Math FFT
TDS1000/2000-Series Digital Oscilloscope User Manual 125
When you change the zoom factor, the FFT spectrum is magnified
about the center graticul e line. In other words, the axis of horizontal
magnification is the centergraticule line.
Turn the HORIZONTAL POSITIONknob cl ockwise to move the
FFT spectrum to the right. Push the SET TO ZERO button to
position the center of the spectrumat the center of the graticule.
Vertical Zoom and Position
The channel vertical knobs become zoom and position controls for
their respective channels when displa ying the FFT spectrum. The
VOLTS/DIVknob provides zoom factors of X0.5, X1 (default), X2,
X5, and X10. The FFT spectrum is vertically m agnified about the
M marker (math waveform reference point on the left edge of the
screen).
Turn the VERTICAL POSITION knob clockwise to move the
spectrum up.