We have our meter set up for line cycle accumulation mode and accumulate for 60 half cycles. We also tried 120, but there was no difference.
The problem we are running into is that the value we get from the VRMS register changes by about 2% when we change the line frequency between 50Hz and 60Hz.
According to the data sheet, if I read it correctly, this should only be on the order of 0.4%.
Is there something else that we need to do in order to handle the voltage between these two frequencies with better accuracy?