Agilent Technologies ENA Series User Manual page 631

Troubleshooting
Error Messages
Ensure the connection of the power sensor.
75 Valid signal generator not found
No valid external signal source is connected.
This error occurs when the specified type of external signal source is not connected to the
specified GPIB address, though the control of the external signal source is enabled
(SENS:OFFS:LOC:STAT ON and SENS:OFFS:LOC:CONT ON).
It also occurs when USB/GPIB interface is set but not connected.
Ensure the external signal source and the connection of USB/GPIB interface.
Appendix B 625