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Pocket-Sized 6 GHz 1 TS/s ET Scope

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joeqsmith:

--- Quote from: SJL-Instruments on January 08, 2024, 09:51:33 pm ---If you decide to go down the analog delay line route, 12ft of LMR-600 cable will generate a 14ns delay with ~1 dB loss @ 6 GHz. This may be an acceptable level of degradation for some applications.

--- End quote ---

Plus an additional 6dB for the splitter and possible other attenuators.  I think this is how I would proceed, at least for the cases we are talking about. 

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Maybe add another 13-14dB to make the math work out to a nice /10.  I don't remember if your software supports any divider ratio like my other scopes offer.   If not, you may want to consider adding it.   Then having a way to compensate for the added delay to fudge the T0.  Basically getting me a time marker based on the added delay for the trigger shown on the graph. 

SJL-Instruments:
Yes, you can enter an arbitrary probe attenuation. And now that you mention it, it might be useful to let the user specify it in dB as well.
We'll add that and the extra timebase delay option to the next update.

edit: Implemented as of 2024-01-11.

Marco:

--- Quote from: SJL-Instruments on January 08, 2024, 09:26:15 pm ---trying to delay the analog waveform itself is not possible without distortion, and we don't recommend it.

--- End quote ---
Do you have a measurement mode for signals with unknown jitter? The search approach is slow to begin with, trying to determine a signal range rather than level will do it no favours. An advantage for instantaneous sampling.

The output of a triggered sparkgap will jitter, so I was suggesting on triggering on the attentuated output and delaying the same output. Linear distortion can be corrected for.

SJL-Instruments:
There isn’t a way to stabilize a signal with unknown jitter relative to trigger - this is unfortunately an architecture limitation, as you mentioned.

Yes, triggering off the waveform itself and viewing a delayed copy will work. If the waveform is reproducible enough (w.r.t. trigger point) to give a clean, single-valued trace, you can undo the signal distortion if you know the transfer function of the delay line.

If the variation is significant, however, there is no way in general to accurately undo the distortion given only the probability density of the waveform.

joeqsmith:

--- Quote from: SJL-Instruments on January 08, 2024, 10:50:16 pm ---Yes, you can enter an arbitrary probe attenuation. And now that you mention it, it might be useful to let the user specify it in dB as well.
We'll add that and the extra timebase delay option to the next update.

--- End quote ---

Thanks.  These features should prove useful.

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