Interesting you mention the external clock, co-workers actually built a daughter board that replaced the 20MHz oscillator on the A/D board with one that allowed a external 10MHz reference, it noticeably helped with AC measurements. I have no say, but will ask if there is any chance I can share this upgrade with interested members of the Time-Nuts community.. Cheers;
Tom Knox 303-554-0307 [email protected] "Peace is not the absence of violence, but the presence of Justice" Both MLK and Albert Einstein ________________________________ From: volt-nuts <[email protected]> on behalf of Poul-Henning Kamp <[email protected]> Sent: Saturday, October 26, 2019 7:56 AM To: Discussion of precise voltage measurement <[email protected]>; Frank Stellmach <[email protected]> Subject: Re: [volt-nuts] HP3458A - Black Edition -------- In message <[email protected]>, Frank Stellmach w rites: >Therefore, all specifications and manuals are identical.. a pity.. >it was hoped for, that the specifications would be improved. How or what did you expect them to improve ? Improving the long term stability of the voltage and ohm references would be nice, but either one would increase the price by 10% or so, because we would be into "buy ten throw 9 away" territory. Anything else which could deliver relevant improvements gets to be complicated and expensive: Battery power + optical interface could *possibly* reduce the noise a little bit. A custom input connector could *possibly* reduce thermal sensitivity. External clock input *could* allow you to do synchronized sampling. And yeah, you could change the interface to be SCPI, breaking all softwre ever written for that model... So all in all: I would hate to be pointed at and told "make a better one". -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [email protected] | 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 -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com and follow the instructions there. _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com and follow the instructions there.
