I have a shunt with markings of 500AMP - 75mV - 0.5. the first two are self explanatory but the last number I can only assume refers to tolerance percentage?
Second question I have is about resistance. Using Ohms law, is it correct to assume this shunt has a resistance of 0.00015 Ohm?
Thanks
Val
Welcome, Val, to the OEM forum.
Yes, you are correct on both. The 0.5 will be the tolerance - 0.5%, and the resistance will be 0.15 mΩ.
And at the rated current, it will be dissipating 37.5 W, so it will get very warm.
Is it a 4-terminal one? If it does have 4 terminals, and it almost certainly will have, two will be for the main current-carrying cables and the two smaller terminals - probably inside the main terminals - are the voltage terminals that go to your meter. The 15 mΩ will appear between the voltage terminals.
Thank you very much. Yes it has 4 terminals. Two 3/8 bolts and two #10 screws for the meter. I hope to never get anywhere close to the 500 amp rating. Lucky if i ever get 60 amp out of my alternator during charge. Discharge is even less.
So, only 7-8 mV to the meter?