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

Dave M dgminala at mediacombb.net
Fri Jun 26 18:22:06 EDT 2015

The .PDN image files can be opened on Win XP, Win7 & Win8 with Irfanview if 
you download and install the plugin package from the Irfanview web site.  I 
use XP 32-bit, and the files opened just fine for me.

Dave M

Ludger.Lenzen at gmx.de wrote:
> 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" <dgminala at mediacombb.net>
> An: "Discussion of precise voltage measurement" <volt-nuts at 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
>> <randyevans2688 at 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 <dgminala at 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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