
228
6000 Series Oscilloscope User’s Guide
5
Making Measurements
Figure 32
FFT measurements
FFT Measurement Hints
The number of points acquired for the FFT record is 1000
and
when frequency span is at maximum, all points are displayed.
Once the FFT spectrum is displayed, the frequency span and
center frequency controls are used much like the controls of a
spectrum analyzer to examine the frequency of interest in
greater detail. Place the desired part of the waveform at the
center of the screen and decrease frequency span to increase
the display resolution. As frequency span is decreased, the
number of points shown is reduced, and the display is
magnified.
While the FFT spectrum is displayed, use the
Math
and
Cursors
keys to switch between measurement functions and frequency
domain controls in FFT menu.
Decreasing the effective sampling rate by selecting a slower
sweep speed will increase the low frequency resolution of the
FFT display and also increase the chance that an alias will be
displayed. The resolution of the FFT is the effective sample rate
divided by the number of points in the FFT. The actual
resolution of the display will not be this fine as the shape of the
window will be the actual limiting factor in the FFTs ability to
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Страница 60: ...60 6000 Series Oscilloscope User s Guide 1 Getting Started ...
Страница 126: ...126 6000 Series Oscilloscope User s Guide 3 Viewing and Measuring Digital Signals ...
Страница 292: ...292 6000 Series Oscilloscope User s Guide 6 Displaying Data Interpreting Decoded LIN Data ...
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Страница 354: ...354 6000 Series Oscilloscope User s Guide 8 Reference ...
Страница 362: ...362 6000 Series Oscilloscope User s Guide 9 ...