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" <phk@phk.freebsd.dk> > Sent: Sunday, May 03, 2015 4:58 PM > To: "Discussion of precise voltage measurement" <volt-nuts@febo.com>, "Jan Fredriksson" <jan@41hz.com> > Subject: Re: [volt-nuts] "*WAY* too expensive for even Keysight to redesign" > > -------- > In message <CAFoWNwCWaz3F931THBhX+E2OTVT+HBPQ3RxTd+GOmm9uibsKNw@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 > phk@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. > _______________________________________________ > 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.

-------- In message <4092c05$6a20decb$7a77bc81$@com>, "ben" writes: >I note lots of Defence procedures used in their metrology labs still >require a 3458A as a core item, even for more mundane measurements. One of the biggest advantages of the 3458A over any meter before or after, is how simple it is to calibrate. They like that. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@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.

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-bounces@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" <phk@phk.freebsd.dk> > Sent: Sunday, May 03, 2015 4:58 PM > To: "Discussion of precise voltage measurement" <volt-nuts@febo.com>, "Jan Fredriksson" <jan@41hz.com> > Subject: Re: [volt-nuts] "*WAY* too expensive for even Keysight to redesign" > > -------- > In message <CAFoWNwCWaz3F931THBhX+E2OTVT+HBPQ3RxTd+GOmm9uibsKNw@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 > phk@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. > _______________________________________________ > 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. _______________________________________________ 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. --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com