Equipment
Language	English