4. INTRODUCTION TO CRO
Versatile electronic instrument giving visual
display of signals
Used for measurement of frequency ,
amplitude, phase etc.
Also used in determining the nature and
characteristics of various components.
Has a high bandwidth range thus making it a
sensitive and accurate device.
Easier to use as the internal routine act as a
guide to the user.
15. The most common one is of - TWO INPUTS
.
Although FOUR and EIGHT inputs are
available for special applications
16. There are primary two types of multi-input
oscilloscope :-
Single Beam Oscilloscope
Dual Beam Oscilloscope
Both of them can be converted into a further
Number of traces.
18. Dual Trace Oscilloscopes
In this oscilloscope two separate
vertical input channels are used.
There are two common operating modes
for the Electronic Switch, called
Alternate and Chop which can be selected
from the instrument’s front panel.
27. Lissajous Pattern
When two sinusoidal voltage signals of
equal frequency having some phase
difference are applied to the deflection
plates of CRO, a straight line or an
ellipse appears on the screen these
figures are called Lissajous figures or
Lissajous curves or pattern.
29. With the help of lissajous figures we
can measure…….
Frequency
Phase
30. Frequency
Measurement
Fx/Fy = Hp/Vp
Fx = Unknown frequency
Fy = Known frequency
Hp = Points on horizontal tangencies
Vp = Points on vertical tangencies
34. Advantage Of DSO
Stores waveform for infinite time
Digitize waveform can be processed in any way
Writing speed is more
Processing of signal is easy
36. Briefings
Trace storage is an extra feature
They used direct-view storage CRTs
The storage is accomplished using the
principle of secondary emission
37. Difference between ASO & DSO
DSO ASO
Data can be stored Data can be stored for
to infinite time finite time
Image quality is Image quality is not
good poor
Writing speed is high Writing speed is poor
Processing of signal Processing of signal is
is easy difficult