Tektronix TPS2012B, User Manual

Page: 90 / 184

Math FFT
Displaying the FFT Spectrum
Push the Math button to display the Math Menu. Use the options to select the
Source channel, Window algorithm, and FFT Zoom factor. You can display only
one FFT spectrum at a time.
Math FFT option Settings Comments
Source Channel 1, 2, 3 1 , 4 1 Selects the channel used as the FFT source
Window Hanning, Flattop, Rectangular Selects the FFT window type; (See page 65, Selecting
an FFT Window .)
FFT Zoom X1, X2, X5, X10 Changes the horizontal magni fi cation of the FFT display;
(See page 68, Magnifying and Positioning an FFT
Spectrum .)
1 Available only on a 4-channel oscilloscope.
Fundamental
frequency
component
Frequency
component
1. Frequency at the center graticule line.
2. Vertical scale in dB per division (0 dB = 1 V
RMS
).
3. Horizontal scale in frequency per division.
4. Sample rate in number of samples per second.
5. FFT window type.
64 TPS2000B Series Digital Oscilloscope User Manual