HP 54540 Series - Making FFT Measurements

Math/FFT Menu
Making FFT Measurements
Frequency Measurements
For best frequency accuracy on peaks:
Turn on magnify.
Jse the Hanning window.
Set the frequency span so that the signal of interest is in the upper part of
the screen (not down at dc).
Set both the record length and the number of points to 32,768, or as high
as possible if computation time is a consideration. (The greater the record
length, the longer the computation time.)
The frequency accuracy is the sum of two terms. The first term is supplied
because there are a limited number of frequency bins. The measurement is
accurate to plus or minus half a bin. The second term is related to the
accuracy of the internal oscillator which generates the sample clock.
frequency resolution
accuracy =+ a (signal frequencyx0.005% )
8 le frequenc : “
=+/—89
+(s
z
syx0.005%
2x number of points ) Aigiea requ m
_4{ frequency span
7 9
= er of pot =u (signal frequencyx0.005%)
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