On 16 January 2018 at 05:01, John Phillips <john.philli...@gmail.com> wrote:
> my experience is that most of the eBay meters that do not give errors are > very close to spec. These old meters do not drift as much as a new meter. > If you have a good 10 volts and 10k resistor calibration is a snap... > verifying cal in not as easy. The high-frequency AC cal is more difficult. > Clearly in the case of the eBay item, it was the high-frequency AC volts that was out of spec. I would imagine a number of labs that may have good enough DC and resistance standards, may well not have good enough high frequency AC standards for this. So maybe that meter would pass at some other labs, who have higher uncertainties than Keysight. Anyway, not that I can afford a 3458A, but I added up the cost of the meter, plus the repair cost, and found it was was not much below the cost of a new meter. I can appreciate your point about a new meter drifting more, but I can also imagine that some of the caps in those old meters might start to show problems. Maybe an Agilent meter might be a sweet spot - not as old as an HP, so but less stable than a newer Keysight. Dave _______________________________________________ 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.