General > General Technical Chat
Examples of fast events for normal people
HighVoltage:
--- Quote from: Someone on June 20, 2022, 10:56:21 pm ---
(30cm/12") most people in metric countries still have a common cultural reference for that length.
--- End quote ---
33cm / 13" is more accurate and easier to remember.
RoGeorge:
--- Quote from: eugene on June 21, 2022, 03:33:52 pm ---I'm certain that if I were giving the talk (on oscilloscopes) I would share the entire Grace Hopper video, just because everyone should know who Grace Hopper was and get a chance to see her.
--- End quote ---
OK, but wrong reasons. A video is supposed to be watched for its good content, not for the fame of who's in it. You see, if you share that video for the reasons you stated, than that's just a shameless propaganda plug. If you share the same video for what she's teaching, that would be fair for everybody.
Maybe I'm too sensitive to nuances, but beware of propaganda and mind conditioning. That can take over people's behavior without them even noticing their mind was heavily pruned. Seen that before in the communist eastern world, and seeing it again recently, in the capitalist western world. It is happening at alarmingly high levels.
Peter Taylor:
The three D's of engineering. Define, Define, Define.
Define a perfect square wave in theory, then define the imperfect square wave in practice in relation to this.
An oscilloscope, and the circuit it is measuring, aren't perfect.
Define how close to perfect you want the signal to be, then define how closely you want the oscilloscope to show that signal, then define how closely you want that oscilloscope to show a perfect square wave, then see how close to perfect you can get.
It's like building an oscilloscope to measure the rise time of a circuit; that uses that circuit.
eugene:
--- Quote from: RoGeorge on June 21, 2022, 04:16:06 pm ---
--- Quote from: eugene on June 21, 2022, 03:33:52 pm ---I'm certain that if I were giving the talk (on oscilloscopes) I would share the entire Grace Hopper video, just because everyone should know who Grace Hopper was and get a chance to see her.
--- End quote ---
OK, but wrong reasons. A video is supposed to be watched for its good content, not for the fame of who's in it. You see, if you share that video for the reasons you stated, than that's just a shameless propaganda plug. If you share the same video for what she's teaching, that would be fair for everybody.
Maybe I'm too sensitive to nuances, but beware of propaganda and mind conditioning. That can take over people's behavior without them even noticing their mind was heavily pruned. Seen that before in the communist eastern world, and seeing it again recently, in the capitalist western world. It is happening at alarmingly high levels.
--- End quote ---
I thought it would be obvious that I also think the video has content that is worth watching and is relevant to the subject. I mean, you don't really believe that I would show irrelevant or worthless video just because I admire the people in it, do you?
In any case, Grace Hopper is an important figure in the history of computer science. Sharing real history cannot be considered propaganda, at least not in my perspective. Not sure how you could see it that way.
ebastler:
Seems that all of the examples in the sub-millisecond time range have been based on the propagation speed of light or electrical signals. And I can't come up either with something in the domain of mechanics, acoustics or such which would be relatable to the layperson, and happen on µs timescales or faster.
Maybe TV images can provide some "tangible" example numbers: The time it takes to transmit a picture frame (~ 10ms), a single line in the picture (~ 10 µs), and a single pixel (~ 5ns), all for a 1080p full HD image.
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