Products > Test Equipment
Pocket-Sized 6 GHz 1 TS/s ET Scope
JohnG:
FWIW, I have the 11 GHz scope from fastsampling.com (2 actually, but one has an problem). I find it difficult to use, mainly because of the software. I am not sure if they are still in business, as the last time I tried to contact them, I got no reply. The two channel limitation and the cumbersome software has made it difficult to use for my needs.
The ability to control the software, and hopefully extract data through the same, is a requirement.
FWIW, I used an analog delay with it as mentioned above. It works, but it is not so easy to correct for cable losses due to "dribble-up". Part of the problem is that the frequency response of a lossy practical transmission line are not represented by a finite rational function, because the losses are due to eddy currents. There are some ways around this, i.e. de-embedding, but this is not trivial.
Come to think of it, that would be a mighty fine feature for the software:).
John
joeqsmith:
I wondered if they were still in business. You can download the SJL's software and run it in demo mode to get a feel for it. I have not looked at Fastsampling's software but from your post, you my find SJL's on the opposite end of the spectrum.
For your scope:
--- Quote ---If bandwidth required does not excide 4GHz then input connection can be simplified and trigger input
power divider can be used.
--- End quote ---
They go onto talk about the 4' or more of coax. Indeed, there may be a way to characterize it and back it out. Have you dug into the math? If so, can you provide any details?
***
I did find this article:
https://www.edn.com/rescaling-oscilloscope-signals-and-de-embedding-cables/
SLJ, have you considered creating a software interface document for the product that would provide details on how to directly control it?
hpw:
--- Quote from: SJL-Instruments on January 05, 2024, 05:57:56 pm ---Pretty close, yes! Attached is a picture of the RF side of the board if you'd like to take a stab at it.
--- End quote ---
Did run your demo, as all are stable signals... as I like to trigger a LVCMOS edge and analyze the variations of like 20%..80% rise time over time as also some Chatter.
Is this picture below in red the time base oscillator??
Hp
SJL-Instruments:
Yes, that is the reference timebase (2.5 ppm TCXO).
20-80% risetime is available as a built-in measurement. It is possible to track the long-timescale variation of the risetime, but not the short-timescale fluctuations, since each sweep takes a few seconds.
For 3.3V LVCMOS signals we recommend a 12 dB inline attenuator with x4 probe attenuation in the software.
JohnG:
--- Quote from: joeqsmith on January 09, 2024, 04:26:01 pm ---They go onto talk about the 4' or more of coax. Indeed, there may be a way to characterize it and back it out. Have you dug into the math? If so, can you provide any details?
--- End quote ---
I have not done the math. I solved my issues well enough by getting a lower loss cable, but in the end I would have preferred to do some de-embedding. Since most de-embedding tools look for s-parameter models of the network to be de-embedding, I imagine that the process involves an FFT to convert the signal to be corrected into the frequency domain, passing it through some sort of inverse of the supplied model, and converting back to the time domain. My math skills are pretty rusty at this point.
Maybe this is an answer: https://github.com/TeledyneLeCroy/SignalIntegrity/wiki
John
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