| Products > Test Equipment |
| Siglent - 11/20 - New SDS1104X-U, 4 channel 100MHz, 1Gsa/s economy oscilloscope |
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| 2N3055:
--- Quote from: Mechatrommer on November 29, 2020, 03:04:22 pm --- --- Quote from: nctnico on November 29, 2020, 02:38:01 pm --- --- Quote from: Mechatrommer on November 29, 2020, 02:29:51 pm ---just to be clear, if you want this FFT buzz, just buy a proper Spectrum Analyzer, those 1Mpts DSPed scope will become obsolete quick. --- End quote --- No. Because a spectrum analyser doesn't go to near DC frequencies. Also the frequency resolution of 1Mpts FFT will beat a spectrum analyser hands down at low frequencies. --- End quote --- whats the point if it can have leakage in 500Hz bin? anyway, 1Mpts FFT is not something unsolvable in 1kZ+PC. whats no working solution so far (afaik) is 10Mpts FFT Siglent DSO (even +PC). ps: those who are not aware the deeper details of FFT yet, we cant just use all 17Mpts and expect to get 8.5Mpts FFT, it will take ages to compute O(N^2) of simple "any size" FFT algorithm, we'll need O(N.log(N)) such as DIT or KISS FFT, but that need only of size N=2^y (y must be integer) so your 17Mpts must be downgraded to maybe like 10Mpts data in time domain, hence you'll only get 5Mpts FFT. with 24Mpts data, it will downgraded to 20Mpts, hence we can have 10Mpts FFT (50Hz bin instead of 100Hz bin in 5Mpts FFT). fwiw. --- End quote --- And if you just paste plots from LTSpice, you don't need scope at all... Stop trolling about what analysis you can do on PC in a topic about oscilloscopes. Did you know Rigol DS1054Z can also fly? You just have to put on an airplane... Let see if other manufacturer's scopes can do that!! As Nico nicely says, there is a point of diminishing returns for everything. FFT on scope needs lot of points if you want high frequency resolution AND high maximum frequency at the same time. If you're looking at the frequencies of up to, let's say 100kHz, 64kpoints is a lots of resolution: at 200 KSPS/s, with 64kpoints you get 32kbins, that gives you resolution of 3 Hz per bin. Problem is with higher frequencies: with 16 MHz bandwidth (32MSps/s) same 64k points will get 476,8 Khz per bin. So if you want better RBW to look at 10.7 MHz filter, you need to bump u FFT points to more: 2 MPoints will give 1 Mbins, and you get 14.9 Hz per bin.. 1 MPoints will give 512 kbins, and you get 30 Hz per bin.. Point is, SA shines with MHz frequencies and up, because of constant RBW, because it uses downconversion. At lower frequencies, FFT will get better results and will have instantaneous full real time bandwidth for whole measured frequency interval. At audio frequencies, even 128k Points will achieve impressive resolution, more than enough to tune and verify any audio filter made with real life components. 1MPoint extends that to little bit higher frequencies, so it is quite useful to some 10s of MHz. For serious work in MHZ and up region, you need SA, like Mechatrommer says. 8 bit scopes might have RBW good enough to look at the things, but they won't have dynamic range of a SA. For low frequencies, you need high res scope or audio or some kind of specialized analyser... |
| Fungus:
--- Quote from: rf-loop on November 29, 2020, 03:37:13 pm ---This is from 1000X-E/X-U manual. Just tiny sample. Of course there is markers and table and so on. But if you read 1000X series manual... its your problem. --- End quote --- Fair enough, posts removed. |
| Mechatrommer:
--- Quote from: 2N3055 on November 29, 2020, 03:39:57 pm ---And if you just paste plots from LTSpice, you don't need scope at all... Stop trolling about what analysis you can do on PC in a topic about oscilloscopes. Did you know Rigol DS1054Z can also fly? --- End quote --- thinking about it... you are right! the decision to put ethernet connectivity (and errr, USB port too) in Siglent tools is just nonsensical. lets just use it as is, can i suggest built-in DMM? and Quake too? |
| 2N3055:
--- Quote from: Mechatrommer on November 29, 2020, 04:19:07 pm --- --- Quote from: 2N3055 on November 29, 2020, 03:39:57 pm ---And if you just paste plots from LTSpice, you don't need scope at all... Stop trolling about what analysis you can do on PC in a topic about oscilloscopes. Did you know Rigol DS1054Z can also fly? --- End quote --- thinking about it... you are right! the decision to put ethernet port in Siglent tools is just nonsensical. --- End quote --- WTF is wrong with you? Stop trolling. It is sad thing that you have nothing better to do, when I, for sure, know you have lot of knowledge and could actually make very intelligent and useful comments? What do you figure, I'm Rigol or Siglent fanboy? Or Keysight, or Micsig, or Metrix, or Brymen, or TTi, or Picoscope, or Signal Hound, or Maynuo, or AOIP, or what... I have all of those and all that equipment is both awesome at some things and suck at others ... I had DS1074Z before, and loved it for what it was, well worth of money in 2016 when I bought it. It paid of in few weeks, and was very useful little thing. I also never really felt it was slow like some other people were complaining. 4 years passed, and things have changed. There are better options today, and if you absolutely have to chose based on price alone, still solid choice. I would not say to somebody that buys it today that they made a mistake. Still worth the money. But at this moment, with GDS1054B you get better scope, with SDS1104X-U you get better scope, with Micsig you get highly portable scope that is also very nice and also have some things and miss some other. With SDS1104X-E much better scope that has 2 A/D converters and lot of other stuff that you need to upgrade to GW Instek GDS2000E series to get. In my opinion GDS2000E series is much better scope than SDS1000X-E series, but GDS2000E is starting to get into price range of SDS2000X+ which wins with bigger screen.... Never ending story... Your mileage may vary. Sorry if that insults your precious and tender feelings you have for your DS1054Z connected to PC. But you'll have to sort that out with your therapist. Leave me out of your struggle with that...Please. EDIT: REMOVED P.S. |
| nctnico:
--- Quote from: Mechatrommer on November 29, 2020, 04:25:36 pm --- --- Quote from: 2N3055 on November 29, 2020, 03:39:57 pm ---And if you just paste plots from LTSpice, you don't need scope at all... Stop trolling about what analysis you can do on PC in a topic about oscilloscopes. Did you know Rigol DS1054Z can also fly? --- End quote --- thinking about it... you are right! the decision to put ethernet connectivity (and errr, USB port too) in Siglent tools is just nonsensical. lets just use it as is, can i suggest built-in DMM? and Quake too? --- End quote --- But the fact still remains that it is easier if a device can perform the functions by itself. That you don't need to bring / install software on a PC before you can do something. On a PC the update rate will always be slower due to data transfer and the integration of on-screen measurements the oscilloscope brings is gone. It is like driving one car with two steering wheels. Doable for sure but not ideal. If your goal is to use a PC for analysis then a Picoscope is a much better choice anyway |
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