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| LCR Impedance Viewer for Picoscope+Keysight+R&S Bode Plot Data (open source) |
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| _Wim_:
Hi Hans, This is the general principle I followed (and also in the Tektronix article) The only info we have is the voltage & phase at point A1 and A2 in the Tektronix figure. For A1 we set the phase to 0°, for A2 we use the phase FRA reports. From these 2 voltage vectors, the current vector can be calculated because Rref in known. We also know this current has to go through the DUT. By using ohms law and knowing both the current vector and voltage vector in A2, we can calculate the impedance of the DUT. From there I think our calculation methods agree to extract ESR, Capacitance and inductance from the impedance. Hope this clarification helps. |
| Hans Polak:
Hi Wim, Step one. I did the math my way with all the figures from the Tektronix article, and got the exact same figures as they did. Hans |
| Hans Polak:
Second test now with 10mH. Again, exactly the same figures as Tektronix. Hans |
| Hans Polak:
Wim, For completeness, here's the Excel file that I used for the above calculations. Hans |
| Hans Polak:
Wim, This is the test circuit I propose for testing the calibration with 1)probe alone and 2) probe +75pf Can you agree with this ? Hans |
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