How to get the current of the Jetson Nano modules

Hello everyone,
We have Jetson Nano module(with 16GB eMMC)on our carrier board (designed by ourself).But I can’t read VDD_IN critical current limit.

cat: '/sys/bus/i2c/drivers/ina3221x/6-0040/iio:device0/crit_current_limit_0': Resource temporarily unavailable

by the way,whe i run the jetson_benchmarks the system pops up the message:“System is now being throttled”

please try to enable tegrastats utility to check statistics reports.