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Introduction - PowerPoint PPT Presentation

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Introduction
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  1. Introduction • What is an oscilloscope?

  2. Introduction • A graph-displaying device of electrical signal • X axis: Time • Y axis: Voltage • Z axis: Intensity or brightness

  3. Introduction • Information given by oscilloscopes • Time and voltage • Frequency and phase • DC and AC components • Spectral analysis • Rise and fall time • Mathematical analysis

  4. Control panel of an oscilloscope • Vertical Section • Horizontal Section • Trigger Section

  5. Basic setting • Vertical system • attenuation or amplification of signal (volts/div) • Horizontal system • The Time base (sec/div) • Trigger system • To stabilize a repeating signal and to trigger on a single event

  6. Analog oscilloscope • Real-time display of signals • Block diagram • Sweep generator and vertical amplifier • Earthquake recorder

  7. Digital oscilloscope • Capture and view events • Digital storage oscilloscope (DSO)

  8. Digital oscilloscope (contd.) • Sampling • Interpolation

  9. Advantage of Digital Scope • Trend towards digital. • Easy to use. • One-shot measurement • Recoding • Triggering • Data reuse • Connectivity

  10. Probes • Components

  11. Probes • High quality connector • High impedance (10M) • 50 for high frequency measurement

  12. 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

  13. Active probe • Signal conditioning ⇒ oscilloscope • Require power source • Good for high speed digital signals over 100MHz clock frequency