Start, Stop, Center, And Span Gate Times; Gating Type - Keysight N9912A User Manual

Start, Stop, Center, and Span Gate Times

These settings specify the time in the trace to be gated (in or out). The gate times
can be specified using either Start and Stop or Center and Span.
 Press
 A settings table appears that allows you to navigate and select the following

Gating Type

This setting defines the type of filtering that will be performed for the gating function.
The gate start and stop flags on the display point toward the part of the trace you
want to keep.
 Choose from the following:
Gating Shape
This setting defines the filter characteristics of the gate function. Choose from
Minimum, Normal, Wide, Maximum.
Time domain Gate Shape setting
Cutoff time is the time between the stop time (-6 dB on the filter skirt) and the peak
of the first sidelobe.
 T
 T
 T
For all filter shapes T
center time.
58
Gating Start/Stop
settings. These settings are made exactly like those made on the Transform
Settings table. Learn how on page 53.
- KEEPS the responses within the Gating Start and Stop times.
Bandpass
o
- REMOVES the responses within the Gating Start and Stop times.
Notch
o
Gate Shape Passband
Ripple
Minimum 0.1 dB
Normal 0.1 dB
Wide 0.1 dB
Maximum 0.01 dB
is the gate span, which is equal to the stop time minus the start time.
1
is the time between the edge of the passband and the 6 dB point, representing
2
the cutoff rate of the filter.
is the time between the 6 dB point and the edge of the gate stopband.
3
is equal to T
2
Sidelobe Cutoff Time
Levels
-48 dB 1.4/Freq Span
-68 dB 2.8/Freq Span
-57 dB 4.4/Freq Span
-70 dB 12.7/Freq Span
, and the filter is the same on both sides of the
3
Minimum Gate
Span
2.8/Freq Span
5.6/Freq Span
8.8/Freq Span
25.4/Freq Span
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