RF eCal Module, 4 Ports, 3.5mm 300kHz-20GHz. Option: 010 = 4 female 3.5mm connectors. Unit sold with a valid calibration certificate and with 6 months warranty. The Agilent (now Keysight) N4433A is a RF Electronic Calibration (eCal) Module designed for fast full 3 or 4 port calibration with a single connection. ECal offers fast, easy and accurate calibration for network analyzers and takes less than half time and number of connections using eCal versus mechanical cal kits. It is comparable between electronic and mechanical methods. Frequency range: 300 kHz to 20 GHz Number of Ports: 4 Input power max.:+7 dBm DC level applied to test port max.: +/- 3 V Damage level: +20 dBm Standard 3.5 mm (f) connectors Option 010 = 4 female 3.5 mm Connectors Fast full three or four port calibration with a single connection NIST traceable accuracy calibration Reduced connector wear USB interface for direct control with PNA and ENA series of network analyzers Reliable solid-state switching Mixed 3.5 mm male/female connectors option available