Sam Reaves | 27 Jun 04:23 2015
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Re: volt-nuts Digest, Vol 70, Issue 16

Randy,

When I try to download the 500K PDF it shows up as 162K and will not open.

Sam

On Fri, Jun 26, 2015 at 12:00 PM, <volt-nuts-request@...> wrote:

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>    1. Re: HP-419A Fluke 845A Mods - shared link (Dave M)
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(Continue reading)

Charles Steinmetz | 25 Jun 11:08 2015

Re: 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 11"x17" 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

Randy Evans | 24 Jun 05:40 2015
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HP-419A Fluke 845A Mods - shared link

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
David C. Partridge | 21 Jun 03:31 2015
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Muirhead KVD

I am soon to be the proud owner of a few of the subject Kelvin-Varley Dividers.  Google appears to know nothing!!

Does anyone have a scan of the documentation or even (shock horror) a paper manual?

Regards,
David Partridge 

Greg Welby | 20 Jun 21:36 2015

Re: 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.

Ludger.Lenzen | 19 Jun 22:17 2015
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Re: HP-419 and Fluke 845 Modifications

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

Still interrested and open to help/support.

BR
PeLuLe
Four Designs Company | 11 Jun 00:52 2015
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Wavetek 1281 for sale

Greeting all,

I wish to sell my Wavetek branded 1281 with options 10,20,30,70,80. 
These options comprise AC, Resistance, Current, Analog output.

This instrument has been in my lab about 8 years, used only when needed, 
so the displays are bright. Fully functional, and I have replaced all 
the aluminum electrolytic caps in years past. I could never locate a cal 
key, so the lock has been removed.
I have maintained it with my 4800A, but have not re-cal'd in the last 2 
years or so. It does need a careful, complete re-cal, with good 
standards. But, it is still within 1-2ppm of the 4800A after full warmup 
on the 10VDC range.

Included are photocopies of the manuals

Price is $2800 plus shipping and insurance.

Pictures available on request.

Bob 360-601-2802

Four Designs Company | 11 Jun 00:06 2015
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Datron 1271 AC option

It should be plug-and-play, except for the missing cal constants. Also, 
I think that the 1081 AC option is the same as used in the 1271. I don't 
have the manuals handy, but I believe this is the case.

Bob Koller
Four Designs Company
20615 NE 22nd Ave
Ridgefield, WA 98642
360-887-3356

On 6/10/2015 9:00 AM, volt-nuts-request@... wrote:
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>     1. Datron 1271 AC Option (Greg Welby)
>
(Continue reading)

Greg Welby | 10 Jun 17:38 2015

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>
[Signature]

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>
[Signature]

Tom Knox | 5 Jun 19:01 2015
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External Freq Reference Mod for 3458A?

Does any of the Volt-Nuts brain trust have any experience adding an external Frequency Reference on the 3458A.
There is a 20MHz reference on the A/D board but externally clocking it has affected linearity collecting
data off a 10VDC reference that looks a little like a hanging bridge I have seen before between GPS and
oscillator sync. Is there another clock?  Thanks for any thoughts.

Thomas Knox

 		 	   		  
Jan Fredriksson | 5 Jun 15:22 2015

How are femto-amps measured?

I saw the other day a Keithley 2636B SMU which has 0.1fA resolution  <at> 
10uV in a "normal" Keithley DMM box size. Keithley also have some
systems with external amps that go down even further, to tens of
atto-Amp regions. Even the old HP resolves down to 1fA.

It made me curious.

Dear list: What's the basic principle of such measurements?

Gmane