Error message "PHASE LOCK LOOP UNLOCKED" could be displayed, when the 4294A using an external ref. osc (opt.1D5 or other 10 MHz output) is ON.

The message is removed when any key of the front panel except [Preset]. In this case, the unit works properly. This message problem has been fixed by f/w 1.02 and above. Please install the latest f/w. The latest f/w is downloadable from Firmware Update page for the 4294A.