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November 8, 2017 at 4:20 am #19182
If you need absolute measurement you’ll need a calibrated shunt, something like this:
250 uohm Current Sense Resistor
200 Amps through a 250 micro-ohm shunt will give you 50mV across the shunt.
Otherwise you could just use a length of thick wire with suitably heavy terminals. But it’s difficult to calibrate.