The instructions are pretty easy, but read the thread as you have to calibrate it as well. I cheat and use my 'scope, but there's a "quick-n-dirty" method that Stan came up with.
The other thing to note is you must use a pure sine wave transformer in the testing. That's most any brick or post-war transformer, but NOT something like the ZW-C with the bricks, ZW-L, or any of the MTH Z-xxx controllers with the brick. You can use the brick from everything but the ZW-L (no brick), but not the front-end voltage controller.
