APPLICATION
MEASUREMENT
OF THE
VOLTAGE
BETWEEN
TWO POINTS ON A WAVEFORM
This technique
can be
used
to
measure peak-to-peak
voltages.
Procedure:
1.
Apply
the
signal
to be
measured
to the
INPUT,
set the V
MODE
to the
channel
to be
used
and
AC-GND-DC
to
AC,
adjusting VOLTS/DIV
and
SWEEP TIME/DIV
for a
normal display.
Set
VARIABLE
to the CAL
position.
2.
Using
the *
POSITION control adjust
the
waveform
position such that
one of the two
points falls
on a CRT
graduation line
and
that
the
other
is
visible
on the
display screen.
3. Using
the <>
POSITION control, adjust
the
second point
to coincide with
the
center vertical graduation line.
4.
Measure
the
vertical distance between
the two
points
and multiply this
by the
setting
of the
VOLTS/DIV
control.
If
a
probe
is
used, further multiply this
by the
attenuation ratio,
if any and if " x 5
GAIN"
is
used,
multiply
the
value
by 1/5 as
well.
Using
the
formula:
Volts Peak-to-Peak
= Vertical distance
(div) x
(VOLTS/DIV setting)
x (probe attenuation ratio)
x " x 5
GAIN" value
1
(1/5)
Adjust
to the
center vertical scale
with POSITION.
-
Points
to be
measured
I EXAMPLE]
For
the
example,
the two
points
are
separated
by 4.4
divisions vertically.
Let the
VOLTS/DIV setting
be
0.2V/div
and
the
probe attenuation
be 10:1.
Substituting
the
given value:
Voltage between
two
points
=4.4 (div) x 0.2 (V)
x 10 =
8.8V
ELIMINATION
OF
UNDESIRED SIGNAL
COMPONENTS
The
ADD
feature
can be
conveniently used
to
cancel
out the
effect
of an
undesired signal component which
is
riding
on
the back
of the
signal
you
wish
to
observe.
Procedure:
1.
Apply
the
signal containing
an
undesired component
to
the
CH1
INPUT
and the
undesired signal itself alone
to
the
CH2
INPUT.
2.
Set the V
MODE
to
DUAL (CHOP)
and
SOURCE
to
CH2.
Verify that
CH2
represents
the
unwanted signal
in reverse polarity.
If
necessary reverse polarity
by
setting
CH2 to INV.
3.
Set V
MODE
to ADD,
SOURCE
to V
MODE
and CH2
VOLTS/DIV
and
VARIABLE
so
that
the
undesired signal
component
is
cancelled
as
much
as
possible.
The
remaining signal should
be the
signal
you
wish
to
observe alone
and
free
of the
unwanted signal.
Signal containing undesired component
(Broken lines: undesired component envelope)
Undesired component signal
5-2
Vertical distance
between
two
points
Adjust
to the
horizontal scale
with POSITION.
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