What is the optimal time-base setting for a c.r.o display?

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Homework Help Overview

The discussion revolves around determining the optimal time-base setting for a cathode ray oscilloscope (C.R.O) display, focusing on how to visualize signal cycles effectively. The subject area includes concepts related to waveforms and signal analysis.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants explore the calculation of the period of revolution and how it relates to time-base settings. Questions arise about estimating suitable settings based on the display width and the number of cycles visible. There is also consideration of how different settings affect the visibility of pulses.

Discussion Status

Participants are actively discussing various approaches to estimating the optimal time-base setting. Some guidance has been offered regarding the need to select a setting that allows for clear visibility of separate pulses, but there is no explicit consensus on the best approach yet.

Contextual Notes

There is mention of the display width and the need to consider both positive and negative voltages of the signal as it passes through the coil, indicating potential constraints in the setup or assumptions about the signal characteristics.

Janiceleong26
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Homework Statement



image.jpg

How to find the time-base setting?

Homework Equations


None

The Attempt at a Solution


Firstly, I calculated the period of the revolution..
3000 Rev -> 60s
1 Rev -> 0.02s
Then, how to calculate the time base setting?

Do we need to estimate which is the most suitable one?
If the display is 10cm wide then, 0.1/0.02= 5 rev ?
 
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Yes, estimating the most suitable one is the way to go. Work out how many cycles of the signal will appear on the display for each of the timebase settings and select one that will most distinctly show (to the naked eye) separate pulses.
 
gneill said:
Yes, estimating the most suitable one is the way to go. Work out how many cycles of the signal will appear on the display for each of the timebase settings and select one that will most distinctly show (to the naked eye) separate pulses.
Ok, thanks !
 
This is a tricky question. Obviously the slowest setting will show the most pulses, but will they appear too close together? The fastest setting might show only one pulse or only part of it. Also the pulse should go both positive and negative (volts) as the magnet passes the coil.
 

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