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The HP 81525A is an optical head that connects to the 81533A or 81533B which is a plug-in module that fits the 8153A and 8163 and 8166 Agilent/HP series mainframe. The 81525A optical head is made of a 5mm InGaAs sensor element and covers the range of 800-1650nm wavelengths. Various connector interfaces are available for that head.
The 81525A High Power Optical Head interfaces to lightwave multimeter mainframes through 81533B optical head interface module. This is a high-power optical head that measures power up to +27 dBm.