Tektronix 2205, Operator'S Manual

Page: 47 / 91

Applications
C H I— SIGNAL
WITH UNWANTED
LINE FREQUENCY “
COMPONENT
CH 2 — SIGNAL
FROM LINE '3
FREQUENCY
SOURCE
INVERTED
. ..>
v -
t i
>
N
’v
>
■s.
iT rt
{ ¥ lf $
r ;
■ V
C H I AND CH 2 SIGNALS
IUU
SIGNAL WITH
LINE FREQUENCY
COMPONENT
CANCELED
t
" 1
. I ! .
- -
. 1 .
RESULTANT SIGNAL
6 7 1 7 - 0 6
3
Figure 3 -3 . Com m on-m ode rejection.
2. Set the amplitude of the reference signal to 5 vertical divi­
sions by adjusting the VOLTS/DIV and VOLTS/DIV Variable
(CAL) controls.
3. Disconnect the reference signal and apply the unknown sig­
nal to the same channel input. Adjust the vertical position of
the waveform so that its bottom edge just touches the 0%
line on the crt.
4. Horizontally position the waveform so that its topmost fea­
tures cross the center vertical graticule line (see Fig­
ure 3 -4 ).
2205 Operator’s
3-7