概要（Overview）

The 81628B is an optical power head designed for precise high power measurements, accommodating input levels up to +40 dBm thanks to its integrating sphere with wavelength-specific calibration. It features an 8 mm aperture for wide beam entry, a detachable heatsink for managing heat above 2W, and various fiber adapter options. Advanced functionalities include adjustable averaging time, auto power ranging, and the ability to log up to 20,000 samples. It's compatible with 816x mainframes via single or dual-channel interface modules and is optimized for use with threaded adapters, though it can also accept open beams or custom holders.