[volt-nuts] "*WAY* too expensive for even Keysight to redesign"

ben ben at veritechmeasurements.com.au
Sun May 3 08:46:38 EDT 2015


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.


-------- Original Message --------
> From: "Poul-Henning Kamp" <phk at phk.freebsd.dk>
> Sent: Sunday, May 03, 2015 4:58 PM
> To: "Discussion of precise voltage measurement" <volt-nuts at febo.com>, 
"Jan Fredriksson" <jan at 41hz.com>
> Subject: Re: [volt-nuts] "*WAY* too expensive for even Keysight to 
> --------
> In message 
<CAFoWNwCWaz3F931THBhX+E2OTVT+HBPQ3RxTd+GOmm9uibsKNw at 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 
> 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
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe    
> Never attribute to malice what can adequately be explained by 
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