Thomas wrote:
If I send a 732A to Fluke and have it calibrated, and you stop by with yours shortly after mine returns, has a day or so to settle, and appear correct with my 3458A, you could then calibrate your 732A using of mine and feel fairly confident you standard is also a few PPM from 10 volts. Now lets stay you repeat this with another Volt-Nut when his standard returns. You do not have documents proving the accuracy of your standard because none of the standards used are parts of a accredited lab,
Documentation and accreditation are two entirely different things. In this case, the documentation would be the informal, "on [date] I compared and adjusted this standard to Thomas's 732A that was just back from calibration and sanity-checked with a 3458A, using a [Fluke 845A null meter, or whatever]." Knowing the published uncertainties of the 732A, I can even calculate the uncertainty of my 732A as of the moment of calibration, and at intervals thereafter based on the published uncertainties.
Checking against another recently-calibrated 732A at a later date can confirm or deny that mine remains within the published uncertainty at that time. If it does, that fact becomes part of my (informal) documentation. If it doesn't, the presumption is that one of the 732As is broken. We can suspect that it is mine, but we cannot know that without further testing.
Best regards, Charles _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
