Transcript Oscilloscopes - ResearchGate

Introduction
• What is an oscilloscope?
1
Introduction

A graph-displaying device of electrical signal



X axis: Time
Y axis: Voltage
Z axis: Intensity or brightness
2
Introduction

Information given by oscilloscopes






Time and voltage
Frequency and phase
DC and AC components
Spectral analysis
Rise and fall time
Mathematical analysis
3
Control panel of an
oscilloscope



Vertical Section
Horizontal Section
Trigger Section
4
Basic setting

Vertical system


Horizontal system


attenuation or amplification of signal (volts/div)
The Time base (sec/div)
Trigger system

To stabilize a repeating signal and to trigger on a single
event
5
Analog oscilloscope


Real-time display of signals
Block diagram


Sweep generator and vertical amplifier
Earthquake recorder
6
Digital oscilloscope

Capture and view events

Digital storage oscilloscope (DSO)
7
Digital oscilloscope (contd.)

Sampling

Interpolation
8
Advantage of Digital Scope







Trend towards digital.
Easy to use.
One-shot measurement
Recoding
Triggering
Data reuse
Connectivity
9
Probes

Components
10
Probes
High quality connector
 High impedance (10M)
 50 for high frequency measurement

11
Passive probe


10 attenuation
 Good for low circuit loading
 Suitable to high frequency signal
 Difficult to measure less than 10mV
signals
1 attenuation
 Good for small signals
 Introducing more interference
12
Active probe
Signal conditioning ⇒ oscilloscope
 Require power source
 Good for high speed digital signals over
100MHz clock frequency

13