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LCR Impedance Viewer for Picoscope+Keysight+R&S Bode Plot Data (open source)
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_Wim_:
 I will have a closer look at this this weekend
_Wim_:

--- Quote from: Hans Polak on May 12, 2021, 02:13:52 pm ---Wim,
Before going into mathematical detail, may I ask you how many bits are used from Picoscope's options.
My Picoscope 5243B has various bit depth settings from 8 bits to 16 bits.
I don't know whether this is an option that your software can influence, bit more bits will of course result in more accurate results, especially when calculating a capacity.

Hans

--- End quote ---

Yes, maximum resolution is used => 15 bit for a 5000 series scope (see https://www.picotech.com/support/topic14311-180.html near the bottom). In the newest version of FRA4Picoscope a new API is implemented where this can be changed.

The API I am using always uses the highest resolution possible (which for this use case is ok I think)
Hans Polak:
Wim,
Working on the math, I ran into something strange.
Using the same .csv file for FRA Imp Viewer and Excel, where I had the math worked out, I got exactly the same shape for the inductance including all jaggies, but the values in my graph are roughly 1.5 times larger ?
The capacitance on the other hand is completely different, where FRA Imp Viewer seems to be wrong.
What I used was a 100R series resistor  and for the DUT another 100R resistor parallel to 10nF.
In the Excel version the 10nF is visible from 10kHz to 1Mhz

Hans


Hans Polak:
Wim,
Forget the inductance issue, error from my side.
Capacity is still wrong.

Hans
_Wim_:
Do you see the same effect when you measure an actual capacitor?
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