Products > Test Equipment
buy a better oscilloscope than the Siglent SDS1104X-E
Martin72:
Hm ?
--- Quote --- ( better even than the $4,600 12-bit 350Mhz SDS2354X HD which has 70uVrms)
--- End quote ---
That´s what you´ve wrote, I don´t know from which datasheet you got this information because it´s 65µVrms.
You asked me where I have this information, I´ve posted a snip from the datasheet.
--- Quote ---the capture that you have put is at 50 ohm, of the SDS2104X HD model,
--- End quote ---
No Sir, the SDS2104X HD have 50µVrms, look again..
2N3055:
--- Quote from: uargo on August 19, 2023, 04:01:32 pm ---
--- Quote from: Martin72 on August 18, 2023, 10:02:36 pm ---
--- Quote --- better even than the $4,600 12-bit 350Mhz SDS2354X HD which has 70uVrms
--- End quote ---
65µVrms, look at the datasheet.
And: Noise rises more or less with the bandwith.
Plus: The difference between 56µVrms and 65µVrms is....nothing.
Plus, the second: You already have a SDS1104X-E, so you can measure it in real and now. ;)
At the moment I let the SDS1104X-E warm up for it...
--- End quote ---
I put a link to the siglent document that supports what I say, can you do the same, please
--- End quote ---
250 µV stdev is absolute limit (above which it is broken) for a 2CH model.
For 4ch model, at 1mV/div spec is "better than 25,55 dB SNR". There is formula below how it is calculated..
Which would be arround 150 µV stdev MAX. For it to be considered damaged....
Real noise will be half or better than that.
Martin posted real measurements from the scope...
Performa01:
The noise of a DSO has been debated at all times and one of the earliest occasions where the Siglent SDS1104X-E has been looked at has been back in February 2018, when our fellow "Master of Noise", @maxwell3e10, had a look at the cheapest 12 bit scope, an Owon XDS3062A:
https://www.eevblog.com/forum/testgear/owon-xds3062a-input-noise-(good)-and-glitches-(bad)/msg1429292/#msg1429292
He posted a table showing the noise levels of all the scopes he had tested at that time and unsurprisingly the 12bit Owon won - particularly at lower sensitivities, where the granular ADC noise is the main contribution to the total noise.
You can see Tektronix being the king of noise, but also that a 12 bit ADC can be not much more than a marketing gag, if it is not properly calibrated and has high nonlinearities (take a close look at the 2nd screenshot in that post).
My measurements back then, including noise spectra:
https://www.eevblog.com/forum/testgear/owon-xds3062a-input-noise-(good)-and-glitches-(bad)/msg1432960/#msg1432960
Here we got an updated table (shortened version, quite obviously, nobody wanted to see the noisy Tek anymore):
https://www.eevblog.com/forum/testgear/owon-xds3062a-input-noise-(good)-and-glitches-(bad)/msg1433124/#msg1433124
And finally the spectral noise density for full BW as well as 20 MHz bandwidth:
https://www.eevblog.com/forum/testgear/owon-xds3062a-input-noise-(good)-and-glitches-(bad)/msg1433850/#msg1433850
EDIT: Oh - and have you noticed how nobody wanted to share data of the Rigol 1054Z, even though it was the most popular scope at that time? I guess I know the reason why... ;)
MarioBros69:
From someone with very little knowledge on these issues..., is the Siglent SDS1104X-E better than the Siglent SDS2202X-E 200MHz?
There is very little difference in price, but which one is more worth it?
tautech:
--- Quote from: MarioBros69 on August 20, 2023, 11:05:49 am ---From someone with very little knowledge on these issues..., is the Siglent SDS1104X-E better than the Siglent SDS2202X-E 200MHz?
There is very little difference in price, but which one is more worth it?
--- End quote ---
If you need the BW SDS2202X-E everyday as it is a 350 MHz design.
Very similar feature set to SDS1104X-E however the 4ch model offers more total capability if BW is not a concern.
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