Agilent Technologies InfiniiVision 3000 X-Series User Manual page 84

4
Math Waveforms
2 Press the More FFT softkey to display additional FFT settings.
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• Scale — lets you set your own vertical scale factors for FFT expressed
in dB/div (decibels/division). See
and offset" on page 75.
• 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 75.
More FFT — displays the More FFT Settings Menu.
•
Window— selects a window to apply to your FFT input signal:
•
Hanning — window for making accurate frequency measurements or
•
for resolving two frequencies that are close together.
Flat Top — window for making accurate amplitude measurements of
•
frequency peaks.
Rectangular — good frequency resolution and amplitude accuracy,
•
but use only where there will be no leakage effects. Use on
self- windowing waveforms such as pseudo- random noise, impulses,
sine bursts, and decaying sinusoids.
Blackman Harris — window reduces time resolution compared to a
•
rectangular window, but improves the capacity to detect smaller
impulses due to lower secondary lobes.
Vertical Units — lets you select Decibels or V RMS as the units for the
•
FFT vertical scale.
Auto Setup — sets the frequency Span and Center to values that will
•
cause the entire available spectrum to be displayed. The maximum
available frequency is half the FFT sample rate, which is a function
of the time per division setting. The FFT resolution is the quotient of
the sampling rate and the number of FFT points (f
FFT Resolution is displayed above the softkeys.
"To adjust the math waveform scale
Agilent InfiniiVision 3000 X-Series Oscilloscopes User's Guide
on
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