[volt-nuts] Fw: Datron 1281 / 1271 secret GPIB cmds for CALRAM-Readout

[Ludger.Lenzen at gmx.de]

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" <tmicallef at gmail.com>
> An: "Discussion of precise voltage measurement" <volt-nuts at 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.Lenzen at 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" <tmicallef at gmail.com>
> > > An: "Discussion of precise voltage measurement" <volt-nuts at 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.Lenzen at gmx.de> wrote:
> > >
> > > >
> > > >
> > > > > Gesendet: Sonntag, 07. Februar 2016 um 18:30 Uhr
> > > > > Von: Ludger.Lenzen at gmx.de
> > > > > An: volt-nuts-bounces at febo.com
> > > > > Cc: "Adrian Bernhard" <acbern at 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
> > > > >
> > > > >
> > > > >
> > > > _______________________________________________
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