| Electronics > Repair |
| HP 3478A: How to read/write cal SRAM |
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| WaveyDipole:
--- Quote from: dfrederickson on June 13, 2017, 09:57:45 pm ---Sorry. Yes, the adapter will need a driver to interface to LabVIEW. It might be easier to just buy an adapter off eBay, like I did. --- End quote --- I had considered that option, but everything I have seen on there so far costs more than the meter did! Of course, if I had something compatible then I could try pigrew's program! |
| scuba31:
All, Thanks to everyone who contributed to (finally) solving this problem! I had never considered the "hidden GPIB command" possibility. I was approaching this from the perspective that electronics would need to be designed and built to interface with the 5101 IC inside the multimeter. I was just starting to lay out a prototype in Kicad when I decided to see if this had been solved in the 8 months since I last checked - and to my surprise, it has. ;D I have 3 of these HP3478A multimeters that I replaced the batteries using a torch solder iron. Using the Visual Basic program provided on this forum, here are the calibration constants that my 3 multimeters report out. Meter #1 @@@@CEFBB@BBNI@@ @@CDBBL@ANG@@@@@ CBAACLNIIIIIIGBC LEAKD@@@@@@BBBM@ NL@@@@@@@@@@@OO@ @@GHFBLMCELG@@@@ HEALONCLE@@@@@H@ EELDMM@@@@@A@E@@ MNL@@@@@A@ENCANG @@@@@A@DEEENK@@@ @@A@ELALN@@@@@@@ @D@N@NM@@@AABCC@ CCNO@@@@AACBE@AO B@@@@@@@@@@@OO@@ @GHFCMLMBKO@@@@@ @@@@@@OO@@@@@@@@ Meter #2 J@@@BIIB@@ALML@@ @@BIB@BABNM@@@@@ CB@@LNN@IIIIIEB@ LMLJFIIIIIIBOC@E K@@@@@@@@@@@@OOI IICEAADABELNIIIH @H@E@B@LMIIIIGI@ EBDBKNIIIIIH@E@O AKEIIIIII@EOENJB IIIIIH@EOCAKBIII IIH@EOEEJLIIIIIH @ELLOIN@@@@HBC@@ CON@@@@@@HC@B@ON C@@@@@@@@@@@OOII ICEABD@EBLN@@@@@ @@@@@@OO@@@@@@@@ Meter #3 O@@@AHIAEEC@MO@@ @@AGAEBMDMN@@@@@ BAEBEONAIIIIIEAD N@OJKIIIIIIADON@ JG@@@@@@@@@@@OOI IIA@BBL@NEL@IIII @A@EECCLJIIIIIA@ EDNEKEIIIIII@EDN LJFIIIIIH@ECCAKN IIIIII@ECD@KMIII III@ECNCK@IIIIIH @EMDCKAIIIIBBBDA CALLIIIIIBBDBELK G@@@@@@@@@@@OOII IA@BBE@CMLJ@@@@@ @@@@@@OO@@@@@@@@ |
| Squiddaddy:
Thanks pigrew!! I just downloaded your program and successfully read the SRAM from my 3478 meter. Has anyone tried to write their values back using your program yet? I am getting ready to try to replace the battery in my meter, and in case I lose my config, I'd like to know if it works. I guess I'm gun shy to try it yet. :) I don't like being the guinea pig. LOL Here are my SRAM values, in case someone is trying to analyze data between all of our posts. @@@@A@HBCM@MMG@@@@ACBBNENMFIIIII IBCNDAKAIIIIIABBAB@LJIIIIIGBCAAB LB@@@@@@@@@@@OO@@@DIGB@MLELKIIII CB@EC@MLAIIIIID@DDDOKC@@@@@@@ED@ COC@@@@@@@EBONMK@@@@@@@EB@@OH@@@ @@@@ECCLNH@@@@@@ALADMN@IIIIFGCDE EEKHIIIIIDCCDBCKO@@@@@@@@@@@OO@@ @CAICBLE@ML@@@@@@@@@@@OO@@@@@@@@ Thanks again to everyone involved in coming up with this solution to our problem!!!! |
| pigrew:
--- Quote from: Squiddaddy on September 07, 2017, 12:35:55 am ---Thanks pigrew!! I just downloaded your program and successfully read the SRAM from my 3478 meter. Has anyone tried to write their values back using your program yet? I am getting ready to try to replace the battery in my meter, and in case I lose my config, I'd like to know if it works. I guess I'm gun shy to try it yet. :) I don't like being the guinea pig. LOL Here are my SRAM values, in case someone is trying to analyze data between all of our posts. @@@@A@HBCM@MMG@@@@ACBBNENMFIIIII IBCNDAKAIIIIIABBAB@LJIIIIIGBCAAB LB@@@@@@@@@@@OO@@@DIGB@MLELKIIII CB@EC@MLAIIIIID@DDDOKC@@@@@@@ED@ COC@@@@@@@EBONMK@@@@@@@EB@@OH@@@ @@@@ECCLNH@@@@@@ALADMN@IIIIFGCDE EEKHIIIIIDCCDBCKO@@@@@@@@@@@OO@@ @CAICBLE@ML@@@@@@@@@@@OO@@@@@@@@ Thanks again to everyone involved in coming up with this solution to our problem!!!! --- End quote --- Well, I tested it out a while ago, but I think I had to fix a few issues I the code after that. I'm sure the command works, but there is a chance there are still bugs in my code. -Nathan |
| jca1955:
This has been a great discussion! For those interested, I have Matlab scripts to read and write a 3478A's calibration SRAM. More information can be found on these routines at my blog, here: http://k6jca.blogspot.com/2017/12/save-and-restore-hp-3478a-calibration.html If you don't have Matlab, the procedures are (hopefully) straight-forward enough for you to adapt to your language of choice. - Jeff P.S. If using these scripts, you will also need the Mathwork's "Instrument Control" toolbox. |
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