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Oscilloscope for low frequency measurements 1 mHz - 20 MHz

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Performa01:
For frequencies that low, long sweep times are quite normal. A Picoscope 6242 is on par with an e.g. HP35665 in this regard.

44 minutes sweep for a 381.5 µHz frequency step (aka bin width), measuring a 100 mHz and 200 mHz sine wave simultaneously (reply #57):

https://www.eevblog.com/forum/testgear/low-frequencies-on-spectrum-analyzers/msg1468441/#msg1468441

Notice the high dynamic range and SNR. The Pico 4262 includes a simplified frontend design which has the usual 1/f noise of a FET input stage, but not the excessive LF noise of all the wider bandwidth general purpose oscilloscopes with split path input buffer.

It is limited to 5 MHz bandwidth and I think it does not have a noise densitiy function - but that should be the least concern. Decide for a useful window function and then you know the factor to multiply the frequency step in order to get the RBW, from this you can calculate the single factor which converts the individual readings into noise desitiy, i.e. nV/sqrt(Hz).

Alex Nikitin:
Just for fun I've fired up my HP3563A and set it to look at self-noise (50 Ohm plug on the input) in 1mHz-1Hz range. Took a while ;) . Not that great at 1mHz, above the 1/f corner it measures ~20-30nV/rtHz

Cheers

Alex

Sphyrna:
Pico don't has a out of the box solution too. With some programming you could do it: https://www.picotech.com/support/viewtopic.php?t=41417. But with some programming I would guess the most scopes could do it if you can access the data.

2N3055:

--- Quote from: Sphyrna on October 30, 2023, 09:01:57 am ---Pico don't has a out of the box solution too. With some programming you could do it: https://www.picotech.com/support/viewtopic.php?t=41417. But with some programming I would guess the most scopes could do it if you can access the data.

--- End quote ---

That is very correct. But, Picoscope has direct access API (no SCPI) that is faster (way faster!) and easier to use.
For instance you have ready examples how to get data in C# or Matlab.
I used Matlab in several occasions, just copied example of getting data, and then simply run the analysis with all the built in functions.
There is Python lib too.

Picoscope API does not provide measurements though.  But it is better for raw data to PC.

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