Chapter 3 87
Making EDGE (with GSM) Measurements
Making the Spectrum (Frequency Domain) Measurement
FFT Window - Allows you to access the following selection
menu. Unless you are familiar with FFT windows, use the flat top
filter (the default filter).
• Flat Top - Selects a filter for best amplitude accuracy, by
reducing scalloping error.
• Uniform - You can select to have no window active by using
the uniform setting.
• Hanning
• Hamming
• Gaussian - Selects a gaussian filter with an alpha of 3.5.
• Blackman
• Blackman Harris
• K-B 70dB / 90dB/ 110dB (Kaiser-Bessel) - Allows selection
of Kaiser-Bessel filters with sidelobes of −70, −90, or −110 dBc.
FFT Size - This menu contains the following features:
• Length Ctrl - This feature allows you to set the FFT and
window lengths either automatically or manually.
• Min Pts in RBW - This feature allows you to set the
minimum number of data points that will be used inside the
resolution bandwidth. This adjustment is only available if the
Length Ctrl key is set to Auto.
• Window Length - This feature allows you to enter the FFT
window length ranging from 8 to 1048576. This length
represents the actual quantity of I/Q samples that are
captured for processing by the FFT. This value can only be
entered if length control is set to Manual.
• FFT Length - This feature allows you to enter the FFT length
in the number of captured samples, ranging from 4096 to
1048576. The FFT length setting is automatically limited so
that it is equal or greater than the FFT window length setting.
Any amount greater than the window length is implemented
by zero-padding. This value can be entered only if length
control is set to Man (manual).
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