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| Oscilloscope input noise comparison |
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| maxwell3e10:
Some time ago I collected shorted input data from several oscilloscopes to compare their noise. More discussion is in this topic https://www.eevblog.com/forum/testgear/owon-xds3062a-input-noise-(good)-and-glitches-(bad)/ Recently I got a Keysight EDUX1002 scope, so I thought I would compare it to the Chinese brands. As one might expect, the noise spectrum of the Keysight is very clean, but the absolute noise level is a little higher for this entry level scope of comparable cost. Perhaps it would be interesting to compare higher-end scopes as well, but that's above my budget level :) |
| Sylvi:
Hi That's very interesting How did you measure the noise? I recently bought an OWON XDS2102A (100MHz, 12-bit) which is definitely showing me things I could not see with either of my previous CRT scopes - one was 50MHz Philips and the other a 20MHz Instek. |
| Hydron:
--- Quote from: maxwell3e10 on October 13, 2018, 03:58:10 am ---Perhaps it would be interesting to compare higher-end scopes as well, but that's above my budget level :) --- End quote --- If you could specify what data is required, then maybe people with higher end instruments could send in the files to analyse and add to the graph? I'd be happy to grab some data from my RTB2004. |
| maxwell3e10:
For this comparison I was using the longest time scale that gives 1 GHz sampling rate and the lowest voltage scale that allows full bandwidth. Then just save raw ascii file. To limit file size, use no more than 1M samples. The input is terminated into 50 Ohm. No averaging or artificial high resolution modes. |
| Hydron:
--- Quote from: maxwell3e10 on October 13, 2018, 08:02:53 am ---For this comparison I was using the longest time scale that gives 1 GHz sampling rate and the lowest voltage scale that allows full bandwidth. Then just save raw ascii file. To limit file size, use no more than 1M samples. The input is terminated into 50 Ohm. No averaging or artificial high resolution modes. --- End quote --- I've made a couple of quick measurements at full and 20MHz BW, can't do exactly 1GSa/s but could do 1.25, is that OK? I've saved them as CSV (could do binary as another option if helpful), have sent you a link to the download via PM as it's too big to upload on the forum. If you need different settings (e.g. due to the 1.25GSa/s thing) please let me know. |
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