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How to resolved the error log message :59,LO1 VCO unlocked from N9918A?

Question asked by sritharan on Aug 22, 2018
Latest reply on Aug 27, 2018 by am95405

Encounter error prompt (59, LO1 VCO unlocked) after operating the N9918A to measure return loss of broadband antenna.

Enclosed is screenshot of error log .