Products > Test Equipment
Pocket-Sized 6 GHz 1 TS/s ET Scope
joeqsmith:
--- Quote from: Marco on January 08, 2024, 05:02:30 pm ---
--- Quote from: joeqsmith on January 07, 2024, 09:29:32 pm ---Normally, like with an ignition signal, there is no good way to create a pretrigger
--- End quote ---
A comparator and 5 meters of coax.
--- End quote ---
Delaying the drive signal to the coil's primary using coax may be an option, assuming it doesn't cause problems with any of the EMCs fault detection. You may be able to do something similar for other signals as well. Say a simple digital gate. You could have two probes attached to the source with different lengths of coax to derive the pre-trigger. In some cases loading of a single probe may be bad enough and now we compound that problem. Not to mention messing with the signal we are trying to measure. It's just not something I have ever thought about (needing a pre-trigger).
If I just wanted to say look at that vintage Tektronix pulser, I'm sure I could do that but it is hardly justification for purchasing such an instrument.
Of course it could be used to look at high frequency oscillators where the signal is stable enough. Then use the delay to see what is going on. Still, not very useful as I would normally want phase information and other details for a clock.
If probing a custom circuit, maybe you could create a separate pre-trigger to keep it isolated from the signal you are wanting to measure. You would need to consider it in the design phase.
--- Quote from: SJL-Instruments on January 08, 2024, 12:54:26 am ---
--- Quote ---I am surprised by your 20 page manual. The software shown in that video not a commercial application and is offered free of charge with a 200 page manual.
--- End quote ---
Yes, our software does not have nearly as many features as LeCroy's. We are actively working to improve it, but do not have the resources of a large company. One of the motivations for this forum post is to get feedback on which features we should prioritize.
(On the flip side, we would argue that our software has little to no learning curve, for precisely this reason.)
--- End quote ---
Agree, that 40+ year old LeCroy DSO does offer some very nice features not found on even modern products. But the point I was trying to make is the software and manual mentioned was created by one person. Well, then there are the countless papers published by the leaders of the industry. I give them credit for all of my math.
joeqsmith:
Another possible low cost sampling scope. $1000USD 11GHz.
https://www.fastsampling.com/
An old kick start from 10 years back:
https://www.kickstarter.com/projects/1855991221/10-ghz-usb-oscilloscope
Thinking about the coax delay line, using a resistive splitter and maybe a couple of attenuators to help with the matching/isolation. Still, you are giving up a lot.
https://www.eevblog.com/forum/testgear/most-affordable-way-to-get-a-really-fast-oscilloscope/
SJL-Instruments:
--- Quote ---Agree, that 40+ year old LeCroy DSO does offer some very nice features not found on even modern products. But the point I was trying to make is the software and manual mentioned was created by one person. Well, then there are the countless papers published by the leaders of the industry. I give them credit for all of my math.
--- End quote ---
Apologies, we misread and thought you were referring to LeCroy's software. Yes, Solver is impressive work (and I have personally used it - thank you for developing it).
That said, our software has been around for 1/10 as long as solver. At this stage, our users have a lot of say in what features get implemented first, so we really do value your feedback.
--- Quote ---Delaying the drive signal to the coil's primary using coax may be an option, assuming it doesn't cause problems with any of the EMCs fault detection. You may be able to do something similar for other signals as well. Say a simple digital gate. You could have two probes attached to the source with different lengths of coax to derive the pre-trigger. In some cases loading of a single probe may be bad enough and now we compound that problem. Not to mention messing with the signal we are trying to measure. It's just not something I have ever thought about (needing a pre-trigger).
--- End quote ---
Delaying the trigger to the DUT works great (when possible). In our experience, trying to delay the analog waveform itself is not possible without distortion, and we don't recommend it.
joeqsmith:
They talk about using the delay line for a pre-trigger in their manual:
https://www.fastsampling.com/Products/DS800E/DS800Manual17.pdf
Makes sense but at a cost..
SJL-Instruments:
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.
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