Hi Lepettp or good morning!
You wrote:
......I understand that the size of gold has influence. I will get a size of gold and size of iron that at the same distance from coil, gives the same difference in integral of signal. Then see if there is difference in dU/dT of graph.....
It should not be. Even insignificant difference in the sums should be.
Check up number of bits. If it is equal 8 bits then too low resolution on amplitude.
Should be 16 or 24 bits (amplitude resolution is 1/16384 for 16 bits and 255/16384 for 24 bits).
Besides check up the sample rate, main delay and width pulse. Probably your program can not synchronize with beginning of a pulse. Or these parameters are established at the end of a pulse.
Mine program (placed on a forum) use parameters of my sound card (Realtek AC97 Audio, 48000 for 16 bit and 96000 for 8 bits) . It is enough for this purpose that you wrote (small pieces of gold and iron).
It is necessary to change parameters. Earlier I wrote, that you should inform me parameters of your sound card and I shall do necessary changes in my program.
Tell me full name your PIC. I want see parameters this PIC with datascheet please
Best wishes
Wus47
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