Hello,

My calculations involve a measurement setup designed to measure capacitors with small inductances. Multimeters typically cannot measure in the pF range. This requires a resistor with a known resistance value (as close as possible), a signal generator (possibly using software and a sound card), and a 2-channel oscilloscope. Not only must two amplitudes be measured, but also the phase difference between the two signals.

The calculation works quite well with a sine wave. However, the results for the calculated inductances vary more than I had hoped.

Problem in this program: Why doesn’t Draw2D produce a graph when there is an arg() statement in the last key? If it is replaced, for example, by a -Re()- statement, then Draw3D generates a graph?!

Now I had hoped to be able to perform calculations using the determined complex transfer function even when the input is a square wave instead of a sine wave. Unfortunately, that doesn’t work. Why?

Regards, Andreas

Versuch mit R und C Sinus 01.pdf (2.19 MiB) downloaded 3 time(s). Versuch mit R und C Sinus 01.sm (814.63 KiB) downloaded 1 time(s).
Versuch mit R und C Rechteck 01.pdf (1.86 MiB) downloaded 3 time(s). Versuch mit R und C Rechteck 01.sm (555.42 KiB) downloaded 1 time(s).