I have noticed the maximum frequency of logging voltage and current is 5 second intervals with Emoncms and emonpi. Is there a way of logging voltage and current to 1 second or sub 1 second intervals?
I need to spot brief undervoltage spikes that I suspect are below the 230v +10/ -6% tollerance allowed on a UK 1ph supply. It might seem strange, but I suspect an undervoltage issue is having an issue with a heat pump install, hence the need to log data to this resolution. Yes, I know it will take up SD card space, but needs must! Any ideas?