RFmxSpecAn ACP Configure FFT VI

Selector String specifies a selector string comprising of the signal name. If you do not specify the signal name, the default signal instance is used. The default value is "" (empty string).

Example:

""

"signal::sig1"

You can use the RFmxSpecAn Build Signal String VI to build the selector string.

Instrument Handle In specifies the RFmx session refnum. Instrument Handle In is obtained from the RFmxInstr Initialize NIRFSA VI.

FFT Window specifies the FFT window type to use to reduce spectral leakage. Refer to the Window and FFT section of the Spectral Measurements topic for more information about FFT window types. The default value is Flat Top.

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 balance of spectral leakage, frequency resolution, and amplitude attenuation. 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 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.

FFT Padding specifies the factor by which the time-domain waveform is zero-padded before an FFT. The FFT size is given by the following formula: FFT size = waveform size * padding. This parameter is used only when the acquisition span is less than the device instantaneous bandwidth. The default value is -1.

error in describes error conditions that occur before this node runs. This input provides standard error in functionality.

Instrument Handle Out passes a reference of your RFmx session to the next VI.

error out contains error information. This output provides standard error out functionality.