Hey! Today I received a HP 8592A spectrum analyzer I got pretty cheap on ebay. Seems to have survived the long shipping.
On first boot it said "ADC-GND FAIL". Not sure what this was about, pressed the "Preset" button and the error disappeared.
The spectrum analyzer _seems_ to be working fine as far as I can tell. Attenuator seems to work etc.
The problem is that when I try to run the calibration routines. With the "CAL FREQ" routine it's doing its thing for 20-30s and clicking away on the relays but the routine ends up with "CAL: SPAN SENS FAIL". The "CAL AMPL" routine also fails, it just straight up says cal signal not found (but there it is), but this might be related to the other routine failing.
I found this about the error:
CAL: SPAN SENS FAIL
During the CAL FREQ self-calibration routine the main-coil span-sensitivity adjustment routine has failed, indicating that the spans controlled by the main coil (LO spans greater than 10 MHz) are not working correctly. The span-sensitivity adjustment routine checks for three displayed signals: 0 Hz, 300 MHz, and 600 MHz. If three signals are not found in a 750 MHz span, the error message is displayed.
Does anyone have any ideas what could be wrong? I haven't popped the hood open yet, maybe it is something obvious...