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  1. Nanovna-Users
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Calibration Accuracy

Dave H
 

Hello,

I'm new to VNA's and have just received my nanoVNA

All the YouTubes show calibrating from 50Khz to 900MHz

If you set the range to say 45MHz to 55Mhz, and then calibrate.

will it provide more accuracy over that range, than using the 50khz to 900MHz calibration.

Thanks.. :)
 

Yes, for that narrow range, you will have a set of cal values.The Nanovna natively scans 101 points and if you narrow the freq range, it will still scann 101 points in the narrow range so the interpolation between the points should be better than if the unit needed to interpolate using the 50k to 900M range over 101 points.?
Clear as mud?



On Sun, 22 Dec 2019 at 7:50 PM, Dave H<xwebsubs@...> wrote: Hello,

I'm new to VNA's and have just received my nanoVNA

All the YouTubes show calibrating from 50Khz to 900MHz

If you set the range to say 45MHz to 55Mhz, and then calibrate.

will it provide more accuracy over that range, than using the 50khz to 900MHz calibration.

Thanks.. :)
Bob Albert
 

Still, the calibration is based on the value of the load used for calibrating.? If it's 51 Ohms you will have SWR of 1.02 with a 50 Ohm load.
However, this is usually a trivial error.
Bob

On Sunday, December 22, 2019, 04:56:45 PM PST, Larry Rothman <nlroth@...> wrote:

Yes, for that narrow range, you will have a set of cal values.The Nanovna natively scans 101 points and if you narrow the freq range, it will still scann 101 points in the narrow range so the interpolation between the points should be better than if the unit needed to interpolate using the 50k to 900M range over 101 points.?
Clear as mud?



? On Sun, 22 Dec 2019 at 7:50 PM, Dave H<xwebsubs@...> wrote:? Hello,

I'm new to VNA's and have just received my nanoVNA

All the YouTubes show calibrating from 50Khz to 900MHz

If you set the range to say 45MHz to 55Mhz, and then calibrate.

will it provide more accuracy over that range, than using the 50khz to 900MHz calibration.

Thanks.. :)
Dave H
 

@Larry Rothman

I thought I had read about the "measurement points"
That was what led me to asking the question....

Thanks :)
Dave H
 

@Bob Albert

I understand that... It was more about accuracy over a smaller calibration range.

Thanks...
 

On Sun, Dec 22, 2019 at 07:56 PM, Larry Rothman wrote:


Yes, for that narrow range, you will have a set of cal values.The Nanovna
natively scans 101 points and if you narrow the freq range, it will still
scann 101 points in the narrow range so the interpolation between the points
should be better than if the unit needed to interpolate using the 50k to 900M
range over 101 points.?
Clear as mud?
Great question I was also just wondering. And nice to have the answer, thanks Larry.

--
Regards,
Chris

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