In this work we describe a simple measurement system that allows us to obtain the characteristic parameters (the ideality factorn, the saturation currentIs, and the series resistanceR), for nonideal Schottky barrier diodes with high series resistance. The principal features of this new system are: analog processing of the measured signal (in order to avoid large errors coming from digital differentiation) and the easy interpretation of the shape of theI0‐VAcurves obtained.