On Wed, Oct 12, 2016 at 09:54:01AM +0100, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
> He sold a Agilent 34401A multimeter which the customer said is out of > specification and can not be adjusted. > > Quickly scanning the measurent results, the meter is not showing results > with any huge errors (say 1%), but which (if any) range it is out of > specification I don't know. Unlike the Keysight calibration certificates I > have seen, the measurement results doesn't show the upper and lower limits > for the specification of the meter, so one can not tell from a quick > glance if the meter is out of specification. One would need to study the > detailed specification. In the service guide (document 34401-90013) you will find the full list of performance verification tests with upper and lower limits. You will need a calibrator to verify them (except zero). The DC 10V range accepted error after 1 year from calibration is +- 400uV (+-190uV after 24 hours, +-250uV after 90 days), so -910uV are in effect not inside limits and the instrument needs calibration. Best regards, Andrea Baldoni _______________________________________________ volt-nuts mailing list -- firstname.lastname@example.org To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.