Which calibration is right?

[overeasy]

Posted this today.

Derived Three-Phase configuration

This technique seems to have worked with several users and is a little different from what’s in the docs. I’ll revisit the docs soon but wanted to get it into the forum because typing into individual posts is getting old. This is a fairly straightforward way to get the mains reading correctly. Tools required: A fairly high plug load, preferably a resistance load, like a hair dryer, steam iron or electric pan. Even a 100W incandescent lamp will do. It should be a plug-in device. A powe…