Keysight N9923A FieldFox User Manual page 43

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.
Minimum gate span is twice the cutoff time. Each gate shape has a minimum
recommended gate span for proper operation. This is a consequence of the finite
cutoff rate of the gate. If you specify a gate span that is smaller than the minimum
span, the response will show the following effects:
 distorted gate shape that has no passband
 distorted shape
 incorrect indications of start and stop times
 may have increased sidelobe levels.
Time Domain - Option 010
- 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
43