gunrunnerjohn posted:You'll find that any of these circuits are not all that accurate, especially for non-sinusoidal waveforms. I went through this a few years ago when I was building a track voltage monitoring car. I ended up finally finding AC meters, but even those don't do well with chopped waveform transformers. However, they tracked a lot better than the DC meters I tried to use with rectification.
I made a distance car once, calibrated it in feet. Useless but interesting to measure how much track you have.
