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Hi Razvan,
When you have a 5313xA firmware 3403, I think by default the EEPROM includes the configuration for the 3GHz option. So, only the hardware option would be missing. When I bought my hp53132A several years ago, I installed the 3GHz option only later. After installing the PCB, the 53132A worked normally without having to modify the EEPROM or adjust the scale. Since then, I have acquired another meter, Agilent 53132A (newer, firmware 3944); I transferred the 3GHz option to this one without problems and the frequency displayed was normal, without having to put a compensation scale or modify the EEPROM. Hence my conclusion that the 3GHz option is activated in the EEPROM by default, but it obviously requires the hardware part to be added. The 124 option (12.4GHz), the divider is 512 instead of 128 for 3GHz, then you must put a scale of 4, to multiply the result by 4 to display the correct frequency. By modifying the EEPROM as suggested in the document, I should be able to make the 12.4GHz option work without changing the scale. It's quite easy to simply activate the scale at 4. But in my opinion, it may be a lot of work and a risk to remove the EEPROM, put a socket (restricted place on the PCB), and make modifications in the EEPROM. Furthermore, on the PCB of my hp53132A, I cannot find the R334 resistor cited in the document. In short, I will look at the implications of making this change, and I will take the opportunity to do a firmware update, if I decide to move forward with this little project. I need to check the calibration procedure first. Yves Envoyé : 6 mai 2024 04:28 ? : [email protected] Objet : Re: [HP-Agilent-Keysight-equipment] Another 3GHz 53132-68003 Chanel 3 option design for the 53131A and 53132A Hello Yves, I was thinking the same that something is not right in the firmware. I found the same thread on EEVblog late last night. For me it is more work to be done since my 53181A and 53132A both have no option so I need to maybe install the zero ohm R334 resistor and also the U14 socket. When I will have time I will open my counters and check the motherboards first. Would be great news if you can confirm this info and the cloned 12.4GHz work by default without any scale adjustment. There is also an 18GHz version from the same seller on eBay and I wonder that one how it would work since HP never had 18GHz version released. They say you need the 3GHz option already installed and working and after that you need to set scale to 4.0 to have the 18GHz option working correctly. Maybe the hex values modification in firmware tells it what divider or IF to use so maybe other values (or the same values as 12GHz) will make it working fine without scale adjustment. Thanks, Razvan |
