Tektronix 2212 - Common-Mode Rejection Measurement

Non-Storage Examples
Common-Mode Rejection
Measurement
3-8
The ADD mode can also be used to display signals which contain
undesirable frequency components. The undesirable components
can be eliminated through common-mode rejection. Observe the
precautions given under the preceding Algebraic Addition proce-
dure.
D
CH1 SIGNAL
WITH UNWANTE
FREQUENCY
COMPONENT
D__.
CH2SIGNAL
FROMUNWANTE
FREQUENCY
SOURCE
(INVERTED)
Tri!
;,
V.-.
....
~
~
"'
..--
--
_/
r---.....
;,-.....
/
1)11, ..
.... ....
....
....
20V 20V
(A) CH1 AND CH2 SIGNALS
AC
IIJ:RT
....
....
. ...
. ...
. ...
........
-
V __..
:"--.,.
.......
__.. V
~
-
,;'
"
....
....
....
....
. ...
10
ns
Tri! AC
11-=RT
100,,
CH1 SIGNAL
W~~:~D ~:;;;!;=;:j:;:;;;;;;;;j;;;;~:;;;;;;;;;;j;;;;;;;;;~:;;;;;;l;;;;;:;;;l;:;;;;;;;;;j;;;;;;;;;;;;(
COMPONENT ---- ..._
CANCEUED
OUT
IJ'll,,,
(BJ RESULTANT SIGNAL
10111s
Figure 3-4: Common Mode Rejection Measurement
Measurement Examples