FFT
Measuring an FFT Spectrum Using Cursors
You can take two measurements on FFT spectrums: magnitude (in dB), and
frequency (in Hz). Magnitude is referenced to 0 dB, where 0 dB equals 1 V
RMS
.
You can use the cursors to take measurements at any zoom factor. To do so,
follow these steps:
1.
Push the
Cursor
button to see the cursor side menu.
2.
Push
Source
►
FFT
.
3.
Push the
Type
option button and use the
Multipurpose
knob to select
Magnitude
or
Frequency
.
4.
Select
Cursor 1
or
Cursor 2
.
5.
Use the
Multipurpose
knob to move the selected cursor.
Use horizontal cursors to measure magnitude and vertical cursors to measure
frequency. The options display the delta between the two cursors, the value at
cursor 1 position, and the value at cursor 2 position. Delta is the absolute value of
cursor 1 minus cursor 2.
Magnitude cursors
Frequency cursors
You can also take a frequency measurement without using the cursors. To do so,
turn the
Horizontal Position
knob to position a frequency component on the
center graticule line and read the frequency at the top right of the display.
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