Why Does the Wavelength Calibration Fail but Optical Alignment Pass on the AQ6375?

Please clean the fiber used between the calibration output and the optical input.  

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Long Wavelength Optical Spectrum Analyzer AQ6375

Unique LONG wavelength range of 1200 to 2400 nm makes this the world's first and only OSA specifically designed for use in advance applications such as Carbon Monoxide (CO), Carbon Dioxide (CO2) gas detection and LIDAR.

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