Ceyear 3943B, Руководство по эксплуатации

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4 Operation Guide
4.1 Function operation guide
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Fig. 4.9 Panorama Scan Parameter Setting Interface
Step 3. Press [Start] to start the panoramic scan mode.
4.1.2.2 Window selection
Please refer to 4.1.1.4 for specific operation steps.
4.1.2.3 Parameter Setting
Step 1: Enter the parameter menu. In the panoramic scan mode, touch to activate the corresponding
window and press [Parameter] to enter the parameter setting window. Each window has different
parameter options. See
Chapter 5-Menu for detailed parameter description.
4.1.3 Frequency scan
The frequency scan takes the specified start frequency, stop frequency and step frequency as scan
control data to scan and monitor point by point, and refers to the suppression table during scan. When a
certain receiving frequency is in the suppression table (included in the edge of the suppression table)
during scan, it gives up scan at this point and steps to the next point.
During scan, the data displayed in the RF panorama comes from the level channel, and the IF panorama
data comes from the spectrum channel, which shows the IF spectrum data of the current frequency
point.
At each dwell point, measurement shall be implemented once to judge whether there is a signal (when
the squelch switch is turned on, the amplitude is greater than or equal to the squelch level, it is
considered as a signal. When the squelch switch is turned off, it is considered that there is a signal.
Otherwise, no signal is available), and further processing is performed according to the judgment result.
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If there is no signal, the instrument will step to the next point for measurement.
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If there is a signal, it will stay at this point for demodulation and other processing. The "dwell time"
parameter determines the actual dwell time, and the relationship between dwell time and
measurement time is as follows:

If the dwell time is shorter than or equal to the measurement time, only one measurement is
performed, and this measurement time is the dwell time.

If the dwell time is longer than the measurement time, it is divided into several measurements
according to the multiple of the measurement time, and the time of the last measurement is usually
very short, and the total time of all measurements is equal to the dwell time. For example, if the first
measurement time is 10 seconds and the dwell time is 5s, the total measurement time at the single
frequency point under the frequency scan mode is 15s.