Accurate (2 parts in 107) inductive voltage divider for 20-200 Hz

The paper gives the design approach followed for, and the design details of, a 3-decade inductive voltage divider which will realise any 3-digit output/input ratio between 0.001:1 and 0.999:1 to an accuracy of within 2 parts in 107, or better, over the frequency range 20¿200Hz. The measurement technique used to establish the errors of the separate decades is described, and it is shown how these can be combined to give the overall error for any ratio setting. It is also shown how the overall output impedance of a multidecade divider can be calculated for any ratio setting from the knowledge of the resistance and leakage inductance per section of the separate decades. A method of compensating for the errors produced by internal admittance loading is also given.