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Help me choosing new Oscilloscope
bigfede:
--- Quote from: tautech on February 16, 2023, 08:13:21 am ---
--- Quote from: bigfede on February 16, 2023, 07:53:03 am ---I've seen this video surfing around on YT and I was not sure on my choice. I mean: the Ripon have 8Gsa/S ( :Pthat for the prize is amazing) but Siglent "only" 2..
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Yes two 2GSa/s ADC's each serving 2 channels and each ADC with 200 Mpts memory depth.
With 4 channels driven SDS2000X Plus provides 1 GSa/s and 100 Mpts max per channel.
Lesson is the big numbers need be broken down to see the full picture.
SDS2000X Plus is a 350 MHz 4ch or 500 MHz 2 channel design depending on how you need to use it.
However, you said the DS1054Z screen was too small for your liking but with a DSO with a webserver you can port the display to a PC display where you won't have any issues with waveforms or FFT being to small.
But this always comes back to needs and available budget. :popcorn:
--- End quote ---
Thanks for your suggestion. My point here is to understand if 8Gsa/s VS 2Gsa/s can make really the difference. I was aware that the front end (Rigol) is pretty noisy.
tautech:
--- Quote from: bigfede on February 16, 2023, 08:47:22 am ---My point here is to understand if 8Gsa/s VS 2Gsa/s can make really the difference.
--- End quote ---
You missed the point as each have their pluses and minuses. Max sample rate is governed by the # of active channels.
Siglent X Plus and many of their other models use 2x ADC's so when all channels are active the resultant sampling rate determines the system BW for it not to break Nyquist.
Typically its 2.5x BW which for 350 MHz requires 1 GSa/s where for the SDS2000X Plus this is met with all channels active.
But by using 2 ADC's BW can be pushed to 500 MHz and still meet Nyquist on the condition just one channel is used on each 2 GSa/s ADC.
This is managed automatically with BW limiters on the X Plus with Full BW when just 2 channels are used or a 350 MHz BW limit is engaged when a 3rd channel or subsequent is activated.
In reality SDS2104X Plus has a 4ch BW of ~185 MHz and SDS2504X Plus nearly 600 MHz with 2 channels active but 350 MHz when a 3rd or 4th is activated.
BillyO:
Your original post says "I do not use scope for "fast" signals (I have never measured signals faster than 10MHz) ". Now it seem you are hung up on 8Gsa/S vs 2Gsa/S. Have your requirements changed?
First, teh Rigol is 8Gsa/S only for a single channel, by the time you activate all 4 you are down to 2Gsa/S.
The higher sample rate is only really important for the display more complex HF signals. The analog BW of the Rigol will ensure those signals are pretty much filtered to a sine wave by the time the 8Gsa/S becomes an important factor. So I'm really not sure why it is emphasized so much in their marketing. It's really there because they use a single ADC and they want to have 2Gsa/S with all 4 channels enabled. That is a minor advantage over the Siglent. You will, if you need to look at 250MHz +, get a little better signal representation with the Rigol. However, there a far more advantages in favor of the Siglent over the Rigol in other areas.
You need to decide what is important to you and make your decision on which scope best delivers what you need. But the 8Gsa/S is not something you can fully realize on the Rigol so it's probably best you don't get too hung up on it.
bigfede:
--- Quote from: BillyO on February 16, 2023, 02:45:10 pm ---Your original post says "I do not use scope for "fast" signals (I have never measured signals faster than 10MHz) ". Now it seem you are hung up on 8Gsa/S vs 2Gsa/S. Have your requirements changed?
First, teh Rigol is 8Gsa/S only for a single channel, by the time you activate all 4 you are down to 2Gsa/S.
The higher sample rate is only really important for the display more complex HF signals. The analog BW of the Rigol will ensure those signals are pretty much filtered to a sine wave by the time the 8Gsa/S becomes an important factor. So I'm really not sure why it is emphasized so much in their marketing. It's really there because they use a single ADC and they want to have 2Gsa/S with all 4 channels enabled. That is a minor advantage over the Siglent. You will, if you need to look at 250MHz +, get a little better signal representation with the Rigol. However, there a far more advantages in favor of the Siglent over the Rigol in other areas.
You need to decide what is important to you and make your decision on which scope best delivers what you need. But the 8Gsa/S is not something you can fully realize on the Rigol so it's probably best you don't get too hung up on it.
--- End quote ---
Thanks, this is the kind of discussion I need to decide.
But now, why Siglent is so much better? Apart that it cost 300€ more.
Fungus:
--- Quote from: BillyO on February 16, 2023, 02:45:10 pm ---First, teh Rigol is 8Gsa/S only for a single channel, by the time you activate all 4 you are down to 2Gsa/S.
--- End quote ---
Sure, but that's not obligatory. You can have 8Gsa/S when you really need it.
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