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M E A S U R E M E N T O F T H E V O L T A G E BETWEEN T W O
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 A C , adjusting VOLTS/DIV and SWEEP
TIME/DIV for a normal display. Set the VARIABLE con-
trol to C A L position.
2. Using the •
POSITION control, adjust the waveform
position such that one of the two points falls on a C R T
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 w i t h
P O S I T I O N .
Fig. 17
[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 1 0 : 1 . (See Fig. 17)
Substituting the given value:
Voltage between two points = 4.4 (div) x 0.2(V) x 1 0 = 8.8V
2 0
Points t o be measured
Adjust to the horizontal
scale w i t h *
POSITION.
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
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
the
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