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What's the difference between save trace and save recording in VSA?

Question asked by so2liu on Mar 2, 2018
Latest reply on Mar 5, 2018 by jcresp


I am using VSA and matlab to do QPSK and IQ Imbalance things. I opened the measured data (sdf-format) in VSA and resave it as trace and recording in mat-format. Then I loaded those data and ploted them.

However, in trace document the points locate only around the constellation, while in recording document there is a lot of points in the middle. The amplitudes are also different.

In the pic, above is the first 4096 points in the recording, below is the points in trace.

Could anyone help me?


Yang Liu