Joe wrote: >Just messing around, I measured a used 9 V battery. On the 100 uV >scale and with some interprolating of the last dial, I read 9.189795 >V at null (with a tiny bit of wobble on the needle). Reading an 895A to 7 significant figures is a case of "false precision," which can lead to overconfidence in the accuracy of measurement results. Fluke specifies the accuracy of the 895A in differential mode as +/- (0.0025% of input + 0.0001% of range + 5 uV) at calibration temperature (around +/- 250 uV uncertainty for the measurement you describe), with calibration recommended every 30 days to maintain that accuracy. Best regards, Charles

You can get two digits from the last dial scale. I didn't say I believed them :-) In fact, given the age and history of this thing, I'm surprised that even the first digit is believeable. Joe Gray W5JG On Wed, Aug 14, 2013 at 12:43 AM, Charles Steinmetz <csteinmetz@yandex.com>wrote: > Joe wrote: > > Just messing around, I measured a used 9 V battery. On the 100 uV scale >> and with some interprolating of the last dial, I read 9.189795 V at null >> (with a tiny bit of wobble on the needle). >> > > Reading an 895A to 7 significant figures is a case of "false precision," > which can lead to overconfidence in the accuracy of measurement results. > Fluke specifies the accuracy of the 895A in differential mode as +/- > (0.0025% of input + 0.0001% of range + 5 uV) at calibration temperature > (around +/- 250 uV uncertainty for the measurement you describe), with > calibration recommended every 30 days to maintain that accuracy. > > 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<https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts> > and follow the instructions there. > >