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Accuracy of Spectrum analyser

Posted: Fri Sep 27, 2019 8:55 am
by Sdelaun

We have Redpitayas (10 bits) and we are using them in classroom.
To avoid clipping, we use them with HV inputs and we have problems with the values measured by the Spectrum analyser applications (DFT and the second one):
We have systematicaly 10 dB more than the wanted value, applying a sine wave 1KHz with VRMS value verified on a voltmeter.
Does the software calculate the power displayed with LV input and a dividing factor is applied, mismatching the values using HV inputs?
Thanks for help and if possible, can anyone precise the input setup in the application?

Re: Accuracy of Spectrum analyser

Posted: Thu Oct 03, 2019 2:52 pm
by redpitaya
It can happen that you need to do a calibration. Here is a video tutorial. You will need some precision reference sources.