Re:Common Hall-effect sensor myths
by kragen on Monday January 16, 2023 @10:28AM
(#34401561)
your ±1% 1Ω shunt resistor might actually be 0.99Ω, maybe depending on temperature (which changes after you power up the load), but you can get ±0.01% resistors pretty cheap these days
(maybe not if they have to handle 150 amps tho)
typically the bigger issue is the reference voltage the adc is comparing it against, because a voltage reference with 1% precision that's stable over time is pretty challenging, and also needs to be calibrated
but i'd think that would also be the case for calibrating the driver for the cancellation current in the hall-effect sensor?
(maybe not if they have to handle 150 amps tho)
typically the bigger issue is the reference voltage the adc is comparing it against, because a voltage reference with 1% precision that's stable over time is pretty challenging, and also needs to be calibrated
but i'd think that would also be the case for calibrating the driver for the cancellation current in the hall-effect sensor?