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Functional comparison of R&S RTB2000, Siglent SDS2000X and Keysight DSOX1000
RBBVNL9:
Perhaps the best option is to simply export all 64k points (how whatever number there are) and search for the aliasing tones. This way, you’re not limited the screen resolution or screen re seeing algorithms…
maxwell3e10:
This is a great review! I am just looking at these medium-range scopes for a specific feature: ability to do fast waveform averaging.
To test the speed of averaging I use a 1 Hz sine wave as an input, a short time base and minimum number of waveform points. One can use auto trigger or a 100 kHz or higher trigger source. Then switch acquisition to averaging mode and keep increasing the number of averages until the amplitude of the 1 Hz waveform oscillating on the screen reduces by 1/2 (the waveform appears as just a straight line going up and down).
Among the low-cost scopes I tested the winner appears to be Keysight EDUX1002 scope, which can do 128 averages before the amplitude of 1 Hz sinewave reduces to 1/2.
It would be great to test these scopes for this metric or any other than could be contender for fast real-time averaging.
Markus2801A:
Thanks to the OP! This is an amazing thread and also shows us how much the solutions depend on settings and the used equipment, also the implementation of the FFT which seems to be very different or "interpreted" different by the engineers of those scopes.
IMHO it would be nice if the FFT follows the same mathematically way on all scopes to easer get readable, comparable und understandable solutions.
BTW: Has anyone tried to reconstruct the signal with the FFT solutions?
rf-loop:
--- Quote from: maxwell3e10 on July 23, 2022, 07:21:20 pm ---I am just looking at these medium-range scopes for a specific feature: ability to do fast waveform averaging.
To test the speed of averaging I use a 1 Hz sine wave as an input, a short time base and minimum number of waveform points. One can use auto trigger or a 100 kHz or higher trigger source. Then switch acquisition to averaging mode and keep increasing the number of averages until the amplitude of the 1 Hz waveform oscillating on the screen reduces by 1/2 (the waveform appears as just a straight line going up and down).
Among the low-cost scopes I tested the winner appears to be Keysight EDUX1002 scope, which can do 128 averages before the amplitude of 1 Hz sinewave reduces to 1/2.
It would be great to test these scopes for this metric or any other than could be contender for fast real-time averaging.
--- End quote ---
Here Siglent SDS2000X HD
In this test I have used 1Hz sine, 600mVpp to channel 1
First three images oscilloscope run full speed without trig (Autotrig) 50ns/div (1kpts in one acquisition)
Persistence ON.
Measurement on. Only look statistics Pk-Pk value.
Maximum average in this scope is 1024
First image without average, just normal acquisition.
Next image average 256 (just small drop)
Next image average 1024 (now roughly 2.5% drop. )
Because max average is 1024...
Next I force oscilloscope more slow using external trigger. When trig signal is 2.105kHz with 1024 average finally 1Hz trace oscillation amplitue drop to roughly 50%
maxwell3e10:
Thanks, so this scope can average quite fast! But the maximum number of averages is a little limited.
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