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| How much noise floor and other things matter in oscilloscope usability |
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| EEEnthusiast:
For very small signals, use the FFT mode on the scope to find the amplitude. FFT does help to bring out signals from the noise (for periodic signals). For e.g. you could observe a 2mVrms sine wave with even 10mVrms of noise, by using FFT. |
| Fiorenzo:
Ok I have taken other photos but now with BW limit set to 20Mhz and the probe connected but grounded to its tip. Photos: 1) 1x probe 2) 10x probe |
| Fungus:
--- Quote from: Fiorenzo on December 24, 2021, 07:52:00 am ---Ok I have taken other photos but now with BW limit set to 20Mhz and the probe connected but grounded to its tip. Photos: 1) 1x probe 2) 10x probe --- End quote --- What does it look like at 1v/div? That's what you'll normally be seeing when you're working. |
| Fiorenzo:
Fungus you asked me to what I am comparing the noise: I saw some photos on the web of the siglent sds2000x+ and the measured RMS and peak to peak value, what I see on the Rigol seem to me many times higher.... Because I am no expert I cannot say the Rigol have too much noise and this is a problem for me. I am trying to understand/learn from you if It could be acceptable or a problem in some circumstance because I hope to do not change the oscilloscope for at least 5/10 years. |
| Fiorenzo:
--- Quote from: Fungus on December 24, 2021, 07:57:37 am --- --- Quote from: Fiorenzo on December 24, 2021, 07:52:00 am ---Ok I have taken other photos but now with BW limit set to 20Mhz and the probe connected but grounded to its tip. Photos: 1) 1x probe 2) 10x probe --- End quote --- What does it look like at 1v/div? That's what you'll normally be seeing when you're working. --- End quote --- I didn't change the volt scale only the probe attenuation. In the afternoon I am going to take the photos you asked, I cannot now. |
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