michael.k...@gmx.at schrieb am Donnerstag, 16. Mai 2024 um 15:46:28 UTC+2: Since the (public) power grid is part of the hardware your local weewx installation is running on, this is far from being off-topic.
There are 3 types of UPS available: off-line, stand-by, and on-line. The first one is off as long as grid power is available and starts when the grid power goes off. The second one is similar, but it is in stand-by. So it start faster than the first one. The on-line one separates the grid and the output entirely. They are connected by DC only. So this type can additionally filter surges etc. The output frequency for the on-line type only depends on the internal circuit, while for the off-line and stand-by type the output frequency is always the same as the grid frequency. I use an on-line UPS and hope that will result in less damage in case of over-voltage, surges, and lightning strokes. To compare to Cameron's histogram I did one myself, based on 5 minutes averages of the grid frequency (NOT the UPS output frequency): [image: netzfrequenzhistogramm.png] This one has the peak at 50.00 Hz. -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/78c65e41-5ac1-4e13-9644-e46beb078147n%40googlegroups.com.
