Now we can do some measurements. When performing this test, simply a tube where air was blown into was used, and the result was recorded. The green curve is the voltage input, the red curve is the current input and the blue curve is RS232 input.

Since this measurement is quite slow, we just simply store the results with no triggers. Basically the recorder, some digital meter and maybe a bar graph is enough to make a visualization of the results. Let's store some data and observe the differences between the traces.

Measurement