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8510C Error: Source failure RF Unlocked

Question asked by lightwith on Jul 30, 2009
Latest reply on Aug 6, 2009 by RayH
I use 8510C and 85102B IF/Detector with 83651A 45MHz-50GHz sweeper and 8517A test set.
I was measuring S parameter. The calibration and measurement are fine, but the error message of ("Source 1 failure RF Unlocked") pops out continuously.
The setting on the 8510C is -13dBm at 500MHz and the power slope is 0.7 dB/GHz

The manual of 8510C and 83651A couldn't provide me information to solve this problem.

Anyone know how to fix this error??  Thanks