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 jack. Set
the vertical MODE to the channel to be
used.
Set the
AC-GND-DC
to AC, adjusting VOLTS/DIV and
SWEEP
TIME/DIV for a normal display. Set the VARIABLE
con-
trol
to 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
con-
trol.
If a probe is
used,
further multiply this by the attenua-
tion
ratio.
Using
the formula:
Volts peak-to-peak
=
Vertical distance (div) x (VOLTS/DIV setting) x (probe
attenuation ratio)
Adjust
to
the center
vertical
scale
with
[EXAMPLE]
For
the example, the two points are separated by 4.4 divi-
sions
vertically. Set the VOLTS/DIV setting be 0.2 V/div
and the probe attenuation be 10:1. (See Fig. 17)
ELIMINATION OF UNDESIRED SIGNAL
COMPONENTS
The ADD feature can be conveniently used to cancel out
the effect of an undesired signal component which may be
superimposed
on the signal you wish to observe. (See Fig.
18)
Procedure:
1.
Apply the signal containing an undesired component to
the CH1 INPUT jack and the undesired signal itself alone
to the CH2 INPUT jack.
2.
Set the vertical 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
INV.
3.
Set the vertical 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
Substituting the given value:
Voltage between two points = 4.4 (div) x
0.2(V)
x
10
=
8.8V
20
POSITION.
Points
to be
measured
Vertical
distance
between
two
points
Adjust
to
the horizontal
scale
with
*
POSITION.
Fig.
17
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