In 2002 I bought a used HP 34401A. Sent it in to Agilent (Loveland, CO) for calibration in March 2005 and they sent it back with both "as found" and "as left" sets of data. This is what the "as found" data said:
100mV = -4 ppm 1.0V = +3 ppm 10.0V = +5 ppm 100V = +4 ppm 1000V = +6 ppm They adjusted it to be perfect. Sent it again to Agilent in April 2009. Had to send it to Roseville, CA this time. (They told me Loveland calibrations were reserved only for their higher precision meters.) The "as found" data from Roseville showed the following: 100mV = +7 ppm 1.0V = +1 ppm 10.0V +1 ppm 100V +23 ppm 1000V = +19 ppm In my opinion the 34401A is an excellent value and this one drifts far less than it's specified values. Your mileage may vary. Regards, mitch -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Joseph Gray Sent: Sunday, August 11, 2013 2:00 PM To: Discussion of precise voltage measurement Subject: Re: [volt-nuts] HP 3457A Would a 34401A be a better choice, over a 3457A for a budding volt-nut? It is newer and smaller, and the ebay pricing is similar. Would having that extra digit via GPIB on the 3457A really be of any practical value? Joe Gray W5JG On Sun, Aug 11, 2013 at 10:29 AM, Charles Steinmetz <[email protected]>wrote: > Chuck wrote: > > I think the statement is awkward English, but what I think he is > trying >> to say is that: >> 1) the instrument will be recalibrated >> 2) after the instrument is verified, by the calibration lab, to be >> working within specs, >> 3) a NIST traceable calibration certificate will be mailed. >> > > The seller does his own calibrations. Also, if he sent it out for > cal, it would come back with a certificate -- why wouldn't he just > leave the certificate in the box when he shipped the unit to the > buyer, instead of mailing it later? Something very strange seems to be going on. > > Best regards, > > Charles > > > > WE WILL RE-CALIBRATED THE UNIT BEFORE SHIPPING AND A NIST TRACEABLE >>> CALIBRATION >>> CERTIFICATE, WILL BE PROVIDED AFTER ITEM IS RECEIVED AND IS ACCEPTED >>> AS WORKING WITH IN SPECS. WE WILL MAIL OUT THE CERTIFICATE. >>> >> > > > ______________________________**_________________ > volt-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/volt-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/vol t-nuts> > and follow the instructions there. > > _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
