Re: edy555 design notes on CALIBRATION sets
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That's a great point.? Testing components, especially inductors, at the intended frequency of use is great.? And the NanoVNA makes it easy - which means I might do actually do it...
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Mike WY6K "... somewhere in the distance, there's a tower and a light, broadcastin' the resistance, through the rain and through the night..." On Wednesday, October 2, 2019, 2:12:49 PM CDT, Oristo <ormpoa@...> wrote:
Hi Mike- This was a little unclear to me, but interesting.? Are you saying thatExactly, IMO "calibration" should reflect actual measurement configuration ? Then the data you posted was for that inductor?Yes, one that is very liable to stray pickup. The attached image shows nanoVNA display for a frequency scan, and hopefully visible is an approximating circular segment Smith plot, as reactances should be. While component RLC values at intended application wavelength[s] are obviously of interest, observing Smith plots over a wider range can reinforce credibility or reveal anomalies. Having not been otherwise informed, nanoVNA reports 50 Ohms for that 51 Ohm resistor; I can live with 2% errors... IMO, 5 stored calibrations are none too many. |
WY6K Mike Watts