Re: [volt-nuts] HP-3455A calibration

[Ludger . Lenzen]

I did it time ago.
Warmed up ~3 hours / Measure value with my 3548A.
Next trimmed to mid of trimmable range (pot to center).
Than trimmed (by shorting step by step) as close as possible to 10.000V.
/PeLuLe
 

> Gesendet: Sonntag, 19. November 2017 um 06:51 Uhr
> Von: "Jeremy Nichols" 
> An: volt-nuts@febo.com
> Betreff: [volt-nuts] HP-3455A calibration
>
> My new-to-me 3455A DVM (s/n 1622A06699) does not want to calibrate to the 10 
> Volt level although 1 Volt is fine. The 10V adjustment pot in the 11177B 
> reference assembly simply doesn't adjust far enough—I can get the reading 
> down to 10.00020 Volts but no lower.
> 
> Just for the heck of it, I picked up another reference assembly from an eBay 
> seller. It's an "A" assembly rather than the "B" the 3455 came with but it 
> works fine and I am able to calibrate both 1V and 10V. 
> 
> The reference assemblies have a set of jumpers for "coarse adjust" so it 
> should be possible to tweak the "B" version back into calibration. Does 
> anyone have experience doing this? The service manual just says "return to 
> the factory." It would be nice to hear from someone who has worked with these 
> things before I start messing with the jumpers.
> 
> Jeremy
> 
> Sent from my iPad 4
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Re: [volt-nuts] Fw: Datron 1281 / 1271 secret GPIB cmds for CALRAM-Readout

[Ludger . Lenzen]

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" 
> An: "Discussion of precise voltage measurement" 
> 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,  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" 
> > > An: "Discussion of precise voltage measurement" 
> > > 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,  wrote:
> > >
> > > >
> > > >
> > > > > Gesendet: Sonntag, 07. Februar 2016 um 18:30 Uhr
> > > > > Von: ludger.len...@gmx.de
> > > > > An: volt-nuts-boun...@febo.com
> > > > > Cc: "Adrian Bernhard" 
> > > > > 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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> > > > To unsubscribe, go to
> > > > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
> > > > and follow the instructions there.
> > > >
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> > > volt-nuts mailing list -- 

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

[Ludger . Lenzen]

> Gesendet: Sonntag, 07. Februar 2016 um 18:30 Uhr
> Von: ludger.len...@gmx.de
> An: volt-nuts-boun...@febo.com
> Cc: "Adrian Bernhard" 
> 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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[volt-nuts] Fw: Just uploaded to KO4BB: Datron 1281 User Manual & Service Manual

[Ludger . Lenzen]

volt-nuts@febo.com

> Gesendet: Sonntag, 07. Februar 2016 um 19:52 Uhr
> Von: ludger.len...@gmx.de
> An: volt-nuts , "VOLT NUTS" 
> Betreff: Just uploaded to KO4BB: Datron 1281 User Manual & Service Manual
>
> Hi folks,
> 
> as the owner of the Datron manuals copyright has stopped the business and has 
> given all docs and rigths to the "Internet Archive", I am now free to upload 
> some documents to Didier great site (KO4BB).
> I uploaded 3 files:
> 1. an optimzed/better version of user manual (with bookmarks & quick links)
> 2. HQ scan of the complete service manuals Vol1 (including drawings & 
> schematics)
> 3. HQ scan of the drawing out of service manual Vol2 (only drawings & 
> schematics)
> Hope it is of interest.
> 
> Remark: it's a lot of data (compession/zipping did just minor reduction thus 
> haven't done it).
> 
> BR
> PeLuLe
> 
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Re: [volt-nuts] Fw: Datron 1281 / 1271 secret GPIB cmds for CALRAM-Readout

[Ludger . Lenzen]

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" 
> An: "Discussion of precise voltage measurement" 
> 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,  wrote:
> 
> >
> >
> > > Gesendet: Sonntag, 07. Februar 2016 um 18:30 Uhr
> > > Von: ludger.len...@gmx.de
> > > An: volt-nuts-boun...@febo.com
> > > Cc: "Adrian Bernhard" 
> > > 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.
> >
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Re: [volt-nuts] Wavetek 1281

[Ludger . Lenzen]

I have send him a mail yesterday and aksed to take some pictures from inside.
BR
Ludger.

 
 

Gesendet: Donnerstag, 22. Oktober 2015 um 20:42 Uhr
Von: "Todd Micallef" 
An: "Discussion of precise voltage measurement" 
Betreff: Re: [volt-nuts] Wavetek 1281
The seller has posted more internal photos

Sent from my iPad

> On Oct 22, 2015, at 10:18, ludger.len...@gmx.de wrote:
>
> The pictures show error 9005, means "Serial Interface Error". This is the 
> typical error, if the Analog-Board is not installed.
>
> BR
> Ludger
>
>
>
> Gesendet: Donnerstag, 22. Oktober 2015 um 15:32 Uhr
> Von: "Electronics and Books via volt-nuts" 
> An: "Discussion of precise voltage measurement" 
> Betreff: [volt-nuts] Wavetek 1281
> There is a 1281 on ebay for only 350 USD
> http://www.ebay.com/itm/TM395-Wavetek-1281-Selfcal-Digital-Mutimeter-OPT-10-20-30-parts-only-/361413566578?
> Regards
> Frans
>
> i...@electronicsandbooks.com
> http://ElectronicsAndBooks.com[http://ElectronicsAndBooks.com][http://ElectronicsAndBooks.com[http://ElectronicsAndBooks.com]]
>
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Re: [volt-nuts] Wavetek 1281

[Ludger . Lenzen]

The pictures show error 9005, means "Serial Interface Error". This is the 
typical error, if the Analog-Board is not installed.
 
BR
Ludger
 
 

Gesendet: Donnerstag, 22. Oktober 2015 um 15:32 Uhr
Von: "Electronics and Books via volt-nuts" 
An: "Discussion of precise voltage measurement" 
Betreff: [volt-nuts] Wavetek 1281
There is a 1281 on ebay for only 350 USD
http://www.ebay.com/itm/TM395-Wavetek-1281-Selfcal-Digital-Mutimeter-OPT-10-20-30-parts-only-/361413566578?
 Regards
Frans

i...@electronicsandbooks.com
http://ElectronicsAndBooks.com[http://ElectronicsAndBooks.com]

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Re: [volt-nuts] Looking for Datron 4808 Service Manual

[Ludger . Lenzen]

Yepp, you are right.
Sorry for misleading.
PeLuLe
 
 

Gesendet: Dienstag, 15. September 2015 um 02:44 Uhr
Von: "David C. Partridge" 
An: "'Discussion of precise voltage measurement'" 
Betreff: Re: [volt-nuts] Looking for Datron 4808 Service Manual
Didier only seems to have the User Manual ...


Regards,
David Partridge
-Original Message-
From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of 
ludger.len...@gmx.de
Sent: 14 September 2015 23:34
To: volt-nuts@febo.com
Cc: volt-nuts@febo.com
Subject: Re: [volt-nuts] Looking for Datron 4808 Service Manual



You may look at KO4BB / Manual
http://www.ko4bb.com/getsimple/index.php?id=manuals

BR
PeLuLe

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Re: [volt-nuts] Looking for Datron 4808 Service Manual

[Ludger . Lenzen]

You may look at KO4BB / Manual
http://www.ko4bb.com/getsimple/index.php?id=manuals

BR
PeLuLe
 

Gesendet: Montag, 14. September 2015 um 21:25 Uhr
Von: "Joe D'Elia" 
An: volt-nuts@febo.com
Betreff: [volt-nuts] Looking for Datron 4808 Service Manual
Having recently acquired a Datron 4808 calibrator in need of restoration I
am now looking for a Service Manual (Vol 1 & 2) so that I can restore it to
pristine condition. If anybody has a PDF then I'd be very happy to get that,
alternatively if they have an actual manual I'd be happy to discuss price if
they want to sell it. Another possibility if someone has access to a manual
and is prepared to lend it to me I'll happily pay for shipping costs to me
and back. I missed out getting a manual in the recent Manuals Plus closeout
by half an hour, if you are the person who brought that copy then share with
your fellow volt-nuts, please!



Also has anyone any data on Option 70, the Wideband Voltage Source as the
unit has this bolted to the bottom but it needs to be connected to the main
unit via two cables, so any information on those cables would be most
welcome.



Thanks!



JoeD



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Re: [volt-nuts] volt-nuts Digest, Vol 70, Issue 16 HP-419

[Ludger . Lenzen]

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[volt-nuts] HP-419A Fluke 845A Mods - HP-419A HQ schematics on my shared link

[Ludger . Lenzen]

For all, working on a modification of the HP-419A:
I have uploaded to my HP-419A share point some high quality schematics, I have 
created for the modification process.
Link:
https://www.dropbox.com/sh/czd2uc3t0uvgggz/AAC--ykVziW9rSJkdg2J_-wZa?dl=0

Important note:
I created them using PaintNET on 64-bit Win7.
It may impossible to open them with the 32-bit Win7 version because of the 
memory restrictions.

I uploaded following files:
HP419A optimized original schematic complete (with doc).PDN  (the original 
amplifier schematic with some additional notes)
HP419A optimized original schematic complete.PDN (the original amplifier 
schematic)
HP419A optimized original schematic (3µV mode).PDN (amplifier schematic in the 
3µV mode)

Enjoy and feel free to comment.
BR
PeLuLe


 
 

Gesendet: Donnerstag, 25. Juni 2015 um 18:55 Uhr
Von: Dave M dgmin...@mediacombb.net
An: Discussion of precise voltage measurement volt-nuts@febo.com
Betreff: Re: [volt-nuts] HP-419A Fluke 845A Mods - shared link
Randy,
False alarm. When I downloaded the PDF again, it came through fine. The
file that I downloaded originally was only about 75K, not the 500K file that
I got the second time.

Sorry for the alarm.

Thanks again for sharing your work.
Dave M


Randy Evans wrote:
 Dave,

 I checked the HP-419A marked up schematic and I find it very clear and
 readable. Does anyone else have problem reading the pdf file?

 Thanks,

 Randy Evans

 On Wed, Jun 24, 2015 at 6:38 PM, Randy Evans
 randyevans2...@gmail.com wrote:

 Dave,

 I should have checked it. I will generate a higher resolution
 version tomorrow.

 Randy

 On Wed, Jun 24, 2015 at 10:49 AM, Dave M dgmin...@mediacombb.net
 wrote:

 Rady,
 Many thanks for the uploads.
 One issue... the marked-up PDF of the HP 419A schematic is virtually
 unreadable. Could you post a higher resolution image of the markup
 details? Don't really need the full schematic, just the areas where
 the connections to the new circuit are made.


 Thanks again,
 Dave M


 Randy Evans wrote:

 I have created a shared link to my working folder with the details
 of the HP-419A and Fluke 845A modifications. It is an in-process
 design so I suspect there may be many questions. Just send your
 questions and I will try to answer them. In the meantime, I will
 try to find time to clean up the design a bit.

 Hopefully I created the link correctly. Let me know if you have
 any issues with the link.

 https://www.dropbox.com/sh/7b3hsy0j0wq35hw/AABkmVptTwVu2EJFRqtSdAjya?dl=0


 Randy Evans AE6YG


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Re: [volt-nuts] HP-419A Fluke 845A Mods - shared link

[Ludger . Lenzen]

I had the same issue in the beginning (bad online reading with embedded PDF 
Reader).
Thus I downloaded the ZIP package and had no issues anymore.
Thus it seems to be an issue of the online reader, not caused by the files.

BR
PeLuLe
 
 

Gesendet: Donnerstag, 25. Juni 2015 um 11:08 Uhr
Von: Charles Steinmetz csteinm...@yandex.com
An: Discussion of precise voltage measurement volt-nuts@febo.com
Betreff: Re: [volt-nuts] HP-419A Fluke 845A Mods - shared link
Randy wrote:

I checked the HP-419A marked up schematic and I find it very clear and
readable. Does anyone else have problem reading the pdf file?

It's fine here -- an 11x17 file at 200 ppi (2196 x 3400 pixels),
546 kB on disk.

Perhaps the person with the low-res marked-up schematic got only the
preview and not the whole file? I suggest going back to the download
page and manually downloading just the marked-up schematic.

Best regards,

Charles



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Re: [volt-nuts] HP-419 and Fluke 845 Modifications

[Ludger . Lenzen]

Hi Randy,
 
I have just installed a 2GB dropbox (thanks for the tip, John).

That's the link:
https://www.dropbox.com/sh/czd2uc3t0uvgggz/AAC--ykVziW9rSJkdg2J_-wZa?dl=0
 
BR
Ludger
 
 

Gesendet: Sonntag, 21. Juni 2015 um 21:09 Uhr
Von: ludger.len...@gmx.de
An: volt-nuts@febo.com
Cc: Discussion of precise voltage measurement volt-nuts@febo.com, 
randyeva...@gmail.com, papa ludger.len...@gmx.de
Betreff: Aw: Re: [volt-nuts] HP-419 and Fluke 845 Modifications
Hi Randy,

I would be happy to go on with the modification (for the HP 419A).
Will also rout a PCB - plan to use EAGLE (V6) or maybe Altium Designer 14 (not 
yet used to).

Any information (ideas, sketches, notes, files...) is highly welcome.

I don't have an account for upload either, thus simply send to my private mail 
address: ludger.len...@gmx.de

For sure it will no fast-finished project, as my wrokload is high also. But 
promise to keep you tuned on the progress via your private mail: 
randyevans2...@gmail.com

BR
Ludger (PeLuLe)
 

Gesendet: Sonntag, 21. Juni 2015 um 05:21 Uhr
Von: Randy Evans randyevans2...@gmail.com
An: Discussion of precise voltage measurement volt-nuts@febo.com
Cc: randyeva...@gmail.com
Betreff: Re: [volt-nuts] HP-419 and Fluke 845 Modifications
Hi,

I have largely finished the design but it's designed to support the HP-419A
and Fluke 845A, with an isolation circuit for the HP-419A. Unfortunatley,
I have not had time to finish the implementation (PCB design and build) due
to a heavy work scdhedule over the last year, and its not getting any
better in the near term. I am more than willing to share the design with
you or anyone else that wants it. I can send a set of hand-drawn
schematics of the circuits to anyone who wnats - just send me an e-mail (I
don't have a web site to host the data - I should get one). I have a lot
of suppprting documentation such as LTSpice simulations, technical
articles, etc. also. I can anwer any questions anyone else has on the
design if needed.

Randy

On Fri, Jun 19, 2015 at 1:17 PM, ludger.len...@gmx.de wrote:

 Hi Randy, how is the modification of the HP419A ongoing?

 Still interrested and open to help/support.

 BR
 PeLuLe
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Re: [volt-nuts] HP-419 and Fluke 845 Modifications

[Ludger . Lenzen]

Hi Randy,

I would be happy to go on with the modification (for the HP 419A).
Will also rout a PCB - plan to use EAGLE (V6) or maybe Altium Designer 14 (not 
yet used to).

Any information (ideas, sketches, notes, files...) is highly welcome.

I don't have an account for upload either, thus simply send to my private mail 
address: ludger.len...@gmx.de

For sure it will no fast-finished project, as my wrokload is high also. But 
promise to keep you tuned on the progress via your private mail: 
randyevans2...@gmail.com

BR
Ludger (PeLuLe)
 

Gesendet: Sonntag, 21. Juni 2015 um 05:21 Uhr
Von: Randy Evans randyevans2...@gmail.com
An: Discussion of precise voltage measurement volt-nuts@febo.com
Cc: randyeva...@gmail.com
Betreff: Re: [volt-nuts] HP-419 and Fluke 845 Modifications
Hi,

I have largely finished the design but it's designed to support the HP-419A
and Fluke 845A, with an isolation circuit for the HP-419A. Unfortunatley,
I have not had time to finish the implementation (PCB design and build) due
to a heavy work scdhedule over the last year, and its not getting any
better in the near term. I am more than willing to share the design with
you or anyone else that wants it. I can send a set of hand-drawn
schematics of the circuits to anyone who wnats - just send me an e-mail (I
don't have a web site to host the data - I should get one). I have a lot
of suppprting documentation such as LTSpice simulations, technical
articles, etc. also. I can anwer any questions anyone else has on the
design if needed.

Randy

On Fri, Jun 19, 2015 at 1:17 PM, ludger.len...@gmx.de wrote:

 Hi Randy, how is the modification of the HP419A ongoing?

 Still interrested and open to help/support.

 BR
 PeLuLe
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Re: [volt-nuts] Datron 1271 AC Option

[Ludger . Lenzen]

Hi Greg,

Yes, I am open to sell it.

I guess, 350 EURO plus shipment cost is a fair price.
It would come with the required cables, shielding plate and the srews to mount.
I did a short function test in my 1281 and got plausible values.
So I will give also a DOA guarantee with cash-back, if you take shipment cost 
for the return.

Installation is not difficult and need a few minutes. But requires a 
calibration.
The 1271 service manual is available online at KO4BB.

BR
PeLuLe
 

Gesendet: Samstag, 20. Juni 2015 um 21:36 Uhr
Von: Greg Welby g...@networkinggurus.com
An: volt-nuts@febo.com volt-nuts@febo.com
Betreff: Re: [volt-nuts] Datron 1271 AC Option
Would you sell the spare Option 10 and what would you want for this board. I 
have purchase a 1271 and would like to get this option to make it a complete 
meter.

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Re: [volt-nuts] Datron 1271 AC Option

[Ludger . Lenzen]

I have one spare (Germany).
The AC option is a board with shields and cables. Simple to plug-in and to 
mount at the bottom of the system.
Same as for the current option board.
The 1271/81 detects it when the function is activated.
There is no special requirement or matched version, but for sure you need to 
calibrate it.

BR
PeLuLe
 
 

Gesendet: Mittwoch, 10. Juni 2015 um 17:38 Uhr
Von: Greg Welby g...@networkinggurus.com
An: volt-nuts@febo.com volt-nuts@febo.com
Betreff: [volt-nuts] Datron 1271 AC Option
Does anyone know where I can find the AC option 10/12 board for the Datron 
1271. Is it as simple as plugging it in or do you need a matched version with 
hardware version?


Greg Welby
(905) 891-0050

www.NetworkingGurus.com[http://www.NetworkingGurus.com]http://www.NetworkingGurus.com[http://www.NetworkingGurus.com]
[Signature]

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[volt-nuts] Datron 1281 cal ram data backup

[Ludger . Lenzen]

Note: I have also posted at EEVBLOG forum.
In my Datron 1281 (8.5 digit) bench DMM it seems, some of the electrolytics 
haved aged and need to be replace. I like to save the CAL-RAM content for 
security before working on (A backup is a good idea anyhow, if the battery 
drops).
Does anyone know how to do (is there maybe a GPIB dump possible like for the 
HP3458A)?
For sure it is possible to wire an LOGIC ANALYZER to the RAM and read out to 
file. But this is a risky job and my damage the content by accident. Thus I 
like to use another more secure method.

 

Gesendet: Dienstag, 20. Januar 2015 um 07:16 Uhr
Von: Mark Sims hol...@hotmail.com
An: volt-nuts@febo.com volt-nuts@febo.com
Betreff: [volt-nuts] HP3458A cal ram data dumper program
John Miles has included my HP-3458A cal ram data dumper program in the latest 
release of his excellent GPIB Toolkit package. You can download it from the 
KE5FX web site. The released version produces the formatted listing of the 
various cal RAM values in its output (it is the same version of the data dumper 
that I put up on tinyupload.com).
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Re: [volt-nuts] Design Spark PCB Design Package

[Ludger . Lenzen]

I had same experiance with DS, even it is free, it not quite professional to 
use.
I checked several free available PCB programs. I would recommend KiCAD, but the 
free version of EAGLE and the free German program Target 3001 (actual v1.7) I 
can also recommend.
 
BR
Ludger Lenzen

Gesendet: Montag, 05. Januar 2015 um 17:23 Uhr
Von: David C. Partridge david.partri...@perdrix.co.uk
An: 'Discussion of precise voltage measurement' volt-nuts@febo.com
Betreff: Re: [volt-nuts] Design Spark PCB Design Package
When I tried Design Spark PCB I wasn't impressed, though I'm told it has got 
better in the intervening year or so.

An example: most PCB design packages put down multi opamps/logic chips as 
individual pieces with 1 gate/opamp per piece (e.g. U16A, U16B, U16C, U16D), 
but DS PCB placed a single glom of all four opamps in a rectangular lump with 
all the pins and I had to sort out the mess. When I complained I was told - 
well it's easy to design your own component/footprint/package to do it your way 
- but I don't wan't to do that sort of basic stuff.

That said I use Multisim/Ultiboard, and despair over Ultiboard's autorouting - 
it doesn't seem to understand that a straight line is the shortest route 
between two pins that have the same X or Y coordinates, and regularly fails to 
route when there is a blindingly obvious route (same layer, no obstructions 
etc.) that won't break any design rules.

Regards,
David Partridge

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Re: [volt-nuts] HP-419 and Fluke 845 Modifications

[Ludger . Lenzen]

Hi Randy,

I have an HP-419A (ser# 948A-06384, seems to be one of the latest revisions 
~198x)
I refurbished myself including battery pack (NMiH) and it works not bad.
Just noise in the highest sensivity range isn't sufficiant.

I have a spare HP-419A (ser# 543-00149, one of the olderst revisions ~196x)with 
defekt NEON choppers.
That I resevered for your announced modifications.
I also have an acceptable equipped lab (including EAGLE layout sw V4 
[proffessional edition]  V6 [limited edition].
So if you need some support to reduce your work load, just give me a note.
I am happy to help.

BR
PeLuLe
 
 

Gesendet: Donnerstag, 11. Dezember 2014 um 02:50 Uhr
Von: Randy Evans randyevans2...@gmail.com
An: Discussion of precise voltage measurement volt-nuts@febo.com
Betreff: Re: [volt-nuts] HP-419 and Fluke 845 Modifications
Stan,

I working for a daughterboard design. I will be using parts of the
existing circuitry and I am not worried about maintaining purity. I just
want a functioning nullmeter.

Randy

On Tue, Dec 9, 2014 at 9:25 PM, Stan Katz stan.katz...@gmail.com wrote:

 Hi Randy,

 I have a very pedestrian and naive question regarding the fab of the
 chopper eliminator board for the HP419A. Is it your intention to replace
 the A4 board with a board containing your new design? If so, you have to
 keep in mind the A4 board is a whopping .173 thick. Expresspcb seems to
 only have one thickness in their fab of .062. I'm sure that wont mate well
 with the existing connector. There are other fab houses that can provide
 boards as thick as .125 stateside (sunstone.com), or pcbcart.com China
 (.126). Even using these other fabs leaves almost 50 mil short of the
 original A4 thickness. Maybe the connector can make up the 50 mil
 shortfall? If this is just a 2-sided board, you could split the layers onto
 two circuit boards with thicknesses that come close to the original A4
 board. These boards would have to be epoxied together by the end user.
 In any event, you may not get by using Expresspcb since two of their boards
 combined still leaves that 50 mil shortfall.

 All of the above is easily dismissed if you intend to mount a daughterboard
 onto the A4, cut the traces on the A4 down near the connector, and then
 wiring the daughter board onto the trace remnants still running to the
 connector. The only downside would be no resale to a purist who wants to
 run with the David Wise HP H11 linear optocoupler/photochopper replacement
 (see HP yahoo group for HP740b ).

 Just curious,
 Stan

 On Wed, Nov 26, 2014 at 12:18 PM, Randy Evans randyevans2...@gmail.com
 wrote:

  I have finished the design and analysis (LTSpice) and I am preparing the
  BOM and doing a PCB layout now (ExpressPCB). I am hoping to finish the
  work over the Thanksgiving holidays but I wanted to see Dallas's 845A
  modifications before ordering parts and pulling the plug on PCB fab first
  but it hasn't shown up on K04BB's site yet (still in the upload section).
 
  Randy
 
  On Wed, Nov 26, 2014 at 4:06 AM, ludger.len...@gmx.de wrote:
 
   Hi Randy,
  
   did you finish the HP-419A modification with a modern chopper amp?
  
   I have to refurbish my HP-419A so it would make sense to replace the
   optical chopper. Any help or made expericance would perfect.
  
   BR
   Ludger / PeLuLe
  
   *Gesendet:* Samstag, 09. August 2014 um 03:23 Uhr
   *Von:* Randy Evans randyevans2...@gmail.com
   *An:* Discussion of precise voltage measurement volt-nuts@febo.com
   *Betreff:* Re: [volt-nuts] HP-419 and Fluke 845 Modifications
   For those interested, I have largely finished the design of the HP-419A
   modifications to replace the current active circuits with a more modern
   chopper amp; e.g., LTC2054. The LTSpice analysis shows the circuit
 draws
   0.3 mA at full scale meter readings using a single 6V battery. I think
 I
   will use a 6V 225mAH NiCad rechargeable battery (because I have some)
  that
   should last many many hours on one charge. I am still working out the
   board layout and unit mods but the circuit is extremely simple and will
  use
   all the existing range and mode switching circuits. The circuit should
   also work for the Fluke 845 also. Keep tuned.
  
   Randy
  
  
   On Mon, Aug 4, 2014 at 10:05 AM, Dave M dgmin...@mediacombb.net
 wrote:
  
From: Randy Evans randyevans2...@gmail.com
   
   
I am looking at modifying my (defective) HP419A and Fluke 845A Null
meters
using the LTC2054 zero drift op amp. I am planning on using a single
4.2 V
Lithium Ion battery to power them (no AC input required and may not
include, TBD). The LTC2054 has a very low bias current of typically
1pA at
room temp and the bias plots vs. temp show no appreciable increase
until
about 50C. Conceptually, it looks pretty straight forward and, based
on my
Fluke 887A modifications, likely will be very stable.
   
Since this is a very astute group, does anyone have any comments on
the

[volt-nuts] Datron 1281 calibration enable key

[Ludger . Lenzen]

I am searching for the calibration enable key for my Datron 1281.
At EBAY one key for the Wavetek 4808 Calibrator is offered.
 
Does anybody know if this key fits also to the Datron 1281?
 
Thanks for Help.
 
PeLuLe / Germany
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[volt-nuts] Does the Wavetek 4808 Calibration Enable Key fit to the Daltron 1281

[Ludger . Lenzen]

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Re: [volt-nuts] HP-419 and Fluke 845 Modifications

[Ludger . Lenzen]

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