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A laser pointer at 2B FPS [video]

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615 points thunderbong | 4 comments | 19 Oct 25 06:42 UTC | HN request time: 1.144s | source
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Neywiny ◴[20 Oct 25 01:49 UTC] No.45639559[source]▶
I thought his method of multiplexing the single channel was very smart. I guess it's more common on 2 channel or high end 4 channel scopes to have a dedicated trigger input, which I've checked this one doesn't have. That said, there're digital inputs that could've been used. Presumably from whatever was controlling the laser.
replies(1): >>45651360 #
estimator7292 ◴[21 Oct 25 01:06 UTC] No.45651360[source]▶
Frankly it's uncommon to not have a trigger input. I'm not sure I've ever seen a DSO in person without a trigger in.
replies(2): >>45651844 #>>45654472 #
1. MBCook ◴[21 Oct 25 02:35 UTC] No.45651844[source]▶
I was confused by that part of the video exactly because I wondered why he wasn’t using the trigger input. Or, would it normally be possible to use a different channel as the trigger for the first channel?
replies(1): >>45651904 #
2. db48x ◴[21 Oct 25 02:44 UTC] No.45651904[source]▶
He explained that. His inexpensive oscilloscope _can_ trigger from the second channel, but only at one billion samples per second. Where’s the fun in that?
replies(1): >>45655507 #
3. MBCook ◴[21 Oct 25 13:26 UTC] No.45655507[source]▶
Oh that’s right. I saw this video earlier in the week and forgot that.

Thanks.

replies(1): >>45657157 #
4. db48x ◴[21 Oct 25 15:40 UTC] No.45657157{3}[source]▶
You’re welcome.