# Reported Voltages

**URL:** <https://discuss.blues.com/t/reported-voltages/3484>\
**Category:** Uncategorized\
**Created:** [March 3, 2026, 1:38am UTC](https://discuss.blues.com/t/reported-voltages/3484 "2026-03-03T01:38:16Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![sn13TX](https://avatars.discourse-cdn.com/v4/letter/s/0ea827/32.png) [@sn13TX](https://discuss.blues.com/u/sn13TX)\
**Post date:** [March 3, 2026, 1:38am UTC](https://discuss.blues.com/t/reported-voltages/3484/1 "2026-03-03T01:38:16Z")

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I get the brown-out & hard reset often, but if I understand Rob’s explanation from another post it is expected within 15 minutes of connection. However, I am curious as to where these voltages numbers come from in the json:

{“method”:“boot”,“text”:“boot (brown-out & hard reset [17494])”,“voltage”:4.3476562,“voltage\_mode”:“usb”}

I’m feeding 5 volts in to the VUSB pin and measure it as 5 volts at the board, but this shows much less. Why?

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**Author:** ![RobLauer](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.blues.com/roblauer/32/1567_2.png) [@RobLauer](https://discuss.blues.com/u/RobLauer)\
**Post date:** [March 4, 2026, 9:27pm UTC](https://discuss.blues.com/t/reported-voltages/3484/3 "2026-03-04T21:27:07Z")

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Hi @sn13TX,

What’s likely happening is the voltage value reported in `_health.qo` is the VMODEM\_P rail voltage, not the input voltage. Since it measures the voltage at the modem power supply rail downstream of the regulation/protection circuitry, you’re always going to see a lower value than your input voltage.

Rob