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18
Applications
III
A. MEASURING THE AMPLITUDE
- Measure the distance between the peaks, c.j/. 3 div. (see Fig. 5)
- Determine the position of knob "Y AMI*!./
1
(continuous attenuator in position " x l"j, e.g. 10 V/div.
Now the amplitude amounts to 10 (attenu;,i
0
r position) x3 (picture
height) = 30 V.
\.
PEM 217
EI:S
K- 5. Measuring the amplitude
B. USING THE X INPUT
The following examples can be mentioned:
Frequency measurements
Phase measurements
Displaying characteristics
Etc.
Frequency measurement by means of Lissajous figures
If a voltage of unknown frequency is applied to the Y amplifier, the light
spot on the screen will describe a so-called Lissajous figure, under the
influence of a voltage of known frequency applied to the X amplifier.
Dependent on the frequency the image will show a certain number of
peaks. The unknown frequency
number of peaks at the top
X known frequency.
number of peaks at the side
Some common Lissajous figures are shown in Fig. 6, in which 50 c/s is
used as reference frequency.
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