I just remembered that several of my IPMI/BMC chips do report the voltages on various power rails. While this is awesome it does not report if the power from the power supply to the HDD is low/high
So the power that the BMC sees in the board is something that could be monitored and alert on when troubleshooting strange situations On Thu, Jun 4, 2026 at 1:53 PM David Christensen <[email protected]> wrote: > > On 6/3/26 19:12, Eben King wrote: > > On 6/3/26 10:36, Stefan Monnier wrote: > >>> They are also going to be polled, and will return the voltage they find > >>> at polling time. What they won't tell you is what various ripple > >>> voltages are, both the initial rectified mains at 100/120Hz and the > >>> residual switching frequencies of the various step-down regulators. > >> > >> Yeah, I think we'd need a kind of sensor that doesn't give just the > >> current voltage but gives a bracket of the lowest & highest voltage seen > >> since the last measurement, or one that can trigger an interrupt if the > >> voltage ever goes outside of a given range. > > > > I want something that does a Fourier transform of the voltage data so I > > can see if there's ripple at any particular frequency. A live waterfall > > plot would be wonderful. > > https://www.tek.com/en/products/oscilloscopes/dpo70000sx > > > David > -- - Andrew "lathama" Latham -
