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SIGLENT
SSA3000X User Manual 33
2.2.4.5 QPD Dwell Time
Dwell time is the measurement time at a single frequency. QPD detector gets its weighted envelope
response during dwell time. The longer dwell time is, the more sufficiently QPD detector responses to a
single frequency, the more accuracy the QPD detector envelope is.
Table 2-17 QPD Dwell Times
Parameter
Explanation
Default
50 ms
Range
0 s ~ 10 s
Unit
ks, s, ms, us
Knob Step
N/A
Direction Key Step
N/A
2.2.5 Trigger
The trigger type can be Free Run, Video or External.
1. Free Run
The trigger conditions are satisfied at any time and the analyzer generates trigger signals continuously.
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 in video trigger. At this point, the trigger level line (Trig Line) and value are
displayed on the screen.
Table 2-18 Trigger Setup
Parameter
Explanation
Default
0 dBm
Range
-300 dBm ~ 50 dBm
Unit
dBm
Knob Step
1 dB
Direction Key Step
10 dB
3. External
In this mode, an external signal (TTL signal) is input from the [TRIGGER IN] connector at the rear panel
and trigger signals are generated when this signal fulfills the specified trigger edge condition.
Set the trigger edge in external trigger to the rising (Pos) or falling (Neg) edge of the pulse.
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