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M E A S U R E M E N T OF T H E V O L T A G E B E T W E E N T W O POINTS ON A
W A V E F O R M
T h i s technique can be used to measure peak-to-peak voltages.
Procedure:
1. Apply the signal to be measured to the INPUT jack. S e t the V or Y MODE to the chan-
nel to be used. Set the A C - G N D - D C to A C , adjusting V O L T S / D I V and S W E E P T I M E / D I V
for a normal display. S e t the V A R I A B L E to C A L .
2. Using the * POSITION control, adjust the waveform position such that one of the t w o
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 t w o points and multiply this by the setting
of the V O L T S / D I V control.
If a probe is used, further multiply this by the attenuation ratio.
Using the formula:
Volts Peak-to-Peak
= Vertical distance (div) x ( V O L T S / D I V setting) x (probe attenuation ratio)
[EXAMPLE]
For the example, the t w o points are separated by 4 . 4 divisions vertically. S e t the
V O L T S / D I V setting be 0 . 2 V/div and the probe attenuation be 1 0 : 1 . (See Fig. 10)
Substituting the given value:
Voltage between t w o points = 4 . 4 ( d i v ) x 0 . 2 ( V / d i v ) x 10 = 8 . 8 V
22
Adjust to the center
vertical scale with
•+
POSITION
Fig. 10
Points to be measured
Adjust to the horizontal
scale with ± POSITION
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