Gents, I'm showing an error code '625' in my HP 33120A. I use it only for analog testing and repair. Do I need to be concerned about this error code ? Thanks, Jack; K4LrH
Agilent 33120A 15 MHz Function / Arbitrary Waveform Generator User Guide (English, 312 pages) https://www.keysight.com/upload/cmc_upload/All/6C0633120A_USERSGUIDE_ENGLISH.pdf Chapter 5 : Error Messages (page 228) Self-Test Errors The following errors indicate failures that may occur during a Self-Test. Refer to the Service Guide for more information. == Error 625 : I/O processor does not respond == Agilent 33120A 15 MHz Function / Arbitrary Waveform Generator Service Guide (English, 146 pages ) https://ese.wustl.edu/undergraduate/Documents/lab_support/HP_33120A_Function_Generator_Service.pdf
As long as it's functioning it should be OK. Thanks to 'GB, the service manual may be consulted. On page 81, it tells us that Self-Test Error Message 625 is "I/O Processor Not Responding". The function of the I/O processor is described on page 85; "The ground reference section uses a processor configured as a slave to the main CPU. This processor establishes external I/O communication with the main CPU through a bi-directional, optically isolated, serial communications link. The earth referenced processor controls low-level GPIB (IEEE-488) and RS-232 interface operation. The ground referenced, rear panel external trigger input uses a dedicated optical isolator to couple a trigger signal to the main CPU in the floating section". You are most probably not using GPIB or the like so there should be no problem.
