开云体育

Agreed

That requires making and calibrating an RF volt meter. I don’t know the what sort of accuracy one could achieve with that, but I don’t have any obvious ways of checking that. If that resistor was 10 m ohm, which was the sort of value I was hoping to use, a 50 ohm power meter would cause negligible loading. But RF lower measurements are tricky, and achieving a 2% uncertainty is tricky. Neither my RF power meter no the 10 MHz to 18 GHz sensors are calibrated. At least a thermal method can be calibrated with DC substitution. I suspect that my uncertainty of a thermal method would be lower than I achieve with an RF volt meter.?

I am interested in making the overall uncertainty of Q measurements as low as possible - not because I have a need for a low uncertainty, but because it would be interesting to do the best job possible.

Dave?