Agilent Technologies Signal Analyzer N9030a - Manual (Page 1204)

6 RLC Swept SA Measurement Front-Panel & SCPI Reference
Sweep/Control
When in zero span, there is no actual sweep performed. But data is only taken while the gate
conditions are satisfied. So even though there is no sweep, the gate settings will impact when
data is acquired.
Key Path Sweep/Control, Gate, Method
Dependencies Key is unavailable when Gate is On and FFT Sweep Type manually selected.
When selected, Sweep Type is forced to Swept and the FFT key in Sweep Type is grayed out.
Readback LO
Initial S/W Revision Prior to A.02.00
Video
When Gate is set to On, the video signal is allowed to pass through whenever the gate conditions
as specified in the Gate menu are satisfied by the signal at the Gate Source.
This form of gating may be thought of as a simple switch, which connects the signal to the input
of the spectrum analyzer. When the gate conditions are satisfied, the switch is closed, and when
the gate conditions are not satisfied, the switch is open. So we only look at the signal while the
gate conditions are satisfied.
With this type of gating, you usually set the analyzer to sweep very slowly. In fact, a general rule
is to sweep slowly enough that the gate is guaranteed to be closed at least once per data
measurement interval (bucket). Then if the peak detector is used, each bucket will represent the
peak signal as it looks with the gate closed.
Key Path Sweep/Control, Gate, Method
Dependencies Key is unavailable when Gate is On and FFT Sweep Type manually selected.
When selected, Sweep Type is forced to Swept and the FFT key in Sweep Type is grayed out
Readback Video
Initial S/W Revision Prior to A.02.00
FFT
When Gate is set to On, an FFT is performed whenever the gate conditions as specified in the
Gate menu are satisfied by the signal at the Gate Source. This is an FFT measurement which
begins when the gate conditions are satisfied. Since the time period of an FFT is approximately
1.83/RBW, you get a measurement that starts under predefined conditions and takes place over a
predefined period. So, in essence, this is a gated measurement. You have limited control over the
gate length but it works in FFT sweeps, which the other two methods do not.
1204 Remote Language Compatibility Measurement Application Reference