CIE A Level Physics復習筆記7.1.2 Cathode-Ray Oscilloscope
Cathode-Ray Oscilloscope
- A Cathode-Ray Oscilloscope is a laboratory instrument used to display, measure and analyse waveforms of electrical circuits
- An A.C. current on an oscilloscope is represented as a transverse wave. Therefore you can determine its frequency and amplitude
- The x-axis is the?time?and the y-axis is the?voltage (or?y-gain)
Diagram of Cathode-Ray Oscilloscope display showing wavelength and time-base setting
- The period of the wave can be determined from the?time-base?This is?how many seconds each division represents?measured commonly in?s div-1?or?s cm-1
- Use as many wavelengths shown on the screen as possible to reduce uncertainties
- Dividing the total time by the number of wavelengths will give the time period?T?(Time taken for one complete oscillation)
- The?frequency?is then determined through?1/T
Worked Example
A cathode-ray oscilloscope(c.r.o.) is used to display the trace from a sound wave. The time-base is set at 7 μs mm-1.
What is the frequency of the sound wave?
A? ? 2.4 Hz? ? ? ? ??B? ? ?24 Hz? ? ? ? ??C??? ?2.4 kHz? ? ? ? ??D??? ?24 kHz
Exam Tip
The time-base setting varies with units for seconds (commonly ms) and the unit length (commonly mm). Unit conversions are very important for the calculate of the time period and frequency
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