I recently installed a panel meter on a single phase load of 10 hp, 230 volt, FLA 55. My local supply house sold me a 0-75 amp meter, and 75-5 amp donut transformer. I installed these as I have a few in the past. The running load on my Fluke is 22 amps. However the meter only reads about 5 amps. The only thing I can figure is either a defect. or possibly the donut is to close to another load. Is anyone familar with these things. Thanks.