Agilent Technologies 8753ET User Manual page 198

Making Time Domain Measurements
Windowing
Table 3-3 Impulse Width, Sidelobe Level, and Windowing Values
Window Type Impulse Sidelobe
Minimum
Normal
Maximum
NOTE: The bandpass mode simulates an impulse stimulus. Bandpass impulse width is twice
that of low pass impulse width. The bandpass impulse sidelobe levels are the same as low pass
impulse sidelobe levels.
Choose one of the three window shapes listed or use the knob to select any windowing
pulse width (or rise time for a step stimulus) between the softkey values. The time domain
stimulus sidelobe levels depend only on the window selected.
MINIMUM
NORMAL
MAXIMUM
USE MEMORY on OFF
A window is activated only for viewing a time domain response, and does not affect a
displayed frequency domain response.
on the time domain response of a short circuit reflection measurement.
3-28
Low Pass Impulse
Level Width (50%)
−13 dB
0.60/Freq Span
−44 dB
0.98/Freq Span
−75 dB
1.39/Freq Span
is essentially no window. Consequently, it gives the
highest sidelobes.
(the preset mode) gives reduced sidelobes and is the mode
most often used.
window gives the minimum sidelobes, providing the
greatest dynamic range.
remembers a user-specified window pulse width (or step
rise time) different from the standard window values.
Figure 3-23
Step Sidelobe
Level
−21 dB
−60 dB
−70 dB
shows the typical effects of windowing
Step Rise Time
(10 − 90%)
0.45/Freq Span
0.99/Freq Span
1.48/Freq Span