Tektronix Defining Spectral Math Waveforms

Creating and Using Math Waveforms
3- 202 CSA7000 Series, TDS7000 Series, & TDS6000 Series Instruments User Manual
Defining Spectral Math Waveforms
The math capabilities of the instrument include spectrum analysis of a wave-
form. This section describes a spectral analyzer that allows you to control the
analysis intuitively with time domain and frequency domain controls. These
controls merge the time domain controls with the frequency domain controls to
provide a complete spectral analyzer.
Signals may be represented by their characteristics in both the time and the
frequency domain. By combining and transforming source waveforms into
spectral math waveforms, you can simultaneously view signal characteristics in
both domains.
This spectral analyzer provides a complete set of controls and features that allow
you to make time and frequency domain measurements without the need to learn
extensive details about FFT algorithms.
HFrequency Domain Controls: You can operate the spectral analyzer using
traditional spectrum analyzer controls. You can set the center frequency,
span, and resolution bandwidth directly.
HTime Domain Controls: The spectral analyzer has time domain controls for
the acquired waveform. These controls set the time duration and the
resolution time between samples. You can easily set the required sample rate
and record length.
HGating Controls: These controls are the bridge that connect the time domain
to the frequency domain. You can perform spectral analysis on a gated region
of the input waveform. This gating also determines the resolution bandwidth
of the analyzer.
HWindow Functions: There are eight different window functions that shape
the filter response of the spectral analyzer.
HMagnitude Versus Frequency: You can choose to display data in dB or
linear mode. You may display the real or imaginary parts of the spectral
magnitude only. Ref level offset and reference level controls give complete
control over the vertical position and offset of the spectrum. The log zero dB
ref level may be dialed in manually or set to dBm with a single button touch.