Operating Basics
TDS3FFT FFT Application Module User Manual
15
Eliminating Aliases
Use the following methods to eliminate aliases:
H
Increase the sample rate by adjusting the Horizontal SCALE to a
faster frequency setting. Since you increase the Nyquist
frequency as you increase the frequency, the aliased frequency
components should appear at their proper frequency. If the
increased number of frequency components shown on the screen
makes it difficult to measure individual components, use the
Zoom button to magnify the FFT waveform.
H
Use a filter on the source signal to bandwidth limit the signal to
frequencies below that of the Nyquist frequency. If the frequency
components you want to view are below the built-in bandwidth
settings (20 MHz bandwidth for all oscilloscopes, 150 MHz
bandwidth for 300 MHz and 500 MHz oscilloscopes), set the
source channel bandwidth to the appropriate value. Push the
Vertical MENU button to access the channel bandwidth menu.
Operating Basics
TDS3FFT FFT Application Module User Manual
15
Eliminating Aliases
Use the following methods to eliminate aliases:
H
Increase the sample rate by adjusting the Horizontal SCALE to a
faster frequency setting. Since you increase the Nyquist
frequency as you increase the frequency, the aliased frequency
components should appear at their proper frequency. If
the
increased number of frequency components shown on the screen
makes it difficult to measure individual components, use the
Zoom button to magnify the FFT waveform.
H
Use a filter on the source signal to bandwidth limit the signal to
frequencies below that of the Nyquist frequency. If the frequency
components you want to view are below the built-in bandwidth
settings (20 MHz bandwidth for all oscilloscopes, 150 MHz
bandwidth for 300 MHz and 500 MHz oscilloscopes), set the
source channel bandwidth to the appropriate value. Push the
V ertical MENU button to access the channel bandwidth menu.
