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SIGLENT
SSA3000X User Manual 31
detected are weighted using circuit with specified charge and discharge structures as well as the
display time constant specified in the CISPR 16 standards.
The measurement time for QPD is far longer than Peak Detector.
2.2.4 Sweep
Set parameters about the Sweep functions, including sweep time, sweep rule, sweep mode, number of
sweep, etc.
2.2.4.1 Sweep Time
Set the time needed for the spectrum analyzer to finish a sweep within the span range. The sweep time
can be set in “Auto” or “Manual” mode and the default is “Auto”.
◆ In non-zero span, the analyzer selects the shortest sweep time on the basis of the current RBW
and VBW settings if Auto is selected.
◆ Decreasing the sweep time would speed the measurement. However, an error may be caused if
the specified sweep time is less than the minimum sweep time in Auto coupling; at this point,
“UNCAL” is shown in the status bar on the screen
Table 2-15 Sweep Time
Parameter
Explanation
Default
N/A
Range
900 us ~ 3 ks（Quasi Peak：900 us ~ 30 ks）
Unit
ks, s, ms, us
Knob Step
Sweep time/100, min =1 ms
Direction Key Step
in 1,3 sequence
2.2.4.2 Sweep Rule
The analyzer provides two sweep time rules to meet the different sweep time requirements:
Speed: Activates the default fast sweep time rule.
Accuracy: Activates the normal sweep time rule to ensure the measurement accuracy. Speed sweep
time rule provides a fast measurement function that decreases the sweep time. Using Fast Sweep will
decrease the measurement accuracy.
2.2.4.3 Sweep
Set sweep mode in single or continuous, the default is continuous. The corresponding icon of the
sweep will be displayed in the status bar at the left of the screen.
1. Single
Set the sweep mode to “Single”. The number on the parameter icon denotes the current sweep
number.
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