SPA-900 Series User Manual 43
Table 2-17 Sweep Times
Parameter
Explanation
Default
1
Range
1 ~ 9999
Unit
N/A
Knob Step
1
Direction Key Step
1
2.2.4.4
Sweep Mode
Sweep mode includes auto, sweep and FFT.
1. Auto Mode
When the sweep mode is auto-coupled, the analyzer selects the sweep mode automatically
between Sweep and FFT Mode.
2. Sweep Mode
Work in point-by-point scanning, when RBW is more than 10 Hz.
3. FFT Mode
Work in FFT scans. This FFT mode is only available when RBW is less than 30 kHz.
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 2-18 QPD Dwell Times
Parameter
Explanation
Default
500ms
Range
0s ~ 10s
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.
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