概要（Overview）

The Keysight 81618A is a single-channel interface module designed to seamlessly integrate with all 8162x series optical heads. It's compatible with the 8163, 8164, and 8166 series mainframes, ensuring versatile use across a range of devices. The module supports various optical head models, including the 81620B Silicon, 81623B Germanium, 81624B 5mm InGaAs, 81626B InGaAs, and 81628B InGaAs, which can measure optical power across a spectrum from +40 dBm down to -90 dBm depending on the model. This interface module is vital for precise optical measurements and connectivity in optical testing setups.