I have an SAA2N that has been working fine. Yesterday I was using it to measure a long run of coax, and it was working fine. Then it just started acting like it was not sending a signal out of port 0. I reset the calibration, and noticed on the smith chart with nothing attached to port 0, the dot was near the left side of the smith chart that would normally indicate a short. I put the 50 ohm load on it, and the dot did not move, nor when I put on the short.
I decided to calibrate it, so ran through the calibration procedure, and now I get the spaghetti screen (lines all over the place). If I reset the calibration, it goes back to the trace on the left side of the smith chart.
It is acting like there is a short on port 0. Has anybody had this happen? I tried resetting everything, and results are exactly the same...
Thoughts?
Thanks!
Tom
