I'm now the proud owner of a HP 3458A OPT-002. I have adapted Mark's 3458A CalRam program to use linux-gpib , and have made backups of the calram , and the dataram. I will get a new calram : http://tinyurl.com/mggqmos And 2 x dataram : http://tinyurl.com/otspeek I'll get 4 x 32k SRAM for opt 001 - hopefully these are correct. http://tinyurl.com/kjbtcla Does anyone know if the Eproms are already in sockets ? I was planning on installing sockets for the calram , datarams , but have hoped the eeproms was already in sockets. TIA CFO - Denmark

hi the EPROMs are in sockets, no soldering needed. but again, buying a precision instrument but reprogramming cal data that is years old does not make any sense. unless of course if you are just a collector and do not use its accuracy. adrian > Gesendet: Dienstag, 07. Oktober 2014 um 16:35 Uhr > Von: cfo <xnews5@luna.dyndns.dk> > An: volt-nuts@febo.com > Betreff: Re: [volt-nuts] Old HP3458A - SN: 2823A 03939 > > I'm now the proud owner of a HP 3458A OPT-002. > > I have adapted Mark's 3458A CalRam program to use linux-gpib , and have > made backups of the calram , and the dataram. > > I will get a new calram : > http://tinyurl.com/mggqmos > > And 2 x dataram : > http://tinyurl.com/otspeek > > > I'll get 4 x 32k SRAM for opt 001 - hopefully these are correct. > http://tinyurl.com/kjbtcla > > > Does anyone know if the Eproms are already in sockets ? > > I was planning on installing sockets for the calram , datarams , but have > hoped the eeproms was already in sockets. > > > TIA > CFO - Denmark > > _______________________________________________ > 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 <trinity-4eaeea83-41ce-4ea9-8a7d-5749d2e1cfda-1412756583213@3capp-gm x-bs02>, acbern@gmx.de writes: >the EPROMs are in sockets, no soldering needed. >but again, buying a precision instrument but reprogramming cal >data that is years old does not make any sense. >unless of course if you are just a collector and do not use its accuracy. >adrian in general I'd agree, for the HP3458A not so much: The two internal references are incredibly stable over long periods of time. -- 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.

On 10/8/2014 4:23 AM, acbern@gmx.de wrote: > the EPROMs are in sockets, no soldering needed. > but again, buying a precision instrument but reprogramming cal data that is years old does not make any sense. > unless of course if you are just a collector and do not use its accuracy. It makes perfect sense, for the same reason that HP doesn't touch the cal if it's in spec - for tracking/characterization. By keeping the same cal constants, if and when he does send it in for calibration he'll be able to know how much it drifted since it was last cal'd (25 years ago?). -- Mike

well, I do that with my references if they cannot be adjusted reasonably such as the 732a. but for meters and calibrators I do not. achievieng high precison with such an instrument then means you still need to characterize it (i.e. calibrate, and not adjust it, doesnt save money essentially) and secondly you always need to apply a transfer factor, i am too lazy for that, i rather get it adjusted when i cal it. also, the reference is stable, true, but other things do drift, and we talk 10+ yeras here (last cal sticker i saw). it would certainly be interesting to know where its different ranges went inbetween (if it was known that it was adjusted to within spec back then, which probably is not known) > Gesendet: Mittwoch, 08. Oktober 2014 um 10:32 Uhr > Von: "Mike S" <mikes@flatsurface.com> > An: volt-nuts@febo.com > Betreff: Re: [volt-nuts] Old HP3458A - SN: 2823A 03939 > > On 10/8/2014 4:23 AM, acbern@gmx.de wrote: > > the EPROMs are in sockets, no soldering needed. > > but again, buying a precision instrument but reprogramming cal data that is years old does not make any sense. > > unless of course if you are just a collector and do not use its accuracy. > > It makes perfect sense, for the same reason that HP doesn't touch the > cal if it's in spec - for tracking/characterization. By keeping the same > cal constants, if and when he does send it in for calibration he'll be > able to know how much it drifted since it was last cal'd (25 years ago?). > > -- > Mike > _______________________________________________ > 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. >