What is an Ultra isolation Transformer?

How to test / inspect an Ultra isolation Transformer?What is an Ultra isolation Transformer?
Usually these are made with two electrostatic shields between the primary windings and the secondary windings, and are connected to input ground for the first, and floating ground for the second.





Test it the way you would a normal transformer, and add a test for capacitance between secondary and primary windings, with the shields connected to the guard of the capacitance meter. You should read a very low capacitance. Then test each shield individually, then test capacitance between the shields.





.What is an Ultra isolation Transformer?
This is the first time I am hearing about such a device.





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