Post B60CKwuAx9Qd8bz4uu by azonenberg@ioc.exchange
(DIR) More posts by azonenberg@ioc.exchange
(DIR) Post #B5zpflDfIUeO1z3SjI by azonenberg@ioc.exchange
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I wonder if a voltage regulator at the local utility was having some problems? A couple weeks ago I saw much larger than normal variation in mains voltage than I've ever seen before, both high and low, then it cleared up.
(DIR) Post #B6064lZ6kNNzbs1vF2 by 0h00000000@ioc.exchange
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@azonenberg Maybe they were doing some maintenance?Do you have a plot of frequency for the same time period?
(DIR) Post #B60947q8kDM6GaNnHM by azonenberg@ioc.exchange
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@0h00000000 I do but it's only like 0.1 Hz resolution so basically useless. I want higher res but the UPS internal monitoring doesn't report it so I'll need to collect the data some other way
(DIR) Post #B60CKwSWbxJJkr2zom by ldcd@social.treehouse.systems
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@azonenberg @0h00000000 can it give you instantaneous voltage?
(DIR) Post #B60CKwuAx9Qd8bz4uu by azonenberg@ioc.exchange
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@ldcd @0h00000000 no it's averaged over a pretty long window
(DIR) Post #B60CKyCe7xnVABdLLU by ldcd@social.treehouse.systems
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@azonenberg @0h00000000 even if it's very slow to do the request you could like 3rd or 4th nyquist sample it
(DIR) Post #B60CmZwXuy9w21Gew4 by azonenberg@ioc.exchange
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@ldcd @0h00000000 a friend is building a tool that will do full mains waveform logging with like khz sample rates and i want one
(DIR) Post #B60CpPHA2HdBodG5rc by azonenberg@ioc.exchange
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@ldcd @0h00000000 it's good enough that like when it's windy you can see waveform distortion from arcing on loose contacts
(DIR) Post #B60FweS4JIFylxVTkG by ldcd@social.treehouse.systems
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@azonenberg @0h00000000 i've been considering getting an ACS37800 for my dad for this purpose for a while; he lives in a pretty rural area and when SoCalEdison is doing maintenence sometimes the voltage rises slowly from like 30VAC to 240 over like 30 minutes
(DIR) Post #B60Fwej5I1rrcjT4Ge by ldcd@social.treehouse.systems
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@azonenberg @0h00000000 Has not caused any serious damage because so far he's been there and caught it when it does that and pulled the main breaker but would be good to have receipts if it does
(DIR) Post #B60FwewYTwdwIVlpGS by ldcd@social.treehouse.systems
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@azonenberg @0h00000000 I have no idea how they are managing to cause that to happen though
(DIR) Post #B60Fwf67uMIcmCFTBQ by azonenberg@ioc.exchange
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@ldcd @0h00000000 oof lol. Yeah all my important stuff is behind the 9px6k so it doesn't care :p
(DIR) Post #B60LJzwT4jXjr3g4vY by 0h00000000@ioc.exchange
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@azonenberg I built this guy to measure current on 3 phases plus ground and also with a screw terminal to measure 3 phases of 480voltage with a isolated ADC. USB FS power and coms, STM32U5 MCU. 200A peak on CTs. The footprint is also compatible a with Rowgowski coil.Firmware is functional but needs some TLC. Maybe you’d be interested in helping if I sent you one. U5 has 14 bit ADCs. I have a basic static HTML page with Debian charting in Chrome with D3.JS.
(DIR) Post #B60i1OBP1QfMTpl6eW by joXn@wandering.shop
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@azonenberg Did you happen to have something tracking mains frequency as well? If it’s a piece of local equipment causing the problem I wouldn’t expect any frequency deviation.
(DIR) Post #B61DKOmw5nneRGrKoS by azonenberg@ioc.exchange
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@joXn Yes and no: the UPS also logs frequency but only with 0.1 Hz resolution.It'll see the frequency shift when grid power goes down and I switch to the emergency generator (much less stable, usually runs around 63 Hz and shifts around a bit) but during normal operation it's flat at 60.0 and lacks the resolution to see any shifts with load etc