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35 MS6000-EU-EN-V1.3 7/12
4.3.1.6 Magnifying and Positioning FFT Spectrum
The FFT spectrum may be scaled, and the cursors used, to measure through the FFT Zoom option
which enables horizontal magnification. To vertically magnify the spectrum, use the vertical controls.
Horizontal Zoom and Position
The FFT Zoom option (page 2 of FFT option) may be used to magnify the FFT spectrum horizontally
without changing the sample rate. The available zoom factors are X1 (default), X2, X5 and X10. When
the zoom factor is set to X1 and the waveform is located at the center graticule, the left graticule line
position is 0Hz and the right position is the Nyquist frequency.
The FFT spectrum is magnified to the center graticule line when the zoom factor is adjusted. That is, the
axis for horizontal magnification is the center graticule line. Click the Horizontal Position Key to move the
FFT spectrum to the right.
Vertical Zoom and Position
When the FFT spectrum is being displayed, the channel vertical keys become the zoom and position
controls corresponding to their respective channels. The VOLTS key provides the following zoom
factors: X1 (default), X2, X5 and X10. The FFT spectrum is magnified vertically to the marker M (math
waveform reference point on the left edge of the screen). Click the Vertical Position key to move the
spectrum upward.
4.3.1.7 Using Cursors to Measure FFT Spectrum
Cursors may be used to take two measurements on the FFT spectrum: amplitude (in dB) and frequency
(in Hz). Amplitude is referenced to 0db equaling 1VRMS. Use cursors to measure at any zoom factor as
desired.
Push the CURSOR button and if the Type option is OFF select Voltage or Time. Click the Source option
and select Math. Press the Type option button to select between Voltage or Frequency. Click the
SELECT CURSOR option (F3) to choose a cursor, S or E. When highlighted move Cursor S and Cursor
E. Use the horizontal cursor to measure the amplitude and the vertical cursor to measure the
frequency. Now the display at the DELTA menu is just the measured value, and the values at Cursor S
and Cursor E. Delta is the absolute value of Cursor S minus Cursor E.
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