total
deflection factor in the ADD mode
is
equal
to
the
deflection factor indicated by either VOLTS/DIV switch
(when both VOL TS/DIV switches are set
to
the same
position factor). A common use for the ADD mode
is
to
provide a de offset for a signal riding on a
de
level.
The following general precautions should be observed
when using
the
ADD mode:
1. Do
not
exceed the input voltage rating
of
the
oscilloscope.
v v
v
J/
v
~
l
..
~
..
POSITIVE
LEVEL
ov ov
2.
Do
not
apply signals
that
exceed the equivalent
of
about eight times the VOLTS/DIV switch settings,
since large voltages may distort the display. For
example, with a VOLTS/DIV switch setting
of
0.5,
the voltage applied
to
that
channel should not exceed
about
four volts.
EXAMPLE: Using the graticule center line
as
zero volts,
the Channel 1 signal
is
on a three-division, positive de level
(see Figure 16A).
.J
"'
lL
L
v v
/
NEGATIVE
OFFSET
" I
1
44
(AI
CHANNEL
1
SIGNAL
WITH 3 DIVISIONS OF
POSITIVE
DC
LEVEL.
'!
(8)
CHANNEL
2 DISPLAY
WITH 3 DIVISIONS OF
NEGATIVE
OFFSET.
Figure
16.
Algebraic
addition.
4658/DM44 Operators
,.,
(C) RESULTANT DISPLAY
465/DM·O·l
@
I
I
I
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