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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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