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| Two Tone Test with Scope and SA |
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| tautech:
--- Quote from: mawyatt on July 31, 2020, 09:32:48 pm ---Don't think you need to use the FFT max hold feature. --- End quote --- You certainly don't if you don't mind looking at all the noise at noise floor levels. I don't as I'm only interested in the fundamental and its associated peaks therefore I mostly use some form of peak/max hold. All screenshots done thus far here are with max/peak hold. |
| mawyatt:
--- Quote from: jjoonathan on July 31, 2020, 08:59:16 pm ---Here's a SDG6022X into a RTO1024 oscilloscope and FSP spectrum analyzer. (Attachment Link) (Attachment Link) --- End quote --- This is superb performance, what you would expect from a 16 bit ADC based scope!! However it's well out of the price range of these other scopes, and I see it's been replaced with the RTO2000 starting at only $14,500!! Best, |
| mawyatt:
--- Quote from: tautech on July 31, 2020, 08:02:12 pm --- --- Quote from: mawyatt on July 31, 2020, 06:45:25 pm ---Could I impose on you to do a couple of these tests with the 10 bit ADC mode? --- End quote --- 10 bit mode with 10 KHz and 10 MHz 2 tone tests. AWG output now 0 dB. Envelopes are always fun to get solid triggering on so holdoff added as/if required and done previously. ;) Again, SDS2104X Plus and SDG2042X. --- End quote --- Thanks for running these tests again. Appears the 10 bit doesn't improve over the 8 bit performance which makes me wonder if the 10 bit is achieved with some sort of signal averaging rather than a true direct 10bit digitized result? Best, |
| mawyatt:
--- Quote from: tautech on July 31, 2020, 09:40:14 pm --- --- Quote from: mawyatt on July 31, 2020, 09:32:48 pm ---Don't think you need to use the FFT max hold feature. --- End quote --- You certainly don't if you don't mind looking at all the noise at noise floor levels. I don't as I'm only interested in the fundamental and its associated peaks therefore I mostly use some form of peak/max hold. All screenshots done thus far here are with max/peak hold. --- End quote --- I prefer to see the noise floor, as sometimes there might be some information buried within. Everyone has a preference!! BTW the 10KHz Time Domain plot doesn't look like the envelope is extending down to zero, is this just an artifact of the display & time base or is the waveform envelope not getting to zero? Best, |
| tautech:
--- Quote from: mawyatt on July 31, 2020, 09:45:33 pm ---Thanks for running these tests again. Appears the 10 bit doesn't improve over the 8 bit performance which makes me wonder if the 10 bit is achieved with some sort of signal averaging rather than a true direct 10bit digitized result? --- End quote --- 10 bit explanation here: https://www.eevblog.com/forum/testgear/siglent-sds2000x-plus-coming/msg2783928/#msg2783928 --- Quote from: mawyatt on July 31, 2020, 09:50:19 pm ---I prefer to see the noise floor, as sometimes there might be some information buried within. Everyone has a preference!! --- End quote --- Each to their own. :P ;D --- Quote ---BTW the 10KHz Time Domain plot doesn't look like the envelope is extending down to zero, is this just an artifact of the display & time base or is the waveform envelope not getting to zero? --- End quote --- Yeah I spotted that too so will investigate.......... Did it also happen in 8 bit mode ? Haven't looked yet. |
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