Thanks for the link, Todd. It's a great site, I didn't find, even I looked for it. I regular check xDevs for interesting project.
I have looked to the page and found a minor errors I like to note: The "Datron 1281 Calibration and service manual, Volume 1, Issue 1, July 1989" in fact is the complete SM (Vol1 and Vol2), I know as I have uploaded to KO4BB myself :-) My firmware is: v3.12, 05/11/96. I have placed the ROM files to a Dropbox folder. On the site is mentioned, you are looking for the specs of the DC405E2 (VFD 1x40 DOT Matrix Display). I could manage to get the original spec from ITRON service some years ago (I am a good customer). I have optimized and added some useful information. I dropped to the Dropbox also. I had the plan for a "Datron 1281 DC4052 replacement". Mine was broken on shipping. I have added a picture of latest state of project. It's on hold, as I got a complete Display Assembly and had no need for anymore. I will keep the Dropbox for one week, than I will delete as I need the space for a joined project. Link: https://www.dropbox.com/sh/rxeb86eq9m35tyu/AADwDNeCYQWp4RSZ2rVQ3y-ua?dl=0 BR PeLuLe > Gesendet: Montag, 08. Februar 2016 um 00:56 Uhr > Von: "Todd Micallef" <tmical...@gmail.com> > An: "Discussion of precise voltage measurement" <volt-nuts@febo.com> > Betreff: Re: [volt-nuts] Fw: Datron 1281 / 1271 secret GPIB cmds for > CALRAM-Readout > > https://xdevs.com/fix/d1281/ > > > > On Sun, Feb 7, 2016 at 6:43 PM, <ludger.len...@gmx.de> wrote: > > > Hi Todd, > > have tried to find the information @ xDevs. No luck. > > Is there a link you can share? > > > > BR > > PeLuLe > > > > > > > Gesendet: Sonntag, 07. Februar 2016 um 21:59 Uhr > > > Von: "Todd Micallef" <tmical...@gmail.com> > > > An: "Discussion of precise voltage measurement" <volt-nuts@febo.com> > > > Betreff: Re: [volt-nuts] Fw: Datron 1281 / 1271 secret GPIB cmds for > > CALRAM-Readout > > > > > > PeLuLe, > > > > > > I am currently working on two 1281's. If you have anything you would like > > > me to try, let me know. I am certain my cal constants are not good on one > > > of them. The battery was just changed a few days ago and it appears to be > > > the original from '87. I also had some intermittent NVRAM errors. > > > > > > Replacing caps worked for the first 1281 and cleared the DCV 2182 error. > > > The project is a WIP and everything is being documented on xDevs. > > > > > > Also, please post your FW versions. Both of mine are at different revs > > and > > > I would like to know the different versions from Datron/Wavetek > > > > > > On Sun, Feb 7, 2016 at 2:33 PM, <ludger.len...@gmx.de> wrote: > > > > > > > > > > > > > > > > Gesendet: Sonntag, 07. Februar 2016 um 18:30 Uhr > > > > > Von: ludger.len...@gmx.de > > > > > An: volt-nuts-boun...@febo.com > > > > > Cc: "Adrian Bernhard" <acb...@gmx.de> > > > > > Betreff: Datron 1281 / 1271 secret GPIB cmds for CALRAM-Readout > > > > > > > > > > Hi volt-nuts > > > > > > > > > > I like to backup the Datron 1281 CAL RAM data. Mine need to be > > > > refurbished (caps replacement, case cleaning...) > > > > > The 1281 quite good in cal (~3ppm difference to my 3458A which had > > last > > > > cal 2014/OCT), which I don't want to risk. > > > > > In any case this migh a helful knowledge for all of us. > > > > > > > > > > I am lucky having another 1281 "for part" without a Display- and > > > > DC-Assembly but a wokring Digital Board. > > > > > I dumped the ROM to have a deep look into the GPIB commands and > > searched > > > > for potential undocumented existing > > > > > (like it was done for the 3458A already). > > > > > > > > > > I found following, in the service and user manual not documented, > > > > potential commands (?): > > > > > RAM = may a RAM command, seems to be the best chance > > > > > PRIM = may a subfunction of RAM for primary RAM > > > > > SECN = may a subfunction of RAM for secondary RAM > > > > > > > > > > IPZ = no glue yet > > > > > > > > > > YEUK = command to set something, no glue yet about function > > > > > YEUK? = query comand of the YEUK command > > > > > > > > > > CALISS? = seems to be a qery for calibration purpose > > > > > > > > > > To (hopefully) save some of the allways limited private time, I would > > > > like to aks, if some of you have seen that commands (?) or have more > > > > details on them. They may used at other Daltron tools also... > > > > > Next I will start with the debugging of the unknown remaining > > commands > > > > on processor board level. > > > > > > > > > > Thanks for help already in advance. > > > > > BR > > > > > PeLuLe > > > > > > > > > > > > > > > > > > > _______________________________________________ > > > > volt-nuts mailing list -- volt-nuts@febo.com > > > > To unsubscribe, go to > > > > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > > > > and follow the instructions there. > > > > > > > _______________________________________________ > > > volt-nuts mailing list -- volt-nuts@febo.com > > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > > > and follow the instructions there. > > > > > _______________________________________________ > > volt-nuts mailing list -- volt-nuts@febo.com > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > > and follow the instructions there. > > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.