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Then reduce the resolution bandwidth to spread out the lobe horizontally. You can then select
different window functions and observe their shape.
Window Attributes
In the time domain, windows are typically bell shaped and go to zero at the ends of the record.
For cases where you may be doing impulse response testing, the impulse should be centered
at the zero phase reference point (for most windows, this is the 50% position of the gate and
20% for the Tek Exponential window).
Different window functions affect the resolution bandwidth of the spectral analyzer.
Various window shapes affect the scallop loss.
The shape of the frequency domain lobe is determined by the window function. Some
windows have better resolution bandwidth, but they do so at the expense of side lobe
attenuation and energy leakage into adjacent bins. For example, a rectangular window
typically spills energy into many bins showing signals that don’t exist; but it has the best
frequency resolution. If you are using a window where leakage is occurring, you may want to
use spectral gating to reduce the amplitude errors when measuring a given frequency.
Text Edit Controls
Use the following controls to edit the Math expression.
Moves the text insertion point to the
left of the first character in the
expression.
Moves the text insertion point one
character to the left.
Moves the text insertion point one
character to the right.
Deletes the character to the left of the
insertion point.
Clears the entire math expression.
Summary of Contents for TDS5000B Series
Page 36: ...36 AFTDS Differential Signal Adapter...
Page 280: ...280 Blackman Harris window...
