I need to automate a power to ground test for a device which outputs 12V / 30A.
There is a .4 ohm resistive load connected to the device which it is driving, however if I remove that load and go straight to ground, the current will be much larger.
I = V/0 = Infinity
Of course the resistance of the conductor will not be exactly zero but I'm assuming the current will be very high, probably high enough to ruin my multimeter! I'm trying to rate a relay to switch the load.
Do I just measure the resistance through the relay and the associated wires in order to gauge the inrush current requirement or is there a better way to do it?
(The problem with the former method is that I need to measure a relay I don't have.)