Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
Search
x28c256 memory
#hp8920b
¿ªÔÆÌåÓýHi! Yes, you can do that pretty easily. That's what I did prior to begin thinkering with calibration data on my 8920A... At a first glance it is just a block of bytes, but when comparing the content of the EEPROM with the cal data read back from the test set (using the program I posted on the forum some time ago), I was able to locate most of the records. It's however quite touchy because the format of data varies from integer of various length, fixed point floats of various formats and floats/doubles... Last but not least, a checksum is added in EEPROM after each record. No idea yet how it is calculated. So, apart from having a backup of your EEPROM just in case something bad happens, you'll not learn a lot from it... Regards, JF |
|
ok thank you jeff, unfortunately my instrument is not equipped with rs232 and I have the problem to make it start. start problem is because it gives me checksum error and I have not understood why.? ?so I would like to try to load on another new eprom with a safe working .bin or .hex file like yours that I understand you have read and archived with the checksum it generated. then I could see if it starts and then look for the reason why it is corrupted. if not it is a nuisance and if you can send it to me to do these tests.? ?I apologize and thank you. |
|
backing up the calibration EEPROM is always a good idea.? I typically do that when working on a unit.
You can get a boot up checksum error from a couple of places. Usually if it's the cal data than a unit will load a default file instead. It may be a firmware checksum failure ...on the 8920A those are ROM's that can be replaced. |
to navigate to use esc to dismiss