1. Oscilloscope and its applications
Taif Aied Faisal
M.Sc. Laser and Optoelectronics Engineering

2. Oscilloscope (scope) is a visual voltmeter with a timer (clock) that shows when a voltage changes.
An analog scope uses a cathode ray tube (CRT) similar to a television screen to display voltage patterns.
Introduction

3. Types of Oscilloscope Analogue Oscilloscope
Digital Storage Oscilloscope
Digital Phosphor Oscilloscope
Digital Sampling Oscilloscope

4. Analogue Scope
Digital Storage Scope

5. Digital Phosphor Scope
Digital Sampling Scope

6. Scope Panel and Probe

7. Waves types

8. Analog and digital scope

9. Scope Division Screen

10. Scope Integration

11. Phase Shift Measurements
The difference in timing between two otherwise identical periodic signals is to use XY mode to measure the phase shift.
This measurement technique involves inputting one signal into the vertical system as usual and then another signal into the horizontal system .
It’s called an XY measurement because both the X and Y axis are tracing voltages, the waveform that results from this arrangement is called a Lissajous pattern.
From the shape of the Lissajous pattern, you can tell the phase difference between the two signals. You can also tell their frequency ratio.

12. Lissajous patterns for various frequency ratios and phase shifts

13. Sweep generator to produce one cycle of a sawtooth waveform when it receives a pulse at its input.
PG to produce periodical pulses with a period of T, which is equal to the period of the input signal.
X-Y Operation

14. Measuring light on photocell
Scientific data can be gathered by scope
A sensor creates electrical signal in response to physical stimuli; such as sound, mechanical stress, pressure, light, or heat.
The photocell converts light intensity into electrical signal.

15. Signal parameters V/div = 2V , T/div = 1ms Vp = 6V , Vp-p = 12 V
DC = 2 V, period = 3ms
Freq. = 333 hz

16. CRT Structure and main components of a CRT
Face plane of the CRO screen

17. Electron Gun
Electron gun provides a sharply focused electron beam directed toward the fluorescent-coated screen.
The thermally heated cathode emits electrons in many directions.
The control grid provides an axial direction for the electron beam and controls the number and speed of electrons in the beam.

18. The Deflection System
It consists of two pairs of parallel plates referred to as the vertical and horizontal deflection plates.
One of the plates in each set is permanently connected to the ground (0 V), whereas the other plate of each set is connected to input signals or triggering signal of the CRO.

19. Deflection work
A +V is applied to Y I/p e-beam deflect vertically upward
A –V is applied to Y I/p e-beam deflect vertically downward.
The same is for X I/p.

20. Applied Voltage Examples
=sin(t)