Frequency deviation definition and measurement method

VHDLI2C11

Frequency deviation definition and measurement method [Copy link]

Hello everyone, today we used DDS to make FM frequency modulation signal. Now I have a question to ask you, which is how to accurately measure the frequency deviation of the modulated signal. Now we have a 9k-1.5G spectrum analyzer, but the frequency component seen after connecting to the signal is always jittering, and it is difficult to measure the accurate frequency deviation. The model of the spectrum analyzer is DSA815, and we don’t have the manual, only the more commonly used functions. I wonder if the spectrum analyzer can have this function of checking frequency deviation or there are other ways to measure it accurately?

VHDLI2C11

I just tried to reduce the resolution bandwidth and found that the measurement effect is still relatively accurate, because the method of reducing the resolution can be used

RF-刘海石

Adjust RBW and VBW, and then you can see the max hold.

VHDLI2C11

RF-Liu Haishi posted on 2019-8-5 12:40 Adjust RBW and VBW. Then max hold can be seen.

Yes, I can see it clearly after reducing the resolution bandwidth, thank you