Forums › SM Series Discussions › Calibration/Correction in MATLAB I/Q Data › Reply To: Calibration/Correction in MATLAB I/Q Data
MZhan
Understood. The perplexing thing is that we are getting frequency-dependent differences between our conversion to dBm in MATLAB and the spike results. The following is for a tone from a sig gen at -30 dBm. I recorded the correction factor for SA but did not apply it. If it were a simple scaling issue, but the calibration is already correctly applied in the float data, I would expect a consistent offset.
Frequency (MHz) MATLAB Spike Correction Factor
400 -30.5 -30.44 0.2907
1000 -31.47 -30.27 0.2586
2000 -34.26 -30.49 0.2422
3000 -31.81 -31.08 0.2457
4000 -30.96 -31.05 0.2539
5000 -32.34 -31.43 0.2505
