Products > Test Equipment
Oscilloscope input noise comparison
nctnico:
--- Quote from: JPortici on November 12, 2018, 12:42:40 pm ---is it me or is the 20 MHz trace for the keysight showing a digital filter?
--- End quote ---
Well spotted and I agree that it looks like a simple digital filter. y[n]= (y[n-1] * (a-1) + x[n]) / a.
EEVblog:
New Rigol 5000 & 7000, 20MHz and full bandwidth
https://www.dropbox.com/s/hxzjzidrofd9eli/Rigol5000-Noise.zip?dl=0
BravoV:
To OP, suggesting to update the 1st post with all accumulated result, rather than piling up at new post that is hard to keep up. Just add change list as a note.
maxwell3e10:
Dave, thanks for posting. I looked at the files, they are taken with 200 MHz sampling rate, so the noise is pretty high due to aliasing. Could you take data at the maximum sampling rate of the scope, as the other ones are.
rf-loop:
--- Quote from: maxwell3e10 on November 13, 2018, 01:53:49 pm ---Dave, thanks for posting. I looked at the files, they are taken with 200 MHz sampling rate, so the noise is pretty high due to aliasing. Could you take data at the maximum sampling rate of the scope, as the other ones are.
--- End quote ---
Is it possible that your suspected aliasing rise this noise to this enormous level. Also there is 20MHz front end BW on.
(!) 163.9 uV stdev (AC-rms) and over 1.6mVp-p. (Dave's 5000-1-20.csv)
Is it made using 4mV/div? (most low true full resolution)
Vertical resolution in file is 135.4uV
Rigol: Note[3]: 1 mV/div and 2 mV/div are a magnification of 4 mV/div setting. For vertical accuracy calculations, use full scale of 32 mV for 1 mV/div and 2 mV/div sensitivity setting.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version