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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.
Posted 9th March 2017 at 12:45 AM by
Krell KSA-5 clone
KSA-5 is a power amplifier that can drive speakers. I think using it as a line stage is an overkill unless your power amp is a gain-less buffer such as Firstwatt F4. Even then I guess you could live without the power transistors (Q23-Q26) and perhaps with fewer pairs of the driver transistors (Q15-Q22). Personally, I would rather use the BA-3 front end as a line stage, not the KSA-5.
Posted 26th February 2017 at 07:48 AM by
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