Specifies the FFT window to use.

You do not need to use a selector string to configure or read this property for the default signal instance. Refer to the Selector Strings topic for information about the string syntax for named signals.

The default value is Hamming.

Remarks

The following table lists the characteristics of this property.

Short Name PhaseNoise FFT Window
Data type ci32.png
Permissions Read/Write
High-level VIs N/A
Resettable Yes
None 0

Analyzes transients for which duration is shorter than the window length. You can also use this window type to separate two tones with frequencies close to each other but with almost equal amplitudes.

Flat Top 1

Measures single-tone amplitudes accurately.
Hanning 2

Analyzes transients for which duration is longer than the window length. You can also use this window type to provide better frequency resolution for noise measurements.
Hamming 3

Analyzes closely-spaced sine waves.
Gaussian 4

Provides a good balance of spectral leakage, frequency resolution, and amplitude attenuation. Hence, this windowing is useful for time-frequency analysis.
Blackman 5

Analyzes single tone because it has a low maximum side lobe level and a high side lobe roll-off rate.

Blackman-Harris 6

Useful as a good general purpose window, having side lobe rejection greater than 90 dB and having a moderately wide main lobe.

Kaiser-Bessel 7

Separates two tones with frequencies close to each other but with widely-differing amplitudes.