C-H,
Voltage Drop, is not really taken that seriously over here.
I normally only use the Data Logger, for Fault-finding purposes, where there is a
serious drop in voltage, and further more,
this really only occurs in Commercial/Industrial installations, I think that I have only used the DLogger, in a domestic situation once, by memory.
It's just handy to see what is happening to the Voltage(especially 3phase), over a longer period of time. [Linked Image]