When sending the direct I/O command ":CALibration:IQ:FULL" using Vee, the instrument starts its I/Q calibration. But after 2 -3 % it aborts and gives the error message: 517, Calibration failure; Cal aborted by user. However, the only command sent is the ":CALibration:IQ:FULL". The command is sent using LAN direct I/O. Other commands work fine. Any hints??