This answer is consistent to my experience also. I've attached a log file of two 3458A that represents typical operation. I ALWAYS log internal temperature and usually display corrected difference from CAL-10 Temp. The SN:19542 exhibits worse T.C. characteristics and also has an unusual -T.C. for the 10 VDC range. The graph clearly shows why logging temp along with critical measurements is important.
Regards... Don -----Original Message----- From: volt-nuts <[email protected]> On Behalf Of Andreas Jahn Sent: Friday, November 01, 2019 2:38 AM To: [email protected] Subject: Re: [volt-nuts] Lab temperature stability required for X digit multimeters. Hello, a typical 3458A has a T.C. around +/- 0.2 ppm/K. For highest stability I would keep the temperature 23 deg C +/- less than 1 K. And keep the fan filter clean so that the internal temperature does not rise. But in this case you should also control humidity. With epoxy packaged voltage references I have seen 0.5 ppm / %rH output voltage change. Any epoxy PCB used within a instrument should have a similar effect on components soldered to the PCB. with best regards Andreas Am 01.11.2019 um 01:48 schrieb Dr. David Kirkby: > I know before I ask this question that “it depends” will be part of > any answer. However, I will ask it anyway. > > How stable does a lab temperature need to be maintained, in order to > warrant using an 8.5 digit multimeter such as a 3458A? The same > question for 6.5 and 7.5 digit meters. > > Dave. _______________________________________________ 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.
HP3458A 09095 & 19542 5-Day Stability Run.pdf
Description: Adobe PDF document
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