Products > Test Equipment

Pocket-Sized 6 GHz 1 TS/s ET Scope

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points2:

--- Quote from: joeqsmith on January 18, 2024, 03:46:22 am ---Checked your specified rise time.  35 and change, pretty impressive.  Plan is to run this through that coax filter and see if you can de-embed it. 

--- End quote ---
It looks like you appreciate this device  :-+

Apart from your exchange with SJL vs high level stuff (please go on, it is usefull whatever our level in the field)
=> what's your feedback about the perf of the GigaWave you got (2/4/8 CH ?)

I'm on the waiting list... waiting for EU approval  8)

luudee:

So if you do 1 Tsample/s at 12 bits, thats 12 Tbits/sec ?!  How do you transfer that over a 40 gb/s USB ?!

rudi

Berni:

--- Quote from: luudee on January 18, 2024, 05:55:53 am ---
So if you do 1 Tsample/s at 12 bits, thats 12 Tbits/sec ?!  How do you transfer that over a 40 gb/s USB ?!

rudi

--- End quote ---

1 TS/s refers to the timing resolution of the reconstructed waveform. To be fair these are sort of meaningless numbers once you get to timing resolutions this high, the 6GHz bandwidth is the impressive part.

Actual sample rate is 25MS/s since this is a sampling scope, not a real time scope.

SJL-Instruments:

--- Quote from: joeqsmith on January 18, 2024, 03:46:22 am ---Checked your specified rise time.  35 and change, pretty impressive.  Plan is to run this through that coax filter and see if you can de-embed it. 

https://www.eevblog.com/forum/testgear/show-us-your-square-wave/msg5284957/#msg5284957


--- End quote ---
Thanks! Yep, the typical rise time on the datasheet is conservative.

S-parameter import is working with live de-embedding in the software. UI still in progress (we'd like to show the reconstructed step response, display the calculated the system risetime, etc), but at its core you just click "de-embed" and import an s2p file. Should be out by Sunday.


--- Quote from: Berni on January 18, 2024, 06:56:18 am ---1 TS/s refers to the timing resolution of the reconstructed waveform. To be fair these are sort of meaningless numbers once you get to timing resolutions this high, the 6GHz bandwidth is the impressive part.

Actual sample rate is 25MS/s since this is a sampling scope, not a real time scope.

--- End quote ---
We would say that 1 TS/s is "overkill" for 6 GHz, but not meaningless. The device can physically take samples with sub-ps average timing reproducibility. This is important in sampling oscilloscopes, where in general sinc interpolation is not possible (for multi-valued signals) and you cannot Nyquist your way into higher displayed timing precision.

But as you said, at some point bandwidth is bandwidth and you can't de-embed your way into creating bandwidth where it doesn't exist.  :)

Max trigger rate is 25 Mtrig/s (limited only by min 40 ns holdoff), but this is not a "sample rate" in the way you're used to (we have a unique architecture). 4 MSa/s is a rough conversion, but see Section 2.1.2 "CDF Sampling" in the manual for details:
https://www.sjl-instruments.com/user-manual.pdf

joeqsmith:

--- Quote from: points2 on January 18, 2024, 04:07:03 am ---
--- Quote from: joeqsmith on January 18, 2024, 03:46:22 am ---Checked your specified rise time.  35 and change, pretty impressive.  Plan is to run this through that coax filter and see if you can de-embed it. 

--- End quote ---
It looks like you appreciate this device  :-+

Apart from your exchange with SJL vs high level stuff (please go on, it is usefull whatever our level in the field)
=> what's your feedback about the perf of the GigaWave you got (2/4/8 CH ?)

I'm on the waiting list... waiting for EU approval  8)

--- End quote ---



--- Quote from: points2 on January 06, 2024, 11:04:18 pm ---you said earlier : Shahriar's review is queuing... and we reveiw is expected in "a while"
Speed up the process and send your product to any guys (many experts, with many posts & high reliability) in this forum. Pretty sure sure they will do a far better review than Shahriar, because quick & relevant vs the potential of your device for hobbyist.
Don't get me wrong, Shahriar reviews are 1st-class... but it's all about "pro" stuff @ price tag way above the hobbyist budget (see its last videos) ; but any hobyist can learn form him, and that's ok.
All  the best  :-+

--- End quote ---

It seems they took your comment to heart as SJL provided me with one of the early 4 channel DSOs to review.  You can see a photo of it in the previous link I provided where I measured a pulse to check the performance.  I have been working on putting together a video, which is what is driving the dialog here.   

Once I have the delay line assembled and characterized, and the software adds support to de-embed, I can start trying some other tests.  There are other features I would like to see added to the software before getting into it too deep.    Someone asked about stability of the edge over time for example.  There's not a good way to do this today but it is one of the things I had requested they add.   Of course, there is always the option to write custom code to run some of these experiments as well, but I would rather utilize their software. 

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