Products > Test Equipment
SDS800X HD Actual Use Cases
tszaboo:
--- Quote from: mawyatt on May 03, 2024, 03:47:36 pm ---Would expect so, as it's already been shown how to make Impedance and Admittance measurements utilizing the Bode Function.
Best,
--- End quote ---
I've been thinking about a PDN measurement for a while with this scope. I think a low output resistance preamp would be needed for it. And a DC block. And a preamplifier with specific input impedances. And some way to calibrate the whole system. And some script to de-embed the results from the measurements. It's not going to be easy.
It's also kind of difficult to use the results. They would be limited to ~200MHz. Systems that define PDN impedances are typically high speed digital, where wider band measurements would be needed. Of course you can connect it to the Arduino and show that it's a bad design, but what is the design requirement for a microcontroller like that?
joeqsmith:
I had made up some standards down to 100uohms. The NanoVNA just doesn't have good enough performance to resolve it. Still, $50.
I think I documented everything if you go to my dropbox and select the NanoVNA directory, you will find the software users manual.
One problem with the NanoVNA when making these measurements is you really have to slow things down. It seems like a sweep would take me several minutes to run. The other problem is it was limited to about 50kHz. You could run it lower with different firmware but the performance was too poor to be useful.
If you are looking for actual use cases as your thread suggests, and want to try it out, I'm interested to see this measurement with the Siglent. You may have to write some software to do it, but then again, wouldn't be surprised if it didn't already have it.
***
I did make a video demonstrating the basics and goes over some of the problems. Also shows using the software to tame a PDN. The three hurdles with that whole setup were breaking the ground loop, blocking the DC and standards to verify performance.
mawyatt:
--- Quote from: tszaboo on May 03, 2024, 04:09:48 pm ---
--- Quote from: mawyatt on May 03, 2024, 03:47:36 pm ---Would expect so, as it's already been shown how to make Impedance and Admittance measurements utilizing the Bode Function.
Best,
--- End quote ---
I've been thinking about a PDN measurement for a while with this scope. I think a low output resistance preamp would be needed for it. And a DC block. And a preamplifier with specific input impedances. And some way to calibrate the whole system. And some script to de-embed the results from the measurements. It's not going to be easy.
It's also kind of difficult to use the results. They would be limited to ~200MHz. Systems that define PDN impedances are typically high speed digital, where wider band measurements would be needed. Of course you can connect it to the Arduino and show that it's a bad design, but what is the design requirement for a microcontroller like that?
--- End quote ---
At present the upper end is limited to 120MHz, maybe Siglent can extend this if the AWG is capable (SDG6000X for example).
Here's a couple links showing the Bode Function involving Injection Locking, which shows how well the selectivity of the Synchronous Sampling/Detection or whatever algorithm Siglent has utilized behaves. Impressive IMO and could benefit other uses where large interference is present.
https://www.eevblog.com/forum/testgear/siglent-sds800x-hd-12-bit-dsos-coming/msg5441336/#msg5441336
https://www.eevblog.com/forum/projects/injection-locked-peltz-oscillator-with-bode-analysis/
Best recommendation we can provide is get one and play around, you can always return it, however we'll wager you'll keep it and it will put a grin on your face as well :-+
We are a very well seasoned semi-retired research scientist/engineer with a fairly extensive background. Grew up with nothing put HP/AG/KS and Tek equipment over the years, so it takes quite an instrument to impress us, the SDS800X HD has succeeded admirably!! We have a DHO814 as well, it's impressive and quite a good little DSO, but the SDS is just better is almost every way and much more "Pro Like".
Best,
joeqsmith:
Plan to buy a new low end one at some point just to try out. The 800 has a smaller display than my tablet. It's difficult anymore to see these small screens without glasses. Doesn't appear the 800 supports an external monitor as well. Does look like a nice scope otherwise and it's certainly affordable.
mawyatt:
--- Quote from: joeqsmith on May 03, 2024, 04:13:43 pm ---I had made up some standards down to 100uohms. The NanoVNA just doesn't have good enough performance to resolve it. Still, $50.
I think I documented everything if you go to my dropbox and select the NanoVNA directory, you will find the software users manual.
One problem with the NanoVNA when making these measurements is you really have to slow things down. It seems like a sweep would take me several minutes to run. The other problem is it was limited to about 50kHz. You could run it lower with different firmware but the performance was too poor to be useful.
If you are looking for actual use cases as your thread suggests, and want to try it out, I'm interested to see this measurement with the Siglent. You may have to write some software to do it, but then again, wouldn't be surprised if it didn't already have it.
***
I did make a video demonstrating the basics and goes over some of the problems. Also shows using the software to tame a PDN. The three hurdles with that whole setup were breaking the ground loop, blocking the DC and standards to verify performance.
--- End quote ---
That looks like an interesting project, however software isn't our bag. Also seems this will likely get quite involved, so we'll let others more capable than ourselves tackle this.
Maybe you might consider acquiring a SD800X HD, doubt you'll be dissapoined :-+
Best,
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