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Inconsistent amplitude of waveform on gnuradio sink/ ADI IIO OSC

Question asked by mr_nazrin on Sep 12, 2017
Latest reply on Sep 17, 2017 by mr_nazrin

Hello everybody,


I'm using Ubuntu 17.04 + Zedboard + FMCOMMS2 + Remote IIO with sample rate=2.084M , freq= 5k, cylic=true & LO=2.4G. I just run simple signal source (cyclic -sine), sine wave that transmit from TX1A and received on RX1A. My observation found that the output response from waveform sink is inconsistence. for example for the first time run the flowgraph , the magnitude is =+/-600

magnitude +/-600 

Then I close this Top Block and run again this flowgraph. For the second time the response show magnitude is +/-400

magnitude +/-400

Then for the 3rd time, surprisingly now is +/-500

magnitude +/-500


I also verify using OSC , the results are inconsistent.

magnitude +/-1200

magnitude +/- 1200

magnitude +/-600

magnitude +/- 600


I expect that this board can produce consistent output because I want use it as measurement system for my project.

How can I eliminate it and how I know the correct result. What about +/- tolerance ?


Thank you