Tektronix 475A - Common Mode Rejection; Algebraic Addition

POSITIVE BEVEL
hg
{A} CHANNEL 1 SIGNAL
WITH 3 DIVISIONS OF
POSITIVE DC LEVEL.
{B} CHANNEL 2 DISPLAY
WITH 3 DIVISIONS OF
NEGATIVE OFFSET.
(C) RESULTANT DISPLAY
465/DM-0-19
Fig. 16. Algebraic addition.
COMMON-MODE REJECTION
The ADD mode can be used to display signals that
contain undesirable components. These undesirable
components can be eliminated through common mode
rejection. The precautions given under algebraic addition
should be observed.
EXAMPLE: The signal applied to the CH 1 input.
contains unwanted line frequency components (see Fig.
17A). To remove the undesired components use the
following procedure.
1. Connect a line frequency signal to the CH 2 input.
2. Set the VERT MODE switch to ALT and the CH 2
INVERT switch to on (button in). Adjust the CH 2
@
+
475A/DM44
Operators
35