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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
i l
CH 1 SIGNAL
WITH UNWANTED
LINE FREQUENCY
COMPONENT
u
I t
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
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( 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
1 0
% .
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 signalof 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
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