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Pocket-Sized 6 GHz 1 TS/s ET Scope

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joeqsmith:

--- Quote from: SJL-Instruments on January 18, 2024, 01:25:31 pm ---
--- 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.

--- End quote ---

Fantastic.  I should have everything ready to go by then.   For the Tr, that coax isn't doing it any favors.

***
Are you planning to allow one Touchstone file for each channel?   For the coax model, did you allow to enter a single value for the insertion loss?   

Are you going to support a variable gain rather than just having it fixed? 

SJL-Instruments:

--- Quote from: joeqsmith on January 18, 2024, 02:13:42 pm ---Are you planning to allow one Touchstone file for each channel?   For the coax model, did you allow to enter a single value for the insertion loss?

--- End quote ---
The de-embedding settings will be independent for each channel (i.e. yes, you can have different Touchstone files for every channel). You will be able to either import s-parameters, or specify the list of everything (coax cables, splitters, attenuators, etc) in the chain. Coax cables will have a parameter for insertion loss, and you can specify multiple cables between DUT and scope.


--- Quote from: joeqsmith on January 18, 2024, 02:13:42 pm ---Are you going to support a variable gain rather than just having it fixed? 

--- End quote ---
Could you clarify what you mean? For splitters/attenuators/cable insertion loss/etc you will be able to enter in the loss in dB.

joeqsmith:
De-embed sounds perfect. 

As the setup gets more complex, having a way to save all the settings (including the links to the Touchstone files) becomes more important. 

If you get everything done on the list and are looking for something to add,  please consider some sort of auto edge search.  The software would start with some defined sweep range, using very low resolution, search for a edge.  Center around that and increase the resolution.   Maybe you could also support searching for the highest or lowest peak.  Other?  It's a bit of a pain to hunt down signals.  I set the samples to 4 with several ns per division, find what I want, drag it to the center, manually zoom in a bit, fine tune the center, rinse and repeat until I get what I want.   Having a way to automate this would be handy IMO. 


--- Quote from: SJL-Instruments on January 18, 2024, 04:36:09 pm ---Could you clarify what you mean? For splitters/attenuators/cable insertion loss/etc you will be able to enter in the loss in dB.

--- End quote ---

As far as I know, your software only allows a fixed volts per division for the vertical axis.  I want to be able to set this to what ever I want.  I will use this with my scopes to make better use of the plot area or overlay different channels that have signals with different gains.  Once we moved away from mechanical clunky rotary switches,  I suspect most DSOs supported this.   

joeqsmith:
With LabView sorted, I can have a look at temperature drift.  Manual states 50C operating...

SJL-Instruments:

--- Quote from: joeqsmith on January 18, 2024, 05:39:02 pm ---As the setup gets more complex, having a way to save all the settings (including the links to the Touchstone files) becomes more important. 

--- End quote ---
Yep, this should hopefully come out in the next update (together with waveform save/recall).
This has been implemented in v2.5.5 (released 2024-01-21).


--- Quote from: joeqsmith on January 18, 2024, 05:39:02 pm ---If you get everything done on the list and are looking for something to add,  please consider some sort of auto edge search.  The software would start with some defined sweep range, using very low resolution, search for a edge.  Center around that and increase the resolution.   Maybe you could also support searching for the highest or lowest peak.  Other?  It's a bit of a pain to hunt down signals.  I set the samples to 4 with several ns per division, find what I want, drag it to the center, manually zoom in a bit, fine tune the center, rinse and repeat until I get what I want.   Having a way to automate this would be handy IMO. 

--- End quote ---
Got it - added to the list. The UI for this needs some careful thought.


--- Quote from: joeqsmith on January 19, 2024, 02:08:56 am ---As far as I know, your software only allows a fixed volts per division for the vertical axis.  I want to be able to set this to what ever I want.  I will use this with my scopes to make better use of the plot area or overlay different channels that have signals with different gains.  Once we moved away from mechanical clunky rotary switches,  I suspect most DSOs supported this.   

--- End quote ---
Thanks for the clarification. We'll probably implement this by changing the dropdown into a textbox when the advanced settings panel is opened. Using the scroll wheel on the channel marker will snap to the nearest predefined value (if a custom value was entered). What are your thoughts on this?


--- Quote from: joeqsmith on January 19, 2024, 02:08:56 am ---With LabView sorted, I can have a look at temperature drift.  Manual states 50C operating...

--- End quote ---
Looking forward to seeing your results.

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