Oscilloscopes
- 1. Introduction • What is an oscilloscope? 1
- 2. Introduction A graph-displaying device of electrical signal X axis: Time Y axis: Voltage Z axis: Intensity or brightness 2
- 3. Introduction Information given by oscilloscopes Time and voltage Frequency and phase DC and AC components Spectral analysis Rise and fall time Mathematical analysis 3
- 4. Control panel of an oscilloscope Vertical Section Horizontal Section Trigger Section 4
- 5. 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
- 6. Analog oscilloscope Real-time display of signals Block diagram Sweep generator and vertical amplifier Earthquake recorder 6
- 7. Digital oscilloscope Capture and view events Digital storage oscilloscope (DSO) 7
- 9. Advantage of Digital Scope Trend towards digital. Easy to use. One-shot measurement Recoding Triggering Data reuse Connectivity 9
- 11. Probes High quality connector High impedance (10M ) 50 for high frequency measurement 11
- 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 12
- 13. Active probe Signal conditioning ⇒ oscilloscope Require power source Good for high speed digital signals over 100MHz clock frequency 13