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b)
Set the span
Press
【
Freq
】
→[Span]. Please note if the span is shown in the active function area in order to confirm currently
activated parameter. To reduce the span to, for example, 10MHz, you can input [1] [0] using the numerical keypad
and select the unit as [MHz], or you can use
【
↓
】
key to reduce to this value by step (the numerical keys and
step keys can be used for changing the value of current parameter). The result is shown in Fig. 3.2. Attention
should be paid to check if the resolution bandwidth and the video bandwidth are adaptable to the span as they will
be automatically adjusted to a proper value based on the given span value. The sweep time is also adaptable.
Fig. 3.2 Center Frequency of 1GHz and Span of 10MHz
c)
Set the sweep time
Press
【
Sweep
】
key and select [Sweep Time Auto Man] soft key. The soft key can be used to set auto or manual
control of the sweep time, and the currently active option is underlined. For example, when “Auto” is underlined,
the sweep time will be automatically adaptable to other relevant parameter settings.
d)
Activate the marker
By pressing
【
Marker
】
, common marker will be activated and displayed in the center of the horizontal coordinates
(the frequency and amplitude will be read by the marker and shown in the active function area). The marker reads
the frequency as 1GHz and amplitude as -20dBm, as shown in Fig. 3.3.
If the marker is not at the peak, you can press
【
Peak
】
key to enable the marker to automatically jump to the peak
of the signal or use the knob on the front panel to manually position the marker on the maximum value of the
signal.
