AC Line Voltage 34 Hour Log
Out of curiosity I set up a properly isolated DVM to log my local AC line voltage over a period of approximately 34 hours. The results were both interesting and surprising.
The above is a plot of AC Line Voltage vs Time.
Interesting points to note:
- The lowest voltages occurred from about 17:00 – 23:00 local time (120vac and below)
- The highest voltages occurred from about 23:00 to 05:00 local time (121vac and above)
- The data set comprises over 6000 observations (one every 20 seconds)
- Vmin = 115.9 vac
- Vmax = 122.1 vac
- Vrange = 6.2 vac
- Vmean = 120.04
- The data are not normally distributed