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SSA3000X Plus User Manual 37
2.2.4.4
Sweep Mode
Sweep mode includes auto mode, sweep mode and FFT mode.
1. Auto
When the sweep mode is auto, the analyzer selects the sweep mode automatically between Sweep
and FFT Mode in the shortest time.
2. Sweep
True swept operation including point-by-point scanning. The Sweep mode is available when the RBW
is in 30 Hz
– 1 MHz.
3. FFT
The FFT mode is only available when RBW is in 1 Hz - 10 kHz.
When the tracking generator (TG) is on, the sweep mode is forced to Sweep.
2.2.4.5
QPD Dwell Time
Dwell time is the measurement time at a single frequency. QP detector gets its weighted envelope
response during this dwell time. The longer dwell time is, the more sufficiently the QP detector
responses to a single frequency, and the more accurate the QP detector envelope is.
Table 2-19 QPD Dwell Times
Parameter
Explanation
Default
50 ms
Range
0 s ~ 10 s
Unit
ks, s, ms, us
Knob Step
1 ms
Direction Key Step
1 ms
2.2.5 Trigger
The trigger type can be Free Run, Video or External.
2.2.5.1
Free Run
The trigger conditions are satisfied at any time and the analyzer generates trigger signals continuously.
2.2.5.2
Video Trigger
A trigger signal will be generated when the system detects a video signal of which the voltage exceeds
the specified video trigger level.
Set the trigger level with the video trigger menu entry. At this point, the trigger level line (Trig Line) and
