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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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