Using the FFT
TDS 340A, TDS 360 & TDS 380 User Manual
3–35
Figure 3–23: Cursor measurement of an FFT waveform
10. Press the main-menu button Function and then the side-menu button Paired.
11. Use the technique just outlined to place the vertical bar of each paired cursor
to the points along the horizontal axis you are interested in.
12. Read the amplitude between the short horizontal bar of the two paired
cursors from the top-most D: readout. Read the amplitude of the short
horizontal bar of the selected (solid) cursor relative to 1 V
RMS
(0 dB) from
the @: readout. Read the frequency between the long horizontal bars of both
paired cursors from the bottom D: readout.
You can also use automated measurements to measure FFT math waveforms.
Use the same procedure as is found under Taking Measurements on page 3–17.
Automated Measurements
of an FFT
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