But in calibration you have to make some type of corrections and on verification you dont you just compare to be within the manufacturer ranges. Now for instance Tektronix has verification manuals to check their equipment, before they called them calibration manuals and included adjustment to meet the specifications of the manufacturer. Now the user cant adjust easily because most are via software and is not commercially available.
________________________________ From: volt-nuts <[email protected]> on behalf of Dr. David Kirkby <[email protected]> Sent: Saturday, June 6, 2020 9:19 AM To: Discussion of precise voltage measurement <[email protected]> Subject: Re: [volt-nuts] What if “verification” in metrology? On Sat, 6 Jun 2020 at 12:18, Florian Teply <[email protected]> wrote: > Funny thing how things work out time-wise: I had a discussion yesterday > on the very topic during re-audit for ISO 9001. > Yes, it is. In basic terms, verification in metrology is a very slimmed down > calibration: For a calibration, you essentially check every range of > your instrument at usually five or more spots within that range in > order to determine accurracy of your instrument in each range. > For a verification, you do this only at the spot where you intend to > measure. So if you were to measure a nominal 7.2V source, you'd compare > the reading of your meter with your, say, known good 7.5V reference > instead of doing a full calibration of the meter. > > So, in order to determine whether or not your chinese voltage reference > meets its specs, you'd check your meter against, say, the > well-characterized LTZ1000A you happen to have in your lab. > > Strictly speaking, you still have to do it as carefully as you would do > a real calibration, taking all known effects into account, but it's > still much less time-consuming than a full calibration as you check only > one single point instead of all possible ranges with five points each. > > Does this help answer your questions or did I just bring up more > questions than answers? > Yes. I wish VIM was a bit more explicit about it. A single sentence just does not do it justice. best regards, > Florian > 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. _______________________________________________ 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.
