110828-1016 EDT
In rereading this thread I found a major mistake I made in the post I identified as 110811-0909 EDT
You install a 3 prong plug on the 120 V leads to the MTU so it can be plugged into the same outlet as the device to be tested. Also connect the display unit to the same outlet. It is important that the black wire of the MTU go to the neutral pin of the plug.
The wrong part is black to neutral. This results from my long time connection with radio and electronics where "black" is the universal color for ground or common. In the power industry white is used for the grounded current carrying conductor and green for the non-current carrying equipment grounding conductor.
So my incorrect statement must be changed to read ---
It is important that the white wire of the MTU goes to the neutral pin of the plug.
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