Agilent Technologies InfiniiVision 2000 X-Series User Manual page 69

Use the FFT function to find crosstalk problems, to find distortion
problems in analog waveforms caused by amplifier non- linearity, or for
adjusting analog filters.
To display a FFT waveform:
1 Press the [Math] key, press the Function softkey and select f(t), press the
2 Press the More FFT softkey to display additional FFT settings.
Agilent InfiniiVision 2000 X-Series Oscilloscopes User's Guide
Operator softkey and select FFT.
Source 1 — selects the source for the FFT. (See
•
transform function on an arithmetic operation"
information about using g(t) as the source.)
Span — sets the overall width of the FFT spectrum that you see on
•
the display (left to right). Divide span by 10 to calculate the number
of Hertz per division. It is possible to set Span above the maximum
available frequency, in which case the displayed spectrum will not
take up the whole screen. Press the Span softkey, then turn the Entry
knob to set the desired frequency span of the display.
Center — sets the FFT spectrum frequency represented at the center
•
vertical grid line of the display. It is possible to set the Center to
values below half the span or above the maximum available
frequency, in which case the displayed spectrum will not take up the
whole screen. Press the Center softkey, then turn the Entry knob to
set the desired center frequency of the display.
Scale — lets you set your own vertical scale factors for FFT expressed
•
in dB/div (decibels/division). See
and offset" on page 65.
Offset — lets you set your own offset for the FFT. The offset value is
•
in dB and is represented by the center horizontal grid line of the
display. See "To adjust the math waveform scale and offset"
page 65.
More FFT — displays the More FFT Settings Menu.
•
Math Waveforms
"To perform a
on page 64 for
"To adjust the math waveform scale
4
on
69