© National Instruments Corporation 3 NI Spectral Measurements Toolkit User Guide
Using the Spectral Measurements Toolkit
The Spectral Measurements Toolkit contains LabVIEW VIs and
LabWindows/CVI functions that perform the following operations:
• Zoom frequency analysis—Zoom fast Fourier transform (FFT)
functions and VIs allow you tozo om in on a narrow frequency range
in a spectrum.
• Spectrum averaging—The Spectral Measurements Toolkit supports
averaging types such as root-mean-square (RMS) averaging, vector
averaging, and peak-hold averaging.
• Spectral measurements—The Spectral Measurements Toolkit contains
functions and VIs that can measure power-in-band and adjacent
channel power.
• Unit conversion—The Spectral Measurements Toolkit unit conversion
supports typical radio frequency (RF) units, such as volts RMS
squared (V2rms), decibel (dB), decibel milliwatts (dBm), and dBm per
hertz (dBm/Hz). You can use the Spectral Measurements Toolkit to
convert a raw FFT spectrum to a power spectrum or power spectral
density for noise measurements.
• Peak power and frequency determinations—The Spectral
Measurements Toolkit includes a spectrum peak search algorithm
that determines peak levels and frequency.
• Zoom processing configuration—The Spectral Measurements Toolkit
configuration functions and VIs allow you to use conventional
measurement settings, such as center frequency, span, and resolution
bandwidth (RBW) to configure zoom processing. The configuration
functions and VIs return an acquisition size based on your spectrum
settings.
• Spectrogram—The Spectral Measurements Toolkit contains VIs that
allow you to compute joint-time and frequency-domain calculations
and display the results as a spectrogram. This feature is supported only
in LabVIEW.
• Analog modulation—The Spectral Measurements Toolkit supports
analog modulation to perform amplitude, frequency, and phase
modulation and demodulation. Functions and VIs are included to
perform upconversion and downconversion on baseband and passband
signals.