  The Laboratory of Metrology in Electrical Standards of Inmetro (Lampe) has
built, in 2010, a transformer which is able to perform inductive voltage
divider ratio calibrations using the bootstrap method. This transformer was
idealized according to the design adopted at Physikalisch-Technische
Bundesanstalt (PTB), and has very similiar characteristics to that system.
Lampe's bootstrap system is not yet in operation, and DIT calibrations are
presently being carried according to a triangular set of measurements involving
standard capacitors. This method, though, has uncertanties limited to a few
parts in 1E6; the primary objective of Lampe's bootstrap system project is to
achieve uncertanties at least 10 times smaller than this.
