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© National Instruments Corporation 9 NI Spectral Measurements Toolkit User Guide
The channel specification parameter specifies the center frequency,
bandwidth, and spacing for the ACP measurement. The bandwidth
parameter specifies the width of each channel. The spacing parameter
specifies the separation between the center frequencies of each channel.
The Units [rms] parameter specifies the units for the ACP measurement.
The Power Spectrum parameter is a waveform graph that shows the power
spectrum with the three channels, or bands, and the power in each channel.
The Advanced Settings tab of the example includes some of the same
controls as the SMT Spectrum Analyzer (simulated) example, such as
Averaging Parameters.
Using LabWindows/CVI Spectral Measurements
Examples
This section describes some of the LabWindows/CVI programming
examples located in the
<
LabWindows/CVI
>\samples\smt folder. You
can use these example programs as a starting point for your applications.
The
simulated folder contains examples that use a simulated source. Use
these examples to explore different features of the Spectral Measurements
Toolkit without using a data acquisition device.
Continuous Zoom FFT
The Continuous Zoom FFT example is located at samples\smt\
simulated\smtcz\smtcz.prj
.
This example demonstrates how to configure the zoom FFT, then calculates
an averaged power spectrum using the continuous zoom FFT technique.
It demonstrates how to display the spectrum in different RF units.
Frequency Response Measurement
The Frequency Response Measurement example is located at samples\
smt\simulated\smtfqres\smtfqres.prj
.
This example demonstrates how to configure the zoom FFT, then calculates
the averaged frequency response of a stimulus and response signal from
a device under test. The example uses the block zoom FFT technique.
The example uses handles to maintain state information between functions,
such as
SmtConfigZoomFFT and SmtZoomFFT.