> Differential isn't so bad if the absolute values are low enough.  For
> voltages, I think you can do just fine with a simple voltage divider
> based on maximum output voltages, but for current I would think that the
> errors introduced are too big compared to the values you're measuring.

The original discussion was about a benchtop power supply, not a precision
instrument.  You should be able to get a ground-referenced voltage that
indicates load current to within a few percent accross the input supply
range.


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