I read 8722ES manual, 08720-90392.pdf. In page 3-30, it says Electrical Length=range *the speed of light (3*10^ 8 m/s). range=(number of points-1)/frequency span.

I use frequency list to calibrate 8722ES, starting at 8GHz, stoping at 40GHz and 1GHz per step, so there is 33 points in total. I think the electrical length of the frequency is approximately (33-1)/(40-8)GHz* (3*10^8m/s)=0.3m

But what is the electrical length if I set the frequency 8G, 8.01G,9G,9.01G,10G,10.01G,11G,11.01G...40G?

Is there a difference in the electrical length if I set the frequency 8G, 8.5G,9G,9.5G,10G,10.5G,11G,11.5G...40G?

Thanks.

I use frequency list to calibrate 8722ES, starting at 8GHz, stoping at 40GHz and 1GHz per step, so there is 33 points in total. I think the electrical length of the frequency is approximately (33-1)/(40-8)GHz* (3*10^8m/s)=0.3m

But what is the electrical length if I set the frequency 8G, 8.01G,9G,9.01G,10G,10.01G,11G,11.01G...40G?

Is there a difference in the electrical length if I set the frequency 8G, 8.5G,9G,9.5G,10G,10.5G,11G,11.5G...40G?

Thanks.

For you work, please consider the situation to be that you must keep the phase shift between measurement points less than 180 degress. In your case, you will have a valid measurements between two points, say 8 and 8.01 GHz, but you will not know the actualy phase shift between 8.01 and 9 GHz if you have a long device.