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Current Source: Digital power supply set to 10V, 0.5A
Diode: Generic 10A-rated silicon diode (10 diodes in series).
RSH: 10k 1/8W resistor
RS: 5A glass fuse acting as the series resistance (about 30mOhm resistance).
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I tested with an e-load connected to the output, set in constant voltage mode. Also used remote sense on the e-load to get more accurate voltage measurements (not really needed at these low currents, but it was easy to do). I swept the constant voltage from 0 to 10V while measuring the voltage and current and plotted the following graph:
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