I
I
I
I
I
I
I
I
I
1. Multiply 3 divisions by
the
VOLTS/DIV switch
setting
to
determine
the
de-level value.
2.
To
the Channel 2 input apply a negative de
level
(or a
positive level, using
the
Channel 2 INVERT switch)
of
the value determined (see Figure
168).
3.
Depress
the
ADD push
button
to
put
the
resultant
display within the operating range
of
the POSITION
controls (see Figure 16C).
4.
Release the
CH
1 and
CH
2 push buttons
to
eliminate
possible confusion, if you wish
to
view the ADD
display only.
COMMON-MODE REJECTION
The ADD mode can also be used
to
display signals
that
contain undesirable components. These undesirable com-
ponents can
be eliminated through common-mode
rejection. The precautions given under
the
preceding
Algebraic Addition should be observed.
EXAMPLE: The signal applied
to
the Channel 1
input
contains unwanted line frequency components (see Figure
17A). To remove
the
undesired components use the follow-
ing
procedure:
CH1SIGNAL
l
~------~~
WITH UNWANTED J
·,
"'-
LINE
FREQUENCY
1
"'!
....
!'.;.·
.
~·
................
I--.;~
COMPONENT
to
,__
1--
'...
.
.....
--
..
'
CH
2
SIGNAL
FROM
LINE
FREQUENCY
SOURCE
(INVERTED)
SIGNAL
WITH
....
v '
....
10
/
-"'
~
.:-
.....
.
y·..
.
..............
.
lA)
CH
1
AND
CH 2 SIGNALS.
.~
...
to--4-~--4---~-r--r--+--~-+--;
...
_
---------
LI~~~~~~~~~CY
f++H..f<~++tf+++tfH+<~++J:+++-~'++if++++f++++1i++'t+f
CANCELED
OUT
1---
-
----------------
•y--+---i--+-~~+--~-+--~-+--1
y·
...
I
B)
RESULTANT
SIGNAL.
1731·19
Figure 17. Common-mode rejection.
@
465B/DM44
Operators
45
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