Thanks, I'm familiar with measuring floating bridge voltages as I used to do work in this area some 30 years ago, so no problem there. It's really the digital sampling rate and bandwidth figures that I was wondering about since all my experience is with analogue equipment. For example, I wasn't sure if 100 MHz BW and 1GS/s shared between channels would be sufficient for capturing the transients and ringing accurately, or would I need something better?
Here are my rough thoughts on the subject, but I have no idea if my logic is correct or way off. To be working with rise times in the order of 10ns, that's around 100 MHz, so I figure a 200 MHz -3dB point would give me reasonable measurements there, and working on the basis of sampling at 10x the 10 ns to get accurate transient waveforms would mean 1GS/s, but since that gets shared between channels, then ideally that would be 4GS/s when shared between 4 channels? That sounds like maybe I could get away with something like a RIGOL 900 and just use 2 channels when it matters?