aes92000:
tnx guys,
glad i asked.
small correction, i have a 1200A, not 1500A, shunt. not that it's gonna matter anyhow.
it had stamp of 50mV and i was thinking it was good for input to ic but it reads .4 ohm so i don't believe i will be using it.
the 200A is stamped 75mV with .3 ohm on DMM. fat chance to use that also.with the amp rings, anyone use any of the like before and with good results? i will do more googling to see what i an find.
You are being fooled by your multimeter - you cannot measure small resistance
values directly with a multimeter because the resistance of the leads and the selector-
switch in the meter itself will totally dominate the reading.
The way to measure a low value resistance is by using 4 wires. Two wires carry the
current to the resistor, the other two (the meter probes) measure the voltage across
the resistor (multmeter in voltage mode, not resistance mode).
For instance pass 10A through a 0.0005 ohm resistor and see 5mV across it.