Frequency and Time Domain Analysis 6
U8903A User’s Guide 109
Window
The available window functions are Rectangular, Hann,
Hamming, Blackman- Harris, Rife- Vincent 1 and 3, and
Flattop. These windows are only applicable in the frequency
domain and will not affect the time domain analysis.
•Rectangular
Also called a Uniform window, the Rectangular window
is actually no window at all. This window provides
good frequency resolution and amplitude accuracy and
is best for measuring transient signals rather than
continuous signals, for example, pseudorandom noise,
impulses, sine bursts, and decaying sinusoids.
•Hann
This window is used for making accurate frequency
measurements especially when trying to resolve two
frequency components that are close together. The
Hann window has the best overall filter characteristic
and is a good general purpose window for most signal
analyses.
• Hamming
This window provides better frequency resolution but
less amplitude accuracy compared to the Rectangular
window. The Hamming window has a slightly better
frequency resolution than the Hann window, and is
suitable for measuring sine, periodic, and asymmetric
transients or bursts.
•Blackman-Harris
This window provides the best amplitude resolution,
but less frequency resolution compared to the
Rectangular, Hann, and Hamming windows. This
window is normally used for measuring higher order
harmonics of single frequency signals.
• Rife- Vincent 1 and 3
These windows have smooth, monotonically- falling
responses with no sidelobes.
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