yorkyong
Joined: 20 Jun 2003
Posts: 26
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 13 Jul 2004 7:34 Trouble in VNA calibration |
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I set the frequency range from 5G to 10G and operate the standard 1 port calibration (SOL), using the standard calibration kits.
I happened to see the strange display:
When I re-connect the "open" calibration kit I used before, the display is not a point or even a short line around the open point in Smith chart (1,0). It is a curve from exp(j*-90degree) to exp(j*-160degree);
When connect the "short" kit, it display a curve from exp(j*90degree) to exp(j*20degree);
The only correct one is "load" , concentrate at (0,0).
Can someone help me and explain it,or something wrong in my calibration?
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