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  1. Old Comment

    Upgrade Fluke 510A AC voltage reference

    Update- I needed to check the voltage accuracy of some of my meters. They were all reading different things so it was time to do some calibration. Staring from a Fluke 732A 10V (+/- 50 mV max under my circumstances, probably closer to 5 mV but I have no way to tell) I used the AC-DC transfer capability of a Fluke 8506A to transfer the DC of the 732A to the 510A. a small tweak (100 mV high or 10 PPM so not really significant) and then back to the bench to check meters. Yes, they all say different things. But on the Shibasoku I determined that the harmonics are at -120 dB or better and the THD+N is -110 dB or better. There are upper harmonics in the output, probably artifacts of the S/H leveling circuit. Still very useful as a transfer standard. Frequency is still within a few PPM after sitting for 5 years.
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    Posted 9th March 2017 at 12:45 AM by 1audio 1audio is offline
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