I
I
I
I
I
I
I
I
I
the
baseline
to
the
bottom
graticule line.
If
a negative
voltage
is
to
be measured, position
the
baseline
to
the
top
graticule line.
4.
Switch
the
AC-GND·DC switch
to
DC. Measure
the
divisions
of
vertical deflection between
the
reference
line and
the
desired
point
on
the
waveform (see
Figure 15).
-L
:EGATIVE
REFERENCE
LINE
~
I
·~····
. .
..
...
dx
....
....
..
.
..
.
...
.
...
90
:t
--
----
,
T---
1
VERTICAL
DEFLECTION
MEASURE
L-
AMPLITUDE
1
..
ATOB
i-"'
....
....
.
...
OR
..
NEGATIVE
AMPLITUDE
1
CTO
B
_(f)/
465/DM-0·7
Figure 15. Instantaneous voltage measurement.
5. Calculate instantaneous voltage, using
the
following
formula:
In
stan·
taneous
Voltage
vertical
distance X
(divisions)
polarity
(+or-)
VOLTS/DIY
X switch
setting
Also include
the
attenuation
factor
of
the
probe
being used, if it
is
not
a 1
OX
scale-factor-switching
probe.
EXAMPLE:
The
vertical distance measured
is
4.6
divisions (see Figure 15).
The
waveform
is
above
the
reference line, and
the
VOL
TS/DIV
switch
is
set
to
2 .
Substituting
the
given values:
Instantaneous Voltage
=
4.6
X (+1) X 2 V = +9.2
volts.
ALGEBRAIC ADDITION
With
the
VERT
MODE switch
in
the
ADD position,
the
waveform displayed
is
the
algebraic sum
of
the
signals
applied
to
the
Channel 1
and
Channel 2
inputs
(CH
1 + CH
2).
If
the
Channel 2 INVERT switch
is
depressed,
the
waveform displayed
is
the
difference
of
the
signals applied
to
the
Channel 1 and Channel 2 inputs (CH 1 -
CH
2).
The
@
465B/DM44
Operators
43
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