How to determine the bandwidth of a particular frequency in Labview?

Hallo,
After i determined the frequency of a signal, i want to measure the bandwidth of this frequency. how can i do that in labview? is there a block which can calculate it directly?
thanks in advance..

If I remember correctly, the BANDWIDTH is defined as the frequency distance between the -3dB points, relative to the peak.
It's not correct to say "the bandwidth of a frequency", you measure the bandwidth of some process, say an amplifier or a filter.
If you have a spectrum sweep of this filter, then you just measure the peak amplitude and look on both sides for the places where it crosses the 3dB down amplitudes. The difference between those frequencies is your bandwidth.
If it's a narrow bandwidth, you'll have to pay attention to how FFT works or you won't get a good answer from an FFT. If your FFT frequency resolution is low, your precision will be low as well.
I don't think there are any canned solutions for you.
HTH
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks

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