On Mon, Jul 29, 2013 at 12:25 AM, David Kirkby <[email protected]>wrote:
> On 28 July 2013 23:15, Joseph Gray <[email protected]> wrote: > > I recently had it explained to me that "calibration" is really just > > checking a piece of gear against a known standard, to see if it meets the > > manufacturers specification. If it is outside specified values, then it > > gets "adjusted", not "calibrated". > > > I think it depends somewhat on who cals it, and under what conditions > are stated. > > I think if something is specified with an uncertainty of 10%, and is > found to be 9.9% off, then I feel it should be adjusted as it is close > to the limits of being acceptable, even though it is within spec. > > Certainly with Agilent, you will pay more for the cal if you want both > "before" and "after" data. > Here is what Agilent say about the new 3446xA DMMS: "Adjustment is Recommended Whatever calibration interval you select, Agilent Technologies recommends that complete re-adjustment should always be performed at the calibration interval. This ensures that the instrument will remain within specifications for the next calibration interval and provides the best long-term stability. Performance data measured during performance verification tests does not mean that the instrument will remain within these limits unless the adjustments are performed. Use the calibration count to verify that all adjustments have been performed. " This is however, a closed box calibration where the calibration process stores correction constants in non-volatile memory. There are no concerns about flaky trimpots etc.. Orin. _______________________________________________ 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.
