Agilent Technologies DSO-X 4022A, Руководство пользователя

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Math Waveforms
4
Agilent InfiniiVision 4000 X-Series Oscilloscopes User's Guide 99
1 Press the Display Math softkey and turn the Entry knob to select the
math function you want to display. Then, either push the Entry knob or
press the
Display Math
softkey again to display the selected math
function.
2 Press the [Math] key. Then, press the Display Math softkey and select the
math function you want to use. Then, press the
Operator
softkey and
select
FFT
.
•
Source 1
— selects the source for the FFT.
•
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 "To adjust the math waveform scale
and offset" on page 91.
• 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" on
page 91.
• More FFT — displays the More FFT Settings Menu.
3
Press the
More FFT
softkey to display additional FFT settings.