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| Two Tone Test with Scope and SA |
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| tautech:
--- Quote from: mawyatt on August 01, 2020, 08:08:40 pm ---Agree, this SDS1104X-E looks really good even slightly better performance than the SDS2104X!! Amazing considering the price!! Best, --- End quote --- Siglent's do like a lot of waveforms displayed for FFT so the limits with low frequencies are at a firm 50ms/div when anything slower drops into Auto Roll mode. FFT Horizontal menu settings (Hz/div, Span) are also limited by timebase settings in SDS1104X-E so some small juggling act ensues to obtain best settings. Practice makes perfect. ;) Maybe I'll do a comparison between a few models at just one frequency squeezing the best I can outta each model. |
| mawyatt:
--- Quote from: tautech on August 01, 2020, 08:00:54 pm --- --- Quote from: 2N3055 on August 01, 2020, 07:48:15 pm --- --- Quote from: tautech on August 01, 2020, 07:41:41 pm ---The $499 SDS1104X-E....... ............... --- End quote --- That looks good! --- End quote --- They're as good as you drive them. ;) Rejected for posting as I didn't take enough time with the settings and particularly not a slow enough timebase: Compare with last above. The $379 SDS1202X-E will be next....when I get a chance. --- End quote --- Rob, The 1 and 4 markers should be on the two small tones on each side of the larger tones, they are spaced the delta frequency of the larger tones on each side. Since the two large tones are at 10.00MHz and 10.01MHz, delta F is then 0.01MHz (10KHz), then the 3rd Order IMD products are at 9.99MHz (2F1 -F2) and 10.01MHz (2F2-F1). This looks like these 3rd Order IMD products are over 65dB down (don't know how you squeeze this from an 8 bit converter, but your result show such!!), which is quite good indeed :-+ Nice work :clap: BTW can these results be brought into an app for a better resolution FFT display? Best, |
| tautech:
--- Quote from: mawyatt on August 01, 2020, 08:24:51 pm ---Rob, The 1 and 4 markers should be on the two small tones on each side of the larger tones, they are spaced the delta frequency of the larger tones on each side. Since the two large tones are at 10.00MHz and 10.01MHz, delta F is then 0.01MHz (10KHz), then the 3rd Order IMD products are at 9.99MHz (2F1 -F2) and 10.01MHz (2F2-F1). This looks like these 3rd Order IMD products are over 65dB down (don't know how you squeeze this from an 8 bit converter, but your result show such!!), which is quite good indeed :-+ Nice work :clap: --- End quote --- FYI nothing special was done with Markers in these shots other than select Peak which is why they are where they are. ;) We can select Frequency which will place them on the nearer tones or manually position them and select how many markers we wish to display. To date I've just let the Markers do their thing with just a Peak setting. This ^ applies to all Siglent models shown thus far. --- Quote ---BTW can these results be brought into an app for a better resolution FFT display? --- End quote --- Probably but beyond my pay grade and understanding. Most stuff can be exported as a CSV Save. We can however instead of using Split screen FFT use an Exclusive FFT mode and maybe I need drop a couple of shots in to show how different it looks. With models shown thus far we can also port to any size display we like using the Webserver feature via a LAN link to a PC. The LAN speeds on these are pretty quick however there is a wee latency when porting to another device. |
| mawyatt:
--- Quote from: tautech on August 01, 2020, 08:46:39 pm --- --- Quote from: mawyatt on August 01, 2020, 08:24:51 pm ---Rob, The 1 and 4 markers should be on the two small tones on each side of the larger tones, they are spaced the delta frequency of the larger tones on each side. Since the two large tones are at 10.00MHz and 10.01MHz, delta F is then 0.01MHz (10KHz), then the 3rd Order IMD products are at 9.99MHz (2F1 -F2) and 10.01MHz (2F2-F1). This looks like these 3rd Order IMD products are over 65dB down (don't know how you squeeze this from an 8 bit converter, but your result show such!!), which is quite good indeed :-+ Nice work :clap: --- End quote --- FYI nothing special was done with Markers in these shots other than select Peak which is why they are where they are. ;) We can select Frequency which will place them on the nearer tones or manually position them and select how many markers we wish to display. To date I've just let the Markers do their thing with just a Peak setting. This ^ applies to all Siglent models shown thus far. --- End quote --- On most systems the closer small 3rd Order IMD tones are more dominate than the ones father out as things begin to roll off as you move away from the dominate 2 tones. This appears to be a little different, either case it's really good performance!! Yes, a single screen image of the FFT would show better. The TD display doesn't shown much as we've seen (all look almost exactly alike) and why this 2 tone test shows more on what's going on within the scope under test regarding DR. I'm already sold but others may benefit form this. Best, |
| tautech:
--- Quote from: mawyatt on August 01, 2020, 09:59:43 pm --- --- Quote from: tautech on August 01, 2020, 08:46:39 pm --- --- Quote from: mawyatt on August 01, 2020, 08:24:51 pm ---Rob, The 1 and 4 markers should be on the two small tones on each side of the larger tones, they are spaced the delta frequency of the larger tones on each side. Since the two large tones are at 10.00MHz and 10.01MHz, delta F is then 0.01MHz (10KHz), then the 3rd Order IMD products are at 9.99MHz (2F1 -F2) and 10.01MHz (2F2-F1). This looks like these 3rd Order IMD products are over 65dB down (don't know how you squeeze this from an 8 bit converter, but your result show such!!), which is quite good indeed :-+ Nice work :clap: --- End quote --- FYI nothing special was done with Markers in these shots other than select Peak which is why they are where they are. ;) We can select Frequency which will place them on the nearer tones or manually position them and select how many markers we wish to display. To date I've just let the Markers do their thing with just a Peak setting. This ^ applies to all Siglent models shown thus far. --- End quote --- On most systems the closer small 3rd Order IMD tones are more dominate than the ones father out as things begin to roll off as you move away from the dominate 2 tones. This appears to be a little different, either case it's really good performance!! Yes, a single screen image of the FFT would show better. The TD display doesn't shown much as we've seen (all look almost exactly alike) and why this 2 tone test shows more on what's going on within the scope under test regarding DR. I'm already sold but others may benefit form this. Best, --- End quote --- Another point of reference when you asked about better resolution. Well of course if we know the fundamentals are where they should be we can go chasing more resolution with a different Ref position and increased vertical scaling. Here I've selected a full screen display that still shows the source waveform yet if that's not required we can select exclusive FFT, neither of which are hamstrung for resolution like the SDS1104X-E 50/50 split display. |
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