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.
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.
Scopes, in general, can't do a real-time trigger on a frequency shift. You don't say whether the shift is up or down, but you might be able to trigger on 'pulse-width'.
Once you have triggered, if you have the EZjit package, you could graph the frequency over time then use markers to measure the settling time.
I doubt that you could do this using VSA, since it is not a 'real-time' tool, and unless you have a separate trigger to let you know when the frequency shift will happen, it won't see it.
Al
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