The microscopic relaxation parameters, activation energy and lifetime, are measured for the single‐and double‐dipolar systems KCl : Eu++and KCl : Eu++, Yb++using both ac bridge and ionic thermocurrent (ITC) techniques. The two methods are compared and contrasted. A theory is developed to calculate dielectric constant and loss tangent for the single and double systems from the measured ITC, and comparisons are made with bridge measurements. The theory of peak cleaning, used in the ITC technique, is also presented.