On 11 August 2013 22:34, Charles Steinmetz <[email protected]> wrote: > Orin wrote:
>> BTW, they don't list any accreditation on the certificate. > > > As I suspected. So it is vanishingly unlikely that they do traceable > calibrations, contrary to their claim. I see a lot of sellers selling things on ebay which are NIST tracable, but I wonder what this means. Let's asume I borrow a 3458A 8.5 digit DVM which has a valid (i.e. non- goldenrubi ) NIST tracable calibration, and use the 3458A to calibrate my 4.5 digit handheld DVM. If I work out all the uncertainties, could I perform a NIST traceable calibration on a 6.5, 7.5 or even 8.5 digit meter using my handheld DVM? Of course, I'm not suggesting for one minite it is reasonable to calibrate a high end DVM with a handheld one, but could such a calibration still be NIST traceable? It would have not a hope in hells chance of being able to determine if a 6.5 digit DVM is in spec, but does that matter if all the customer wanted was a NIST traceable calibration? My VNA is going off to Agilent this week for cal. I'm just having an Agilent calibration https://service.home.agilent.com/infoline/public/product-service.aspx?pn=8720D&lc=eng&cc=GB not an acredited calibration. I know, from discussions I have had with Agilent staff, it will be the same test equipment calibrating it, using the same automated procedures, so I don't want to pay 50% extra for acreditation. I trust Agilent can properly calibrate their own product. At the end of the day a lot of this is about trust. Dave _______________________________________________ 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.
