Accuracy of Spectrum analyser

Applications, development tools, FPGA, C, WEB
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Sdelaun
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Joined: Fri Sep 27, 2019 7:01 am

Accuracy of Spectrum analyser

Post by Sdelaun » Fri Sep 27, 2019 8:55 am

Hi,

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?

redpitaya
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Posts: 291
Joined: Wed Mar 26, 2014 7:04 pm

Re: Accuracy of Spectrum analyser

Post by redpitaya » Thu Oct 03, 2019 2:52 pm

It can happen that you need to do a calibration. Here is a video tutorial. You will need some precision reference sources.
https://www.youtube.com/watch?v=V3V11jAJdRI

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