The Model CDN10K AF Series are coupling/decoupling networks to couple common mode signals onto unscreened un-balanced wires. Models exist for two and four cables. The networks are designed to meet the NAMUR NE21 standard requirements. Calibration adapter sets (set of two adapters for AE and EUT ports) are required for calibration of these networks. 150-50 ohm adapter set (CR00100CD, set of 2) is available for these networks.