SCPI reading the avg power value in zero span

There is not currently a way to extract that value. It is something I could add relatively easy (I believe) for the next release of Spike.

In the meantime, if you are retrieving the I/Q data, you can make this measurement with the equation

10*log10(mean(I^2 + Q^2));

In spoken word, calculate the linear power of each I/Q sample, I^2 + Q^2, calculate the mean of the linear powers, then take the 10*log10 of that mean.

This would give you the average power in dBm over the sample interval of your choice.

Given this, would you still be interested in a SCPI command to retrieve this value?

I look forward to your response.

Thanks for the additional feedback!

Andrew

Sorry, it looks like I didn’t update the SCPI manual to reflect the change.

Try “FETCH:ZS? 10” for the average power.

Let me know if you run into issues or have follow up questions.