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| Rigol MSO5000 HiRes mode |
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| Anding:
Scope self-noise, nothing connected |
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| gf:
--- Quote from: Martin72 on October 29, 2022, 11:29:35 pm ---First and very simply, you can check it´s own noise with and without hi-res mode, visually. --- End quote --- Self-noise w/o any input signal is basically THE important thing to check. It should be checked at different V/div settigs, comparing normal and hires mode at each V/div. The quantities of interest which should be measured are - Standard deviation (gives the RMS voltage of the noise as a single number, with DC excluded) - FFT spectrum of the self noise over the full 0...fs/2 frequency span, on a vertical dBV scale, where fs is the sample rate Ensure that the FFT sample rate is the same as the capture sample rate (i.e. that neither up- nor down-sampling is involved) The resolution does not need to be very high, 16k points (for instance) are certainly sufficient. [ If enabling hires does not lead to the expected amount of noise reduction (and there is a suspicion that it does not), then the key may be spectral power distribution of the noise, so it is advisable to check it. ] Initially I'd only consider a timebase with the maximum sample rate. In subsequent steps, slower timebases can be checked too. |
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