The ripple voltage measurement is the amount of A.C. voltage measured at the ouoput terminals that go to the track. A high ripple voltage is very harmful to your train motors and to most D.C. accessories.

This chart shows the dramatic difference between the D.C. purity of Bridgewerks' power controllers and the best of several other controllers tested (the competitor in the chart below prints "pure D.C." on the top of their unit - note how incredibly inaccurate!) Bridgewerks would consider this competitor's test a dismal failure.

When Bridgewerks claims "pure D.C. power", we mean it!