Electronics > Repair

HP 3478A: How to read/write cal SRAM

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WaveyDipole:
Thanks. At least it seems one does exist. Unfortunately my version of Labview/NI/IVI does not appear to be supported. It seems to be Labview 2012 SP1f3 version 12.0.1 and came supplied with the Rigol Oscilloscope. Would there not also have to be a driver for the GPIB adapter?

dfrederickson:
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.

WaveyDipole:
I have uploaded my HP3478A control program code to GitHub. This is the first time I have ever done that!

https://github.com/WaveyCode/HPRDMM

At present it does not contain the code for reading the calibration data as I'm having lots of trouble acquiring it from the meter. I suspect this is down to the Arduino adapter, but I'm not sure. I've been experimenting with a python script and got something that resembles the output I should be getting but its not 256bytes long and contains the phrase 'CR or LF inserted' which is an error message embedded in the adapter code. Sorry, but I don't have an NI capable GPIB adapter to test with.

iainwhite:
I have been playing with Pigrew's windows C# program   (from  https://github.com/pigrew/HP3478Ctrl )

I forked my own version at  https://github.com/iainkwhite/HP3478Ctrl
and after tinkering a bit, managed to read my cal data.

Here is what I got (formatted to lines of 16 bytes)


--- Code: ---@@@@BAIBMLOMKL@@
@@BBBLDNBMI@@@@@
BBMMMAMCIIIIIEBM
@MLJEIIIIIIBMCMA
JI@@@@@@@@@@@OO@
@@FFCADAACNFIIIH
GIALLEAJMIIIIHH@
ECC@L@IIIIIHALL@
AK@IIIIII@EDEMJN
IIIIIH@EDCDKJIII
IIIALL@LJDIIIIII
@EDBEKI@@@BFBCLC
A@NB@@@@BFCLEAEM
M@@@@@@@@@@@OO@@
@FFCBDBBCNC@@@@@
@@@@@@OO@@@@@@@@
--- End code ---


Edit: add screenshot


pigrew:

--- Quote from: iainwhite on June 29, 2017, 04:08:55 pm ---I have been playing with Pigrew's windows C# program   (from  https://github.com/pigrew/HP3478Ctrl )

I forked my own version at  https://github.com/iainkwhite/HP3478Ctrl
and after tinkering a bit, managed to read my cal data.

--- End quote ---

Thanks for the changes, I've merged most of the changes back into my branch, and posted a new binary:
https://github.com/pigrew/HP3478Ctrl/releases/tag/v0.20170630

-Nathan

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