Most of us can only dream of owning test equipment like the Rohde & Schwarz URE-3 RMS/Peak Voltmeter (up to 30 MHz). But it's already "old" (1990's?), so let's hope they don't discontinue it.

"Jianfeng waveform" ... would that be the work of Jianfeng Weng? I had not come across that notation before.

But here we go. The bit I liked the best comes at the end:- Fourier's Song!

If you don't inspect ... don't expect.