A low-ohm measurement could maybe use a higher current? - so the algorithm starts with the low default current, and then tries e.g. a 10x higher current for a short time to make a low ohms reading, if it determines that it is dealing with a low resistance?
Yes. we can use higher current for low-ohm testing, but it's hard to implement in practice.
For example, there will be a resistor serial in the output driver and DUT, otherwise the output driver is easy to be unstable.
And this serial resistor is much larger than mili-ohm, so the driver current cannot be too large.
Most of the time, we are willing to using ultra-low noise amplifier to get lower test range.
And the other way is to using true four wire measurement.
These two directions are what we are working towards.