Tektronix CSA7404B, User Manual

Page: 280 / 438

Creating and Using Math Waveforms
3- 212
CSA7000B Series & TDS7000B Series Instruments User Manual
Overview Related control elements and resources To define a spectral math waveform (Cont.)
Set the
frequency
domain controls
The spectral analyzer center frequency and the frequency
span must be within the bandwidth setting determined by the
sample rate.
See Figure 3--49 on page 3--187 to see how a signal
consisting of two sine waves looks on screen as the spectral
analyzer controls are adjusted. A rectangular window was
used.
20. To set the frequency range over which the spectral
analysis is performed, touch Freq Span, and use the
multipurpose knobs or keypad to set the frequency
range.
Higher sample rates allow you to set greater frequency
spans. To set the frequency span to the maximum
allowed by the current sample rate, touch the Full
button.
21. To set the center frequency of the spectral analysis,
touch Center Freq and use the multipurpose knobs or
keypad to set the center frequency.
Resolution bandwidth determines how small of a frequency
difference may be resolved in the frequency domain output
data. It basically defines the bandwidth of the filters used to
do the frequency domain analysis.
22. To set the resolution bandwidth, touch Res BW, and use
the multipurpose knobs or keypad to set the resolution
bandwidth.