The dual interface module is used to connect optical heads ( Keysight 8162x ) to the mainframes 8163A/B, 8164A/B or 8166A/B
Following optical heads are used with these interfaces:
81620B Si, +10dBm to -90dBm
81623B Ge, +10dBm to -80dBm
81624B 5mm InGaAs, +10dBm to -90dBm
81626B InGaAs, +27 dBm to - 70 dBm
81628B InGaAs, +40 dBm to - 60 dBm
HP / Agilent 81619A