Products > Test Equipment

New toy(?) scope, DSO154pro, 1ch, claimed 40MS/s

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BillyO:
If you want to play around with it the tool is here: https://www.ultracad.com/square.htm

Dave_g8:
Hi Bill.
See below a simulation of a 1MHz square wave with a 100ps rise/fall time passed through a 20MHz low pass filter.

BillyO:

--- Quote from: Dave_g8 on March 26, 2024, 05:54:36 pm ---Hi Bill.
See below a simulation of a 1MHz square wave with a 100ps rise/fall time passed through a 20MHz low pass filter.

(Attachment Link)

--- End quote ---
Correct, and that would be the response of an analog scope.  I have no problem with that.

Oh, okay.  I get what you are saying.  Yes, the 40MHz sample rate will have an effect as harmonics beyond the 16th or so will not even be detected.

Sorry for the misunderstanding.  My mind was in a different place.

Dave_g8:
Hi Bill,
No problem.
It is the sin(x)/x reconstruction without any anti-aliasing filter feeding the ADC that screws things up when injecting a square wave with fast edges.
That's why the square wave from the DSO154Pro test generator look reasonable, because it is effectively band limited.
Regards, Dave

BillyO:

--- Quote from: Dave_g8 on March 26, 2024, 06:36:17 pm ---Hi Bill,
No problem.
It is the sin(x)/x reconstruction without any anti-aliasing filter feeding the ADC that screws things up when injecting a square wave with fast edges.
That's why the square wave from the DSO154Pro test generator look reasonable, because it is effectively band limited.
Regards, Dave

--- End quote ---
Yes, agreed.

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