Math setups Spectral analysis overview
windows p rovide better amplitude accuracy over frequency resolution. The choice of window also affects
the resolution bandwidth.
Gate Position moves the gate
that selects the data for the spectral waveform. The gate position is the
center point in the gate measured in seconds with respect to the trigger point. In most cases the phase
reference point is located at the center of the gated data. However, if you use a Tek Exponential
window, the phase reference point is at the 20% point of the gated data.
Gate Duration sets the gate time duration in seconds. The default gate duration is the duration of the
entire waveform record. The resolution bandwidth is inversely proportional to the gate duration.
Gate Length displays the g ate length in points. The d e
fault gate d uration is the duration of the entire
waveform record.
NOTE. The gating controls interact with the acquisition and frequency domain controls; changing one set
of controls may change the other control settings.
What do you want to do next?
Learn about selecting an FFT window. (see page 906)
Learn about the Math Setup controls. (see page 241)
Learn about the Frequency controls. (see page 247)
Spectral analysis overview
You can use math waveforms to perform FFT (Fast Fourier Transform) measurements with the instrument.
The FFT process m athematically converts the standard time-domain signal (repetitive or single-shot
acquisition) into its frequency components, providing spectral analysis capabilities.
The ability to quickly look at signal frequency components and spectrum shape is a powerful r
esearch and
analysis tool. FFT is an excellent troubleshooting aid for the following:
Testing the impulse response of filters and systems
Measuring harmonic content and d istortion in systems
Identifying and locating noise and interference sources
Analyzing vibration
Analyzing harmonics in 50 and 60 Hz power lines
Spectral analysis features
YoucandisplayanFFTwaveformonanyactivelyacquired signal (periodic or single-shot), the last
acquired signal, or any signal stored in reference memory.
250 DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series
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