Hello, I need help with a power inverter efficiency measurement that I'm trying to do in a Fluke 435-II. I have read the handbook and it doesn't show how to connect the fluke in a single-phase power inverter, only in a three-phase inverter as it's shown in the next image.




So, I tried to connect the voltage and current probes that in the image are shown connected to the Line L2 and L3 in my single line and I leave the same connection in the DC stage. However the efficiency value was so small, around 5% and it is impossible in my design.
Afterwards, I tried to connect only the line L1 in my single phase with the same connection in the DC stage but the efficiency value was around 2000% and it is impossible too.

Therefore, could you help me with a diagram or some instructions about how to do de measure??

Thank you

 

Have you looked at chapter 6?
https://dam-assets.fluke.com/s3fs-public/F430-II_umeng0100.pdf

 

Yes, I have even changed the wiring configuration as it's shown at chapter 24 to single-phase connection but it doesn´t work.