This procedure explains how to use a 4100‑series OTDR module in a T‑BERD/MTS‑5800 as an Optical Power Meter to measure optical power levels. When equipped with the required software and power meter option, the OTDR can operate as either an OPM or light source, though not simultaneously. The process requires proper fiber inspection and cleaning tools, a reference patch cord matched to the OTDR port and fiber under test, and an optical coupler for connecting the reference cable. The quick card outlines equipment requirements and the steps needed to set up the module and perform accurate optical power measurements.

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