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Pocket-Sized 6 GHz 1 TS/s ET Scope
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joeqsmith:

--- Quote from: SJL-Instruments on February 26, 2024, 06:26:40 pm ---You should also take the differences of the voltage array, and perform a division. The PDF is given by dF/dV.

--- End quote ---

Shown with diff and division for example.  Numbers seem very high.  When you plot this, do these values go through another conversion?


SJL-Instruments:
Yep, these numbers look correct. Units are in probability density per volt. For intensity-grading, the overall scaling is arbitrary and is controlled by the brightness slider. The official software has some auto-ranging for convenience, but it’s not necessary.

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The first point in your result (with a negative dV) should be thrown out. Each final PDF value corresponds to the interval between two neighbouring CDF points.
joeqsmith:
Thanks for double checking my work.    It's interesting how this thing works.   I will need to think about how best to plot it.   

Poor mans PAM4 simulation gets a bit messy.   You can turn down the brightness to remove some of the dots, but the switch points will wash out.   Of course the question is if my test signal actually has this much noise.   


SJL-Instruments:

--- Quote from: joeqsmith on February 27, 2024, 12:20:24 am ---Thanks for double checking my work.    It's interesting how this thing works.   I will need to think about how best to plot it.   

Poor mans PAM4 simulation gets a bit messy.   You can turn down the brightness to remove some of the dots, but the switch points will wash out.   Of course the question is if my test signal actually has this much noise.   

--- End quote ---
This results from statistical noise in the CDF samples. What value for Nmin (minimum triggers per CDF sample) are you using? The noise will reduce as you increase this value.
joeqsmith:
Auto.  So, I'm not sure.  Assuming the the grayed out values are what it is using, then 329.   If I manually bump it to 10,000 it does clean things up but of course, takes much longer to sweep.   
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