Tektronix MDO4000C Series, User Manual

Page: 113 / 160

Window Shape
Rectangular
The frequency resolution when using the Rectangular (a.k.a. boxcar or
none) window is very good, the spectral leakage is high, and amplitude
accuracy is poor.
Use the Rectangular window for measuring transients or bursts where the
signal levels before and after the event are nearly equal. Also, use this
window for equal-amplitude sine waves with frequencies that are very
close together, and for broadband random noise with a relatively slow
varying spectrum. This window is the best type for measuring the
frequency spectrum of non-repetitive signals, and measuring frequency
components near DC.
Hamming
The frequency resolution when using the Hamming window is good
(slightly better than Hanning), the spectral leakage is moderate, and
amplitude accuracy is fair.
Use the Hamming window for measuring sine, periodic, and narrow band
random noise. This window works well on transients or bursts where the
signal levels before and after the event are significantly different.
Hanning
The frequency resolution when using the Hanning (a.k.a. Hann) window
is good, the spectral leakage is low and amplitude accuracy is fair.
Use the Hanning window for measuring sine, periodic, and narrow band
random noise. This window works well on transients or bursts where the
signal levels before and after the event are significantly different.
Blackman-Harris
The frequency resolution when using the Blackman-Harris window is
poor, the spectral leakage is very low and amplitude accuracy is good.
Use the Blackman-Harris window for measuring predominantly single
frequency waveforms to look for higher order harmonics, or several
moderately or widely spaced sinusoidal signals.
Analyze waveform or trace data
MDO4000C Series Oscilloscope User Manual 91
Preliminary