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| Oscilloscope input noise comparison |
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| Performa01:
--- Quote from: Rich@RohdeScopesUSA on October 20, 2018, 03:07:22 am ---We typically recommend the same method Daniel suggested (smallest volt/div setting, AC RMS or std deviation or a vertical histogram) with one addition (which I think Daniel would agree with) - you should really figure it as a percent of full scale as some oscilloscopes have 10 vertical divisions and some only have 8. --- End quote --- This is why I usually express the noise in LSB instead of µV in my graphs. Of course, for this you need to know how many LSB/div. a certain DSO has - and keep in mind that this number will be far less for the zoomed (not full resolution) gain settings that some scopes have. |
| maxwell3e10:
Here is a compilation of noise spectra for several more oscilloscopes: R&S RTB2004 thanks to Hydron Instek GDS2204E thanks to nctnico R&S RTM3004 thanks to nctnico Rigol DS6104 I grouped them by the sampling rate, 1 GHz and 5 GHz. It looks like Rohde & Schwarz scopes have the lowest noise among the scopes tested so far. |
| Andreas:
Hello, how many samples are you actually using for calculation for the 1 GS/s sample rate? the minimum calculated frequency seems to be ~500 kHz with 500 kHz step resolution. So it seems that you are using 2048 points for spectrum calculation. (that would be a number which can easily uploaded as CSV here against the 1MS limitation from above). with best regards Andreas |
| Performa01:
Yes, for these graphs the data can easily be uploaded in this forum and that has been done in that other thread, linked in the opening post. Just have a look there. The problem only arises when we shall provide data suitable for analysis down to 10Hz. |
| nctnico:
It would be interesting to see what the new DSO/MSO7000 from Rigol looks like when it comes to noise. |
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