Re: [volt-nuts] Banana jack shorting straps

[John Allen]

Tonight please.  J

PS: I am flat broke and scared shitless.

-Original Message-
From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Jeremy Nichols
Sent: Wednesday, November 08, 2017 8:57 PM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Banana jack shorting straps

Previous Next


Did you hear about the dyslexic, agnostic insomniac?

He stayed up all night wondering if there was a dog.



On Wed, Nov 8, 2017 at 2:20 PM Mark Sims  wrote:

> Recently on EEVBLOG there was a thread where a guy mentioned that he was
> going to machine some shorting bars for banana jack out of copper.   I made
> the suggestion to gold plate them to avoid copper oxide issue.  Another guy
> mentioned making them like a PCB (like Fluke does).
>
> I did a little thinking and checking and am going to have some built.
> Probably 0.8 .. 1mm FR4 core, 15x35 mm, double sided 2 oz copper,  ENIG
> gold finish.   Anybody interested in some?   Fab cost goes down rather
> quickly with quantity.  Cost target is maybe $10 for 10 pieces shipped.
> OSHPARK cost would be around $5 for three boards on 1.6mm, 1 oz copper.
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-- 
Sent from my iPad 4.
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Re: [volt-nuts] low emf solder

[John Allen]

Googling for "Things I Won't Work With" finds the article and others by Derek 
Lowe in his blog.

John K1AE

-Original Message-
From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Mark Sims
Sent: Saturday, October 29, 2016 1:38 AM
To: volt-nuts@febo.com
Subject: [volt-nuts] low emf solder

I don't know if it the proper way but I used a very nice fume hood.   Measured 
the metals (high purity),  melted them in a quartz crucible,  stirred with a 
quartz rod,  and cast it in a ceramic block with a spiral pattern machined into 
it with a ball mill. You don't want to contaminate the mixture with other 
metals, etc.

That "Things I Won't Work With" article was about dimethyl cadmium, not 
metallic cadmium.  Reall Nasty Stuff.  Metallic cadmium and cadmium plating has 
been used for ages without killing too many people.  It's not something to take 
lightly, but I've had the pleasure of working around far worse things.

For even more extreme nastiness check out dimethyl mercury... one drop, goes 
through rubber gloves like they aren't there,  sure-fire rather horrible death. 
  Derek Lowe's "Things I Won't Work With" series is some of the best reading 
out there...  Unfortunately,  I don't think that he is still doing them.  His 
old web site has disappeared.

Just checked...  Derek is at it again after a two year hiatus...  woohoo!  He's 
my favorite chem-blogger.   Something makes me want to play with all the things 
he won't work with.
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Re: [volt-nuts] HP-3458A Zero Reading

[John Allen]

Bill wrote -

There is an application note from Fluke, I think, on using DVMs for null
meters.

Fluke_-_Using_a_DMM_to_balance_752A_Divider.pdf   is the name if it.
I think it came from the Fluke Calibration Website.

It is available at
http://www.ko4bb.com/manuals/download.php?file=Fluke/Fluke_-_Using_a_DMM_to_balance_752A_Divider.pdf

John K1AE

-Original Message-
From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Bill Gold
Sent: Monday, July 27, 2015 7:54 PM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] HP-3458A Zero Reading

Randy:

I sure hope you are not trying to use 26 ga. telephone wire for the zero
shorting wire.  The manual recommends either 14 ga. or 12 ga. solid copper
wire, this is the kind you can get for basic electrical wiring in conduit in
homes, at least in the US.  Generically called TW in electrician's
language.

My 3458A reads about -0.20 uv before AutoCal and less than +0.20 uv
after,  with the short as described in the manual.  You will observe that
the HP/Agilent/Keysight manual for the 3458A does not give any zero
stability specs, at least that I can find.

I have been using the 3458A for nulling my 752A and have had no problems
with my homemade low thermal leads as I described them to you.
Belden/Pomona components.  I use 100PLC.

There is an application note from Fluke, I think, on using DVMs for null
meters.

Fluke_-_Using_a_DMM_to_balance_752A_Divider.pdf   is the name if it.
I think it came from the Fluke
Calibration Website.

Bill



- Original Message - 
From: Randy Evans randyevans2...@gmail.com
To: volt-nuts@febo.com
Sent: Sunday, July 26, 2015 6:19 PM
Subject: [volt-nuts] HP-3458A Zero Reading


 I shorted the input terminals of my HP-3458A with a short lead of copper
 wire, Bell telephone wire as recommended in the manual.  The reading I get
 is around 000.00070 mV, or 0.7 uV with NLPC set to 100.  I was trying to
 evaluate it's use as a null meter for my Fluke 752A divider.  This seems a
 little higher than I would expect but no amount of running AUTOCAL or ZERO
 changes this amount.  Is this considered acceptable?

 Randy AE6YG
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Re: [volt-nuts] volt-nuts Digest, Vol 70, Issue 16 HP-419

[John Allen]

Hi Randy - I am having the same problem with both schematics - The 500K PDF 
shows up as 162KB and the 0.96 MB file is 161KB.  I have 199 Mbit/s download 
speed.  No problem downloading other PDFs even 600 MB ones.

John K1AE

-Original Message-
From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Chuck Harris
Sent: Saturday, June 27, 2015 12:53 AM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] volt-nuts Digest, Vol 70, Issue 16

The usual reason for that is your download speed is slow,
and the download process times out before the entire file
has been downloaded.

You need to try again until you get the full file downloaded.

-Chuck Harris

Sam Reaves wrote:
 Randy,

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

 Sam



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

[John Allen]

Hi - I did some investigating and found that the download fails when downloaded 
with the latest Firefox (38.0.5).

But, it works when downloaded with the latest Chrome (Version 43.0.2357.130 m).

FWIW, I download many PDFs a day (But not from Dropbox) all are successful with 
Firefox.

John K1AE

-Original Message-
From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Chuck Harris
Sent: Saturday, June 27, 2015 12:53 AM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] volt-nuts Digest, Vol 70, Issue 16

The usual reason for that is your download speed is slow,
and the download process times out before the entire file
has been downloaded.

You need to try again until you get the full file downloaded.

-Chuck Harris

Sam Reaves wrote:
 Randy,

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

 Sam



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

[John Allen]

Hi Randy - Simple Free web hosting is available through http://dropbox.com 
Install it and it creates a folder on you PC that you can drag and drop files 
and folders into.
Then you go to your Dropbox web page and can share a link.
You get 2 GB for free.

Just a satisfied user..  John K1AE

-Original Message-
From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Randy Evans
Sent: Saturday, June 20, 2015 11:22 PM
To: Discussion of precise voltage measurement
Cc: randyeva...@gmail.com
Subject: 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] *WAY* too expensive for even Keysight to redesign

[John Allen]

Hi Ben and all - As you probably know, Keysight is still selling new 3458As,  
Starting From US$ 9,586

Regards,  John, K1AE

-Original Message-
From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of ben
Sent: Sunday, May 03, 2015 8:47 AM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] *WAY* too expensive for even Keysight to redesign

Hello,

I note lots of Defence procedures used in their metrology labs still 
require a 3458A as a core item, even for more mundane measurements. Defence 
seemingly are not switching over to newer voltmeters, or writing out the 
need for a 3458A. While defence are still maintaining old platforms it 
makes sense to them in keeping the originally specified test equipment in 
the relevant procedure - so long as HP keeps supporting the 3458A.

ben


 Original Message 
 From: Poul-Henning Kamp p...@phk.freebsd.dk
 Sent: Sunday, May 03, 2015 4:58 PM
 To: Discussion of precise voltage measurement volt-nuts@febo.com, 
Jan Fredriksson j...@41hz.com
 Subject: Re: [volt-nuts] *WAY* too expensive for even Keysight to 
redesign
 
 
 In message 
cafownwcwaz3f931thbhx+e2otvt+hbpq3rxtd+gomm9uibs...@mail.gmail.com
 , Jan Fredriksson writes:
 
  Could you say a bit more about this? Did the 3458A not make
 economic sense for HP at the time? Is nobody buying 8.5s these days?
 
 It's an interesting historical confluence:  8.5's are the clippers of 
DVMs.
 
 8.5 only makes sense two places: fundamental/high-end metrology
 and basic research.
 
 Everybody else are totally fine with 7.5 and very few actually need
 more than 6.5 (specifying the temperature of your aligator-clips
 gets old really fast.)
 
 The 3458A made it possible to validate the josephson junction as
 SI voltage reference -- which ironically made the 3458A surplus to
 metrology requirements:  Now you can generate any voltage you want
 on demand.
 
 That leaves a theoretical market in basic research, but that's a
 very small market which will happily pay a phd-theses for a prototype,
 but unless its on CERN scale, production runs are never an option.
 
 -- 
 Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
 p...@freebsd.org | TCP/IP since RFC 956
 FreeBSD committer   | BSD since 4.3-tahoe
 Never attribute to malice what can adequately be explained by 
incompetence.
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Re: [volt-nuts] [time-nuts] TM500/TM5000/HP-5370 Extender cables and cards

[John Allen]

Hi Mark - do you recommend one 5370 Extender set or two?

I definitely want one.

Regards, John 
 
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Mark Sims
Sent: Saturday, October 11, 2014 11:46 PM
To: time-n...@febo.com; volt-nuts@febo.com
Subject: [time-nuts] TM500/TM5000/HP-5370 Extender cables and cards

The TM500/5000 and HP5370 extender kits are now available (actually they were 
ready a few weeks ago, but I was going to be out of town and did not want to 
leave people hanging).Prices are:HP5370 extender card kit - has 2 x 36 pin 
extenders and 1 x 44 pin extender.  $30 setTektronix TM500/TM5000 module 
extender cable kit - $20Tektronix TM5000 GPIB extender cable (assembled) $20US 
shipping is $6 for any number of kits.
International shipping is $15 for any number of kits.  If you need 
international tracking they must go registered mail which adds another $15 (and 
slows down the mail) or express mail which is stupid expensive.  
All kits include everything you need to get going except solder and basic 
tools.Email me for my Paypal address.The HP5370 extenders are 5 inches long.The 
TM500 kits include a pair of 17 40 pin IDE ribbon cables.  You may want to use 
your own, longer cables.  The TM5000 GPIB cable is around 28 long.Remember 
that some TM500/5000 modules require 2 or 3 extender cables...  I even have one 
that needs 4,  but it is a one-off custom design.   

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Re: [volt-nuts] 732b transformer replacement

[John Allen]

Have you considered rewinding the transformer?

Regards, John 
 
-Original Message-
From: volt-nuts-boun...@febo.com [mailto:volt-nuts-boun...@febo.com] On
Behalf Of new
Sent: Wednesday, June 04, 2014 5:17 PM
To: volt-nuts@febo.com
Subject: [volt-nuts] 732b transformer replacement

My 732b is fine but its transformer bit the dust before I got it.

Actually, that's probably WHY I got it on fleabay.. its previous owner
changed the battery and still couldn't get it to charge!
So it went on fleabay as 'parts/not working'..
for a price I could afford!

The primary is cooked. Using a fresh battery powers the standard, though,
with a solid 9.9 volts on my junk 3458 for two months.

I just want a transformer for 120V... don't need all the world's voltages.
Since it probably won't be guarded, I would unplug the
732 and go on battery to do readouts to avoid powerline crosstalk problems.

  The best of all worlds would be to get the exact, correct transformer.

Willy
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Re: [volt-nuts] VS330

[John Allen]

Yes. 7 or higher is required.

John K1AE

John Allen - PC Support Solutions www.pcsupportsolutions.com 
PC On Site Service and Training - Computer HW/SW/Network debugging, installation
and upgrades.
mailto:j...@pcsupportsolutions.com M: 508 361-6229
 


-Original Message-
From: volt-nuts-boun...@febo.com [mailto:volt-nuts-boun...@febo.com] On Behalf
Of RF PRECHTL K7DFW
Sent: Saturday, September 21, 2013 11:42 AM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] VS330






Downloaded this pdf from KO4BB and my Adobe reader 6.0.6 - 01/08/2007 claims it
is damaged and not
capable of opening.


Is this a case where Adobe is not backwards compatible and the KO4BB Adobe being
too new for my
2007
edition?


Rolynn

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