Products > Test Equipment

Building my own scope

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pcprogrammer:
True, but this means adding a DAC, and other logic to make it somewhat flexible to mimic like what can be done in software or a FPGA.

alm:
Yes, absolutely. I'm not saying it's an elegant solution, but it could help towards making a somewhat usable scope while avoiding using an fpga.

2N3055:

--- Quote from: alm on October 21, 2022, 09:31:24 am ---Yes, absolutely. I'm not saying it's an elegant solution, but it could help towards making a somewhat usable scope while avoiding using an fpga.

--- End quote ---
But you're missing the point.
A home made scope cannot be made to be better and cheaper than many ready made scopes on market.
So only reason why OP would choose to make a scope is a learning experience.

And if so, why he would learn how modern digital scope is NOT made..

A modern digital scope (all of them) have ADC /FPGA combination, minimum. Sometimes special ASICs to accelerate thing or provide some kind of real time capability that is too complicated or too fast for FPGA  They also have digital triggers implemented inside FPGA code as a part of acquisition engine. If they are USB scopes, then they have some sort of solution (also inside of FPGA or a separate CPU) to pump data to PC. Standalone scopes in addition to ADC/FPGA have their own CPU that runs GUI/analysis. Sometimes that CPU is inside FPGA (Zynq for instance). There are few nice scopes on market based on ADC(1 or 2) and Zync.

If he wants to learn sampling theory and DSP math, a sound card built in a PC and Octave (and hundreds of books) will provide lifelong fun and games..

tggzzz:

--- Quote from: rob77 on October 20, 2022, 11:58:07 pm ---
--- Quote from: tggzzz on October 20, 2022, 11:19:49 pm ---Probably, but omit the FPGA and have a FIFO that isn't tied to a communication device ;)

Cats? I know lots of ways to skin them  ;D

--- End quote ---

and how exactly would you connect it to the computer ?

--- End quote ---

Sigh. Why do people choose to omit context relevant to their point? Here's what I was replying to...


--- Quote from: rob77 on October 20, 2022, 10:17:18 pm ---isn't that exactly what the FPGA + USB fifo + OS device driver combo does ? ;)

--- End quote ---

Don't use the "USB fifo" as part of the scope's functionality.

balnazzar:

--- Quote from: gf on October 21, 2022, 05:17:07 am ---The low-cost Hantek 6022BE uses an EZ-USB microcontroller to stream the ADC samples via USB2 to the PC. No FPGA involved. Sample rate is 48MSa/s, IIRC. Processing (incl. trigger) is done on the PC.

--- End quote ---

If 48 MSa/s is the best one can do without FPGA, then FPGA is necessary.

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