Tektronix TDS 200-Series Instructions

TDS2MM Measurement Module
32
TDS 200-Series Extension Module Instructions
Nyquist Frequency
The highest frequency that any real-time digitizing oscilloscope can
measure without errors is one-half the sample rate. This frequency is
called the Nyquist frequency. Frequency information above the
Nyquist frequency is undersampled, causing a situation known as
aliasing (refer to Aliasing on page 38).
The TDS2MM Module transforms the center 2048 points of the
time-domain waveform into an FFT waveform. The resulting FFT
waveform contains 1024 points that go from DC (0 Hz) to the
Nyquist frequency.
Normally, the display compresses the FFT waveform horizontally
into 250 points, but you can use the FFT Zoom function to expand
the FFT waveform to more clearly see the frequency components at
each of the 1024 data points in the FFT waveform.
NOTE. The oscilloscope bandwidth rolls off slowly above 20 MHz
(Bandwidth Limit ON), 60 MHz (TDS 210), or 100 MHz (TDS 220).
Therefore, the FFT waveform can show valid frequency information
higher than the oscilloscope bandwidth. However, the magnitude
information above the bandwidth will not be accurate.

Tektronix TDS 200-Series Specifications

General

Brand	Tektronix
Model	TDS 200-Series
Category	Test Equipment
Language	English