Analyze and modify a resonant circuit

I am struggling with a configuration that is prone to oszillation unwanted. The reality is a little more complex, but I think I can simplify the circuit to a resonant circuit. I have an electronic charge that seems to have a current measurement resistance (R), an inductor in the output (L) and my HAD who can enter a wide range of capacity (C).

In a first time to General questions about the analysis with LV I use "Real FFT PtbyPt":

* Is it the right choice or should I use "Complex FFT PtbyPt" or another?

* I have read the FFT needs a stem of 2 samples, currently I used the length of the sample of 1,000, should I use 1024 instead?

* How get/calculate the frequencies?

Is more important for me to change the frequency of resonance at a higher frequency. My feedback circuit which amplified the resonance to the oscillation can be switched from fast to slow. For some EHR, the resonance frequency is high enough, so I don't see mode "snail" (which is sufficient for the application), but I can see it in fast mode.

I will not be able to change C and L in the circuit and are limited by the values of R. But I can make a few changes like put a resistor or capacitor in the result of my electronic load. In the past, others were able to eliminate similar issues by doing this with trial and error to set the value of R or C. These tips show some, but not the way you want. If someone who has an idea about that?

Felix


Tags: NI Software

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