TDS2MM Measurement Module
38
TDS 200-Series Extension Module Instructions
Aliasing
Problems occur when the oscilloscope acquires a time-domain
waveform containing frequency components that are greater than the
Nyquist frequency (refer to Nyquist Frequency on page 32). The
frequency components that are above the Nyquist frequency are
undersampled, appearing as lower frequency components that “fold
back” around the Nyquist frequency. These incorrect components are
called aliases.
Nyquist frequency
(one-half sample rate)
Frequency
Amplitude
Aliased frequencies Actual frequencies