I need to sniff the physical layer of a proprietary data line with a logic analyser, but my analyser is limited to 5V input. Unfortunately the line runs at 47.5V, which would fry everything. I considered a simple voltage divider, but I'm concerned that I might pump a lot of current through it, or affect the data on the line.
Any suggestions on a way to do this? It doesn't need to be robust - it's just a one-time hack for a single purpose.
EDIT: To answer some of the questions asked: I don't know if it's 47.5V DC offset or 47.5V p-p, as I only have a single figure given to me as part of the spec. It's an old system produced by a company that no longer exists, so getting original specs and info is practically impossible. The data rate is 2Mbps, which to me implies that it shouldn't exceed 4MHz at the physical layer.