12-4 824 Reference Manual 9/29/09
Avg Count
The 824 FFT is guaranteed to have
no more than 75% overlap.
The average count is the number of FFTs taken and averaged
together.
• 1 to 16384
FFT Repeat
Once the average count is completed you can choose to
continue repeating the FFT or have the FFT stop.
• No - Stops the count when the average count has been
reached.
• Yes - Repeats the count continuously.
Window
The Hanning window is typically
used for most measurements.
The time weighting window can be the following:
• Rectangular; provides finest frequency resolution.
• Hanning; good compromise between amplitude accuracy
and frequency resolution. Most commonly used for
general measurements.
• Flat-top; provides best amplitude accuracy. Often used
for calibration.
The Rectangular window provides the best frequency
discrimination but can have significant filter leakage or
effects of a truncated series. The Hanning window
minimizes the filter leakage with the cost of a wider main
lobe. The Flat-top window gives better amplitude accuracy
in the passband.
Overload Skip
Overload skip allows you to throw away or keep spectra that
contain overloaded data.
• No - Averages in spectra with overload data.
• Yes - Does not average spectra in that contains
overloaded data.
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