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SIGLENT
34 User Manual
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. For a spectrum analyzer that scans at a single point, each time it tunes to the
corresponding frequency, it only completes the energy detection of the current frequency point.
3. FFT
The FFT mode is only available when RBW is in 1 Hz - 10 kHz. For a spectrum analyzer that performs
scanning in FFT steps, each time it tunes to a certain frequency, it will stay longer, and it also analyzes
all the energy in a frequency band. Therefore. The selected range of FFT step scanning become wider,
but the basic process has not changed fundamentally compared to scaning at a single point. Simply put,
FFT can be regarded as a series of parallel IF filters working at the same time, thus speeding up the
frequency sweep.
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
2.2.5.1 Free Run
The trigger conditions are satisfied at any time and the analyzer generates trigger signals
continuously.
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