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Measure Frequency Set Time With a Spectrogram Using VSA with Oscilloscope

Question asked by neutrino on Jul 19, 2013
Latest reply on Jul 22, 2013 by algoss
Hello, 

I would like to measure the frequency set time of a transmit system with a fast acquisition scope. The scope has VSA software installed. 

Ideally I would like to use a spectrogram to achieve this. 

However I can not find a useful way to trigger the scope when in spectrogram mode, and the time resolution is not adequate enough to measure the time it takes for the Tx system to change frequency. The event on the spectrogram appears as an instant event, even though it will take a finite amount of time for the synthesiser to change frequency.

Any help on the following is much appreciated, 

Can I trigger the scope in spectrogram mode? If not is there another way to trigger on frequency shift?

If the synthesiser for example requires 500ns to change the frequency, Is it possible to have enough resolution in spectrogram mode to capture and measure this event with fine accuracy?

The scope has 20GS/a, 4GHz BW and the Tx band is in the 2GHz range.

Many thanks.  

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