MN574 – Pulse Transformers – Manutech Inc. magnetic components, transformers, inductors, offshore electronic assembly, manufacturing,offshore facilities Features. Turns ratio primary to secondary 1: 1.5; DC resistance between 1 to 2 is 1.5 Ohm max. Inductance L between 3 to 4 is 7 mH min. Leakage Inductance between 1 to 2 with 3 and 4 shorted is 6 µH max.