The Radaiantech UFO series is a compact, cost-effective, plug-and-play Optical Time-domain Reflectometer(OTDR) unit, designed for full-range fiber fault detection. It is ideal for optical fiber installation, maintenance, field construction, and other on-site fault-location analysis.   As a USB peripheral, UFO-200 is the best choice of OTDR to integrate with remote optical monitoring systems. The OTDR unit is designed as a green PC peripheral compatible with Windows 98, 2000 or above. The application program (AP) sends OTDR command from the computer to the unit and gets data back through USB connection.   The USB OTDR gets power from the USB port and an internal rechargeable Li-ion battery. The OTDR unit injects the laser pulse into the fiber under test and picks up scattered and reflected optical signals by an avalanche photodiode (APD). The unit also controls all related timing and data acquisition processes.The AP consists of three windows.   The Event Handling window (default) allows for parameter setting, measurement data storage and event analysis processing. The Event Mapping window provides mapping of a measured trace to a predefined landmark table, and subsequently the actual fault location can be shown. The Meter window provides laser light source and light detection functions.