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Show us your square wave
ADT123:
Richard - I designed most of the real time scopes with a parallel port starting with the ADC-10 in 1991 and hung up my soldering iron around 2001 with the ADC212/100 which included repetitive ETS sampling (https://www.picotech.com/about/history).
As for a lower cost / lower bandwidth sampling scope its an interesting idea. Above a few GHz every component gets expensive if you want to do the job properly (connectors, PCB etc) but below say 5GHz things get a lot cheaper. Will have a think. Guess it depends on the market - hobby users often go for 2nd hand boat anchors which can be cheap and to be honest not everyone knows how to drive a sampling scope (splitters for trigger signals etc).
10/90 vs 20/80 rise time - thats a fair cop. I just borrowed a waveform so when I get a chance will see if I can do better.
pigrew:
Tabor 8025, programmed to be 1Vpp, 50 MHz, 50 ohm terminated. 10%/90% rise time is 5.2ns, fall is 4.65ns.
ADT123:
10/90 rise time (see comment from Electro Fan a couple of posts again). Scope rise time is 14ps, pulse rise time is 10ps. Combined gives 18.74ps.
Please dont try to beat this - not sure I can respond with anything faster!
MrW0lf:
Noticed that on last Pico screenshot sampling rate is mere 10TSa/s, while on previous 16TSa/s ::) But guess both are adequate being "slightly" over Nyquist :P
Electro Fan:
--- Quote from: ADT123 on May 02, 2017, 07:25:38 am ---10/90 rise time (see comment from Electro Fan a couple of posts again). Scope rise time is 14ps, pulse rise time is 10ps. Combined gives 18.74ps.
Please dont try to beat this - not sure I can respond with anything faster!
--- End quote ---
It is very competitive with the best rise time we have previously seen (~16ps by EV):
https://www.eevblog.com/forum/testgear/40-ps-rise-time/msg935446/#msg935446
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