> Put a dummy load of resistance able to sink all the current the device
> provided
> Make PSU able to source that current + max current the device sinks

I went to suggest that then saw you had beaten me to it.

Note that some designs hate sinking current, regardless of voltage .
So you may want to place a diode from psu output to dummy load and
then take load from there. That way the psu cannot sink current when
things go aglae. One of my psu's made some nice magic smoke under
sinking when I didn't use the diode. (PSU didn't fail fatally, just
partially  internally incinerated as a rolling protest).



 R
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